trialsprit.java

Java j2me写的一款手机飞行游戏

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import java.io.IOException;
import java.util.Random;

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

public class TrialSprit extends Sprite {
	int mType;
	int mFrameIndex = 0;
	int mDirection = 0;
	int mSpeed;
	final static int TNormal = 1;
	int mStepCnt = 0;
	int mInternalCnt = 15;
	Random mRandom = new Random();

	final static int TBullet = 2;
	
	private int RectX0=0,RectY0=0,RectWidth=200,RectHeight=240; //飞行范围

	private static final int[] kFrameLookup = {12, 13, 14, 15, 8, 9, 10, 11, 0,
			1, 2, 3, 4, 5, 6, 7};

	public TrialSprit(Image arg0, int arg1, int arg2, int type) {
		super(arg0, arg1, arg2);
		mType = type;
		mSpeed = 5;

		mInternalCnt = mRandom.nextInt() % 10;
		this.setPosition(mRandom.nextInt() % RectWidth, mRandom.nextInt() % RectHeight);
	}

	public TrialSprit() throws IOException {
		super(Image.createImage("/bird160X160.png"), 40, 40);
		mType = TBullet;
	}
	
	public void setRect(int x,int y,int w,int h){
		RectX0=x;RectY0=y; RectWidth=w;RectHeight=h;
	}

	private void turnTo(int dir) {
		mDirection = dir;
		setFrame(kFrameLookup[mDirection * 4]);
	}

	private void forward(int delta) {
		switch (mDirection) {
			case 0 :
				move(0, -delta);
				break;
			case 1 :
				move(delta, 0);
				break;
			case 2 :
				move(0, delta);
				break;
			case 3 :
				move(-delta, 0);
				break;
		}
		mFrameIndex = (mFrameIndex + 1) % 4;

		setFrame(kFrameLookup[mDirection * 4 + mFrameIndex]);
	}

	public boolean stepMove() {
		if (mStepCnt >= mInternalCnt) {
			mStepCnt = 0;
			mInternalCnt = mRandom.nextInt() % 20 + 10;
			if (getX() > RectWidth)
				mDirection = 3;
			else if (getX() < RectX0)
				mDirection = 1;
			else if (getY() > RectHeight)
				mDirection = 0;
			else if (getY() < RectY0)
				mDirection = 2;
			else
				mDirection = Math.abs(mRandom.nextInt()) % 4;
			turnTo(mDirection);
			return false;
		}
		forward(mSpeed);
		mStepCnt++;

		return true;
	}

}