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• Should we remove Child added by addChild method before going to next scene in cocos2d ?

  - by srikanth rongali

  Hi, I am writing a small game in cocos2d. I am adding child [ self addChild: sprite1]; Should I remove these before going to next scene by using [self removeChild: sprite1 cleanup:YES]; Does it increase the performance in device ? Thank You.

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• From a Maya scene to a WebGL animation, where to start?

  - by Tower

  Hi, I've got some time, and I really would like to learn to get my Maya animated scenes into WebGL. I'm not sure where to start really. It would be amazing if I could make a Canvas element and place a Maya scene into it so that it's animating. Does anyone got a tutorial or some hints? PS. Answers about 3ds Max are also welcome!

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• Can I divide a scene into two layers of equal sizes ?

  - by srikanth rongali

  I need to divide a scene in to two layers. So that I can write same methods for two layers. So I may get two functionalities. But can I make that ? Is there a possibility in cocos2d? Thank You

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• map with string is broken?[solved]

  - by teritriano

  Yes. I can't see what im doing wrong the map is string, int Here the method bange::function::Add(lua_State *vm){ //userdata, function if (!lua_isfunction(vm, 2)){ cout << "bange: AddFunction: First argument isn't a function." << endl; return false;} void *pfunction = const_cast<void *>(lua_topointer(vm, 2)); char key[32] = {0}; snprintf(key, 32, "%p", pfunction); cout << "Key: " << key << endl; string strkey = key; if (this->functions.find(strkey) != this->functions.end()){ luaL_unref(vm, LUA_REGISTRYINDEX, this->functions[strkey]);} this->functions[strkey] = luaL_ref(vm, LUA_REGISTRYINDEX); return true; Ok, when the code is executed... Program received signal SIGSEGV, Segmentation fault. 0x00007ffff6e6caa9 in std::basic_string<char, std::char_traits<char>, std::allocator<char> > ::compare(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const () from /usr/lib/libstdc++.so.6 Seriously, what's wrong with my code. Thanks for help. Edit 1: Ok, I've done the solution and still fails. I've tried directly insert a string but gives the same error. Let's see, the object is a bange::scene inherited from bange::function. I create the object with lua_newuserdata: bange::scene *scene = static_cast<bange::scene *>(lua_newuserdata(vm, sizeof(bange::scene))); (...) scene = new (scene) bange::scene(width, height, nlayers, vm); I need this for LUA garbage collection. Now the access to bange::function::Add from Lua: static int bangefunction_Add(lua_State *vm){ //userdata, function bange::function *function = reinterpret_cast<bange::function *>(lua_touserdata(vm, 1)); cout &lt&lt "object with bange::function: " &lt&lt function << endl; bool added = function->bange::function::Add(vm); lua_pushboolean(vm, static_cast<int>(added)); return 1; } Userdata is bange::scene stored in Lua. Knowing that userdata is scene, in fact, the object's direction is the same when I've created the scene before. I need the reinterpret_cast, and then call the method. The pointer "this" is still the same direction inside the method. solved I did a small test in the bange::function constructor which works without problems. bange::function::function(){ string test("test"); this->functions["test"] = 2; } I finally noticed that the problem is bange::function *function = reinterpret_cast<bange::function *>(lua_touserdata(vm, 1)); because the object is bange::scene and no bange::function (i admit it, a pointer corruption) and this seems more a code design issue. So this, in a way, is solved. Thanks everybody.

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• Cocos2d-x v3 invalid conversion from 'cocos2d::Layer* [on hold]

  - by Hammerh5

  Hello guys I'm learning cocos2d-x v3 right but most of the code that I can find is to the version 2. My specific error is this one, when I try to compile my cocos2s-x 3 project this error shows. invalid conversion from 'cocos2d::Layer to Game* [-fpermisive]* What I want to do is create a new game scene in the following code: //Game.cpp #include "Game.h" Scene* Game::scene() { scene *sc = CCScene::create(); sc->setTag(TAG_GAME_SCENE); const Game *g = Game::create(); //Here is where the conversions fails. sc->addChild(g, 0, TAG_GAME_LAYER); return sc; } Of course this is my header file //Game.h #include "cocos2d.h" #include "Mole.h" #include "AppDelegate.h" using namespace cocos2d; class Game: public cocos2d::Layer { cocos2d::CCArray *moles; float timeBetweenMoles, timeElapsed, increaseMolesAtTime, increaseElapsed, lastMoleHiTime; int molesAtOnce; cocos2d::CCSize s; bool isPaused; public: CCString *missSound, *hitSound; static cocos2d::Scene* scene(); virtual bool init(); void showMole(); void initializeGame(); void onEnterTransitionDidFinish(); void onExit(); void onTouchesBegan(const std::vector<cocos2d::Touch *> &touches, cocos2d::Event *event); void tick(float dt); cocos2d::CCArray* getMoles(bool isUp); //LAYER_CREATE_FUNC(Game); }; #endif /* GAME_H_ */ I don't know what's wrong I suppose this code works fine in Cocos2d-x v2. It's maybe some changes in the C++ version ?

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• Thread safe double buffering

  - by kdavis8

  I am trying to implement a draw map method that will draw the tiled image across the surface of the component. I'm having issue with this code. The double buffering does not seem to be working, because the sprite flickers like crazy; my source code: package myPackage; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Toolkit; import java.awt.image.BufferStrategy; import java.awt.image.BufferedImage; import javax.swing.JFrame; public class GameView extends JFrame implements Runnable { public BufferedImage backbuffer; public Graphics2D g2d; public Image img; Thread gameloop; Scene scene; public GameView() { super("Game View"); setSize(600, 600); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); backbuffer = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB); g2d = backbuffer.createGraphics(); Toolkit tk = Toolkit.getDefaultToolkit(); img = tk.getImage(this.getClass().getResource("cage.png")); scene = new Scene(g2d, this); gameloop = new Thread(this); gameloop.start(); } public static void main(String args[]) { new GameView(); } public void paint(Graphics g) { g.drawImage(backbuffer, 0, 0, this); repaint(); } @Override public void run() { // TODO Auto-generated method stub Thread t = Thread.currentThread(); while (t == gameloop) { scene.getScene("dirtmap"); g2d.drawImage(img, 80, 80,this![enter image description here][1]); } } private void drawScene(String string) { // TODO Auto-generated method stub // g2d.setColor(Color.white); // g2d.fillRect(0, 0, getWidth(), getHeight()); scene.getScene(string); } } package myPackage; import java.awt.Color; import java.awt.Component; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Toolkit; public class Scene { Graphics g2d; Component c; boolean loaded = false; public Scene(Graphics2D gr, Component co) { g2d = gr; c = co; } public void getScene(String mapName) { Toolkit tk = Toolkit.getDefaultToolkit(); Image tile = tk.getImage(this.getClass().getResource("dirt.png")); // g2d.setColor(Color.red); for (int y = 0; y <= 18; y++) { for (int x = 0; x <= 18; x += 1) { g2d.drawImage(tile, x * 32, y * 32, c); } } loaded = true; } }

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• Pointers to Derived Class Objects Losing vfptr

  - by duckworthd

  To begin, I am trying to write a run-of-the-mill, simple Ray Tracer. In my Ray Tracer, I have multiple types of geometries in the world, all derived from a base class called "SceneObject". I've included the header for it here. /** Interface for all objects that will appear in a scene */ class SceneObject { public: mat4 M, M_inv; Color c; SceneObject(); ~SceneObject(); /** The transformation matrix to be applied to all points of this object. Identity leaves the object in world frame. */ void setMatrix(mat4 M); void setMatrix(MatrixStack mStack); void getMatrix(mat4& M); /** The color of the object */ void setColor(Color c); void getColor(Color& c); /** Alter one portion of the color, leaving the rest as they were. */ void setDiffuse(vec3 rgb); void setSpecular(vec3 rgb); void setEmission(vec3 rgb); void setAmbient(vec3 rgb); void setShininess(double s); /** Fills 'inter' with information regarding an intersection between this object and 'ray'. Ray should be in world frame. */ virtual void intersect(Intersection& inter, Ray ray) = 0; /** Returns a copy of this SceneObject */ virtual SceneObject* clone() = 0; /** Print information regarding this SceneObject for debugging */ virtual void print() = 0; }; As you can see, I've included a couple virtual functions to be implemented elsewhere. In this case, I have only two derived class -- Sphere and Triangle, both of which implement the missing member functions. Finally, I have a Parser class, which is full of static methods that do the actual "Ray Tracing" part. Here's a couple snippets for relevant portions void Parser::trace(Camera cam, Scene scene, string outputFile, int maxDepth) { int width = cam.getNumXPixels(); int height = cam.getNumYPixels(); vector<vector<vec3>> colors; colors.clear(); for (int i = 0; i< width; i++) { vector<vec3> ys; for (int j = 0; j<height; j++) { Intersection intrsct; Ray ray; cam.getRay(ray, i, j); vec3 color; printf("Obtaining color for Ray[%d,%d]\n", i,j); getColor(color, scene, ray, maxDepth); ys.push_back(color); } colors.push_back(ys); } printImage(colors, width, height, outputFile); } void Parser::getColor(vec3& color, Scene scene, Ray ray, int numBounces) { Intersection inter; scene.intersect(inter,ray); if(inter.isIntersecting()){ Color c; inter.getColor(c); c.getAmbient(color); } else { color = vec3(0,0,0); } } Right now, I've forgone the true Ray Tracing part and instead simply return the color of the first object hit, if any. As you have no doubt noticed, the only way the computer knows that a ray has intersected an object is through Scene.intersect(), which I also include. void Scene::intersect(Intersection& i, Ray r) { Intersection result; result.setDistance(numeric_limits<double>::infinity()); result.setIsIntersecting(false); double oldDist; result.getDistance(oldDist); /* Cycle through all objects, making result the closest one */ for(int ind=0; ind<objects.size(); ind++){ SceneObject* thisObj = objects[ind]; Intersection betterIntersect; thisObj->intersect(betterIntersect, r); double newDist; betterIntersect.getDistance(newDist); if (newDist < oldDist){ result = betterIntersect; oldDist = newDist; } } i = result; } Alright, now for the problem. I begin by creating a scene and filling it with objects outside of the Parser::trace() method. Now for some odd reason, I cast Ray for i=j=0 and everything works wonderfully. However, by the time the second ray is cast all of the objects stored in my Scene no longer recognize their vfptr's! I stepped through the code with a debugger and found that the information to all the vfptr's are lost somewhere between the end of getColor() and the continuation of the loop. However, if I change the arguments of getColor() to use a Scene& instead of a Scene, then no loss occurs. What crazy voodoo is this?

