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  • If statement causing xna sprites to draw frame by frame

    - by user1489599
    I’m a bit new to XNA but I wanted to write a simple program that would fire a cannon ball from a cannon at a 45 degree angle. It works fine outside of my keyboard i/o if statement, but when I encapsulate the code around an if statement checking to see if the user hits the space bar, the sprite will draw one frame at a time every time the space bar is hit. This is the code in question if (currentKeyboardState.IsKeyUp(Keys.Space) && previousKeyboardState.IsKeyDown(Keys.Space) && !skullBall.Alive) { //works outside the keyboard input if statement //{ skullBall.Position = cannon.Position; skullBall.DeltaY = -(float)(Math.Sin(MathHelper.ToRadians(45)) * 50/*39.7577*/ * time + 0.5 * (gravity * (time * time))); skullBall.DeltaX = (float)(Math.Cos(MathHelper.ToRadians(45)) * 50/*39.7577*/ * time); skullBall.Alive = true; //} } The skull ball represents the cannon ball and the cannon is just the starting point. DeltaX and DeltaY are the values I’m using to update the cannon balls position per update. I know it's dumb to have the cannon ball start at the cannons position every time the update is called but it’s not really noticeable right now. I was wondering if after examining my code, if anyone noticed any errors that would cause the sprite to display frame by frame instead of drawing it as a full animation of the cannon ball leaving the cannon and moving from there.

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  • Collision and Graphics integration

    - by Shlomi Atia
    I'm a little confused about the integration between collision and graphics. They both need to share the same position in the world. The most obvious choice is the center of the entity, which is good for bounding volumes and fixed sized sprites. However, for characters with variable height size sprites like this: http://gamemedia.wcgame.ru/data/2011-07-17/game-sprite-sheet.jpg This is no longer good. The character won't align to the ground if I'll draw it from the center. I can just make the sprites the same height, but it will be a waste of memory (the largest sprite is 4 times larger then the smallest one). Even then, this is not an option at all with skeletal sprites like this one: http://user-generated-content.java-gaming.org/img-vault/212a171fc1ebb27ab77608fb9b2dd9bd9205361ce6300b21a7f8d06d025fbbd8.png It seems that the graphics need to be drawn from the ground for characters, but not for other images such as scenery and obstacles. The only solution I could think of was having another position called draw-position, which is the entity center for images, and is the the bottom of the collision volume for characters. Then when I draw relative to that position, it should work properly. I haven't found any references for something like that, so I'm kinda insecure about it. Does anyone knows of a better approach for this problem? Thanks

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  • What is causing these visual artifacts on my OpenGL sprites?

    - by Amplify91
    What could be the cause of the defects in my characters sprite? I am using OpenGL ES 2.0. I draw my sprites in a sprite batch that uses UV coordinates from one large texture atlas. If you look around the character' edges, you'll see two noticeable problems: The invisible alpha background is not invisible, but shows a strange static-like background. There are unwanted streaks where the character nears the edge of the frame (but only in some frames of the animation, this happened to be one of them). Any idea what could be causing these? I will provide related code if asked for, but I'll try to avoid just dumping the entire project and expecting someone to look through it all. EDIT: Here's a bit of code: This is how I generate my UV coordinates: private float[] createFrameUV(int frameWidth, int frameHeight, int x, int y){ float[] uv = new float[4]; if(numberOfFrames>1){ float width = (float)frameWidth / (float)mBitmap.getWidth(); float height = (float)frameHeight / (float)mBitmap.getHeight(); float u = (float)x / (float)mBitmap.getWidth(); float v = (float)y / (float)mBitmap.getHeight(); uv[0] = u; uv[1] = v; uv[2] = u + width; uv[3] = v + height; }else{ uv[0] = 0f; uv[1] = 0f; uv[2] = 1f; uv[3] = 1f; } return uv; } These are some OpenGL settings: GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);

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  • Create indefinitely oscillating pendulum in Farseer Physics 3.3.1/Box2d

    - by GONeale
    I am new to Farseer Physics and using version 3.3.1. I am after some help and would even be happy to receive Box2d answers just to ensure I get a response as I should then be able to convert it! -- Thanks ...After a lot of tinkering around I have managed to produce a thin vertical rectangle shape on the screen and I wish this to swing back and forth pinned at the top up to an angle I set (90 degrees would be fine for this sample). When it is approaching the top I wish it to slow down, then fall back the way it just came, increase speed then obviously slow to a stop at the top again. Almost how a swinging pirate ship would work at a theme park. This is the code I have so far which swings the shape, but it is seeming to lose speed on each swing eventually grinding to a halt: float playerWidth = ConvertUnits.ToSimUnits(5), playerHeight = ConvertUnits.ToSimUnits(68); playerPosition = ConvertUnits.ToSimUnits(-350, 0); playerBody = BodyFactory.CreateRectangle(World, playerWidth, playerHeight, 2f, playerPosition); playerBody.BodyType = BodyType.Dynamic; // create player sprite based on player body _rectangleSprite = new Sprite(ScreenManager.Assets.TextureFromShape(playerBody.FixtureList[0].Shape, MaterialType.Player, Color.Orange, 1f)); // Create swinging joint var joint = JointFactory.CreateFixedRevoluteJoint(World, playerBody, ConvertUnits.ToSimUnits(0, -34), playerBody.Position); If somebody could also provide the command I would need to pause the shape on a mouse click or keyboard command at it's current angle and then continue when I let go of the mouse click that would be super fantastic! (I actually posted this on StackOverflow as well before I realised there was a dedicated game development forum) Cheers

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  • How do I scroll in the physical world?

    - by Esteban Quintero
    I am using andengine to make a game where a sprite (player) is going up across the stage, this is my world. final Rectangle ground = new Rectangle(0, CAMERA_HEIGHT - 2, CAMERA_WIDTH, 2, vertexBufferObjectManager); final Rectangle roof = new Rectangle(0, 0, CAMERA_WIDTH, 2, vertexBufferObjectManager); final Rectangle left = new Rectangle(0, 0, 2, CAMERA_HEIGHT, vertexBufferObjectManager); final Rectangle right = new Rectangle(CAMERA_WIDTH - 2, 0, 2, CAMERA_HEIGHT, vertexBufferObjectManager); final FixtureDef wallFixtureDef = PhysicsFactory.createFixtureDef(0, 0.5f, 0.5f); PhysicsFactory.createBoxBody(this.mPhysicsWorld, ground, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, roof, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, left, BodyType.StaticBody, wallFixtureDef); PhysicsFactory.createBoxBody(this.mPhysicsWorld, right, BodyType.StaticBody, wallFixtureDef); /* Create two sprits and add it to the scene. */ this.mScene.setBackground(autoParallaxBackground); this.mScene.attachChild(ground); this.mScene.attachChild(roof); this.mScene.attachChild(left); this.mScene.attachChild(right); this.mScene.registerUpdateHandler(this.mPhysicsWorld); The problem is that if the sprite reaches up and hits the wall, as I scroll here?

