submarine.java~52~

利用Java 开发的一个手机版的潜艇游戏。游戏实现的重点就是屏幕的绘制滚动技术和碰撞检测技术

package mysubmarine;

import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.*;

/**
 * <p>Title: 一个简单的潜艇游戏</p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: Star Group</p>
 *
 * @author not attributable
 * @version 1.0
 */
public class Submarine extends MySprite implements Collidion {
    private boolean bLive = false; //生命状态
    private int troop = 0; //敌我识别标志

    private int levelState = 0; //自身以及子弹速度状态
    private int nDirectFlag = 1; //当前图形方向.  0为左, 1为右
    boolean bHurt = false;

    private int keyState = 0;
    private int hpLife = 15; //玩家生命值HP

    private int xStep = 15;
    private int yStep = 15;

    private int oldX;
    private int oldY;

    public Submarine(MySubmarineCanvas subCanvas, Image image,
                     int xPos, int yPos, LayerManager layerManager) {
        super(image);
        this.subCanvas = subCanvas;
        this.setPosition(xPos, yPos);
        this.layManager = layerManager;
        this.bLive = true;

        //设定敌我识别
        this.troop = MySubmarineCanvas.TROOP_PLAYER;
        this.levelState = 3;
        this.nDirectFlag = 1;
    }

    public void movePosition(int keyState) {
        this.keyState = keyState;
        //判断走向, 执行移动
        x = getX();
        y = getY();
        oldX = x;
        oldY = y;
        w = getWidth();
        h = getHeight();

        if(subCanvas.gameState == subCanvas.GAME_RUN){
            if((keyState & GameCanvas.DOWN_PRESSED)!= 0){//向下
                y = y+yStep;
            } else if((keyState & GameCanvas.UP_PRESSED)!= 0){//向上
                y = y-yStep;
            } else if((keyState & GameCanvas.LEFT_PRESSED)!= 0){//左移
                if(this.nDirectFlag == 1){
                    setTransform(Sprite.TRANS_MIRROR);
                    this.nDirectFlag = 0;
                }else {
                    x = x-xStep;
                }
            } else if((keyState & GameCanvas.RIGHT_PRESSED)!= 0){//右移
                if (this.nDirectFlag == 0) {
                    setTransform(Sprite.TRANS_NONE);
                    this.nDirectFlag = 1;
                } else {
                    x = x + xStep;
                }
            }
        }
        //确保图形在游戏区域
        if (x > MySubmarineCanvas.WORLD_WIDTH - w) {
            x = MySubmarineCanvas.WORLD_WIDTH - w;
        }
        if (x < 0) {
            x = 0;
        }
        if (y > MySubmarineCanvas.WORLD_HEIGHT - h) {
            y = MySubmarineCanvas.WORLD_HEIGHT - h;
        }
        if (y < 0) {
            y = 0;
        }
        this.setPosition(x, y);

        //处理碰撞事件
        checkCollidion();

        //当受到伤害时
        if (bHurt) {
            this.hurt();
        }

        //重新设置图层显示区域
        subCanvas.adjustViewWindow(x, y, getWidth(), getHeight());
    }

    public void fire() {
        if (subCanvas.torpedoVector.size() <= 10) {
            //开火
            Image image = ResObj.createImage("/res/tinfish3.png");

            if (this.nDirectFlag == 0) {
                //鱼雷方向向左
                Torpedo terpedo = new Torpedo(subCanvas, image, x, y + h / 2,
                                              this.troop, this.levelState,
                                              this.nDirectFlag);

                //添加鱼雷到数组以及图层上
                this.layManager.insert(terpedo, 0);
                subCanvas.torpedoVector.addElement(terpedo);

            } else {
                //鱼雷方向向左
                Torpedo tinfish = new Torpedo(subCanvas, image, x + w,
                                              y + h / 2,
                                              this.troop, this.levelState,
                                              this.nDirectFlag);

                //添加鱼雷到数组以及图层上
                layManager.insert(tinfish, 0);
                subCanvas.torpedoVector.addElement(tinfish);
            }
            image = null;
        }
    }

    private void hurt() {
        this.hpLife--;
        if (hpLife <= 0) {
            bLive = false;
        }
    }

    public void checkCollidion() {
        Sprite collideable = null;
        this.bHurt = false;
        for (int j = 0; j < subCanvas.enemyVector.size(); j++) {
            collideable = (Sprite) subCanvas.enemyVector.elementAt(j);
            if (collidesWith(collideable, true)) {
                this.bHurt = true;
            }
        }
    }

    public boolean getLifeState() {
        return bLive;
    }

    public int getTroopState() {
        return troop;
    }

    /** 获取玩家生命值
     * @return 返回 hpLife。
     */
    public int getHpLife() {
        return hpLife;
    }

    /**
     * @param hpLife 要设置的 hpLife。
     */
    public void setHpLife(int hpLife) {
        this.hpLife = hpLife;
    }
}