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• What is the best strategy for populating a TableView from a service?

  - by alrutherford

  I have an application which has a potentially long running background process. I want this process to populate a TableView as results objects are generated. The results objects are added to an observableList and have properties which are bound to the columns in the usual fashion for JavaFX. As an example of this consider the following sample code Main Application import java.util.LinkedList; import javafx.application.Application; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.geometry.Insets; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.TableColumn; import javafx.scene.control.TableView; import javafx.scene.control.cell.PropertyValueFactory; import javafx.scene.layout.VBox; import javafx.stage.Stage; public class DataViewTest extends Application { private TableView<ServiceResult> dataTable = new TableView<ServiceResult>(); private ObservableList<ServiceResult> observableList; private ResultService resultService; public static void main(String[] args) { launch(args); } @Override public void start(Stage stage) { observableList = FXCollections.observableArrayList(new LinkedList<ServiceResult>()); resultService = new ResultService(observableList); Button refreshBtn = new Button("Update"); refreshBtn.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent arg0) { observableList.clear(); resultService.reset(); resultService.start(); } }); TableColumn<ServiceResult, String> nameCol = new TableColumn<ServiceResult, String>("Value"); nameCol.setCellValueFactory(new PropertyValueFactory<ServiceResult, String>("value")); nameCol.setPrefWidth(200); dataTable.getColumns().setAll(nameCol); // productTable.getItems().addAll(products); dataTable.setItems(observableList); Scene scene = new Scene(new Group()); stage.setTitle("Table View Sample"); stage.setWidth(300); stage.setHeight(500); final VBox vbox = new VBox(); vbox.setSpacing(5); vbox.setPadding(new Insets(10, 0, 0, 10)); vbox.getChildren().addAll(refreshBtn, dataTable); ((Group) scene.getRoot()).getChildren().addAll(vbox); stage.setScene(scene); stage.show(); } } Service public class ResultService extends Service<Void> { public static final int ITEM_COUNT = 100; private ObservableList<ServiceResult> observableList; /** * Construct service. * */ public ResultService(ObservableList<ServiceResult> observableList) { this.observableList = observableList; } @Override protected Task<Void> createTask() { return new Task<Void>() { @Override protected Void call() throws Exception { process(); return null; } }; } public void process() { for (int i = 0; i < ITEM_COUNT; i++) { observableList.add(new ServiceResult(i)); } } } Data public class ServiceResult { private IntegerProperty valueProperty; /** * Construct property object. * */ public ServiceResult(int value) { valueProperty = new SimpleIntegerProperty(); setValue(value); } public int getValue() { return valueProperty.get(); } public void setValue(int value) { this.valueProperty.set(value); } public IntegerProperty valueProperty() { return valueProperty; } } Both the service and the TableView share a reference to the observable list? Is this good practise in JavaFx and if not what is the correct strategy? If you hit the the 'Update' button the list will not always refresh to the ITEM_COUNT length. I believe this is because the observableList.clear() is interfering with the update which is running in the background thread. Can anyone shed some light on this?

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• Basic shadow mapping fails on NVIDIA card?

  - by James

  Recently I switched from an AMD Radeon HD 6870 card to an (MSI) NVIDIA GTX 670 for performance reasons. I found however that my implementation of shadow mapping in all my applications failed. In a very simple shadow POC project the problem appears to be that the scene being drawn never results in a draw to the depth map and as a result the entire depth map is just infinity, 1.0 (Reading directly from the depth component after draw (glReadPixels) shows every pixel is infinity (1.0), replacing the depth comparison in the shader with a comparison of the depth from the shadow map with 1.0 shadows the entire scene, and writing random values to the depth map and then not calling glClear(GL_DEPTH_BUFFER_BIT) results in a random noisy pattern on the scene elements - from which we can infer that the uploading of the depth texture and comparison within the shader are functioning perfectly.) Since the problem appears almost certainly to be in the depth render, this is the code for that: const int s_res = 1024; GLuint shadowMap_tex; GLuint shadowMap_prog; GLint sm_attr_coord3d; GLint sm_uniform_mvp; GLuint fbo_handle; GLuint renderBuffer; bool isMappingShad = false; //The scene consists of a plane with box above it GLfloat scene[] = { -10.0, 0.0, -10.0, 0.5, 0.0, 10.0, 0.0, -10.0, 1.0, 0.0, 10.0, 0.0, 10.0, 1.0, 0.5, -10.0, 0.0, -10.0, 0.5, 0.0, -10.0, 0.0, 10.0, 0.5, 0.5, 10.0, 0.0, 10.0, 1.0, 0.5, ... }; //Initialize the stuff used by the shadow map generator int initShadowMap() { //Initialize the shadowMap shader program if (create_program("shadow.v.glsl", "shadow.f.glsl", shadowMap_prog) != 1) return -1; const char* attribute_name = "coord3d"; sm_attr_coord3d = glGetAttribLocation(shadowMap_prog, attribute_name); if (sm_attr_coord3d == -1) { fprintf(stderr, "Could not bind attribute %s\n", attribute_name); return 0; } const char* uniform_name = "mvp"; sm_uniform_mvp = glGetUniformLocation(shadowMap_prog, uniform_name); if (sm_uniform_mvp == -1) { fprintf(stderr, "Could not bind uniform %s\n", uniform_name); return 0; } //Create a framebuffer glGenFramebuffers(1, &fbo_handle); glBindFramebuffer(GL_FRAMEBUFFER, fbo_handle); //Create render buffer glGenRenderbuffers(1, &renderBuffer); glBindRenderbuffer(GL_RENDERBUFFER, renderBuffer); //Setup the shadow texture glGenTextures(1, &shadowMap_tex); glBindTexture(GL_TEXTURE_2D, shadowMap_tex); glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, s_res, s_res, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); return 0; } //Delete stuff void dnitShadowMap() { //Delete everything glDeleteFramebuffers(1, &fbo_handle); glDeleteRenderbuffers(1, &renderBuffer); glDeleteTextures(1, &shadowMap_tex); glDeleteProgram(shadowMap_prog); } int loadSMap() { //Bind MVP stuff glm::mat4 view = glm::lookAt(glm::vec3(10.0, 10.0, 5.0), glm::vec3(0.0, 0.0, 0.0), glm::vec3(0.0, 1.0, 0.0)); glm::mat4 projection = glm::ortho<float>(-10,10,-8,8,-10,40); glm::mat4 mvp = projection * view; glm::mat4 biasMatrix( 0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.5, 0.5, 0.5, 1.0 ); glm::mat4 lsMVP = biasMatrix * mvp; //Upload light source matrix to the main shader programs glUniformMatrix4fv(uniform_ls_mvp, 1, GL_FALSE, glm::value_ptr(lsMVP)); glUseProgram(shadowMap_prog); glUniformMatrix4fv(sm_uniform_mvp, 1, GL_FALSE, glm::value_ptr(mvp)); //Draw to the framebuffer (with depth buffer only draw) glBindFramebuffer(GL_FRAMEBUFFER, fbo_handle); glBindRenderbuffer(GL_RENDERBUFFER, renderBuffer); glBindTexture(GL_TEXTURE_2D, shadowMap_tex); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, shadowMap_tex, 0); glDrawBuffer(GL_NONE); glReadBuffer(GL_NONE); GLenum result = glCheckFramebufferStatus(GL_FRAMEBUFFER); if (GL_FRAMEBUFFER_COMPLETE != result) { printf("ERROR: Framebuffer is not complete.\n"); return -1; } //Draw shadow scene printf("Creating shadow buffers..\n"); int ticks = SDL_GetTicks(); glClear(GL_DEPTH_BUFFER_BIT); //Wipe the depth buffer glViewport(0, 0, s_res, s_res); isMappingShad = true; //DRAW glEnableVertexAttribArray(sm_attr_coord3d); glVertexAttribPointer(sm_attr_coord3d, 3, GL_FLOAT, GL_FALSE, 5*4, scene); glDrawArrays(GL_TRIANGLES, 0, 14*3); glDisableVertexAttribArray(sm_attr_coord3d); isMappingShad = false; glBindFramebuffer(GL_FRAMEBUFFER, 0); printf("Render Sbuf in %dms (GLerr: %d)\n", SDL_GetTicks() - ticks, glGetError()); return 0; } This is the full code for the POC shadow mapping project (C++) (Requires SDL 1.2, SDL-image 1.2, GLEW (1.5) and GLM development headers.) initShadowMap is called, followed by loadSMap, the scene is drawn from the camera POV and then dnitShadowMap is called. I followed this tutorial originally (Along with another more comprehensive tutorial which has disappeared as this guy re-configured his site but used to be here (404).) I've ensured that the scene is visible (as can be seen within the full project) to the light source (which uses an orthogonal projection matrix.) Shader utilities function fine in non-shadow-mapped projects. I should also note that at no point is the GL error state set. What am I doing wrong here and why did this not cause problems on my AMD card? (System: Ubuntu 12.04, Linux 3.2.0-49-generic, 64 bit, with the nvidia-experimental-310 driver package. All other games are functioning fine so it's most likely not a card/driver issue.)

