ship.java

J2ME飞机设计游戏,希望对学习J2ME的程序员有所帮助

import java.io.IOException;

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

public class Ship extends Actor {
	public Ship(){
		world = World.getInstance();
	}
	
	public void initData() {
		try {
			shipImage = Image.createImage("/ship.png");
		} catch (IOException e) {
			e.printStackTrace();
		}

		initXYSpeed();
		
	}
	
	public void changeMyState(){
		int [] data = getIProcessData();

		if(processCount <  getIProcess()){			
			if (++processTimeCount <= data[processCount * 3 + 0]) {
				int orbitType = data[processCount * 3 + 1];
				int bulletType = data[processCount * 3 + 2];
				updateXY(orbitType,bulletType);
			}else{
				processCount++;
				processTimeCount=0;
			}
		}
	}
	
	public void updateXY(int orbitType, int bulletType) {
		int xPos = getIPosX();
		int yPos = getIPosY();
		int speed = getSpeed() << 8;
		switch (orbitType) {
		case 12: // 顺时针向下
			setIPosY(yPos + speed);

			if (bulletType != 0) {
				if (processTimeCount == 1) {
					// 求朝屏幕中心运动的X，Y的运动的速度
					int centerX = GameConstant.iSCREEN_WIDTH >> 1;
					int centerY = GameConstant.iSCREEN_HEIGHT >> 1;
					int bulletX = (xPos >> 8) - 5;
					int bulletY = (yPos >> 8) - 23;

					int dis = Tool.sqrt(Tool.getDistance(centerX, centerY,
							bulletX, bulletY));

					int xSpeed = (4 << 8) / dis * (centerX - bulletX);
					int ySpeed = -(4 << 8) / dis * (centerY - bulletY);

					bullet = world.newBullet(bulletType, xPos - (5 << 8), yPos
							- (23 << 8), xSpeed, ySpeed);
				}

				if (processTimeCount == 20) {
					// fire(bulletType, bullet.getIPosX(), bullet.getIPosY());
					// bullet.setYSpeed( - 100 << 8); //让他消失
					// bullet.setXSpeed(secXSpeed[0]);
					// bullet.setYSpeed(secYSpeed[0]);
					//world.getHelicopterBulletPool().releasUsed(bullet); // 让他消失

					for (int idx = 0; idx < 8; idx++) {
						world.newBullet(bulletType, bullet.getIPosX(), bullet
								.getIPosY(), secXSpeed[idx], secYSpeed[idx]);
					}
				}
			}
			break;
		case 0: // 原地不动
			if (processTimeCount == 1) {
				for (int idx = 0; idx < 5; idx++) {
					world.newBullet(bulletType, xPos - (5<<8), yPos - (23 << 8),
							xSpeed[idx], ySpeed[idx]);
				}
			}
			break;
		}
	}
	
	public void draw(Graphics graphics){
		graphics.drawImage(shipImage, getIPosX() >> 8, getIPosY() >> 8,
				GameConstant.CENTER);
	}
	
	
	private void initXYSpeed(){
		//已300度到240度的角
		xSpeed = Tool.getXSpeedByAngle(300,5,15,4);
		ySpeed = Tool.getYSpeedByAngle(300,5,15,4);
		
		secXSpeed = Tool.getXSpeedByAngle(360,8,45,5);
		secYSpeed = Tool.getYSpeedByAngle(360,8,45,5);
	}
	
	private int [] xSpeed = new int[5];
	private int [] ySpeed = new int [5];
	private int [] secXSpeed = new int [8];
	private int [] secYSpeed = new int [8];
	
	private Image shipImage;
	private Bullet bullet = null;
	private World world;
}