camera.java

J2ME游戏范列,类似于超级玛利奥.源程序

public abstract class Camera{
	public static final int SAVEDISX = PandaCanvas.SCREENW/3,SAVEDISY = PandaCanvas.SCREENH/3;
	public static int x,y,width,height;
	
//	初始化镜头，使它对准参数中的对象
	public static final void init(Panda panda){
		if(panda.x <= SAVEDISX)
			x = 0;
		else if(panda.x - x <= SAVEDISX)
			x = panda.x - SAVEDISX;
		else if(panda.x >= PandaCanvas.mapW - SAVEDISX - panda.width)
			x = PandaCanvas.mapW - PandaCanvas.SCREENW;
		else if(panda.x - x >= PandaCanvas.SCREENW-SAVEDISX - panda.width)
			x = panda.x + panda.width + SAVEDISX - PandaCanvas.SCREENW;
		
		if(panda.y <= SAVEDISY)
			y = 0;
		else if(panda.y - y <= SAVEDISY)
			y = panda.y - SAVEDISY;
		else if(panda.y >= PandaCanvas.mapH - SAVEDISY - panda.height)
			y = PandaCanvas.mapH - PandaCanvas.SCREENH;
		else if(panda.y - y >= PandaCanvas.SCREENH-SAVEDISY - panda.height)
			y = panda.y + panda.height + SAVEDISY - PandaCanvas.SCREENH;
	}
	
//	跟随镜头
	public static final void setFollow(Panda panda){
		if(PandaCanvas.mapH <= height)
			y = 0;
		else if(panda.speedY < 0){
			if(panda.y <= SAVEDISY)
				y = 0;
			else if(panda.y - y <= SAVEDISY)
				y = panda.y - SAVEDISY;
		}else if(panda.speedY > 0){
			if(panda.y >= PandaCanvas.mapH - SAVEDISY - panda.height)
				y = PandaCanvas.mapH - PandaCanvas.SCREENH;
			else if(panda.y - y >= PandaCanvas.SCREENH-SAVEDISY - panda.height)
				y = panda.y + panda.height + SAVEDISY - PandaCanvas.SCREENH;
		}
		
		if(PandaCanvas.mapW <= width)
			x = 0;
		else if(panda.speedX < 0){
			if(panda.x <= SAVEDISX)
				x = 0;
			else if(panda.x - x <= SAVEDISX)
				x = panda.x - SAVEDISX;
		}else if(panda.speedX > 0){
			if(panda.x >= PandaCanvas.mapW - SAVEDISX - panda.width)
				x = PandaCanvas.mapW - PandaCanvas.SCREENW;
			else if(panda.x - x >= PandaCanvas.SCREENW-SAVEDISX - panda.width)
				x = panda.x + panda.width + SAVEDISX - PandaCanvas.SCREENW;
		}
	}
}