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  • Application toolkits like QT versus traditional game/multimedia libraries like SFML

    - by Aaron
    I currently intend to use SFML for my next game project. I'll need a substantial GUI though (RPG/strategy-type) so I'll either have to implement my own or try to find an appropriate third party library, which seem to boil down to CEGUI, libRocket, and GWEN. At the same time, I do not anticipate doing that many advanced graphical effects. My game will be 2D and primarily sprite-based with some sprite animations. I've recently discovered that QT applications can have their appearance styled so that they don't have to look like plain OS apps. Given that, I am beginning to consider QT a valid alternative to SFML. I wouldn't have to implement the GUI functionality I'd need, and I may not be taking advantage of SFML's lower-level access anyway. The only drawbacks I can think of immediately are the learning curve for QT and figuring out how to fit game logic inside such a framework after getting used to the input/update/render loop of traditional game libraries. When would an application toolkit like QT be more appropriate for a game than a traditional game or multimedia library like SFML?

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  • How to remove a box2d body when collision happens?

    - by Ayham
    I’m still new to java and android programming and I am having so much trouble Removing an object when collision happens. I looked around the web and found that I should never handle removing BOX2D bodies during collision detection (a contact listener) and I should add my objects to an arraylist and set a variable in the User Data section of the body to delete or not and handle the removing action in an update handler. So I did this: First I define two ArrayLists one for the faces and one for the bodies: ArrayList<Sprite> myFaces = new ArrayList<Sprite>(); ArrayList<Body> myBodies = new ArrayList<Body>(); Then when I create a face and connect that face to its body I add them to their ArrayLists like this: face = new AnimatedSprite(pX, pY, pWidth, pHeight, this.mBoxFaceTextureRegion); Body BoxBody = PhysicsFactory.createBoxBody(mPhysicsWorld, face, BodyType.DynamicBody, objectFixtureDef); mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(face, BoxBody, true, true)); myFaces.add(face); myBodies.add(BoxBody); now I add a contact listener and an update handler in the onloadscene like this: this.mPhysicsWorld.setContactListener(new ContactListener() { private AnimatedSprite face2; @Override public void beginContact(final Contact pContact) { } @Override public void endContact(final Contact pContact) { } @Override public void preSolve(Contact contact,Manifold oldManifold) { } @Override public void postSolve(Contact contact,ContactImpulse impulse) { } }); scene.registerUpdateHandler(new IUpdateHandler() { @Override public void reset() { } @Override public void onUpdate(final float pSecondsElapsed) { } }); My plan is to detect which two bodies collided in the contact listener by checking a variable from the user data section of the body, get their numbers in the array list and finally use the update handler to remove these bodies. The questions are: Am I using the arraylist correctly? How to add a variable to the User Data (the code please). I tried removing a body in this update handler but it still throws me NullPointerException , so what is the right way to add an update handler and where should I add it. Any other advices to do this would be great. Thanks in advance.

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  • this.BoundingBox.Intersects(Wall[0].BoundingBox) not working properly

    - by Pieter
    I seem to be having this problem a lot, I'm still learning XNA / C# and well, trying to make a classic paddle and ball game. The problem I run into (and after debugging have no answer) is that everytime I run my game and press either of the movement keys, the Paddle won't move. Debugging shows that it never gets to the movement part, but I can't understand why not? Here's my code: // This is the If statement for checking Left movement. if (keyboardState.IsKeyDown(Keys.Left) || keyboardState.IsKeyDown(Keys.A)) { if (!CheckCollision(walls[0])) { Location.X -= Velocity; } } //This is the CheckCollision(Wall wall) boolean public bool CheckCollision(Wall wall) { if (this.BoundingBox.Intersects(wall.BoundingBox)) { return true; } return false; } As far as I can tell there should be absolutely no problem with this, I initialize the bounding box in the constructor whenever a new instance of Walls and Paddle is created. this.BoundingBox = new Rectangle(0, 0, Sprite.Width, Sprite.Height); Any idea as to why this isn't working? I have previously succeeded with using the whole Location.X < Wall.Location.X + Wall.Texture.Width code... But to me that seems like too much coding if a simple boolean check could be done.

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  • cocos2d event handler not fired when reentering scene

    - by Adam Freund
    I am encountering a very strange problem with my cocos2d app. I add a sprite to the page and have an event handler linked to it which replaces the scene with another scene. On that page I have another button to take me back to the original scene. When I am back on the original scene, the eventHandler doesn't get fired when I click on the sprite. Below is the relevant code. Thanks for any help! CCMenuItemImage *backBtnImg = [CCMenuItemImage itemWithNormalImage:@"btn_back.png" selectedImage:@"btn_back_pressed.png" target:self selector:@selector(backButtonTapped:)]; backBtnImg.position = ccp(45, 286); CCMenu *backBtn = [CCMenu menuWithItems:backBtnImg, nil]; backBtn.position = CGPointZero; [self addChild:backBtn]; EventHandler method (doesn't get called when the scene is re-entered). (void)backButtonTapped:(id)sender { NSLog(@"backButtonTapped\n"); CCMenuItemImage *backButton = (CCMenuItemImage *)sender; [backButton setNormalImage:[CCSprite spriteWithFile:@"btn_back_pressed.png"]]; [[CCDirector sharedDirector] replaceScene:[CCTransitionFade transitionWithDuration:.25 scene:[MenuView scene] withColor:ccBLACK]]; }

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  • How do I draw a dotted or dashed line?

    - by Gagege
    I'm trying to draw a dashed or dotted line by placing individual segments(dashes) along a path and then separating them. The only algorithm I could come up with for this gave me a dash length that was variable based on the angle of the line. Like this: private function createDashedLine(fromX:Float, fromY:Float, toX:Float, toY:Float):Sprite { var line = new Sprite(); var currentX = fromX; var currentY = fromY; var addX = (toX - fromX) * 0.0075; var addY = (toY - fromY) * 0.0075; line.graphics.lineStyle(1, 0xFFFFFF); var count = 0; // while line is not complete while (!lineAtDestination(fromX, fromY, toX, toY, currentX, currentY)) { /// move line draw cursor to beginning of next dash line.graphics.moveTo(currentX, currentY); // if dash is even if (count % 2 == 0) { // draw the dash line.graphics.lineTo(currentX + addX, currentY + addY); } // add next dash's length to current cursor position currentX += addX; currentY += addY; count++; } return line; } This just happens to be written in Haxe, but the solution should be language neutral. What I would like is for the dash length to be the same no matter what angle the line is. As is, it's just adding 75 thousandths of the line length to the x and y, so if the line is and a 45 degree angle you get pretty much a solid line. If the line is at something shallow like 85 degrees then you get a nice looking dashed line. So, the dash length is variable, and I don't want that. How would I make a function that I can pass a "dash length" into and get that length of dash, no matter what the angle is? If you need to completely disregard my code, be my guest. I'm sure there's a better solution.

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  • CCSpriteHole in cocos2d 2.0?

