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• Animate sprite/texture position with VBO

  - by Dono

  I'm currently worlking on a renderer for my projects and I want animate a sprite on screen. I've got a spritesheet but I don't know what is the the best way to update the texture coordinates for each vertex. Update vertices then update vertex buffer. (Heavy ?) Send to the shader my texture coordinates (It is possible ?) Don't use VBO ? By the way, I've got this structure : Object class with Geometry (Faces + Vertex + Buffer) and Material (Shader + other stuff ) properties, it is a good structure ? Thanks!

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• OpenGL ES 2.0. Sprite Sheet Animation

  - by Project Dumbo Dev

  I've found a bunch of tutorials on how to make this work on Open GL 1 & 1.1 but I can't find it for 2.0. I would work it out by loading the texture and use a matrix on the vertex shader to move through the sprite sheet. I'm looking for the most efficient way to do it. I've read that when you do the thing I'm proposing you are constantly changing the VBO's and that that is not good. Edit: Been doing some research myself. Came upon this two Updating Texture and referring to the one before PBO's. I can't use PBO's since i'm using ES version of OpenGL so I suppose the best way is to make FBO's but, what I still don't get, is if I should create a Sprite atlas/batch and make a FBO/loadtexture for each frame of if I should load every frame into the buffer and change just de texture directions.

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• Looking for feedback on design pattern for simple 2D environment

  - by Le Mot Juiced

  I'm working in iOS. I am trying to make a very simple 2D environment where there are some basic shapes you can drag around with your finger. These shapes should interact in various ways when dropped on each other, or when single-tapped versus double-tapped, etc. I don't know the name for the design pattern I'm thinking of. Basically, you have a bunch of arrays named after attributes, such as "double-tappable" or "draggable" or "stackable". You assign these attributes to the shapes by putting the shapes in the arrays. So, if there's a double-tap event, the code gets the location of it, then iterates through the "double-tappable" array to see if any of its members are in that location. And so on: every interactive event causes a scan through the appropriate array or arrays. It seems like that should work, but I'm wondering if there's a better pattern for the purpose.

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• Adding gesture recognizer (or dragging) to CCSprite

  - by user339946

  I'm trying to allow a CCSprite to be dragged across the screen. I've succeeded so far by doing it on a Layer level (from this tutorial). However, this only allows ONE sprite to be dragged at a time as the method implementation can only identify a single sprite to move at a time. I'd like to be able to perhaps add a gesture recognizer or somehow implement ccTouchesBegan/Moved in my own little CCSprite subclass. However, from what I understand, you can't just add gesture recognizers to CCSprites. ccTouchMoved are also not available on CCSprites?? Really confused as to how to implement touches on Cocos2D. What is the easiest way to add some position translation code to a CCSprite so it can be dragged around? Thanks!

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• Base on User Drawing Create Polygon Body as well Image

  - by Siddharth

  In my game, I want to provide a user with drawing feature. By free hand drawing user create a polygon shape. So in my game implementation I have to create body for all found vertices and I have to generate image based on that polygon shape. So my problem is how to create image that match the user provided vertices. In cocos2d I listen that there is an implementation of something like Image Masking. But I don't understand how that thing I implement in andengnine. Please provide any guidance on how to create image same as user generated polygon shape.

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• Letting the user draw a Polygon Body and Image

  - by Siddharth

  In my game, I want to provide the user with a drawing feature. By free hand drawing, the user creates a polygon shape. Then, in my game implementation, I have to create a body for the found vertices and generate an image based on that polygon shape. My problem is how to create an image that matches the user-provided vertices. I've heard that cocos2d has something called Image Masking. I don't understand how I could implement it in AndEngine. Could someone help?

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• Changing a Sprite When Hit in GameMaker

  - by Pixels_

  I am making a simple little Galaga style game. I want the objects sprite to change whenever it is hit. For example if a laser hits an alien then the sprite takes 1 out of 4 damage to its health points (HP). However I want the sprite to change from green to yellow after 1 hit, yellow to orange after 2 hits, orange to red after 3 hits, and red to pixel explosion after all 4 HPs are lost. That way you can easily distinguish the amount of health each alien has left. How can I do this? Preferably explain it in code.

