gamescreen.java

一个小程序,提供参考

import java.io.IOException;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public class GameScreen extends Canvas implements Runnable {

	Image imgMap;
	Image imgRope;
	int x, y;
	int rx,ry;
	int frameWidth,frameHeight;
	int curState=-1;
	/** UP */
	final static int UP_MOVE = 0;

	/** DOWN */
	final static int DOWN_MOVE = 1;

	/** LEFT */
	final static int LEFT_MOVE = 2;

	/** RIGHT */
	final static int RIGHT_MOVE = 3;
	int curFrame;
	short map[][] = { { 6, 1, 1, 1, 1, 1, 1, 6, 4, 5 },
			{ 4, 6, 1, 1, 1, 1, 6, 4, 4, 5 }, { 4, 4, 6, 6, 6, 6, 4, 4, 4, 5 },
			{ 4, 4, 4, 6, 6, 4, 4, 4, 4, 5 }, { 4, 4, 4, 4, 4, 4, 4, 4, 4, 5 },
			{ 4, 5, 5, 4, 4, 6, 6, 4, 4, 4 }, { 4, 5, 5, 4, 4, 6, 6, 4, 4, 4 },
			{ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 }, { 4, 6, 6, 6, 6, 6, 6, 4, 4, 4 },
			{ 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 } };

	public GameScreen() {
		try {
			imgMap = Image.createImage("/layer.png");
			imgRope=Image.createImage("/ss.png");
		} catch (IOException e) {
		}
		frameWidth=imgRope.getWidth()/3;
		frameHeight=imgRope.getHeight()/4;
		new Thread(this).start();
	}

	protected void paint(Graphics g) {
		for (int row = 0; row < map.length; row++) {
			for (int col = 0; col < map[row].length; col++) {
				g.setClip(x+col * 35, y+row * 35, 35, 35);
				int tx, ty;
				tx = (map[row][col] - 1) % 3 * 35;
				ty = (map[row][col] - 1) / 3 * 35;
				g.drawImage(imgMap, -tx + col * 35+x, -ty + row * 35+y, 20);
			}
		}
		drawRope(g);
	}

	protected void keyPressed(int keyCode) {
		int t = getGameAction(keyCode);
		switch (t) {
		case UP:
			curState=UP_MOVE;
			y++;
			break;
		case DOWN:
			curState=DOWN_MOVE;
			y--;
			break;
		case LEFT:
			curState=LEFT_MOVE;
			x++;
			break;
		case RIGHT:
			curState=RIGHT_MOVE;
			x--;
			break;
		default:
		}
		repaint();
	}
	public void run(){
		while(true){
			repaint();
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
			}
		}
	}
	public void drawRope(Graphics g){
		int fx,fy;
		fx=curFrame%3*frameWidth;
		fy=curFrame/3*frameHeight;
		g.setClip(rx,ry, frameWidth, frameHeight);
		g.drawImage(imgRope, -fx+rx, -fy+ry, 20);
		move();
	}
	public void move() {
		if (curState != -1)
			curFrame++;
		switch (curState) {
		case UP_MOVE:
			ry-=3;
			if(curFrame<0||curFrame>2)
				curFrame=0;
			break;
		case DOWN_MOVE:
			ry+=3;
			if(curFrame<6||curFrame>8)
				curFrame=6;
			break;
		case LEFT_MOVE:
			rx-=3;
			if(curFrame<9||curFrame>11)
				curFrame=9;
			break;
		case RIGHT_MOVE:
			rx+=3;
			if(curFrame<3||curFrame>5)
				curFrame=3;
			break;
		default:
		}
	}
}