    - by rakkarage
    i was using this cocos2d class CCSpriteHole in cocos2d 1.0 fine... http://jpsarda.tumblr.com/post/15779708304/new-cocos2d-iphone-extensions-a-progress-bar-and-a i am trying to convert it to cocos2d 2.0... i got it to compile by changing glVertexPointer to glVertexAttribPointer like in the 2.0 version of CCSpriteScale9 here http://jpsarda.tumblr.com/post/9162433577/scale9grid-for-cocos2d and changing contentSizeInPixels_ to contentSize_... -(id) init { if( (self=[super init]) ) { opacityModifyRGB_ = YES; opacity_ = 255; color_ = colorUnmodified_ = ccWHITE; capSize=capSizeInPixels=CGSizeZero; //Not used blendFunc_.src = CC_BLEND_SRC; blendFunc_.dst = CC_BLEND_DST; // update texture (calls updateBlendFunc) [self setTexture:nil]; // default transform anchor anchorPoint_ = ccp(0.5f, 0.5f); vertexDataCount=24; vertexData = (ccV2F_C4F_T2F*) malloc(vertexDataCount * sizeof(ccV2F_C4F_T2F)); [self setTextureRectInPixels:CGRectZero untrimmedSize:CGSizeZero]; } return self; } -(id) initWithTexture:(CCTexture2D*)texture rect:(CGRect)rect { NSAssert(texture!=nil, @"Invalid texture for sprite"); // IMPORTANT: [self init] and not [super init]; if( (self = [self init]) ) { [self setTexture:texture]; [self setTextureRect:rect]; } return self; } -(id) initWithTexture:(CCTexture2D*)texture { NSAssert(texture!=nil, @"Invalid texture for sprite"); CGRect rect = CGRectZero; rect.size = texture.contentSize; return [self initWithTexture:texture rect:rect]; } -(id) initWithFile:(NSString*)filename { NSAssert(filename!=nil, @"Invalid filename for sprite"); CCTexture2D *texture = [[CCTextureCache sharedTextureCache] addImage: filename]; if( texture ) return [self initWithTexture:texture]; return nil; } +(id)spriteWithFile:(NSString*)f { return [[self alloc] initWithFile:f]; } - (void) dealloc { if (vertexData) free(vertexData); } -(void) updateColor { ccColor4F color4; color4.r=(float)color_.r/255.0f; color4.g=(float)color_.g/255.0f; color4.b=(float)color_.b/255.0f; color4.a=(float)opacity_/255.0f; for (int i=0; i<vertexDataCount; i++) { vertexData[i].colors=color4; } } -(void)updateTextureCoords:(CGRect)rect { CCTexture2D *tex = texture_; if(!tex) return; float atlasWidth = (float)tex.pixelsWide; float atlasHeight = (float)tex.pixelsHigh; float left,right,top,bottom; left = rect.origin.x/atlasWidth; right = left + rect.size.width/atlasWidth; top = rect.origin.y/atlasHeight; bottom = top + rect.size.height/atlasHeight; // // |/|/|/| // CGSize capTexCoordsSize=CGSizeMake(capSizeInPixels.width/atlasWidth, capSizeInPixels.height/atlasHeight); // From left to right //Top band // Left vertexData[0].texCoords=(ccTex2F){left,top}; vertexData[1].texCoords=(ccTex2F){left,top+capTexCoordsSize.height}; vertexData[2].texCoords=(ccTex2F){left+capTexCoordsSize.width,top}; vertexData[3].texCoords=(ccTex2F){left+capTexCoordsSize.width,top+capTexCoordsSize.height}; // Center vertexData[4].texCoords=(ccTex2F){right-capTexCoordsSize.width,top}; vertexData[5].texCoords=(ccTex2F){right-capTexCoordsSize.width,top+capTexCoordsSize.height}; // Right vertexData[6].texCoords=(ccTex2F){right,top}; vertexData[7].texCoords=(ccTex2F){right,top+capTexCoordsSize.height}; //Center band // Left vertexData[8].texCoords=(ccTex2F){left,bottom-capTexCoordsSize.height}; vertexData[9].texCoords=(ccTex2F){left,top+capTexCoordsSize.height}; vertexData[10].texCoords=(ccTex2F){left+capTexCoordsSize.width,bottom-capTexCoordsSize.height}; vertexData[11].texCoords=(ccTex2F){left+capTexCoordsSize.width,top+capTexCoordsSize.height}; // Center vertexData[12].texCoords=(ccTex2F){right-capTexCoordsSize.width,bottom-capTexCoordsSize.height}; vertexData[13].texCoords=(ccTex2F){right-capTexCoordsSize.width,top+capTexCoordsSize.height}; // Right vertexData[14].texCoords=(ccTex2F){right,bottom-capTexCoordsSize.height}; vertexData[15].texCoords=(ccTex2F){right,top+capTexCoordsSize.height}; //Bottom band //Left vertexData[16].texCoords=(ccTex2F){left,bottom}; vertexData[17].texCoords=(ccTex2F){left,bottom-capTexCoordsSize.height}; vertexData[18].texCoords=(ccTex2F){left+capTexCoordsSize.width,bottom}; vertexData[19].texCoords=(ccTex2F){left+capTexCoordsSize.width,bottom-capTexCoordsSize.height}; // Center vertexData[20].texCoords=(ccTex2F){right-capTexCoordsSize.width,bottom}; vertexData[21].texCoords=(ccTex2F){right-capTexCoordsSize.width,bottom-capTexCoordsSize.height}; // Right vertexData[22].texCoords=(ccTex2F){right,bottom}; vertexData[23].texCoords=(ccTex2F){right,bottom-capTexCoordsSize.height}; } -(void) updateVertices { float left=0; //-spriteSizeInPixels.width*0.5f; float right=left+contentSize_.width; float bottom=0; //-spriteSizeInPixels.height*0.5f; float top=bottom+contentSize_.height; float holeLeft=holeRect.origin.x*CC_CONTENT_SCALE_FACTOR(); float holeRight=holeLeft+holeRect.size.width*CC_CONTENT_SCALE_FACTOR(); float holeBottom=holeRect.origin.y*CC_CONTENT_SCALE_FACTOR(); float holeTop=holeBottom+holeRect.size.height*CC_CONTENT_SCALE_FACTOR(); // // |/|/|/| // // From left to right //Top band // Left vertexData[0].vertices=(ccVertex2F){left,top}; vertexData[1].vertices=(ccVertex2F){left,holeTop}; vertexData[2].vertices=(ccVertex2F){holeLeft,top}; vertexData[3].vertices=(ccVertex2F){holeLeft,holeTop}; // Center vertexData[4].vertices=(ccVertex2F){holeRight,top}; vertexData[5].vertices=(ccVertex2F){holeRight,holeTop}; // Right vertexData[6].vertices=(ccVertex2F){right,top}; vertexData[7].vertices=(ccVertex2F){right,holeTop}; //Center band // Left vertexData[8].vertices=(ccVertex2F){left,holeBottom}; vertexData[9].vertices=(ccVertex2F){left,holeTop}; vertexData[10].vertices=(ccVertex2F){holeLeft,holeBottom}; vertexData[11].vertices=(ccVertex2F){holeLeft,holeTop}; // Center vertexData[12].vertices=(ccVertex2F){holeRight,holeBottom}; vertexData[13].vertices=(ccVertex2F){holeRight,holeTop}; // Right vertexData[14].vertices=(ccVertex2F){right,holeBottom}; vertexData[15].vertices=(ccVertex2F){right,holeTop}; //Bottom band //Left vertexData[16].vertices=(ccVertex2F){left,bottom}; vertexData[17].vertices=(ccVertex2F){left,holeBottom}; vertexData[18].vertices=(ccVertex2F){holeLeft,bottom}; vertexData[19].vertices=(ccVertex2F){holeLeft,holeBottom}; // Center vertexData[20].vertices=(ccVertex2F){holeRight,bottom}; vertexData[21].vertices=(ccVertex2F){holeRight,holeBottom}; // Right vertexData[22].vertices=(ccVertex2F){right,bottom}; vertexData[23].vertices=(ccVertex2F){right,holeBottom}; } -(void) setHole:(CGRect)r inRect:(CGRect)totalSurface { holeRect=r; self.contentSize=totalSurface.size; holeRect.origin=ccpSub(holeRect.origin,totalSurface.origin); CGPoint holeCenter=ccp(holeRect.origin.x+holeRect.size.width*0.5f,holeRect.origin.y+holeRect.size.height*0.5f); self.anchorPoint=ccp(holeCenter.x/contentSize_.width,holeCenter.y/contentSize_.height); //[self updateTextureCoords:rectInPixels_]; [self updateVertices]; [self updateColor]; } -(void) draw { BOOL newBlend = NO; if( blendFunc_.src != CC_BLEND_SRC || blendFunc_.dst != CC_BLEND_DST ) { newBlend = YES; glBlendFunc( blendFunc_.src, blendFunc_.dst ); } glBindTexture(GL_TEXTURE_2D, [texture_ name]); glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[0].vertices); glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[0].texCoords); glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[0].colors); glDrawArrays(GL_TRIANGLE_STRIP, 0, 8); glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[8].vertices); glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[8].texCoords); glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[8].colors); glDrawArrays(GL_TRIANGLE_STRIP, 0, 8); glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[16].vertices); glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[16].texCoords); glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_FLOAT, GL_FALSE, sizeof(ccV2F_C4F_T2F), &vertexData[16].colors); glDrawArrays(GL_TRIANGLE_STRIP, 0, 8); if( newBlend ) glBlendFunc(CC_BLEND_SRC, CC_BLEND_DST); } -(void)setTextureRectInPixels:(CGRect)rect untrimmedSize:(CGSize)untrimmedSize { rectInPixels_ = rect; rect_ = CC_RECT_PIXELS_TO_POINTS( rect ); //[self setContentSizeInPixels:untrimmedSize]; [self updateTextureCoords:rectInPixels_]; } -(void)setTextureRect:(CGRect)rect { CGRect rectInPixels = CC_RECT_POINTS_TO_PIXELS( rect ); [self setTextureRectInPixels:rectInPixels untrimmedSize:rectInPixels.size]; } // // RGBA protocol // #pragma mark CCSpriteHole - RGBA protocol -(GLubyte) opacity { return opacity_; } -(void) setOpacity:(GLubyte) anOpacity { opacity_ = anOpacity; // special opacity for premultiplied textures if( opacityModifyRGB_ ) [self setColor: (opacityModifyRGB_ ? colorUnmodified_ : color_ )]; [self updateColor]; } - (ccColor3B) color { if(opacityModifyRGB_){ return colorUnmodified_; } return color_; } -(void) setColor:(ccColor3B)color3 { color_ = colorUnmodified_ = color3; if( opacityModifyRGB_ ){ color_.r = color3.r * opacity_/255; color_.g = color3.g * opacity_/255; color_.b = color3.b * opacity_/255; } [self updateColor]; } -(void) setOpacityModifyRGB:(BOOL)modify { ccColor3B oldColor = self.color; opacityModifyRGB_ = modify; self.color = oldColor; } -(BOOL) doesOpacityModifyRGB { return opacityModifyRGB_; } #pragma mark CCSpriteHole - CocosNodeTexture protocol -(void) updateBlendFunc { if( !texture_ || ! [texture_ hasPremultipliedAlpha] ) { blendFunc_.src = GL_SRC_ALPHA; blendFunc_.dst = GL_ONE_MINUS_SRC_ALPHA; [self setOpacityModifyRGB:NO]; } else { blendFunc_.src = CC_BLEND_SRC; blendFunc_.dst = CC_BLEND_DST; [self setOpacityModifyRGB:YES]; } } -(void) setTexture:(CCTexture2D*)texture { // accept texture==nil as argument NSAssert( !texture || [texture isKindOfClass:[CCTexture2D class]], @"setTexture expects a CCTexture2D. Invalid argument"); texture_ = texture; [self updateBlendFunc]; } -(CCTexture2D*) texture { return texture_; } @end but now positioning and scaling seem to not work? and it starts in the wrong position... but changing the opacity still works. so i was wondering if anyone can see why my 2.0 version is not working? or if maybe there is a better way to do a sprite hole with cocos2d/opengl 2.0? shaders? thanks