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• How to update a QPixmap in a QGraphicsView with PyQt

  - by pops

  I am trying to paint on a QPixmap inside a QGraphicsView. The painting works fine, but the QGraphicsView doesn't update it. Here is some working code: #!/usr/bin/env python from PyQt4 import QtCore from PyQt4 import QtGui class Canvas(QtGui.QPixmap): """ Canvas for drawing""" def __init__(self, parent=None): QtGui.QPixmap.__init__(self, 64, 64) self.parent = parent self.imH = 64 self.imW = 64 self.fill(QtGui.QColor(0, 255, 255)) self.color = QtGui.QColor(0, 0, 0) def paintEvent(self, point=False): if point: p = QtGui.QPainter(self) p.setPen(QtGui.QPen(self.color, 1, QtCore.Qt.SolidLine)) p.drawPoints(point) def clic(self, mouseX, mouseY): self.paintEvent(QtCore.QPoint(mouseX, mouseY)) class GraphWidget(QtGui.QGraphicsView): """ Display, zoom, pan...""" def __init__(self): QtGui.QGraphicsView.__init__(self) self.im = Canvas(self) self.imH = self.im.height() self.imW = self.im.width() self.zoomN = 1 self.scene = QtGui.QGraphicsScene(self) self.scene.setItemIndexMethod(QtGui.QGraphicsScene.NoIndex) self.scene.setSceneRect(0, 0, self.imW, self.imH) self.scene.addPixmap(self.im) self.setScene(self.scene) self.setTransformationAnchor(QtGui.QGraphicsView.AnchorUnderMouse) self.setResizeAnchor(QtGui.QGraphicsView.AnchorViewCenter) self.setMinimumSize(400, 400) self.setWindowTitle("pix") def mousePressEvent(self, event): if event.buttons() == QtCore.Qt.LeftButton: pos = self.mapToScene(event.pos()) self.im.clic(pos.x(), pos.y()) #~ self.scene.update(0,0,64,64) #~ self.updateScene([QtCore.QRectF(0,0,64,64)]) self.scene.addPixmap(self.im) print('items') print(self.scene.items()) else: return QtGui.QGraphicsView.mousePressEvent(self, event) def wheelEvent(self, event): if event.delta() > 0: self.scaleView(2) elif event.delta() < 0: self.scaleView(0.5) def scaleView(self, factor): n = self.zoomN * factor if n < 1 or n > 16: return self.zoomN = n self.scale(factor, factor) if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) widget = GraphWidget() widget.show() sys.exit(app.exec_()) The mousePressEvent does some painting on the QPixmap. But the only solution I have found to update the display is to make a new instance (which is not a good solution). How do I just update it?

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• JavaFx 2.1, 2.2 TableView update issue

  - by Lewis Liu

  My application uses JPA read data into TableView then modify and display them. The table refreshed modified record under JavaFx 2.0.3. Under JavaFx 2.1, 2.2, the table wouldn't refresh the update anymore. I found other people have similar issue. My plan was to continue using 2.0.3 until someone fixes the issue under 2.1 and 2.2. Now I know it is not a bug and wouldn't be fixed. Well, I don't know how to deal with this. Following are codes are modified from sample demo to show the issue. If I add a new record or delete a old record from table, table refreshes fine. If I modify a record, the table wouldn't refreshes the change until a add, delete or sort action is taken. If I remove the modified record and add it again, table refreshes. But the modified record is put at button of table. Well, if I remove the modified record, add the same record then move the record to the original spot, the table wouldn't refresh anymore. Below is a completely code, please shine some light on this. import javafx.application.Application; import javafx.beans.property.SimpleStringProperty; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.geometry.HPos; import javafx.geometry.Insets; import javafx.geometry.Pos; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.control.cell.PropertyValueFactory; import javafx.scene.layout.GridPane; import javafx.scene.layout.HBox; import javafx.scene.layout.VBox; import javafx.scene.text.Font; import javafx.stage.Modality; import javafx.stage.Stage; import javafx.stage.StageStyle; public class Main extends Application { private TextField firtNameField = new TextField(); private TextField lastNameField = new TextField(); private TextField emailField = new TextField(); private Stage editView; private Person fPerson; public static class Person { private final SimpleStringProperty firstName; private final SimpleStringProperty lastName; private final SimpleStringProperty email; private Person(String fName, String lName, String email) { this.firstName = new SimpleStringProperty(fName); this.lastName = new SimpleStringProperty(lName); this.email = new SimpleStringProperty(email); } public String getFirstName() { return firstName.get(); } public void setFirstName(String fName) { firstName.set(fName); } public String getLastName() { return lastName.get(); } public void setLastName(String fName) { lastName.set(fName); } public String getEmail() { return email.get(); } public void setEmail(String fName) { email.set(fName); } } private TableView<Person> table = new TableView<Person>(); private final ObservableList<Person> data = FXCollections.observableArrayList( new Person("Jacob", "Smith", "[email protected]"), new Person("Isabella", "Johnson", "[email protected]"), new Person("Ethan", "Williams", "[email protected]"), new Person("Emma", "Jones", "[email protected]"), new Person("Michael", "Brown", "[email protected]")); public static void main(String[] args) { launch(args); } @Override public void start(Stage stage) { Scene scene = new Scene(new Group()); stage.setTitle("Table View Sample"); stage.setWidth(535); stage.setHeight(535); editView = new Stage(); final Label label = new Label("Address Book"); label.setFont(new Font("Arial", 20)); TableColumn firstNameCol = new TableColumn("First Name"); firstNameCol.setCellValueFactory( new PropertyValueFactory<Person, String>("firstName")); firstNameCol.setMinWidth(150); TableColumn lastNameCol = new TableColumn("Last Name"); lastNameCol.setCellValueFactory( new PropertyValueFactory<Person, String>("lastName")); lastNameCol.setMinWidth(150); TableColumn emailCol = new TableColumn("Email"); emailCol.setMinWidth(200); emailCol.setCellValueFactory( new PropertyValueFactory<Person, String>("email")); table.setItems(data); table.getColumns().addAll(firstNameCol, lastNameCol, emailCol); //--- create a edit button and a editPane to edit person Button addButton = new Button("Add"); addButton.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { fPerson = null; firtNameField.setText(""); lastNameField.setText(""); emailField.setText(""); editView.show(); } }); Button editButton = new Button("Edit"); editButton.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { if (table.getSelectionModel().getSelectedItem() != null) { fPerson = table.getSelectionModel().getSelectedItem(); firtNameField.setText(fPerson.getFirstName()); lastNameField.setText(fPerson.getLastName()); emailField.setText(fPerson.getEmail()); editView.show(); } } }); Button deleteButton = new Button("Delete"); deleteButton.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { if (table.getSelectionModel().getSelectedItem() != null) { data.remove(table.getSelectionModel().getSelectedItem()); } } }); HBox addEditDeleteButtonBox = new HBox(); addEditDeleteButtonBox.getChildren().addAll(addButton, editButton, deleteButton); addEditDeleteButtonBox.setAlignment(Pos.CENTER_RIGHT); addEditDeleteButtonBox.setSpacing(3); GridPane editPane = new GridPane(); editPane.getStyleClass().add("editView"); editPane.setPadding(new Insets(3)); editPane.setHgap(5); editPane.setVgap(5); Label personLbl = new Label("Person:"); editPane.add(personLbl, 0, 1); GridPane.setHalignment(personLbl, HPos.LEFT); firtNameField.setPrefWidth(250); lastNameField.setPrefWidth(250); emailField.setPrefWidth(250); Label firstNameLabel = new Label("First Name:"); Label lastNameLabel = new Label("Last Name:"); Label emailLabel = new Label("Email:"); editPane.add(firstNameLabel, 0, 3); editPane.add(firtNameField, 1, 3); editPane.add(lastNameLabel, 0, 4); editPane.add(lastNameField, 1, 4); editPane.add(emailLabel, 0, 5); editPane.add(emailField, 1, 5); GridPane.setHalignment(firstNameLabel, HPos.RIGHT); GridPane.setHalignment(lastNameLabel, HPos.RIGHT); GridPane.setHalignment(emailLabel, HPos.RIGHT); Button saveButton = new Button("Save"); saveButton.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { if (fPerson == null) { fPerson = new Person( firtNameField.getText(), lastNameField.getText(), emailField.getText()); data.add(fPerson); } else { int k = -1; if (data.size() > 0) { for (int i = 0; i < data.size(); i++) { if (data.get(i) == fPerson) { k = i; } } } fPerson.setFirstName(firtNameField.getText()); fPerson.setLastName(lastNameField.getText()); fPerson.setEmail(emailField.getText()); data.set(k, fPerson); table.setItems(data); // The following will work, but edited person has to be added to the button // // data.remove(fPerson); // data.add(fPerson); // add and remove refresh the table, but now move edited person to original spot, // it failed again with the following code // while (data.indexOf(fPerson) != k) { // int i = data.indexOf(fPerson); // Collections.swap(data, i, i - 1); // } } editView.close(); } }); Button cancelButton = new Button("Cancel"); cancelButton.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { editView.close(); } }); HBox saveCancelButtonBox = new HBox(); saveCancelButtonBox.getChildren().addAll(saveButton, cancelButton); saveCancelButtonBox.setAlignment(Pos.CENTER_RIGHT); saveCancelButtonBox.setSpacing(3); VBox editBox = new VBox(); editBox.getChildren().addAll(editPane, saveCancelButtonBox); Scene editScene = new Scene(editBox); editView.setTitle("Person"); editView.initStyle(StageStyle.UTILITY); editView.initModality(Modality.APPLICATION_MODAL); editView.setScene(editScene); editView.close(); final VBox vbox = new VBox(); vbox.setSpacing(5); vbox.getChildren().addAll(label, table, addEditDeleteButtonBox); vbox.setPadding(new Insets(10, 0, 0, 10)); ((Group) scene.getRoot()).getChildren().addAll(vbox); stage.setScene(scene); stage.show(); } }

