/**
* Get the current image in the animation sequence. This will change over time.
*
* @return The current image
*/
public GreenfootImage getCurrentImage() {
long delta = System.currentTimeMillis() - time;
while (delta >= delay[currentIndex] && !pause) {
delta -= delay[currentIndex];
time += delay[currentIndex];
currentIndex = (currentIndex + 1) % images.length;
}
return images[currentIndex];
}
/**
* Construct a new GifImage instance using the specified image file. The animation will initially
* be running. Use getImage() at any time to get the current image in the animation sequence.
*/
public GifImage(String file) {
this.file = file;
pause = false;
if (file.toLowerCase().endsWith(".gif")) {
loadImages();
} else {
images = new GreenfootImage[] {new GreenfootImage(file)};
delay = new int[] {1000}; // Doesn't matter, as long as it's not zero
currentIndex = 0;
time = System.currentTimeMillis();
}
}
/** 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();
}
/** Resume the animation. */
public void resume() {
pause = false;
time = System.currentTimeMillis();
}
/**
* Creates new frame image from current data (and previous frames as specified by their
* disposition codes).
*/
protected void setPixels() {
// expose destination image's pixels as int array
int[] dest = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
// fill in starting image contents based on last image's dispose code
if (lastDispose > 0) {
if (lastDispose == 3) {
// use image before last
int n = frameCount - 2;
if (n > 0) {
lastImage = getFrame(n - 1);
} else {
lastImage = null;
}
}
if (lastImage != null) {
int[] prev = ((DataBufferInt) lastImage.getRaster().getDataBuffer()).getData();
System.arraycopy(prev, 0, dest, 0, width * height);
// copy pixels
if (lastDispose == 2) {
// fill last image rect area with background color
Graphics2D g = image.createGraphics();
Color c = null;
if (transparency) {
c = new Color(0, 0, 0, 0); // assume background is transparent
} else {
c = new Color(lastBgColor); // use given background color
}
g.setColor(c);
g.setComposite(AlphaComposite.Src); // replace area
g.fill(lastRect);
g.dispose();
}
}
}
// copy each source line to the appropriate place in the destination
int pass = 1;
int inc = 8;
int iline = 0;
for (int i = 0; i < ih; i++) {
int line = i;
if (interlace) {
if (iline >= ih) {
pass++;
switch (pass) {
case 2:
iline = 4;
break;
case 3:
iline = 2;
inc = 4;
break;
case 4:
iline = 1;
inc = 2;
}
}
line = iline;
iline += inc;
}
line += iy;
if (line < height) {
int k = line * width;
int dx = k + ix; // start of line in dest
int dlim = dx + iw; // end of dest line
if ((k + width) < dlim) {
dlim = k + width; // past dest edge
}
int sx = i * iw; // start of line in source
while (dx < dlim) {
// map color and insert in destination
int index = ((int) pixels[sx++]) & 0xff;
int c = act[index];
if (c != 0) {
dest[dx] = c;
}
dx++;
}
}
}
}
/**
* Update the lastState property. Should ideally be called on each World.act(), or at least before
* getState() in a frame where mouse info is wanted.
*/
public void act() {
MouseInfo mouseinfo = Greenfoot.getMouseInfo();
/* To-be properties of MouseState */
boolean held = lastState.held;
boolean down = false;
boolean up = false;
boolean moved;
Vector position;
if (mouseinfo != null) {
/* Get the new mouse position */
position = new Vector(mouseinfo.getX(), mouseinfo.getY());
/* We have moved if there is a difference between this mouse position and
* the previous mouse position. */
moved = lastState.position == null || position.subtract(lastState.position).length() > 0.5;
} else {
/* mouseinfo == null */
/* Use the previous mouse position */
position = lastState.position;
/* We haven't moved the mouse pointer. */
moved = false;
}
if (lastState.held) {
/* Figure out if the mouse has been released. This has to be done
* differently on Mac OS X, as MouseInfo contains different info in case
* of mouse release on that platform. */
if (System.getProperty("os.name").equals("Mac OS X")) {
if (Greenfoot.mouseClicked(null)
|| mouseinfo != null
&& (mouseinfo.getActor() != concerning || mouseinfo.getButton() != 1)) {
up = true;
held = false;
}
} else {
/* TODO: Check if this behaves correctly in Windows */
if (Greenfoot.mouseClicked(concerning)
|| mouseinfo != null
&& (mouseinfo.getActor() != concerning || mouseinfo.getButton() != 0)) {
up = true;
held = false;
}
}
} else {
/* !lastState.held */
/* Figure out if mouse has been pressed. This is thankfully
* cross-platform consistent. */
if (Greenfoot.mousePressed(concerning)) {
down = true;
held = true;
}
}
/* Store the state in the lastState property. */
lastState = new MouseState(held, down, up, moved, position);
}