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  • How can I replicate the look and limitations of the Super NES?

    - by Mikalichov
    I am looking to produce graphics with the same limitations / look that in the Super Nes era. I am specifically looking for graphics similar to Chrono Trigger / FF6. It would be a lot easier to do if I had an idea of the resolution / dpi I am supposed to use. I found that the technical specs for the SNES are: Progressive: 256 × 224, 512 × 224, 256 × 239, 512 × 239 Interlaced: 512 × 448, 512 × 478 But even by using these resolutions, it is pointless if I set it at 72dpi, as I will still have possibly very detailed graphics (that is the main thing, I don't want detailed graphics, I want to go pixelated). I figured it might be related to the sprite size limit, i.e.: Sprites can be 8 × 8, 16 × 16, 32 × 32, or 64 × 64 pixels, each using one of eight 16-color palettes and tiles from one of two blocks of 256 in VRAM. Up to 32 sprites and 34 8 × 8 sprite tiles may appear on any one line. This would work for sprites (characters, objects), but what about maps? Are they built entirely from 8x8 tiles? And then, at what resolution is the end result displayed? It might seem like I am giving the question and answers at the same time, but all of these are suppositions I am making, so could someone confirm or correct them?

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  • XNA 2D Spritesheet drawing rendering problem

    - by user24092
    I'm making a tile-based game, using one spritesheet containing all tile graphics. Each tile has a size of 32x32 pixels. The main problem is: when I draw the tile to the screen, if the tile position x and y are not rounded or if scale is activated in spriteBatch.Draw() method (scale != 1.0f), I get some lines of adjacent tiles on the spritesheet into the current tile drawed. I already tried setting SamplerState to PointClamp, removing AntiAlias, but still doesn't work. Here I'll show images of some tests that I made, with a test sprite sheet that I've created (I made a 9x9 spritesheet, with each sprite of size 32x32 containing a unique solid color). Tests: http://img6.imageshack.us/img6/5946/testsqj.png SpriteSheet used: http://imageshack.us/a/img821/1341/tilesm.png Already tried to remove anti-alias, set PointClamp as sampler state, but still getting this issue, XNA keeps drawing part of the adjacent pixels of the texture on the screen. What I want is to get the correct area of the tilesheet texture (as seen in the first test, that gets just the yellow pixels). My question is: Is there any way that I can fix this, WITHOUT adding tile spacing or any other modification involving the tilesheet? Maybe disabling a texture filtering that is done by XNA, or something like that.