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• Java Fx Data bind not working with File Read

  - by rjha94

  Hi I am using a very simple JavaFx client to upload files. I read the file in chunks of 1 MB (using Byte Buffer) and upload using multi part POST to a PHP script. I want to update the progress bar of my client to show progress after each chunk is uploaded. The calculations for upload progress look correct but the progress bar is not updated. I am using bind keyword. I am no JavaFx expert and I am hoping some one can point out my mistake. I am writing this client to fix the issues posted here (http://stackoverflow.com/questions/2447837/upload-1gb-files-using-chunking-in-php) /* * Main.fx * * Created on Mar 16, 2010, 1:58:32 PM */ package webgloo; import javafx.stage.Stage; import javafx.scene.Scene; import javafx.scene.layout.VBox; import javafx.geometry.VPos; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.layout.HBox; import javafx.scene.layout.LayoutInfo; import javafx.scene.text.Font; import javafx.scene.control.ProgressBar; import java.io.FileInputStream; /** * @author rajeev jha */ var totalBytes:Float = 1; var bytesWritten:Float = 0; var progressUpload:Float; var uploadURI = "http://www.test1.com/test/receiver.php"; var postMax = 1024000 ; function uploadFile(inputFile: java.io.File) { totalBytes = inputFile.length(); bytesWritten = 1; println("To-Upload - {totalBytes}"); var is = new FileInputStream(inputFile); var fc = is.getChannel(); //1 MB byte buffer var chunkCount = 0; var bb = java.nio.ByteBuffer.allocate(postMax); while(fc.read(bb) >= 0){ println("loop:start"); bb.flip(); var limit = bb.limit(); var bytes = GigaFileUploader.getBufferBytes(bb.array(), limit); var content = GigaFileUploader.createPostContent(inputFile.getName(), bytes); GigaFileUploader.upload(uploadURI, content); bytesWritten = bytesWritten + limit ; progressUpload = 1.0 * bytesWritten / totalBytes ; println("Progress is - {progressUpload}"); chunkCount++; bb.clear(); println("loop:end"); } } var label = Label { font: Font { size: 12 } text: bind "Uploaded - {bytesWritten * 100 / (totalBytes)}%" layoutInfo: LayoutInfo { vpos: VPos.CENTER maxWidth: 120 minWidth: 120 width: 120 height: 30 } } def jFileChooser = new javax.swing.JFileChooser(); jFileChooser.setApproveButtonText("Upload"); var button = Button { text: "Upload" layoutInfo: LayoutInfo { width: 100 height: 30 } action: function () { var outputFile = jFileChooser.showOpenDialog(null); if (outputFile == javax.swing.JFileChooser.APPROVE_OPTION) { uploadFile(jFileChooser.getSelectedFile()); } } } var hBox = HBox { spacing: 10 content: [label, button] } var progressBar = ProgressBar { progress: bind progressUpload layoutInfo: LayoutInfo { width: 240 height: 30 } } var vBox = VBox { spacing: 10 content: [hBox, progressBar] layoutX: 10 layoutY: 10 } Stage { title: "Upload File" width: 270 height: 120 scene: Scene { content: [vBox] } resizable: false }

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• pushScene and popScene or replaceScene . which should we use and when ?

  - by srikanth rongali

  I am using push scene to get the next scene. But, I read that for each PushScene the scene is stored in stack. The memory usage is more. So, I am using the replaceScene in place of pushScene. But, with replace scene I am getting the memory-bad-access message in debugger. So, I want to popScene after using it, so that the retain count is zero. But, I am confused in using popScene. If I have a Scene1 and Scene2. I used the following to go in to Scene2. Now I need to remove Scene1 from stack. [[CCDirector sharedDirector] pushScene:Scene2]; Where should I write the popScene to popScene1. How to get the previous scene in current running scene ? Thank you/

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• JavaFX - question regarding binding button's disabled state

  - by jamiebarrow

  I'm trying to create a dummy application that maintains a list of tasks. For now, all I'm trying to do is add to the list. I enter a task name in a text box, click on the add task button, and expect the list to be updated with the new item and the task name input to be cleared. I only want to be able to add tasks if the task name is not empty. The below code is my implementation, but I have a question regarding the binding. I'm binding the textbox's text variable to a string in my view model, and the button's disable variable to a boolean in my view model. I have a trigger to update the disabled state when the task name changes. When the binding of the task name happens the boolean is updated accordingly, but the button still appears disabled. But then when I mouse over the button, it becomes enabled. I believe this is due to JavaFX 1.3's binding being lazy - only updates the bound variable when it is read. Also, when I've added the task, I clear the task name in the model, but the textbox's text doesn't change - even though I'm using bind with inverse. Is there a way to make the textbox's text and the button's disabled state update automatically via the binding as I was expecting? Thanks, James AddTaskViewModel.fx: package jamiebarrow; import java.lang.System; public class AddTaskViewModel { function logChange(prop:String,oldValue,newValue):Void { println("{System.currentTimeMillis()} : {prop} [{oldValue}] to [{newValue}] "); } public var newTaskName: String on replace old { logChange("newTaskName",old,newTaskName); isAddTaskDisabled = (newTaskName == null or newTaskName.trim().length() == 0); }; public var isAddTaskDisabled: Boolean on replace old { logChange("isAddTaskDisabled",old,isAddTaskDisabled); }; public var taskItems = [] on replace old { logChange("taskItems",old,taskItems); }; public function addTask() { insert newTaskName into taskItems; newTaskName = ""; } } Main.fx: package jamiebarrow; import javafx.scene.control.Button; import javafx.scene.control.TextBox; import javafx.scene.control.ListView; import javafx.scene.Scene; import javafx.scene.layout.VBox; import javafx.stage.Stage; import javafx.scene.layout.HBox; def viewModel = AddTaskViewModel{}; var txtName: TextBox = TextBox { text: bind viewModel.newTaskName with inverse onKeyTyped: onKeyTyped }; function onKeyTyped(event): Void { txtName.commit(); // ensures model is updated cmdAddTask.disable = viewModel.isAddTaskDisabled;// the binding only occurs lazily, so this is needed } var cmdAddTask = Button { text: "Add" disable: bind viewModel.isAddTaskDisabled with inverse action: onAddTask }; function onAddTask(): Void { viewModel.addTask(); } var lstTasks = ListView { items: bind viewModel.taskItems with inverse }; Stage { scene: Scene { content: [ VBox { content: [ HBox { content: [ txtName, cmdAddTask ] }, lstTasks ] } ] } }

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• How to Make a Game like Space Invaders - Ray Wenderlich (why do my space invaders scroll off screen)

