thing.java

java编的一个火焰程序

package skyrocket;

import java.awt.Color;
import java.awt.Graphics2D;

abstract class Thing implements Comparable {




Canvas canvas;
int birthTime;
Color color;
int width, height;
double stateX, stateY, velocity;
boolean stateDead;

Thing( Canvas canvas ) {
	this.canvas = canvas;
	birthTime = canvas.currentTime;
}

void paint() {
	Graphics2D g = (Graphics2D) canvas.offscreenGraphics;
	int time = canvas.currentTime - birthTime;
	g.setColor( color );
	draw( g, time );
}

abstract void draw( Graphics2D g, int time );

public int compareTo( Object o ) {
	Thing thing = (Thing) o;
	if( birthTime > thing.birthTime )
		return -1;
	if( birthTime < thing.birthTime )
		return 1;
	if( equals( thing ) )
		return 0;
	return -1;
}




}