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  • On Screen Coin Animation

    - by Siddharth
    am working with side scrolling skater game. I want to perform coin animation such that as player collect coin it moves upside and attach with currency sprite. My main character and coin present in game scene and currency sprite present in HUD layer. This situation creates problem for me. Directly I can not apply modifier to coin because it is side scrolling game so based on main character speed it reaches at different position. That I have checked. So that I have to generate other coin at same position at game layer coin has, in HUD layer and move upward to it. But I didn't able to get its y position correct though I can able to get x position correctly. Many time main character goes downward so it get minus value many time. I also tried following code float[] position = GameHUD.this .convertSceneCoordinatesToLocalCoordinates(GameManager .getInstance().getCoinX(), GameManager.getInstance() .getCoinY()); But I am getting same coordinate as I provide. No difference in that so please some one provide me guidance in that. Because I am near to complete my game. EDIT: Here game layer and hud layer is totally different. Actual coin present in game layer which player has to collect and at same position I want to generate another coin in hud layer to perform some animation. It is recommended to generate coin in hud layer because through that only I can able to complete my target.

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  • Failing Screen Resize Method

    - by StrongJoshua
    So I want my game to draw to a specific "optimal" size and then be stretched to fit screens that are a different size. I'm using LibGDX and figured that I could just draw everything to a FrameBuffer and then resize that buffer to the appropriate size when drawing it to the actual display. However, my method does not work, it just results in a black screen with the top right quarter of the screen white.Intermediary is the FBO, interMatrix is a Matrix4 object, and camera is an OrthographicCamera. @Override public void render() { // update actors currentStage.act(); //render to intermediary buffer batch.setProjectionMatrix(interMatrix); intermediary.begin(); batch.begin(); currentStage.draw(); batch.flush(); intermediary.end(); //resize to actual width and height Sprite s = new Sprite(intermediary.getColorBufferTexture()); s.flip(true, false); batch.setProjectionMatrix(camera.combined); batch.draw(s.getTexture(), 0, 0, width, height); batch.end(); } These are the constructors for the above mentioned objects (GAME_WIDTH and HEIGHT are the "optimal" settings, width and height are the actual sizes, which are the same when running on desktop). intermediary = new FrameBuffer(Format.RGBA8888, GAME_WIDTH, GAME_HEIGHT, false); interMatrix = new Matrix4(); camera = new OrthographicCamera(width, height); interMatrix.setToOrtho2D(0, 0, GAME_WIDTH, GAME_HEIGHT); Is there a better way of doing this or can is this a viable option and how do I fix what I have?

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  • How can I make smoother upwards/downwards controls in pygame?

    - by Zolani13
    This is a loop I use to interpret key events in a python game. # Event Loop for event in pygame.event.get(): if event.type == QUIT: pygame.quit() sys.exit() if event.type == pygame.KEYDOWN: if event.key == pygame.K_a: my_speed = -10; if event.key == pygame.K_d: my_speed = 10; if event.type == pygame.KEYUP: if event.key == pygame.K_a: my_speed = 0; if event.key == pygame.K_d: my_speed = 0; The 'A' key represents up, while the 'D' key represents down. I use this loop within a larger drawing loop, that moves the sprite using this: Paddle1.rect.y += my_speed; I'm just making a simple pong game (as my first real code/non-gamemaker game) but there's a problem between moving upwards <= downwards. Essentially, if I hold a button upwards (or downwards), and then press downwards (or upwards), now holding both buttons, the direction will change, which is a good thing. But if I then release the upward button, then the sprite will stop. It won't continue in the direction of my second input. This kind of key pressing is actually common with WASD users, when changing directions quickly. Few people remember to let go of the first button before pressing the second. But my program doesn't accommodate the habit. I think I understand the reason, which is that when I let go of my first key, the KEYUP event still triggers, setting the speed to 0. I need to make sure that if a key is released, it only sets the speed to 0 if another key isn't being pressed. But the interpreter will only go through one event at a time, I think, so I can't check if a key has been pressed if it's only interpreting the commands for a released key. This is my dilemma. I want set the key controls so that a player doesn't have to press one button at a time to move upwards <= downwards, making it smoother. How can I do that?

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  • Crash when trying to detect touch

    - by iQue
    I've got a character in a 2D game using surfaceView that I want to be able to move using a button (eventually a joystick), but my game crashes as soon as I try to move my sprite. This is my onTouch-method for my steering button: public void handleActionDown(int eventX, int eventY) { if (eventX >= (x - bitmap.getWidth() / 2) && (eventX <= (x + bitmap.getWidth()/2))) { if (eventY >= (y - bitmap.getHeight() / 2) && (y <= (y + bitmap.getHeight() / 2))) { setTouched(true); } else { setTouched(false); } } else { setTouched(false); } And if I try to put this in my update-method: public void update() { x += (speed.getXv() * speed.getxDirection()); y += (speed.getYv() * speed.getyDirection()); } The sprite moves on its own just fine, but as soon as I add: public void update() { if(steering.isTouched()){ x += (speed.getXv() * speed.getxDirection()); y += (speed.getYv() * speed.getyDirection()); } the game crashes. Does anyone know why this is or how to fix it? I cannot figure it out. I'm using MotionEvent.ACTION_DOWN to check if the user if pressing the screen.

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  • List has no value after adding values in

    - by Sigh-AniDe
    I am creating a a ghost sprite that will mimic the main sprite after 10 seconds of the game. I am storing the users movements in a List<string> and i am using a foreach loop to run the movements. The problem is when i run through the game by adding breakpoints the movements are being added to the List<string> but when the foreach runs it shows that the list has nothing in it. Why does it do that? How can i fix it? this is what i have: public List<string> ghostMovements = new List<string>(); public void UpdateGhost(float scalingFactor, int[,] map) { // At this foreach, ghostMovements has nothing in it foreach (string s in ghostMovements) { // current position of the ghost on the tiles int mapX = (int)(ghostPostition.X / scalingFactor); int mapY = (int)(ghostPostition.Y / scalingFactor); if (s == "left") { switch (ghostDirection) { case ghostFacingUp: angle = 1.6f; ghostDirection = ghostFacingRight; Program.form.direction = ""; break; case ghostFacingRight: angle = 3.15f; ghostDirection = ghostFacingDown; Program.form.direction = ""; break; case ghostFacingDown: angle = -1.6f; ghostDirection = ghostFacingLeft; Program.form.direction = ""; break; case ghostFacingLeft: angle = 0.0f; ghostDirection = ghostFacingUp; Program.form.direction = ""; break; } } } } // The movement is captured here and added to the list public void captureMovement() { ghostMovements.Add(Program.form.direction); }

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  • How to swap row/column major order?

