snake.java

“贪食蛇”游戏小程序设计与制作。实现贪食蛇游戏的运行

import java.util.Vector;
import java.awt.Point;
class Snake extends Vector {
	int length;
	Point head,end=null;
	int xBound =58;
	int yBound =47;
	GamePanel game;
	Snake(GamePanel game){
		this.game=game;
		length =game.length;
		head   =new Point(0,0);
		this.insertElementAt(head,0);
		xBound = 58;
		yBound = 47;
	}
	boolean move(int drict){
	    Point newhead =new Point();
	    Point point;
	    Point food;
	    switch(drict){
	    case 0:
	    	 newhead.x =head.x+1;
	    	 newhead.y =head.y;
	         break;
	    case 1:
	    	 newhead.x =head.x;
	    	 newhead.y =head.y+1;
	         break;
	    case 2:
	    	 newhead.x =head.x-1;
	    	 newhead.y =head.y;
	         break;
	    case 3:
	    	 newhead.x =head.x;
	    	 newhead.y =head.y-1;
	         break;
	    	}
	    if(newhead.x<0||newhead.x>=xBound||
	       newhead.y<0||newhead.y>=yBound){
	       	  return false;
	       }
	 	for(int i=0;i<game.dp.size();i++){
 			point=(Point)game.dp.elementAt(i);
  			if(newhead.equals(point)) return false;
	  	}
	    for(int i=0;i<this.size();i++){
	    	point = (Point)this.elementAt(i);
	    	if(point.equals(newhead)) return false;
	    }
	    this.insertElementAt(newhead,0);
	    head = newhead;
	    food=game.currentFood;
	    if(head.equals(food)){
	    	length++;
	    	return true;
	    }
	    if(this.size()>length) {
	    	end=(Point)this.elementAt(length);
	    	this.remove(length);}
	    return true;		
	}
}