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• sprite animation in openGL

  - by Sid

  I am facing problems on implementing sprite animation in opneGL ES. i've googled it and the only thing i am getting is the Tutorial implementing via Canvas. i know the way but i am having problems in implementing it. What i need : A sprite animation on collision detection. What i did : Collision Detection function working properly. PS : everything is working fine but i want to implement the animation in OPENGL ONLY. Canvas won't work in my case.

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• Move sprite in the direction it is facing?

  - by rphello101

  I'm using Java/Slick 2D. I'm trying to use the mouse to rotate the sprite and the arrow keys to move the sprite. I can get the sprite to rotate no problem, but I cannot get it to move in the direction it is supposed to. When I hit "forwards", the sprite doesn't necessarily move towards the mouse. I'm sure there has to be some standard code for this since many games use this style of motion. Can anyone help me out with what the trig is supposed to be? Thanks

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• Scaling sprite velocity / co-ordinatesin Android

  - by user22241

  I'm trying to find the answer to a question that I've had for a long time, but am having trouble finding it! I hope someone can help :-) I'm trying to find information on how to scale sprite velocity / movement / co-ordinates. What I mean by this is how do I get a sprite to move at the same speed relative to the screen size / DPI so that it takes the same amount of real-time to get from one side of the screen to the other? All of the posts pertaining to sprite scaling that I can find on the various forums relate to the size of the sprite, but this part of it I'm OK with so far, it's just that when I move a sprite, it kind of gets there at different speed depending on the dpi / resolution of the device. I hope I'm making sense. This is the code I have so far, instead of using explicit amounts, like 1, I'm using something like the following: platSpeedFloat= (1 * (dpi/160)); //Use '1' so on an MDPI screen, the sprite will move by 1 physical pixel Then basically what I'm doing is something like this: (all varialble previously declared) platSpeedSave+=platSpeedFloat; //Add the platSpeedFloat value to the current platSpeedSave value platSpeed=(int) platSpeedSave; //Cast to int so it can be checked in the following statement if (platSpeed==platSpeedSave) //Check the casted int value to float value stored previoiusly {floorY=floorY-platSpeed; //If they match then change the Y value platSpeedSave=0;} //Reset Would be grateful if someone could assists - hope I'm making sense. The above doesn't seems to work the sprite moves 'faster' on lower DPI screens. Thanks

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• XNA - How do I change the texture of a 2D object?

  - by Adorjan

  I am on to make a table game, I successfully figured out how to make the arraw and to move the cursor on it (by tiles). Now I wanna find out how to make that if I hit the Enter key the tile's texture change to another. I tryed like this: if (input.KeyPressed(Keys.Enter)) { cell[X,Y].Cell_texture = tile_texture; } but it doesn't really work. Hope you can help. :) Thanks!

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• Where i set touch effect when a spawn Srite are comming on the screen?