    - by 0X1A
    I'm trying to get a sprite sheet clipped in the right order but I'm a bit stumped, every iteration I've tried has tended to be in the wrong order. This is my current implementation. Frames = (TempSurface->h / ClipHeight) * (TempSurface->w / ClipWidth); SDL_Rect Clips[Frames]; for (i = 0; i < Frames; i++) { if (i != 0 && i % (TempSurface->h / ClipHeight) == 0) ColumnIndex++; Clips[i].x = ColumnIndex * ClipWidth; Clips[i].y = i % (TempSurface->h / ClipHeight) * ClipHeight; Clips[i].w = ClipWidth; Clips[i].h = ClipHeight; } Where TempSurface is the entire sheet loaded to a SDL_Surface and Clips[] is an array of SDL_Rects. What results from this is a sprite sheet set to SDL_Rects in the wrong order. For example I need a sheet of dimensions 4x4 to look like this: | 0 | 1 | 2 | 3 | | 4 | 5 | 6 | 7 | | 8 | 9 | 10| 11| | 12| 13| 14| 15| But instead I get this order: | 0 | 4 | 8 | 12| | 1 | 5 | 9 | 13| | 2 | 6 | 10| 14| | 3 | 7 | 11| 15| Columns and rows order does not match. What should I do to fix the order?

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  • Farseer circle hangs where it's spawned

    - by necrosmash
    I'm currently trying to simply spawn a circle in Farseer. However, it's stuck wherever I spawn it! The game is updating fine, as I can see the circle spinning in place when I spawn it because of how I currently have gravity set up (following code from Game1.cs): // Initialise the screen center for use with // the Level class screenCenter = new Vector2(graphics.GraphicsDevice.Viewport.Width / 2f, graphics.GraphicsDevice.Viewport.Height / 2f); world = new World(new Vector2(20, 20)); currentLevel = new Level1(screenCenter, circleSprite, groundSprite, ref world); Level1 constructor: public Level1(Vector2 screenCenter, Texture2D circleSprite, Texture2D groundSprite, ref World world) { player = new Player(ref world, screenCenter, circleSprite); ground = new Ground(ref world, screenCenter, groundSprite); listLevelItems = new List<LevelItem>(); listLevelItems.Add(player); listLevelItems.Add(ground); } Player constructor: public Player(ref World world, Vector2 screenCenter, Texture2D sprite) { setSprite(sprite); setPosition((screenCenter / MeterInPixels) + new Vector2(0f, 0f)); playerBody = BodyFactory.CreateCircle(world, 96f / (2f * MeterInPixels), 1f, playerPosition); getBody().BodyType = BodyType.Dynamic; // Ball bounce and friction getBody().Restitution = 0.3f; getBody().Friction = 0.5f; } If I use a breakpoint and change the playerBody position while the game is halted, the ball does move, but stays fixed in its new location. Any help would be greatly appreciated.

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  • Best way to generate pieces in match-3 games, and then tracking them?

    - by JonLim
    I've been working on a match-3 style game in Actionscript using Flixel, and so far, I've been able to build the core mechanics of the game, including board generation, piece generation, piece swapping and movement, and checking algorithms. However, I am now running into issues with clearing out pieces and letting the above pieces fall down and generating new pieces. The reason I'm running into these issues is that when all of the pieces are generated, the pertinent values (position, sprite ID, and sprite object) are pushed into an array that helps me track everything, all the time. When pieces are moved, I swap the values of the corresponding arrays and life goes on. And that array is the core of my problem: if a row in the middle of the board clears out, ideally, all of the pieces above the cleared pieces should fall down to take their place and new pieces are generated at the top and also fall into place. Except if I try to do that now, all the pieces can fall down, but then I'd have to bump all of their values into the right arrays (oh god my head) and then generate new pieces and fit THOSE into the correct place in the array. Am I overthinking this? Or is there a far better way to track these pieces? Thanks guys!

