bonus.java

j2me手机游戏光盘文件 压缩包里有说明文件

import javax.microedition.lcdui.game.*;
import javax.microedition.lcdui.*;
import java.util.Random;
public class Bonus extends Sprite
{
    private boolean isAlive =  false;

    private Random random;

    public int bonusType;

    private int frameWidth, frameHeight;
    private int CanvasWidth, CanvasHeight;
    public Bonus(Image image, int frameWidth, int frameHeight)
    {
        super(image, frameWidth, frameHeight);
        this.frameWidth = frameWidth;
        this.frameHeight = frameHeight;
        defineReferencePixel(frameWidth / 2, frameHeight / 2);
        random = new Random();

    }
    public void draw(Graphics g)
    {
        if (isAlive)
            paint(g);

    }
    public void setCanvasSize(int CanvasWidth, int CanvasHeight)
    {
        this.CanvasWidth = CanvasWidth;
        this.CanvasHeight = CanvasHeight;
    }
    public void setAlive(boolean isAlive)
    {
        this.isAlive = isAlive;
        if(isAlive){
        setPosition(((random.nextInt() & 0x7fffffff) % (CanvasWidth -
            frameWidth)),  - frameHeight);
        bonusType = (random.nextInt() & 0x7fffffff) % 3;
        setFrame(bonusType);
      }
    }
    public boolean isAlive()
    {
        return isAlive;
    }
    public void tick()
    {
        if (isAlive)
        {
        	
            move(0, 1);
            if (getY() > CanvasHeight)
                isAlive = false;

        }

    }
}