  - by shihab_returns

  I just create a scene where create a spawn spirit that comes from above screen height in Landscape mode. Now i want to remove spirits when i touch on it. I tried but seems the code not works and crashed also after a while. here is my code: /** TimerHandler for collision detection and cleaning up */ IUpdateHandler detect = new IUpdateHandler() { @Override public void reset() { } @Override public void onUpdate(float pSecondsElapsed) { Iterator<AnimatedSprite> targets = targetLL.iterator(); AnimatedSprite _target; while (targets.hasNext()) { _target = targets.next(); if (_target.getY() >= cameraHeight) { // removeSprite(_target, targets); tPool.recyclePoolItem(_target); targets.remove(); Log.d("ok", "---------Looop Inside-----"); // fail(); break; } } targetLL.addAll(TargetsToBeAdded); TargetsToBeAdded.clear(); } }; /** adds a target at a random location and let it move along the y-axis */ public void addTarget() { Random rand = new Random(); int minX = mTargetTextureRegion.getWidth(); int maxX = (int) (mCamera.getWidth() - mTargetTextureRegion.getWidth()); int rangeX = maxX - minX; Log.d("----point----", "minX:" + minX + "maxX:" + maxX + "rangeX:" + rangeX); int rX = rand.nextInt(rangeX) + minX; int rY = (int) mCamera.getHeight() + mTargetTextureRegion.getHeight(); Log.d("---Random x----", "Random x" + rX + "Random y" + rY); target = tPool.obtainPoolItem(); target.setPosition(rX, rY); target.animate(100); mMainScene.attachChild(target, 1); mMainScene.registerTouchArea(target); int minDuration = 2; int maxDuration = 32; int rangeDuration = maxDuration - minDuration; int actualDuration = rand.nextInt(rangeDuration) + minDuration; // MoveXModifier mod = new MoveXModifier(actualDuration, target.getX(), // -target.getWidth()); MoveYModifier mody = new MoveYModifier(actualDuration, -target.getHeight(), cameraHeight + 10); target.registerEntityModifier(mody.deepCopy()); TargetsToBeAdded.add(target); } @Override public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final ITouchArea pTouchArea, final float pTouchAreaLocalX, final float pTouchAreaLocalY) { if (pTouchArea == target) { Toast.makeText(getApplicationContext(), "Yoooooooo", Toast.LENGTH_LONG).show(); } return true; } ** My question is where i implements IOnAreaTouchListener in My code. ? ** Thanks in Advance.

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• How do you set the movement speed of a sprite?

  - by rphello101

  I'm using Slick 2D/Java to play around with graphics. Getting an image to move is easy: Input input = gc.getInput(); if(input.isKeyDown(sprite.up)){ sprite.y--; }else if (input.isKeyDown(sprite.down)){ sprite.y++; }else if (input.isKeyDown(sprite.left)){ sprite.x--; }else if (input.isKeyDown(sprite.right)){ sprite.x++; } However, this is called on every update, so if you hold up, the sprite moves to the edge of the screen in a few hundred milliseconds. Since coordinates are integers, I can't add less than 1 to slow the sprite down. I'm assuming I must have to implement a timer of some sort or something. Any advice?

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• Sprite.js surface background

  - by user1086671

  I'm making a tile-based game using Sprite.js. It is not easy to redraw every tile each frame, so I tried to make a scrolling surface background. There is an example here http://batiste.dosimple.ch/sprite.js/tests/test_scrolling.html The example works, but it seems like ScrollingSurface.update is buggy or there is something I'm missing. What I tried to do is to draw 5x5 tiles and after 5 seconds draw another 5x5 tiles near the first ones. But it draws only the first ones. And surface.update() only updates the position of surface. Here is my code https://github.com/Sektoid/sprite.js/blob/master/tests/test_scrolling.html (You need also to set this.divider = 1.0 in scrolling.js to avoid drawing the same tiles 4 times.) There aren't any sprite.js-forums like with the other sprite- and game-engines have, so I'm asking here.

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• j2me sprite array

  - by danis

  I`ve tried to put the same Image into an array (array contains 22 Images) to form inventory. for(int i=0;i>22;i++){ invSprite[i] = new Sprite(ingame); invSprite[i].defineReferencePixel(0,0); } and if(inventory){ for(int i=0;i>22;i++){ if(i>=11){ invSprite[i].setRefPixelPosition(0+15*i, 27); }else{ invSprite[i].setRefPixelPosition(0+15*i, 42); } invSprite[i].paint(g); } } If the inventory is on it will show those Images but it`s not. PS if I would try invSprite[0].setRefPixelPosition(10, 27); invSprite[0].paint(g); it would throw an java/lang/NullPointerException

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• 60K+ Sprites on the 360?