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  • XNA Notes 007

    - by George Clingerman
    Every week I keep wondering if there’s going to be enough activity in the community to keep doing these notes on a weekly basis and every week I’m reminded of just how awesome and active the XNA community is. There’s engines being made, tutorials being created, games being crafted. There’s information being shared, questions being answered and then there’s another whole community around the Xbox LIVE Indie Games themselves. It’s really incredibly to just watch all that’s going on and I’m glad I’m playing a small part in all of this. So here’s what I noticed happening in the XNA community last week. If there’s things I’m missing, always feel free to let me know. I love learning about new corners of the XNA community that I wasn’t aware of or just have been missing! XNA Developers: Uditha Bandara held an XNA Game Development Workshops at Singapore Universities http://uditha.wordpress.com/2011/02/18/xna-game-development-workshops-at-singapore-universities-event-update/ Binary Tweed gives his talks about Indie City and gives his opinion on the false promise of digital distribution http://www.develop-online.net/news/37053/OPINION-The-false-promise-of-digital-distribution Kris Steele posts his Trivia or Die postmortem http://www.krissteele.net/blogdetails.aspx?id=246 @MadNinjaSkills (James Johnston) posts his feelings on testing for XBLIG http://www.ezmuze.co.uk/101 Simon (@DDReaper) posts hints and tips for XNA developers to help get the size of their projects down http://twitter.com/#!/DDReaper/status/38279440924545024 http://xna-uk.net/blogs/darkgenesis/archive/2011/02/17/look-at-the-size-of-that-thing.aspx Michael B. McLaughlin proving why he should be an XNA MVP posts the list of commonly used value types in XNA games http://geekswithblogs.net/mikebmcl/archive/2011/02/17/list-of-commonly-used-value-types-in-xna-games.aspx http://twitter.com/#!/mikebmcl/status/38166541354811392 Paul Powell (@ITSligoPaul) posts about a common sprite batch as a game service http://itspaulsblog.blogspot.com/2011/02/xna-common-sprite-batch-as-game-service.html @SigilXNA (John Defenbaugh) posts his new level editor video for the sequel to Opac’s Journey http://twitter.com/SigilXNA/statuses/36548174373982209 http://twitter.com/#!/SigilXNA/status/36548174373982209 http://youtu.be/QHbmxB_2AW8 @jwatte updates kW Animation for XNA 4.0 http://www.enchantedage.com/xna-animation @DSebJ posts Blender to SunBurn http://twitter.com/#!/DSebJ/status/36564920224976896 http://dsebj.evolvingsoftware.com/?p=187 Ads and WP7 Games - @mechaghost shares his revenue data for his ad based games http://www.occasionalgamer.com/2011/02/09/ads-and-wp7-games/ Xbox LIVE Indie Games (XBLIG): Steven Hurdle posts day 100 of his quest to find a fantastic XBLIG purchase every day http://writingsofmassdeduction.com/2011/02/17/day-100-radiangames-ballistic/ Xbox 360 Indie Game Buying Guide - 12 games for $60 including several Xbox LIVE Indie games! (although if the XNA community was asked we could have recommended 60 games for $60...) http://www.indiegamemag.com/xbox360-indie-games-buying-guide/ The best selling Xbox LIVE Indie games of 2010 http://www.1up.com/news/xbox-live-most-popular-games I’d buy that for a dollar! - the California Literary Review points out a few gems on the XBLIG marketplace (and other places) where you can game on the cheap. http://calitreview.com/14125 Armless Octopus Episode 39 - The Indie Gem Octocast http://www.armlessoctopus.com/2011/02/17/armless-octocast-episode-39-the-indie-gem-octocast/ Ska Studios posts a plethora of updates http://www.ska-studios.com/2011/02/11/good-morning-gato-49/ http://www.ska-studios.com/2011/02/14/vampire-smile-valentines/ http://www.ska-studios.com/2011/02/16/the-dishwasher-vs-finds-a-home/ Kotaku posts about the Xbox LIVE Indie Game that makes you go Pew Pew Pew Pew Pew Pew http://kotaku.com/#!5760632/the-game-that-makes-you-go-pew-pew-pew-pew-pew-pew-pew GameMarx continues to be active and doing a ton for the XBLIG community reviews and Top 5 indie games of the week 2/4-2/10 http://www.gamemarx.com/video/the-show/22/ep-9-february-11-2010.aspx a new podcast Xbox Indie New Releases http://twitter.com/#!/gamemarx/status/36888849107910656 http://www.gamemarx.com/news/2011/02/13/a-new-podcast-xbox-indie-new-releases.aspx @MasterBlud uploads Indocalypse XBLIG Collections #2 http://www.youtube.com/watch?v=uzCZSv075mc&feature=youtu.be&a http://twitter.com/#!/MasterBlud/status/37100029697064960 Just Press Start interviews Michael Hicks from MichaelArts, 18 year old creator of Honor in Vengeance http://justpressstart.net/?p=465 Achievement Locked interviews Kris Steele of FunInfused Games http://xboxindies.wordpress.com/2011/02/11/interview-fun-infused-games/ XNA Game Development: XNA -UK launches their XAP test service to help the XNA community http://xna-uk.net/blogs/news/archive/2011/02/18/xna-uk-xap-test-service-now-live.aspx Transmute shows off a video of the standard character editor http://www.youtube.com/watch?v=qqH6gErG948&feature=youtu.be Microsoft Tech Student introduces their first tech student of the month.  Meet Daniel Van Tassel from the University of Utah and learn how he created an Xbox LIVE Indie Game using XNA Studio http://blogs.msdn.com/b/techstudent/archive/2010/12/22/introducing-our-first-tech-student-of-the-month-daniel-van-tassel.aspx XNA for Silverlight Developers Part 3 - Animation (transforms) http://www.silverlightshow.net/items/XNA-for-Silverlight-developers-Part-3-Animation-transforms.aspx XNA for Silverlight Developers Part 4 - Animation (frame based) http://www.silverlightshow.net/items/XNA-for-Silverlight-developers-Part-4-Animation-frame-based.aspx @suhinini tweets about an XNA Sprite Font generation tool http://twitter.com/#!/suhinini/status/36841370131890176 http://www.nubik.com/SpriteFont/ XNATouch 1.5 is out and in it’s words is faster, simpler, more reliable and has the XNA 4.0 API http://monogame.codeplex.com/releases/view/60815 IndieCity is hosting marketing workshops for Indie Developers (UK and US) http://forums.create.msdn.com/forums/p/75197/457654.aspx#457654 New York Students - Learn XNA and Silverlight for Xbox 360 and Windows Phone 7 http://forums.create.msdn.com/forums/p/72753/456964.aspx#456964 http://blogs.msdn.com/b/andrewparsons/archive/2011/01/13/learn-to-build-your-own-games-for-xbox-360-and-windows-phone-7.aspx http://blogs.msdn.com/b/andrewparsons/archive/2011/01/13/build-a-game-in-48-hours-win-a-kinect-or-windows-phone-7.aspx Extra Credits: Videogame Music http://www.escapistmagazine.com/videos/view/extra-credits/2019-Videogame-Music Steve Pavlina posts an article with useful information for all XNA/XBLIG developers http://www.stevepavlina.com/blog/2011/02/completion-vs-perfection/

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  • Data Binding to Attached Properties

    - by Chris Gardner
    Originally posted on: http://geekswithblogs.net/freestylecoding/archive/2013/06/14/data-binding-to-attached-properties.aspx When I was working on my C#/XAML game framework, I discovered I wanted to try to data bind my sprites to background objects. That way, I could update my objects and the draw functionality would take care of the work for me. After a little experimenting and web searching, it appeared this concept was an impossible dream. Of course, when has that ever stopped me? In my typical way, I started to massively dive down the rabbit hole. I created a sprite on a canvas, and I bound it to a background object. <Canvas Name="GameField" Background="Black"> <Image Name="PlayerStrite" Source="Assets/Ship.png" Width="50" Height="50" Canvas.Left="{Binding X}" Canvas.Top="{Binding Y}"/> </Canvas> Now, we wire the UI item to the background item. public MainPage() { this.InitializeComponent(); this.Loaded += StartGame; }   void StartGame( object sender, RoutedEventArgs e ) { BindingPlayer _Player = new BindingPlayer(); _Player.X = Window.Current.Bounds.Height - PlayerSprite.Height; _Player.X = ( Window.Current.Bounds.Width - PlayerSprite.Width ) / 2.0; } Of course, now we need to actually have our background object. public class BindingPlayer : INotifyPropertyChanged { private double m_X; public double X { get { return m_X; } set { m_X = value; NotifyPropertyChanged(); } }   private double m_Y; public double Y { get { return m_Y; } set { m_Y = value; NotifyPropertyChanged(); } }   public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged( [CallerMemberName] string p_PropertyName = null ) { if( PropertyChanged != null ) PropertyChanged( this, new PropertyChangedEventArgs( p_PropertyName ) ); } } I fired this baby up, and my sprite was correctly positioned on the screen. Maybe the sky wasn't falling after all. Wouldn't it be great if that was the case? I created some code to allow me to move the sprite, but nothing happened. This seems odd. So, I start debugging the application and stepping through code. Everything appears to be working. Time to dig a little deeper. After much profanity was spewed, I stumbled upon a breakthrough. The code only looked like it was working. What was really happening is that there was an exception being thrown in the background thread that I never saw. Apparently, the key call was the one to PropertyChanged. If PropertyChanged is not called on the UI thread, the UI thread ignores the call. Actually, it throws an exception and the background thread silently crashes. Of course, you'll never see this unless you're looking REALLY carefully. This seemed to be a simple problem. I just need to marshal this to the UI thread. Unfortunately, this object has no knowledge of this mythical UI Thread in which we speak. So, I had to pull the UI Thread out of thin air. Let's change our PropertyChanged call to look this. public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged( [CallerMemberName] string p_PropertyName = null ) { if( PropertyChanged != null ) Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync( Windows.UI.Core.CoreDispatcherPriority.Normal, new Windows.UI.Core.DispatchedHandler( () => { PropertyChanged( this, new PropertyChangedEventArgs( p_PropertyName ) ); } ) ); } Now, we raised our notification on the UI thread. Everything is fine, people are happy, and the world moves on. You may have noticed that I didn't await my call to the dispatcher. This was intentional. If I am trying to update a slew of sprites, I don't want thread being hung while I wait my turn. Thus, I send the message and move on. It is worth nothing that this is NOT the most efficient way to do this for game programming. We'll get to that in another blog post. However, it is perfectly acceptable for a business app that is running a background task that would like to notify the UI thread of progress on a periodic basis. It is worth noting that this code was written for a Windows Store App. You can do the same thing with WP8 and WPF. The call to the marshaler changes, but it is the same idea.

