microetanksprite.java

坦克大战源代码

import java.io.IOException;

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
//自定义一个敌方坦克类-------------------------
public class MicroETankSprite extends Sprite implements Runnable
{
    private int mDirection;
    private int mKX, mKY;
    private int x, y;
    private int delta3;

    private int mLastDelta;
    private int efx = 4;//敌方坦克初始移动方向
    private int esd = 2;//敌方坦克初始移动量
    private boolean firsttry = false;
    public boolean elift = true;//敌方坦克活着

    public static BulletsSprite ebullets; //BulletsSprite子弹类

    private static final int[] kTransformLookup = { Sprite.TRANS_MIRROR_ROT270,
            Sprite.TRANS_MIRROR_ROT270, Sprite.TRANS_ROT90, Sprite.TRANS_NONE,
            Sprite.TRANS_ROT180 };
//--------------构造函数-------------------------
    public MicroETankSprite(Image image, int eWidth, int eHeight)
    {
        super(image, eWidth, eHeight);
        defineReferencePixel(eWidth / 2, eHeight / 2);//自定义本身的参考点
        elift = true;
        try
        {
            ebullets = createBullets();//创建敌方子弹
            ebullets.setVisible(false);//不可见
        }
        catch (IOException ioe)
        {
        }
        catch (Exception e)
        {
        }

    }
//------------------子弹的创建---------------------
    private BulletsSprite createBullets() throws IOException
    {
        Image image = Image.createImage("/bullets.png");
        return new BulletsSprite(image, 3, 3);
    }
//---------------------启动敌方坦克线程-----------------
    public void start()
    {

        Thread t = new Thread(this);
        t.start();
    }

    public void run()
    {

        while (elift)//当敌方坦克还活着时执行
        {
            long times_s = System.currentTimeMillis();
            forward(esd, efx);// 移动量与移动方向 esd, efx在后面会被传入的参数改变
            
//            System.out.println("敌方坦克移动量   "+esd);
            startfire();//

            long times_e = System.currentTimeMillis();
            long times = times_e - times_s;

            if (times > 80)
            {
                times = 80;
            }
            try
            {
                Thread.sleep(80 - times);

            }
            catch (InterruptedException ie)
            {
                ie.printStackTrace();
            }

        }
    }
    //-------------控制移动--------------------
    private void forward(int delta, int delta2)
    {
        if (delta2 == 1)
        {
            fineMove(delta, 0);
        }
        else if (delta2 == 2)
        {
            fineMove(delta, 0);
        }
        else if (delta2 == 3)
        {
            fineMove(0, delta);
        }
        else if (delta2 == 4)
        {
            fineMove(0, delta);
        }

        setTransform(kTransformLookup[delta2]);
        delta3 = delta2;
        mLastDelta = delta;

    }

    private void startfire()
    {
        if (this != null)
        {
            ebullets.start(this.getX(), this.getY(), efx, esd * 2, 0);//0表示敌方坦克 此为子弹的移动,包括方向和移动量
        }
    }
//--------------------碰撞的处理,此方法只处理,不作检测,检测由外部类检测(敌方坦克)-----------------
    public void undo()
    {

        if ((efx >= 4) && firsttry)//
        {
            efx = 0;
            firsttry = false;
            efx += 1;
        }
        else if ((efx >= 4) && (!firsttry))
        {
            efx = 0;
            firsttry = true;
        }
        else if ((efx == 2) && firsttry)
        {
            efx = 1;
            firsttry = false;
        }
        else if ((efx == 1) && !firsttry)
        {
            efx = 3;
            firsttry = true;
        }
        efx += 1;//如果碰到障碍,则另找方向

        if (efx == 1)//1为向左
        {
            esd = -2;//左
        }
        else if (efx == 2)//2为向右
        {
            esd = 2;//向右

        }
        else if (efx == 3)//3为向上
        {
            esd = -2;//上
        }
        else if (efx == 4)//4为向下
        {
            esd = 2;//向下
        }
        x = x - 3;
        y = y - 3;

    }

    public static void stop()
    {

        Thread.yield();//敌方坦克暂停一下

    }
//------------坦克移动操作---------------------
    private void fineMove(int kx, int ky)
    {

        x = this.getX();
        y = this.getY();
        x += kx;
        y += ky;
        if (y >= 240)
        {
            y = y - 3;
            undo();
        }
        else if (y <= 0)
        {
            y = y + 3;
            undo();
        }

        if (x <= 0)
        {
            x = x + 3;
            undo();
        }
        else if (x >= 232)
        {
            x = x - 3;
            undo();
        }

        this.setPosition(x, y);//重新设置位置

    }
}