  - by Jeffrey Kern

  Hey everyone, Just wondering - throwing ideas in my head - about starting a new XNA project for the 360. I would like it to be retro-old school, and emulating scanlines and color palettes and such. As part of this idea, what I would ideally like to do is manually draw each and every pixel of the screen. So, worst-case scenario I would have to draw about 60K sprites on a 252x240 resolution (I think thats correct). 60K sprites on the screen at a time. So, before I even attempt to code this - would the XBOX 360 be able to keep up with this even? That is a lot of sprites, but they aren't big sprites, and the texture data needed would be non-existant. However, I guess how this project would be implemented would make it or break it, but all I was thinking was coming up with a 2D array and mapping which color value would need to be drawn at that point. Of course, this is watered down talk right now. But what you all suggest? EDIT: Each sprite would represent one pixel. E.g., a sprite at 0,0. Another at 0,1. etc.

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• Updating multiple Sprites - AS3 performance best practices

  - by dani

  Within the container "BubbleContainer" I have multiple "Bubble sprites". Each bubble's graphics object (a circle) is updated on a timer event. Let's say I have 50 Bubble sprites and each circle's radius should be updated with a mathematical formula. How do I organize this logic? How do I update all Bubble sprites within the BubbleContainer? (should I call a bubble.update() function or make a temporary reference to the graphics object?) Where do I put the Math logic? (as static functions?)

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• What is the correct way to implement hit detection with non-rectangular sprites?

  - by hogni89

  What is the correct way to implement hit or touch detection for non-rectangular sprites in Cocos2d? I am working on a jigsaw puzzle, so our sprites have some strange forms (jigsaw puzzle bricks). As of now, we have implemented the "detection" this way: - (void)selectSpriteForTouch:(CGPoint)touchLocation { CCSprite * newSprite = nil; // Loop array of sprites for (CCSprite *sprite in movableSprites) { // Check if sprite is hit. // TODO: Swap if with something better. if (CGRectContainsPoint(sprite.boundingBox, touchLocation)) { newSprite = sprite; break; } } if (newSprite != selSprite) { // Move along, nothing to see here // Not the problem } } - (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event { CGPoint touchLocation = [self convertTouchToNodeSpace:touch]; [self selectSpriteForTouch:touchLocation]; return TRUE; } I know that the problem is in the keyword "sprite.boundingBox". Is there a better way of implementing this, or is it a limitation when using sprites based on .png's? If so, how should I proceed?

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• creating 2d sprites for games ?

  - by dfafa

  i am pretty new to developing games...i thought i would begin by making a simple 2d game.... curious what tools are commonly used to transform images to pixel sprites ? or is this done by hand, if so what tools are used ? even better, is there a marketplace where i can purchase game sprites and other game assets ?

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• Jekyll - How to approach asset processing (minification, spriting...)

  - by Gromix

  I recently switched to Jekyll and I find the conversion pipeline works really well. However I'm stuck on which approach to take when the process is many inputs to one output (ex: concatenating CSS files, creating image sprites...) I know several tools that can do it, that can be called either from the command line or in Ruby code directly. For ex: Jammit css sprites Compass sprites My current solution is a few Jekyll plugins that call these tools. However, it has the following problems: 1. SASS files should be processed, then concatenated/minified SASS-CSS is a Converter, and the concatenation is a Generator run on the output. Unfortunately generators are run first, which means the concatenation is always a step behind (I have to run the build twice) 2. Jekyll does not know about the source/output relationship With converters, when I run Jekyll in server mode, if I change a SASS file it automatically runs the conversion to CSS. When dealing with concatenation/spriting, I haven't found a way to do the same. I end up having to run a "normal" Jekyll build (not server auto) to update the concatenated files and sprites. Thanks for any ideas!

