public SpriteAnimation(String imageFile, int numFrames, int ticksPerFrame) {
try {
// Load the raw frames into a frame buffer
GreenfootImage baseImg = new GreenfootImage(imageFile);
GreenfootImage[] baseFrames = new GreenfootImage[numFrames];
int frameWidth = baseImg.getWidth() / numFrames;
int frameHeight = baseImg.getHeight();
BufferedImage rawImg = baseImg.getAwtImage();
for (int x = 0; x < numFrames; x++) {
baseFrames[x] = new GreenfootImage(frameWidth, frameHeight);
baseFrames[x]
.getAwtImage()
.setData(rawImg.getSubimage(x * frameWidth, 0, frameWidth, frameHeight).getData());
}
// Re-use object references to save from copying the images multiple times
frames = new GreenfootImage[numFrames * ticksPerFrame];
flipped = new GreenfootImage[numFrames * ticksPerFrame];
for (int f = 0; f < numFrames; f++) {
for (int t = 0; t < ticksPerFrame; t++) {
frames[f * ticksPerFrame + t] = baseFrames[f];
flipped[f * ticksPerFrame + t] = new GreenfootImage(baseFrames[f]);
flipped[f * ticksPerFrame + t].mirrorHorizontally();
}
}
} catch (IllegalArgumentException e) {
frames = flipped = new GreenfootImage[1];
frames[0] = ERROR_IMAGE;
}
}
/** Load the images */
private void loadImages() {
GifDecoder decode = new GifDecoder();
decode.read(file);
int numFrames = decode.getFrameCount();
if (numFrames > 0) {
images = new GreenfootImage[numFrames];
delay = new int[numFrames];
} else {
images = new GreenfootImage[1];
images[0] = new GreenfootImage(1, 1);
}
for (int i = 0; i < numFrames; i++) {
GreenfootImage image =
new GreenfootImage(decode.getFrame(i).getWidth(), decode.getFrame(i).getHeight());
BufferedImage frame = image.getAwtImage();
Graphics2D g = (Graphics2D) frame.getGraphics();
g.drawImage(decode.getFrame(i), null, 0, 0);
delay[i] = decode.getDelay(i);
images[i] = image;
}
time = System.currentTimeMillis();
}