  - by Erv Noel

  I'm following this tutorial(http://www.raywenderlich.com/51068/how-to-make-a-game-like-space-invaders-with-sprite-kit-tutorial-part-1) and I've run into a problem right after the part where I add [self determineInvaderMovementDirection]; to my GameScene.m file (specifically to my moveInvadersForUpdate method) The tutorial states that the space invaders should be moving accordingly after adding this piece of code but when I run they move to the left and they do not come back. I'm not sure what I am doing wrong as I have followed this tutorial very carefully. Any help or clarification would be greatly appreciated. Thanks in advance ! Here is the full GameScene.m #import "GameScene.h" #import <CoreMotion/CoreMotion.h> #pragma mark - Custom Type Definitions /* The type definition and constant definitions 1,2,3 take care of the following tasks: 1.Define the possible types of invader enemies. This can be used in switch statements later when things like displaying different sprites images for each enemy type. The typedef makes InvaderType a formal Obj-C type that is type checked for method arguments and variables.This is so that the wrong method argument is not used or assigned to the wrong variable. 2. Define the size of the invaders and that they'll be laid out in a grid of rows and columns on the screen. 3. Define a name that will be used to identify invaders when searching for them. */ //1 typedef enum InvaderType { InvaderTypeA, InvaderTypeB, InvaderTypeC } InvaderType; /* Invaders move in a fixed pattern: right, right, down, left, down, right right. InvaderMovementDirection tracks the invaders' progress through this pattern */ typedef enum InvaderMovementDirection { InvaderMovementDirectionRight, InvaderMovementDirectionLeft, InvaderMovementDirectionDownThenRight, InvaderMovementDirectionDownThenLeft, InvaderMovementDirectionNone } InvaderMovementDirection; //2 #define kInvaderSize CGSizeMake(24,16) #define kInvaderGridSpacing CGSizeMake(12,12) #define kInvaderRowCount 6 #define kInvaderColCount 6 //3 #define kInvaderName @"invader" #define kShipSize CGSizeMake(30, 16) //stores the size of the ship #define kShipName @"ship" // stores the name of the ship stored on the sprite node #define kScoreHudName @"scoreHud" #define kHealthHudName @"healthHud" /* this class extension allows you to add “private” properties to GameScene class, without revealing the properties to other classes or code. You still get the benefit of using Objective-C properties, but your GameScene state is stored internally and can’t be modified by other external classes. As well, it doesn’t clutter the namespace of datatypes that your other classes see. This class extension is used in the method didMoveToView */ #pragma mark - Private GameScene Properties @interface GameScene () @property BOOL contentCreated; @property InvaderMovementDirection invaderMovementDirection; @property NSTimeInterval timeOfLastMove; @property NSTimeInterval timePerMove; @end @implementation GameScene #pragma mark Object Lifecycle Management #pragma mark - Scene Setup and Content Creation /*This method simply invokes createContent using the BOOL property contentCreated to make sure you don’t create your scene’s content more than once. This property is defined in an Objective-C Class Extension found near the top of the file()*/ - (void)didMoveToView:(SKView *)view { if (!self.contentCreated) { [self createContent]; self.contentCreated = YES; } } - (void)createContent { //1 - Invaders begin by moving to the right self.invaderMovementDirection = InvaderMovementDirectionRight; //2 - Invaders take 1 sec for each move. Each step left, right or down // takes 1 second. self.timePerMove = 1.0; //3 - Invaders haven't moved yet, so set the time to zero self.timeOfLastMove = 0.0; [self setupInvaders]; [self setupShip]; [self setupHud]; } /* Creates an invade sprite of a given type 1. Use the invadeType parameterr to determine color of the invader 2. Call spriteNodeWithColor:size: of SKSpriteNode to alloc and init a sprite that renders as a rect of the given color invaderColor with size kInvaderSize */ -(SKNode*)makeInvaderOfType:(InvaderType)invaderType { //1 SKColor* invaderColor; switch (invaderType) { case InvaderTypeA: invaderColor = [SKColor redColor]; break; case InvaderTypeB: invaderColor = [SKColor greenColor]; break; case InvaderTypeC: invaderColor = [SKColor blueColor]; break; } //2 SKSpriteNode* invader = [SKSpriteNode spriteNodeWithColor:invaderColor size:kInvaderSize]; invader.name = kInvaderName; return invader; } -(void)setupInvaders { //1 - loop over the rows CGPoint baseOrigin = CGPointMake(kInvaderSize.width / 2, 180); for (NSUInteger row = 0; row < kInvaderRowCount; ++row) { //2 - Choose a single InvaderType for all invaders // in this row based on the row number InvaderType invaderType; if (row % 3 == 0) invaderType = InvaderTypeA; else if (row % 3 == 1) invaderType = InvaderTypeB; else invaderType = InvaderTypeC; //3 - Does some math to figure out where the first invader // in the row should be positioned CGPoint invaderPosition = CGPointMake(baseOrigin.x, row * (kInvaderGridSpacing.height + kInvaderSize.height) + baseOrigin.y); //4 - Loop over the columns for (NSUInteger col = 0; col < kInvaderColCount; ++col) { //5 - Create an invader for the current row and column and add it // to the scene SKNode* invader = [self makeInvaderOfType:invaderType]; invader.position = invaderPosition; [self addChild:invader]; //6 - update the invaderPosition so that it's correct for the //next invader invaderPosition.x += kInvaderSize.width + kInvaderGridSpacing.width; } } } -(void)setupShip { //1 - creates ship using makeShip. makeShip can easily be used later // to create another ship (ex. to set up more lives) SKNode* ship = [self makeShip]; //2 - Places the ship on the screen. In SpriteKit the origin is at the lower //left corner of the screen. The anchorPoint is based on a unit square with (0, 0) at the lower left of the sprite's area and (1, 1) at its top right. Since SKSpriteNode has a default anchorPoint of (0.5, 0.5), i.e., its center, the ship's position is the position of its center. Positioning the ship at kShipSize.height/2.0f means that half of the ship's height will protrude below its position and half above. If you check the math, you'll see that the ship's bottom aligns exactly with the bottom of the scene. ship.position = CGPointMake(self.size.width / 2.0f, kShipSize.height/2.0f); [self addChild:ship]; } -(SKNode*)makeShip { SKNode* ship = [SKSpriteNode spriteNodeWithColor:[SKColor greenColor] size:kShipSize]; ship.name = kShipName; return ship; } -(void)setupHud { //Sets the score label font to Courier SKLabelNode* scoreLabel = [SKLabelNode labelNodeWithFontNamed:@"Courier"]; //1 - Give the score label a name so it becomes easy to find later when // the score needs to be updated. scoreLabel.name = kScoreHudName; scoreLabel.fontSize = 15; //2 - Color the score label green scoreLabel.fontColor = [SKColor greenColor]; scoreLabel.text = [NSString stringWithFormat:@"Score: %04u", 0]; //3 - Positions the score label near the top left corner of the screen scoreLabel.position = CGPointMake(20 + scoreLabel.frame.size.width/2, self.size.height - (20 + scoreLabel.frame.size.height/2)); [self addChild:scoreLabel]; //Applies the font of the health label SKLabelNode* healthLabel = [SKLabelNode labelNodeWithFontNamed:@"Courier"]; //4 - Give the health label a name so it can be referenced later when it needs // to be updated to display the health healthLabel.name = kHealthHudName; healthLabel.fontSize = 15; //5 - Colors the health label red healthLabel.fontColor = [SKColor redColor]; healthLabel.text = [NSString stringWithFormat:@"Health: %.1f%%", 100.0f]; //6 - Positions the health Label on the upper right hand side of the screen healthLabel.position = CGPointMake(self.size.width - healthLabel.frame.size.width/2 - 20, self.size.height - (20 + healthLabel.frame.size.height/2)); [self addChild:healthLabel]; } #pragma mark - Scene Update - (void)update:(NSTimeInterval)currentTime { //Makes the invaders move [self moveInvadersForUpdate:currentTime]; } #pragma mark - Scene Update Helpers //This method will get invoked by update -(void)moveInvadersForUpdate:(NSTimeInterval)currentTime { //1 - if it's not yet time to move, exit the method. moveInvadersForUpdate: // is invoked 60 times per second, but you don't want the invaders to move // that often since the movement would be too fast to see if (currentTime - self.timeOfLastMove < self.timePerMove) return; //2 - Recall that the scene holds all the invaders as child nodes; which were // added to the scene using addChild: in setupInvaders identifying each invader // by its name property. Invoking enumerateChildNodesWithName:usingBlock only loops over the invaders because they're named kInvaderType; which makes the loop skip the ship and the HUD. The guts og the block moves the invaders 10 pixels either right, left or down depending on the value of invaderMovementDirection [self enumerateChildNodesWithName:kInvaderName usingBlock:^(SKNode *node, BOOL *stop) { switch (self.invaderMovementDirection) { case InvaderMovementDirectionRight: node.position = CGPointMake(node.position.x - 10, node.position.y); break; case InvaderMovementDirectionLeft: node.position = CGPointMake(node.position.x - 10, node.position.y); break; case InvaderMovementDirectionDownThenLeft: case InvaderMovementDirectionDownThenRight: node.position = CGPointMake(node.position.x, node.position.y - 10); break; InvaderMovementDirectionNone: default: break; } }]; //3 - Record that you just moved the invaders, so that the next time this method is invoked (1/60th of a second from when it starts), the invaders won't move again until the set time period of one second has elapsed. self.timeOfLastMove = currentTime; //Makes it so that the invader movement direction changes only when the invaders are actually moving. Invaders only move when the check on self.timeOfLastMove passes (when conditional expression is true) [self determineInvaderMovementDirection]; } #pragma mark - Invader Movement Helpers -(void)determineInvaderMovementDirection { //1 - Since local vars accessed by block are default const(means they cannot be changed), this snippet of code qualifies proposedMovementDirection with __block so that you can modify it in //2 __block InvaderMovementDirection proposedMovementDirection = self.invaderMovementDirection; //2 - Loops over the invaders in the scene and refers to the block with the invader as an argument [self enumerateChildNodesWithName:kInvaderName usingBlock:^(SKNode *node, BOOL *stop) { switch (self.invaderMovementDirection) { case InvaderMovementDirectionRight: //3 - If the invader's right edge is within 1pt of the right edge of the scene, it's about to move offscreen. Sets proposedMovementDirection so that the invaders move down then left. You compare the invader's frame(the frame that contains its content in the scene's coordinate system) with the scene width. Since the scene has an anchorPoint of (0,0) by default and is scaled to fill it's parent view, this comparison ensures you're testing against the view's edges. if (CGRectGetMaxX(node.frame) >= node.scene.size.width - 1.0f) { proposedMovementDirection = InvaderMovementDirectionDownThenLeft; *stop = YES; } break; case InvaderMovementDirectionLeft: //4 - If the invader's left edge is within 1 pt of the left edge of the scene, it's about to move offscreen. Sets the proposedMovementDirection so invaders move down then right if (CGRectGetMinX(node.frame) <= 1.0f) { proposedMovementDirection = InvaderMovementDirectionDownThenRight; *stop = YES; } break; case InvaderMovementDirectionDownThenLeft: //5 - If invaders are moving down then left, they already moved down at this point, so they should now move left. proposedMovementDirection = InvaderMovementDirectionLeft; *stop = YES; break; case InvaderMovementDirectionDownThenRight: //6 - if the invaders are moving down then right, they already moved down so they should now move right. proposedMovementDirection = InvaderMovementDirectionRight; *stop = YES; break; default: break; } }]; //7 - if the proposed invader movement direction is different than the current invader movement direction, update the current direction to the proposed direction if (proposedMovementDirection != self.invaderMovementDirection) { self.invaderMovementDirection = proposedMovementDirection; } } #pragma mark - Bullet Helpers #pragma mark - User Tap Helpers #pragma mark - HUD Helpers #pragma mark - Physics Contact Helpers #pragma mark - Game End Helpers @end

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• Show a SplashScreenScene before to GameScene?