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• Trying to create a group of button sprites

  - by user1449653

  Good day, I have like 15 images I need to be buttons. I have buttons working with a Box() (Box - looks like this) class Box(pygame.sprite.Sprite): def __init__(self): pygame.sprite.Sprite.__init__(self) self.image = pygame.Surface((35, 30)) self.image = self.image.convert() self.image.fill((255, 0, 0)) self.rect = self.image.get_rect() self.rect.centerx = 25 self.rect.centery = 505 self.dx = 10 self.dy = 10 I am trying to make the buttons work with image sprites. So I attempted to copy the class style of the box and do the same for my Icons.. code looks like this... class Icons(pygame.sprite.Sprite): def __init__(self): pygame.sprite.Sprite.__init__(self) self.image = pygame.image.load("images/airbrushIC.gif").convert() self.rect = self.image.get_rect() self.rect.x = 25 self.rect.y = 550 the code in the main() rect = image.get_rect() rect.x = 25 rect.y = 550 ic1 = Icons((screen.get_rect().x, screen.get_rect().y)) screen.blit(ic1.image, ic1.rect) pygame.display.update() This code produces a positional (accepts 1 argument but 2 are there) error or an image is not referenced error (inside the Icon class). I'm unsure if this is the right way to go about this anyways.. I know for sure that I need to load all the images (as sprites)... store them in an array... and then have my mouse check if it is clicking one of the items in the array using a for loop. Thanks. EDIT QUESTION 2: class Icons(pygame.sprite.Sprite): def init(self, *args): pygame.sprite.Sprite.init(self, *args) self.image = pygame.image.load("images/airbrushIC.gif").convert() self.rect = self.image.get_rect() ic1 = self.image self.rect.x = 10 self.rect.y = 490 self.image = pygame.image.load("images/fillIC.gif").convert() self.rect = self.image.get_rect() ic2 = self.image self.rect.x = 10 self.rect.y = 540 Thanks to your help I got the Icons class loading ONE image. Its not loading both. Obviously because its being overwritten by the second one. It seems that "class" for this purpose isn't what I need. Which begs the question how I make sprites outside of a class.. If there is a way to make the class work please let me know.

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• CSS Sprite techniques, css background or img's clip

  - by Viktor

  Hi, There are two image sprite techniques. The "classic" version uses the background and the background-position css properties. (as it's described here http://www.alistapart.com/articles/sprites) The "second" version uses an image tag and it's clip css property. (http://css-tricks.com/css-sprites-with-inline-images/) My question is that are there advantages of using the "second" version over the "classic" version? thanks and best, Viktor

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• How can we detect a touch of a sprite?

  - by srikanth rongali

  I have two sprites in my app. Both should have touches enabled and both touches are independent of one another. And if I touch the screen (not on sprites) it should have different touches. My problem is all three sprite1, sprite2, remaining screen should have independent touches. But my program is taking all the touches as same. How can I make them as what I needed ? Thank You.

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• CSS Sprites : Mysterious Concept Explored ?

  - by Rachel

  I have 3 different images and now I want to create an sprite using css so that I am reducing HTTP Request. I am totally new to this concept and have not idea as to how to approach this. Can anyone suggest me what would be best bet for me ? Also I have seen there are some CSS Sprite generator engines where in you submit .zip folder containing your images and than they would combine it. I tried doing that but did not understood of what was happening and so any guidance regarding creating and using CSS sprites would be highly appreciated. Update: I have gone through the AList Part but it was not very clear to me. Can anyone explain the use case of CSS Sprites using an example ? Thanks.

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• AS3 Memory Conservation (Loaders/BitmapDatas/Bitmaps/Sprites)

  - by rinogo

  I'm working on reducing the memory requirements of my AS3 app. I understand that once there are no remaining references to an object, it is flagged as being a candidate for garbage collection. Is it even worth it to try to remove references to Loaders that are no longer actively in use? My first thought is that it is not worth it. Here's why: My Sprites need perpetual references to the Bitmaps they display (since the Sprites are always visible in my app). So, the Bitmaps cannot be garbage collected. The Bitmaps rely upon BitmapData objects for their data, so we can't get rid of them. (Up until this point it's all pretty straightforward). Here's where I'm unsure of what's going on: Does a BitmapData have a reference to the data loaded by the Loader? In other words, is BitmapData essentially just a wrapper that has a reference to loader.content, or is the data copied from loader.content to BitmapData? If a reference is maintained, then I don't get anything by garbage collecting my loaders... Thoughts?

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