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  • returning correct multiTouch id

    - by Max
    I've spent countless hours on reading tutorials and looking at every question related to multiTouch from here and Stackoverflow. But I just cannot figure out how to do this correctly. I use a loop to get my pointerId, I dont see alot of people doing this but its the only way I've managed to get it somewhat working. I have two joysticks on my screen, one for moving and one for controlling my sprites rotation and the angle he shoots, like in Monster Shooter. Both these work fine. My problem is that when I Move my sprite at the same time as Im shooting, my touchingPoint for my movement is set to the touchingPoint of my shooting, since the x and y is higher on the touchingPoint of my shooting (moving-stick on left side of screen, shooting-stick on right side), my sprite speeds up, this creates an unwanted change in speed for my sprite. I will post my entire onTouch method here with some variable-changes to make it more understandable. Since I do not know where Im going wrong. public void update(MotionEvent event) { if (event == null && lastEvent == null) { return; } else if (event == null && lastEvent != null) { event = lastEvent; } else { lastEvent = event; } int pointerCount = event.getPointerCount(); for (int i = 0; i < pointerCount; i++) { int x = (int) event.getX(i); int y = (int) event.getY(i); int id = event.getPointerId(i); int action = event.getActionMasked(); int actionIndex = event.getActionIndex(); String actionString; switch (action) { case MotionEvent.ACTION_DOWN: actionString = "DOWN"; break; case MotionEvent.ACTION_UP: shooting=false; // when shooting is true, it shoots dragging=false; // when dragging is true, it moves actionString = "UP"; break; case MotionEvent.ACTION_POINTER_DOWN: actionString = "PNTR DOWN"; break; case MotionEvent.ACTION_POINTER_UP: shooting=false; dragging=false; actionString = "PNTR UP"; break; case MotionEvent.ACTION_CANCEL: shooting=false; dragging=false; actionString = "CANCEL"; break; case MotionEvent.ACTION_MOVE: try{ if((int) event.getX(id) > 0 && (int) event.getX(id) < touchingBox && (int) event.getY(id) > touchingBox && (int) event.getY(id) < view.getHeight()){ movingPoint.x = (int) event.getX(id); movingPoint.y = (int) event.getY(id); dragging = true; } else if((int) event.getX(id) > touchingBox && (int) event.getX(id) < view.getWidth() && (int) event.getY(id) > touchingBox && (int) event.getY(id) < view.getHeight()){ shootingPoint.x = (int) event.getX(id); shootingPoint.y = (int) event.getY(id); shooting=true; }else{ shooting=false; dragging=false; } }catch(Exception e){ } actionString = "MOVE"; break; default: actionString = ""; } Wouldnt post this much code if I wasnt at an absolute loss of what I'm doing wrong. I simply can not get a good understanding of how multiTouching works. basicly movingPoint changes for both my first and second finger. I bind it to a box, but aslong as I hold one finger within this box, it changes its value based on where my second finger touches. It moves in the right direction and nothing gives an error, the problem is the speed-change, its almost like it adds up the two touchingPoints.

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  • Web optimization

    - by hmloo
    1. CSS Optimization Organize your CSS code Good CSS organization helps with future maintainability of the site, it helps you and your team member understand the CSS more quickly and jump to specific styles. Structure CSS code For small project, you can break your CSS code in separate blocks according to the structure of the page or page content. for example you can break your CSS document according the content of your web page(e.g. Header, Main Content, Footer) Structure CSS file For large project, you may feel having too much CSS code in one place, so it's the best to structure your CSS into more CSS files, and use a master style sheet to import these style sheets. this solution can not only organize style structure, but also reduce server request./*--------------Master style sheet--------------*/ @import "Reset.css"; @import "Structure.css"; @import "Typography.css"; @import "Forms.css"; Create index for your CSS Another important thing is to create index at the beginning of your CSS file, index can help you quickly understand the whole CSS structure./*---------------------------------------- 1. Header 2. Navigation 3. Main Content 4. Sidebar 5. Footer ------------------------------------------*/ Writing efficient CSS selectors keep in mind that browsers match CSS selectors from right to left and the order of efficiency for selectors 1. id (#myid) 2. class (.myclass) 3. tag (div, h1, p) 4. adjacent sibling (h1 + p) 5. child (ul > li) 6. descendent (li a) 7. universal (*) 8. attribute (a[rel="external"]) 9. pseudo-class and pseudo element (a:hover, li:first) the rightmost selector is called "key selector", so when you write your CSS code, you should choose more efficient key selector. Here are some best practice: Don't tag-qualify Never do this:div#myid div.myclass .myclass#myid IDs are unique, classes are more unique than a tag so they don't need a tag. Doing so makes the selector less efficient. Avoid overqualifying selectors for example#nav a is more efficient thanul#nav li a Don't repeat declarationExample: body {font-size:12px;}h1 {font-size:12px;font-weight:bold;} since h1 is already inherited from body, so you don't need to repeate atrribute. Using 0 instead of 0px Always using #selector { margin: 0; } There’s no need to include the px after 0, removing all those superfluous px can reduce the size of your CSS file. Group declaration Example: h1 { font-size: 16pt; } h1 { color: #fff; } h1 { font-family: Arial, sans-serif; } it’s much better to combine them:h1 { font-size: 16pt; color: #fff; font-family: Arial, sans-serif; } Group selectorsExample: h1 { color: #fff; font-family: Arial, sans-serif; } h2 { color: #fff; font-family: Arial, sans-serif; } it would be much better if setup as:h1, h2 { color: #fff; font-family: Arial, sans-serif; } Group attributeExample: h1 { color: #fff; font-family: Arial, sans-serif; } h2 { color: #fff; font-family: Arial, sans-serif; font-size: 16pt; } you can set different rules for specific elements after setting a rule for a grouph1, h2 { color: #fff; font-family: Arial, sans-serif; } h2 { font-size: 16pt; } Using Shorthand PropertiesExample: #selector { margin-top: 8px; margin-right: 4px; margin-bottom: 8px; margin-left: 4px; }Better: #selector { margin: 8px 4px 8px 4px; }Best: #selector { margin: 8px 4px; } a good diagram illustrated how shorthand declarations are interpreted depending on how many values are specified for margin and padding property. instead of using:#selector { background-image: url(”logo.png”); background-position: top left; background-repeat: no-repeat; } is used:#selector { background: url(logo.png) no-repeat top left; } 2. Image Optimization Image Optimizer Image Optimizer is a free Visual Studio2010 extension that optimizes PNG, GIF and JPG file sizes without quality loss. It uses SmushIt and PunyPNG for the optimization. Just right click on any folder or images in Solution Explorer and choose optimize images, then it will automatically optimize all PNG, GIF and JPEG files in that folder. CSS Image Sprites CSS Image Sprites are a way to combine a collection of images to a single image, then use CSS background-position property to shift the visible area to show the required image, many images can take a long time to load and generates multiple server requests, so Image Sprite can reduce the number of server requests and improve site performance. You can use many online tools to generate your image sprite and CSS, and you can also try the Sprite and Image Optimization framework released by The ASP.NET team.

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