  - by lisovaccaro

  I want to add a splash screen to my game. I created a SplashScene.sks and a SplashScene.swift file. I'm trying to load my SplashScene before GameScene but I cannot manage to do it. How should I do this? This is what I'm trying now: class GameViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let skView = self.view as SKView skView.ignoresSiblingOrder = true /* Set the scale mode to scale to fit the window */ var scene = SplashScreenScene() // Present SplashScreenScene first scene.scaleMode = .AspectFill skView.presentScene(scene) } Then on my SplashScreenScene: class SplashScreenScene: SKScene { override func didMoveToView(view: SKView) { self.size = view.bounds.size self.anchorPoint = CGPointMake(0.5, 0.5) var background = SKSpriteNode(imageNamed:"LaunchImage") self.addChild(background) // Start timer to load next scene NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("changeScene"), userInfo: nil, repeats: false) } func changeScene() { let scene = GameScene() view.presentScene(scene) } } This is very close to the solution, however for some reason when I do this my game becomes laggy (if I present GameScene directly the game runs fine).

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• How do I use the gravity vector to correctly transform scene for augmented reality?

  - by gpdawson

  I'm trying figure out how to get an OpenGL specified object to be displayed correctly according to the device orientation (ie. according to the gravity vector from the accelerometer, and heading from compass). The GLGravity sample project has an example which is almost like this (despite ignoring heading), but it has some glitches. For example, the teapot jumps 180deg as the device viewing angle crosses the horizon, and it also rotates spuriously if you tilt the device from portrait into landscape. This is fine for the context of this app, as it just shows off an object and it doesn't matter that it does these things. But it means that the code just doesn't work when you attempt to emulate real life viewing of an OpenGL object according to the device's orientation. What happens is that it almost works, but the heading rotation you apply from the compass gets "corrupted" by the spurious additional rotations seen in the GLGravity example project. Can anyone provide sample code that shows how to adjust correctly for the device orientation (ie. gravity vector), or to fix the GLGravity example so that it doesn't include spurious heading changes? //Clear matrix to be used to rotate from the current referential to one based on the gravity vector bzero(matrix, sizeof(matrix)); matrix[3][3] = 1.0; //Setup first matrix column as gravity vector matrix[0][0] = accel[0] / length; matrix[0][1] = accel[1] / length; matrix[0][2] = accel[2] / length; //Setup second matrix column as an arbitrary vector in the plane perpendicular to the gravity vector {Gx, Gy, Gz} defined by by the equation "Gx * x + Gy * y + Gz * z = 0" in which we arbitrarily set x=0 and y=1 matrix[1][0] = 0.0; matrix[1][1] = 1.0; matrix[1][2] = -accel[1] / accel[2]; length = sqrtf(matrix[1][0] * matrix[1][0] + matrix[1][1] * matrix[1][1] + matrix[1][2] * matrix[1][2]); matrix[1][0] /= length; matrix[1][1] /= length; matrix[1][2] /= length; //Setup third matrix column as the cross product of the first two matrix[2][0] = matrix[0][1] * matrix[1][2] - matrix[0][2] * matrix[1][1]; matrix[2][1] = matrix[1][0] * matrix[0][2] - matrix[1][2] * matrix[0][0]; matrix[2][2] = matrix[0][0] * matrix[1][1] - matrix[0][1] * matrix[1][0]; //Finally load matrix glMultMatrixf((GLfloat*)matrix);

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• How can I break into the development business scene if I'm the new kid on the block?

  - by Sergio Tapia

  I'm about 1 semester short of graduating from college with my Systems Engineer degree. I've started my own software development company here in a country in South America last week, and so far I managed to land myself a nice account. I have to build a simple enough program that will take me 6-7weeks to complete and I'll charge 2000$. 40% up front and the rest on completion. While this is great and I'm really excited about my first project (Hell it's a landmark for any professional!), I'm already setting my eye on landing projects that will be visible for other companies to see. I've spoken with many people in my trade around town and it seems there are two companies that manage the big accounts with other small companies scrounging around for the scraps. How can I break this so called fellowship that is pretty much a monopoly here? Any and all suggestions will be massively appreciated.

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• C++ FBX Animation Importer Using the FBX SDK

  - by Mike Sawayda

  Does anyone have any experience using the FBX SDK to load in animations. I got the meshes loaded in correctly with all of their verts, indices, UV's, and normals. I am just now trying to get the Animations working correctly. I have looked at the FBX SDK documentation with little help. If someone could just help me get started or point me in the right direction I would greatly appreciate it. I added some code so you can kinda get an idea of what I am doing. I should be able to place that code anywhere in the load FBX function and have it work. //GETTING ANIMAION DATA for(int i = 0; i < scene->GetSrcObjectCount<FbxAnimStack>(); ++i) { FbxAnimStack* lAnimStack = scene->GetSrcObject<FbxAnimStack>(i); FbxString stackName = "Animation Stack Name: "; stackName += lAnimStack->GetName(); string sStackName = stackName; int numLayers = lAnimStack->GetMemberCount<FbxAnimLayer>(); for(int j = 0; j < numLayers; ++j) { FbxAnimLayer* lAnimLayer = lAnimStack->GetMember<FbxAnimLayer>(j); FbxString layerName = "Animation Stack Name: "; layerName += lAnimLayer->GetName(); string sLayerName = layerName; queue<FbxNode*> nodes; FbxNode* tempNode = scene->GetRootNode(); while(tempNode != NULL) { FbxAnimCurve* lAnimCurve = tempNode->LclTranslation.GetCurve(lAnimLayer, FBXSDK_CURVENODE_COMPONENT_X); if(lAnimCurve != NULL) { //I know something needs to be done here but I dont know what. } for(int i = 0; i < tempNode->GetChildCount(false); ++i) { nodes.push(tempNode->GetChild(i)); } if(nodes.size() > 0) { tempNode = nodes.front(); nodes.pop(); } else { tempNode = NULL; } } } } Here is the full function bool FBXLoader::LoadFBX(ParentMeshObject* _parentMesh, char* _filePath, bool _hasTexture) { FbxManager* fbxManager = FbxManager::Create(); if(!fbxManager) { printf( "ERROR %s : %d failed creating FBX Manager!\n", __FILE__, __LINE__ ); } FbxIOSettings* ioSettings = FbxIOSettings::Create(fbxManager, IOSROOT); fbxManager->SetIOSettings(ioSettings); FbxString filePath = FbxGetApplicationDirectory(); fbxManager->LoadPluginsDirectory(filePath.Buffer()); FbxScene* scene = FbxScene::Create(fbxManager, ""); int fileMinor, fileRevision; int sdkMajor, sdkMinor, sdkRevision; int fileFormat; FbxManager::GetFileFormatVersion(sdkMajor, sdkMinor, sdkRevision); FbxImporter* importer = FbxImporter::Create(fbxManager, ""); if(!fbxManager->GetIOPluginRegistry()->DetectReaderFileFormat(_filePath, fileFormat)) { //Unrecognizable file format. Try to fall back on FbxImorter::eFBX_BINARY fileFormat = fbxManager->GetIOPluginRegistry()->FindReaderIDByDescription("FBX binary (*.fbx)"); } bool importStatus = importer->Initialize(_filePath, fileFormat, fbxManager->GetIOSettings()); importer->GetFileVersion(fileMinor, fileMinor, fileRevision); if(!importStatus) { printf( "ERROR %s : %d FbxImporter Initialize failed!\n", __FILE__, __LINE__ ); return false; } importStatus = importer->Import(scene); if(!importStatus) { printf( "ERROR %s : %d FbxImporter failed to import the file to the scene!\n", __FILE__, __LINE__ ); return false; } FbxAxisSystem sceneAxisSystem = scene->GetGlobalSettings().GetAxisSystem(); FbxAxisSystem axisSystem( FbxAxisSystem::eYAxis, FbxAxisSystem::eParityOdd, FbxAxisSystem::eLeftHanded ); if(sceneAxisSystem != axisSystem) { axisSystem.ConvertScene(scene); } TriangulateRecursive(scene->GetRootNode()); FbxArray<FbxMesh*> meshes; FillMeshArray(scene, meshes); unsigned short vertexCount = 0; unsigned short triangleCount = 0; unsigned short faceCount = 0; unsigned short materialCount = 0; int numberOfVertices = 0; for(int i = 0; i < meshes.GetCount(); ++i) { numberOfVertices += meshes[i]->GetPolygonVertexCount(); } Face face; vector<Face> faces; int indicesCount = 0; int ptrMove = 0; float wValue = 0.0f; if(!_hasTexture) { wValue = 1.0f; } for(int i = 0; i < meshes.GetCount(); ++i) { int vertexCount = 0; vertexCount = meshes[i]->GetControlPointsCount(); if(vertexCount == 0) continue; VertexType* vertices; vertices = new VertexType[vertexCount]; int triangleCount = meshes[i]->GetPolygonVertexCount() / 3; indicesCount = meshes[i]->GetPolygonVertexCount(); FbxVector4* fbxVerts = new FbxVector4[vertexCount]; int arrayIndex = 0; memcpy(fbxVerts, meshes[i]->GetControlPoints(), vertexCount * sizeof(FbxVector4)); for(int j = 0; j < triangleCount; ++j) { int index = 0; FbxVector4 fbxNorm(0, 0, 0, 0); FbxVector2 fbxUV(0, 0); bool texCoordFound = false; face.indices[0] = index = meshes[i]->GetPolygonVertex(j, 0); vertices[index].position.x = (float)fbxVerts[index][0]; vertices[index].position.y = (float)fbxVerts[index][1]; vertices[index].position.z = (float)fbxVerts[index][2]; vertices[index].position.w = wValue; meshes[i]->GetPolygonVertexNormal(j, 0, fbxNorm); vertices[index].normal.x = (float)fbxNorm[0]; vertices[index].normal.y = (float)fbxNorm[1]; vertices[index].normal.z = (float)fbxNorm[2]; texCoordFound = meshes[i]->GetPolygonVertexUV(j, 0, "map1", fbxUV); vertices[index].texture.x = (float)fbxUV[0]; vertices[index].texture.y = (float)fbxUV[1]; face.indices[1] = index = meshes[i]->GetPolygonVertex(j, 1); vertices[index].position.x = (float)fbxVerts[index][0]; vertices[index].position.y = (float)fbxVerts[index][1]; vertices[index].position.z = (float)fbxVerts[index][2]; vertices[index].position.w = wValue; meshes[i]->GetPolygonVertexNormal(j, 1, fbxNorm); vertices[index].normal.x = (float)fbxNorm[0]; vertices[index].normal.y = (float)fbxNorm[1]; vertices[index].normal.z = (float)fbxNorm[2]; texCoordFound = meshes[i]->GetPolygonVertexUV(j, 1, "map1", fbxUV); vertices[index].texture.x = (float)fbxUV[0]; vertices[index].texture.y = (float)fbxUV[1]; face.indices[2] = index = meshes[i]->GetPolygonVertex(j, 2); vertices[index].position.x = (float)fbxVerts[index][0]; vertices[index].position.y = (float)fbxVerts[index][1]; vertices[index].position.z = (float)fbxVerts[index][2]; vertices[index].position.w = wValue; meshes[i]->GetPolygonVertexNormal(j, 2, fbxNorm); vertices[index].normal.x = (float)fbxNorm[0]; vertices[index].normal.y = (float)fbxNorm[1]; vertices[index].normal.z = (float)fbxNorm[2]; texCoordFound = meshes[i]->GetPolygonVertexUV(j, 2, "map1", fbxUV); vertices[index].texture.x = (float)fbxUV[0]; vertices[index].texture.y = (float)fbxUV[1]; faces.push_back(face); } meshes[i]->Destroy(); meshes[i] = NULL; int indexCount = faces.size() * 3; unsigned long* indices = new unsigned long[faces.size() * 3]; int indicie = 0; for(unsigned int i = 0; i < faces.size(); ++i) { indices[indicie++] = faces[i].indices[0]; indices[indicie++] = faces[i].indices[1]; indices[indicie++] = faces[i].indices[2]; } faces.clear(); _parentMesh->AddChild(vertices, indices, vertexCount, indexCount); } return true; }

