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POSprite Animation Management Using Threads
 

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    <p>I'm in the process of creating my own two-dimensional game. Every object in the game world has a Sprite object, and when the screen is drawn, the object's sprite is drawn in the object's location.</p> <p>The sprite class can be either a single image or a series of images used to make an animates sprite.</p> <pre><code>import java.awt.image.BufferedImage; import java.awt.Graphics2D; public class Sprite implements Runnable{ private int currentImage; private BufferedImage[] sprites; private int delayMS; private Thread animation; public Sprite(BufferedImage sprite){ sprites = new BufferedImage[1]; sprites[0] = sprite; } public Sprite(BufferedImage[] spriteAnimation,int delay){ this.sprites = spriteAnimation; currentImage = 0; delayMS = delay; //start a thread to time animation animation = new Thread(this); animation.start(); } private void next(){ if(currentImage &lt; sprites.length - 1) currentImage++; else currentImage = 0; } public void run() { while (Thread.currentThread() == animation) { //delay the animation for delayMS try { Thread.sleep(delayMS); } catch (InterruptedException e) { break; } //next image next(); } } public void draw(Graphics2D g,int x,int y){ g.drawImage(sprites[currentImage],null,x,y); } } </code></pre> <p>I couldn't find any reliable information on the subject of using threads to run many animations, and I was wondering whether this was the best approach. Everything works great until I throw 200ish identical objects into the world. FPS begins to lower and some animated sprites begin to change frames at different times. This would make sense since the threads would start to delay when instantiated.</p> <p>My questions is whether there is a more efficient way to handle this, allowing me to use more objects without significant FPS loss, and synchronize the thread/threads so that the animations switch frames together.</p>
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    1. COAre you using Swing?
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    2. COi don't know about animation, but i do know about threading. you must make the currentImage member var volatile so that updates will be seen between the various threads. also, starting a Thread in a constructor is almost always a bad design (if i ever want to subclass this class, the Thread will start before the class is fully constructed). use a static helper method to create the class and start the thread (after fully constructed).
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