chasesprite.java

J2ME拯救海盗游戏基本功能已实现11111111

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import java.util.*;

//敌人战舰
public class ChaseSprite extends MainSprite 
{
	public ChaseSprite(Image image, int frameWidth, int frameHeight,
					   int speed, TiledLayer barrier)
	{
		super(image, frameWidth, frameHeight, speed, barrier);
	}

	//追击
	public void chase(Sprite chasee)
	{
		int direction = 0;
		
		int xPos = getX();
		int yPos = getY();

		if (getX() > (chasee.getX() + chasee.getWidth() / 2)) 
		{
			// 向左
			move(-getSpeed(), 0);
			direction = 3;
		}
		else if ((getX() + getWidth() / 2) < chasee.getX())
		{
			// 向右
			move(getSpeed(), 0);
			direction = 1;
		}
		else if (getY() > (chasee.getY() + chasee.getHeight() / 2)) 
		{
			// 向上
			move(0, -getSpeed());
			direction = 0;
		} 
		else if ((getY() + getHeight() / 2) < chasee.getY()) 
		{
			// 向下
			move(0, getSpeed());
			direction = 2;
		}

		// 检测与图层碰撞
		if (collidesWith(this.getBarrier(), true))
		{
			setPosition(xPos, yPos);
		}

		setFrame(direction);
	}
}