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• AndEngine; Box2D - high speed body overlapping, prismatic joints

  - by Visher

  I'm trying to make good suspension for my car game, but I'm getting nervous of some problems with it. At the beginning, I've tried to make it out of one prismatic joint/revolute joint per one wheel only, but surprisingly prismatic joint that should only move in Y asix moves also in X axis, if car travels very fast, or even on low speeds if there's setContinuousPhysics = true. This causes wheels to "shift back", moving them away from axle. Now I've tried to add some bodies that will keep it in place: Suspension helper collides with spring only, wheel doesn't collide with spring&helper&vehicle body This is how I create those elements: rect = new Rectangle(1100, 1350, 200, 50, getVertexBufferObjectManager()); rect.setColor(Color.RED); scene.attachChild(rect); //rect.setRotation(90); Rectangle miniRect1 = new Rectangle(1102, 1355, 30, 50, getVertexBufferObjectManager()); miniRect1.setColor(0, 0, 1, 0.5f); miniRect1.setVisible(true); scene.attachChild(miniRect1); Rectangle miniRect2 = new Rectangle(1268, 1355, 30, 50, getVertexBufferObjectManager()); miniRect2.setColor(0, 0, 1, 0.5f); miniRect1.setVisible(true); scene.attachChild(miniRect2); rectBody = PhysicsFactory.createBoxBody( physicsWorld, rect, BodyDef.BodyType.DynamicBody, PhysicsFactory.createFixtureDef(10.0f, 0.01f, 10.0f)); rectBody.setUserData("car"); Body miniRect1Body = PhysicsFactory.createBoxBody( physicsWorld, miniRect1, BodyDef.BodyType.DynamicBody, PhysicsFactory.createFixtureDef(10.0f, 0.01f, 10.0f)); miniRect1Body.setUserData("suspension"); Body miniRect2Body = PhysicsFactory.createBoxBody( physicsWorld, miniRect2, BodyDef.BodyType.DynamicBody, PhysicsFactory.createFixtureDef(10.0f, 0.01f, 10.0f)); miniRect2Body.setUserData("suspension"); physicsWorld.registerPhysicsConnector(new PhysicsConnector(rect, rectBody, true, true)); physicsWorld.registerPhysicsConnector(new PhysicsConnector(miniRect1, miniRect1Body, true, true)); physicsWorld.registerPhysicsConnector(new PhysicsConnector(miniRect2, miniRect2Body, true, true)); PrismaticJointDef miniRect1JointDef = new PrismaticJointDef(); miniRect1JointDef.initialize(rectBody, miniRect1Body, miniRect1Body.getWorldCenter(), new Vector2(0.0f, 0.3f)); miniRect1JointDef.collideConnected = false; miniRect1JointDef.enableMotor= true; miniRect1JointDef.maxMotorForce = 15; miniRect1JointDef.motorSpeed = 5; miniRect1JointDef.enableLimit = true; physicsWorld.createJoint(miniRect1JointDef); PrismaticJointDef miniRect2JointDef = new PrismaticJointDef(); miniRect2JointDef.initialize(rectBody, miniRect2Body, miniRect2Body.getWorldCenter(), new Vector2(0.0f, 0.3f)); miniRect2JointDef.collideConnected = false; miniRect2JointDef.enableMotor= true; miniRect2JointDef.maxMotorForce = 15; miniRect2JointDef.motorSpeed = 5; miniRect2JointDef.enableLimit = true; physicsWorld.createJoint(miniRect2JointDef); scene.attachChild(karoseriaSprite); Rectangle r1 = new Rectangle(1050, 1300, 52, 150, getVertexBufferObjectManager()); r1.setColor(0, 1, 0, 0.5f); r1.setVisible(true); scene.attachChild(r1); Body r1body = PhysicsFactory.createBoxBody(physicsWorld, r1, BodyDef.BodyType.DynamicBody, PhysicsFactory.createFixtureDef(10.0f, 0.001f, 0.01f)); r1body.setUserData("suspensionHelper"); physicsWorld.registerPhysicsConnector(new PhysicsConnector(r1, r1body, true, true)); WeldJointDef r1jointDef = new WeldJointDef(); r1jointDef.initialize(r1body, rectBody, r1body.getWorldCenter()); physicsWorld.createJoint(r1jointDef); Rectangle r2 = new Rectangle(1132, 1300, 136, 150, getVertexBufferObjectManager()); r2.setColor(0, 1, 0, 0.5f); r2.setVisible(true); scene.attachChild(r2); Body r2body = PhysicsFactory.createBoxBody(physicsWorld, r2, BodyDef.BodyType.DynamicBody, PhysicsFactory.createFixtureDef(10.0f, 0.001f, 0.01f)); r2body.setUserData("suspensionHelper"); physicsWorld.registerPhysicsConnector(new PhysicsConnector(r2, r2body, true, true)); WeldJointDef r2jointDef = new WeldJointDef(); r2jointDef.initialize(r2body, rectBody, r2body.getWorldCenter()); physicsWorld.createJoint(r2jointDef); Rectangle r3 = new Rectangle(1298, 1300, 50, 150, getVertexBufferObjectManager()); r3.setColor(0, 1, 0, 0.5f); r3.setVisible(true); scene.attachChild(r3); Body r3body = PhysicsFactory.createBoxBody(physicsWorld, r3, BodyDef.BodyType.DynamicBody, PhysicsFactory.createFixtureDef(1f, 0.01f, 0.01f)); r3body.setUserData("suspensionHelper"); physicsWorld.registerPhysicsConnector(new PhysicsConnector(r3, r3body, true, true)); WeldJointDef r3jointDef = new WeldJointDef(); r3jointDef.initialize(r3body, rectBody, r3body.getWorldCenter()); physicsWorld.createJoint(r3jointDef); MouseJointDef md = new MouseJointDef(); Sprite wheel1 = new Sprite( miniRect1.getX()+miniRect1.getWidth()/2-wheelTexture.getWidth()/2, miniRect1.getY()+miniRect1.getHeight()-wheelTexture.getHeight()/2, wheelTexture, engine.getVertexBufferObjectManager()); scene.attachChild(wheel1); Body wheel1body = PhysicsFactory.createCircleBody( physicsWorld, wheel1, BodyDef.BodyType.DynamicBody, PhysicsFactory.createFixtureDef(10.0f, 0.01f, 5.0f)); wheel1body.setUserData("wheel"); Shape wheel1shape = wheel1body.getFixtureList().get(0).getShape(); wheel1shape.setRadius(wheel1shape.getRadius()*(3.0f/4.0f)); physicsWorld.registerPhysicsConnector(new PhysicsConnector(wheel1, wheel1body, true, true)); Sprite wheel2 = new Sprite( miniRect2.getX()+miniRect2.getWidth()/2-wheelTexture.getWidth()/2, miniRect2.getY()+miniRect2.getHeight()-wheelTexture.getHeight()/2, wheelTexture, engine.getVertexBufferObjectManager()); scene.attachChild(wheel2); Body wheel2body = PhysicsFactory.createCircleBody( physicsWorld, wheel2, BodyDef.BodyType.DynamicBody, PhysicsFactory.createFixtureDef(10.0f, 0.01f, 5.0f)); wheel2body.setUserData("wheel"); Shape wheel2shape = wheel2body.getFixtureList().get(0).getShape(); wheel2shape.setRadius(wheel2shape.getRadius()*(3.0f/4.0f)); physicsWorld.registerPhysicsConnector(new PhysicsConnector(wheel2, wheel2body, true, true)); RevoluteJointDef frontWheelRevoluteJointDef = new RevoluteJointDef(); frontWheelRevoluteJointDef.initialize(wheel1body, miniRect1Body, wheel1body.getWorldCenter()); frontWheelRevoluteJointDef.collideConnected = false; RevoluteJointDef rearWheelRevoluteJointDef = new RevoluteJointDef(); rearWheelRevoluteJointDef.initialize(wheel2body, miniRect2Body, wheel2body.getWorldCenter()); rearWheelRevoluteJointDef.collideConnected = false; rearWheelRevoluteJointDef.motorSpeed = 2050; rearWheelRevoluteJointDef.maxMotorTorque= 3580; physicsWorld.createJoint(frontWheelRevoluteJointDef); Joint j = physicsWorld.createJoint(rearWheelRevoluteJointDef); rearWheelRevoluteJoint = (RevoluteJoint)j; r1body.setBullet(true); r2body.setBullet(true); r3body.setBullet(true); miniRect1Body.setBullet(true); miniRect2Body.setBullet(true); rectBody.setBullet(true); at low speeds, it's OK, but on high speed vehicle can even flip around on flat ground.. Is there a way to make this work better?

