Hi,
I’m a new member in the java game’s world and my intent is to write my first game: a “shooting game”.
I wanna give an animation to the enemy sprites, I’ve seen the “Animation.java” class in the “New Riders Developing Games In Java” document and I would like to know if is good or if there are best ways to build animation.
This is the code:
import java.awt.Image;
import java.util.ArrayList;
/**
The Animation class manages a series of images (frames) and
the amount of time to display each frame.
*/
public class Animation {
private ArrayList frames;
private int currFrameIndex;
private long animTime;
private long totalDuration;
/**
Creates a new, empty Animation.
*/
public Animation() {
frames = new ArrayList();
totalDuration = 0;
start();
}
/**
Adds an image to the animation with the specified
duration (time to display the image).
*/
public synchronized void addFrame(Image image,
long duration)
{
totalDuration += duration;
frames.add(new AnimFrame(image, totalDuration));
}
/**
Starts this animation over from the beginning.
*/
public synchronized void start() {
animTime = 0;
currFrameIndex = 0;
}
/**
Updates this animation's current image (frame), if
necessary.
*/
public synchronized void update(long elapsedTime) {
if (frames.size() > 1) {
animTime += elapsedTime;
if (animTime >= totalDuration) {
animTime = animTime % totalDuration;
currFrameIndex = 0;
}
while (animTime > getFrame(currFrameIndex).endTime) {
currFrameIndex++;
}
}
}
/**
Gets this Animation's current image. Returns null if this
animation has no images.
*/
public synchronized Image getImage() {
if (frames.size() == 0) {
return null;
}
else {
return getFrame(currFrameIndex).image;
}
}
private AnimFrame getFrame(int i) {
return (AnimFrame)frames.get(i);
}
private class AnimFrame {
Image image;
long endTime;
public AnimFrame(Image image, long endTime) {
this.image = image;
this.endTime = endTime;
}
}
}