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• How are events in games handled?

  - by Alex

  In may games that I have played, I have seen events being triggered, such as when you walk into a certain land area while holding a specific object, it will trigger a special creature to spawn. I was wondering, how do games deal with events such as this? Not in a specific game, but in general among games. The first thought I had was that each place has a hard-coded set of events that it will call when something happens there. However, that would be too inefficient to maintain, as when something new is added, that would require modification of every part of the game that would potentially cause the event to be called. Next up, I had the idea of maybe how GUI programming works. In all of the GUI programming I've done, you create a component and a callback function, or a listener. Then, when the user interacts when the button, the callback function is called, allowing you to do something with it. So, I was thinking that in terms of a game, when a land area gets loaded the game loops over a list of all events, creating instances of them and calling public methods to bind them to the current scene. The events themselves then handle what scene it is, and if it is a scene that pertains to the event, will call the public method of the scene to bind the event to an action. Then, when the action takes place, the scene would call all events that are bound to that action. However, I'm sure that's not how games would operate either, as that would require a lot of creating of events all the time. So how to video games handle events, are either of those methods correct, or is it something completely different?

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• JOGL hardware based shadow mapping - computing the texture matrix

  - by axel22

  I am implementing hardware shadow mapping as described here. I've rendered the scene successfully from the light POV, and loaded the depth buffer of the scene into a texture. This texture has correctly been loaded - I check this by rendering a small thumbnail, as you can see in the screenshot below, upper left corner. The depth of the scene appears to be correct - objects further away are darker, and that are closer to the light are lighter. However, I run into trouble while rendering the scene from the camera's point of view using the depth texture - the texture on the polygons in the scene is rendered in a weird, nondeterministic fashion, as shown in the screenshot. I believe I am making an error while computing the texture transformation matrix, but I am unsure where exactly. Since I have no matrix utilities in JOGL other then the gl[Load|Mult]Matrix procedures, I multiply the matrices using them, like this: void calcTextureMatrix() { glPushMatrix(); glLoadIdentity(); glLoadMatrixf(biasmatrix, 0); glMultMatrixf(lightprojmatrix, 0); glMultMatrixf(lightviewmatrix, 0); glGetFloatv(GL_MODELVIEW_MATRIX, shadowtexmatrix, 0); glPopMatrix(); } I obtained these matrices by using the glOrtho and gluLookAt procedures: glLoadIdentity() val wdt = width / 45 val hgt = height / 45 glOrtho(wdt, -wdt, -hgt, hgt, -45.0, 45.0) glGetFloatv(GL_MODELVIEW_MATRIX, lightprojmatrix, 0) glLoadIdentity() glu.gluLookAt( xlook + lightpos._1, ylook + lightpos._2, lightpos._3, xlook, ylook, 0.0f, 0.f, 0.f, 1.0f) glGetFloatv(GL_MODELVIEW_MATRIX, lightviewmatrix, 0) My bias matrix is: float[] biasmatrix = new float[16] { 0.5f, 0.f, 0.f, 0.f, 0.f, 0.5f, 0.f, 0.f, 0.f, 0.f, 0.5f, 0.f, 0.5f, 0.5f, 0.5f, 1.f } After applying the camera projection and view matrices, I do: glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR) glTexGenfv(GL_S, GL_EYE_PLANE, shadowtexmatrix, 0) glEnable(GL_TEXTURE_GEN_S) for each component. Does anybody know why the texture is not being rendered correctly? Thank you.

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• Smooth Camera Zoom Factor Change

  - by Siddharth

  I have game play scene in which user can zoom in and out. For which I used smooth camera in the following manner. public static final int CAMERA_WIDTH = 1024; public static final int CAMERA_HEIGHT = 600; public static final float MAXIMUM_VELOCITY_X = 400f; public static final float MAXIMUM_VELOCITY_Y = 400f; public static final float ZOOM_FACTOR_CHANGE = 1f; mSmoothCamera = new SmoothCamera(0, 0, Constants.CAMERA_WIDTH, Constants.CAMERA_HEIGHT, Constants.MAXIMUM_VELOCITY_X, Constants.MAXIMUM_VELOCITY_Y, Constants.ZOOM_FACTOR_CHANGE); mSmoothCamera.setBounds(0f, 0f, Constants.CAMERA_WIDTH, Constants.CAMERA_HEIGHT); But above thing create problem for me. When user perform zoom in and leave game play scene then other scene behaviour not look good. I already set zoom factor to 1 for this purpose. But now it show camera translation in other scene. Because scene switching time it so much small that player can easily saw translation of camera that I don't want to show. After camera reposition, everything works perfect but how to set camera its proper position. For example my loading text move from bottom to top or vice versa based on camera movement. Any more detail you want then I can able to give you.

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• Can't export Blender model for use in jMonkeyEngine SDK

  - by Nathan Sabruka

  I have a scene rendered in blender called "civ1.blend" which contains multiple materials (for example, I have one called "white"). I want to use this model in jMonkeyEngine, so I used the OGRE exporter to create .scene and .material files. This gives me, for example, a civ1.scene file and a white.material file.However, when I then try to import civ1.scene into the jMonkeyEngine SDK, I get an error along the lines of "Cannot find material file 'civ1.material'". Like I said, I have a white.material file, but I do not have a civ1.material file. Did anyone encounter this problem? How do I fix this?

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• Take a snapshot with JavaFX!

  - by user12610255

  JavaFX 2.2 has a "snapshot" feature that enables you to take a picture of any node or scene. Take a look at the API Documentation and you will find new snapshot methods in the javafx.scene.Scene class. The most basic version has the following signature: public WritableImage snapshot(WritableImage image) The WritableImage class (also introduced in JavaFX 2.2) lives in the javafx.scene.image package, and represents a custom graphical image that is constructed from pixels supplied by the application. In fact, there are 5 new classes in javafx.scene.image: PixelFormat: Defines the layout of data for a pixel of a given format. WritablePixelFormat: Represents a pixel format that can store full colors and so can be used as a destination format to write pixel data from an arbitrary image. PixelReader: Defines methods for retrieving the pixel data from an Image or other surface containing pixels. PixelWriter: Defines methods for writing the pixel data of a WritableImage or other surface containing writable pixels. WritableImage: Represents a custom graphical image that is constructed from pixels supplied by the application, and possibly from PixelReader objects from any number of sources, including images read from a file or URL. The API documentation contains lots of information, so go investigate and have fun with these useful new classes! -- Scott Hommel

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