【Cocos2d-js之旅】1-贪吃蛇

这两天前辈要我用cocos2d-js做一个贪吃蛇，记录一下代码

joyStick.js

var joyStick = cc.Layer.extend(
{ctor:function()
	{
		this._super();
		this.initGame();

		//add 4 sprite
		this.addChild(JoyStickBg);
		this.addChild(joyStickPt);
		this.addChild(helloLabel);
		this.addChild(score_label);

		
		GetDirection=function(a,b)
		{
			var pt = cc.p(cc.pSub(a,b));
			if(Math.abs(pt.x)<0.000001&&Math.abs(pt.y)<0.000001)  //judge if equal
				return cc.p(0,0);
			return cc.pNormalize(cc.pSub(a,b));
		},return true;
	},update:function(){
		
		var newPos = cc.pAdd(snake_list[0][0].getPosition(),cc.pMult(snake_list[0][1],movespeed));
		//judge if touch the wall
		if(newPos.x<0)
		{
			this.SetGameState(2);
			newPos.x = 0;
		}
		if(newPos.x>winSize.width)
		{
			this.SetGameState(2);
			newPos.x= winSize.width;
		}
		if(newPos.y<0)
		{
			this.SetGameState(2);
			newPos.y = 0;
		}
		if(newPos.y>winSize.height)
		{
			this.SetGameState(2);
			newPos.y = winSize.height;
		}
		snake_list[0][0].setPosition(newPos);  //set position of snake head

		//set position and direction of child snake node
		for (var i = snake_list.length - 1; i >= 1; i--) {
			snake_list[i][1] = snake_list[i][2];
			snake_list[i][2] = snake_list[i-1][1];
			var dPos = cc.pAdd(snake_list[i-1][0].getPosition(),cc.pMult(snake_list[i-1][1],-movespeed));
			//var dPos = cc.pAdd(snake_list[i][0].getPosition(),cc.pMult(snake_list[i][1],movespeed));
			snake_list[i][0].setPosition(dPos);
		}
		//judge if eat food
		if(cc.pDistance(newPos,cur_food.getPosition())<cur_food._contentSize.width)
		{

			this.AddNewFood();
			this.AddSnakeNode(5);
		}

		//check collision
		for (var i = snake_list.length - 1; i >= 2; i--) {
			if(cc.pDistance(snake_list[i][0].getPosition(),newPos)<5)
			{
				this.SetGameState(2);
			}
		}
	},SetGameState:function(flag)		//set game state flag=1 for win while flag =2 for fail
	{
		if(flag == 1)
		{
			cc.log("set win");
			//set win
		}
		else
		{
			cc.log("set fail");

			//remove 4 sprite for next use
			this.removeChild(joyStickPt);
			this.removeChild(JoyStickBg);
			this.removeChild(helloLabel);
			this.removeChild(score_label);

			this.unscheduleUpdate();

			var endGameScene = new endGame();
			cc.director.runScene(endGameScene);
			
			//set fail
		}
	},AddNewFood :function()		//add a new food on the map
	{
		if (cur_food==null)
		{
			cur_food = new cc.Sprite("res/pt.png");
			this.addChild(cur_food);
		}
		var rd_spawn = cc.p(cc.random0To1()*(winSize.width-cur_food._contentSize.width)+cur_food._contentSize.width/2,cc.random0To1()*(winSize.height-cur_food._contentSize.width/2)+cur_food._contentSize.width/2);
		cur_food.setColor(cc.color(255,255,0));
		cur_food.setPosition(rd_spawn);
		
	},AddSnakeNode:function(sNum)	//according to the giving sNum,add snake length and score
	{
		snake_length += sNum;
		var spriteName = "";
		database.score+=sNum;
		score_label.string = database.score


		if( snake_length>1)
		{
			spriteName = "res/body.png";
		}
		else
		{
			spriteName = "res/pt.png";
		}
		for (var i=0;i<sNum;i++)
		{
			var sLength = snake_list.length-1;
			var newNode = [
				sprite = new cc.Sprite(spriteName),dir = snake_list[sLength][1],nextdir = snake_list[sLength][1]
				
			];
			snake_list.push(newNode);
			var sLength = snake_list.length-1;
			this.addChild(snake_list[sLength][0]);
			var newPos = cc.pAdd(snake_list[sLength-1][0].getPosition(),cc.pMult(snake_list[sLength-1][1],-snake_list[0][0]._contentSize.width-5));
			snake_list[sLength][0].setPosition(newPos);
		}
		
	},initGame:function()
	{
		this.scheduleUpdate();
		bIsActived = false;
		radius = 48;
		snake_length = 1;
		curDirection = cc.p(1,0);
		game_state = 0;
		movespeed = 5;
		snake_list = [];
		snake_head_pos = cc.p(200,200);
		database.score = 0;
		var snake_head = [
			sprite = new cc.Sprite("res/pt.png"),dir = cc.p(1,0),nextdir = null
		];
		snake_list.push(snake_head);

		cur_food =null;
		score_label.string = database.score;
		curPosition = cc.p(JoyStickBg.x,JoyStickBg.y);
		centerPostion = cc.p(JoyStickBg.x,JoyStickBg.y);

		this.addChild(snake_list[0][0]);
		snake_list[0][0].setPosition(snake_head_pos);
		joyStickPt.x = 58;
		joyStickPt.y = 58;
		cc.eventManager.addListener(listenr_touch,this);
		this.AddNewFood();

		this.AddSnakeNode(100);
	}
});

bIsActived = false;
radius = 48;
snake_length = 1;
curDirection = cc.p(1,0);
game_state = 0;
movespeed = 5;
snake_list = [];
snake_head_pos = cc.p(200,200);
cur_food =null;

listenr_touch = cc.EventListener.create(
{
	event:cc.EventListener.TOUCH_ONE_BY_ONE,swallowTouches:true,onTouchBegan:function(touch,event)
	{
		var target = event.getCurrentTarget();
		var locationInNode = target.convertToNodeSpace(touch.getLocation());    
		if(cc.pDistance(centerPostion,locationInNode)<radius)
		{
			bIsActived = true;
		}
		return true;
	},onTouchMoved:function(touch,event)
	{
		if (bIsActived) {
			var target = event.getCurrentTarget();
			var locationInNode = target.convertToNodeSpace(touch.getLocation());   
			var delta = touch.getDelta();
			curPosition = cc.p(locationInNode.x+delta.x,locationInNode.y+delta.y);
			
			if(cc.pDistance(centerPostion,curPosition)>radius)
			{
				curPosition = cc.pAdd(centerPostion,cc.pMult(GetDirection(locationInNode,centerPostion),radius));
			}

			joyStickPt.setPosition(curPosition);
			curDirection = GetDirection(curPosition,centerPostion);
			if((snake_list[0][1].x*curDirection.x+snake_list[0][1].y*curDirection.y)>=0.00001)
			{

				snake_list[0][1] = GetDirection(curPosition,centerPostion);
			}
		}	
	},onTouchEnded:function(touch,event)
	{
		bIsActived = false;
		curPosition = centerPostion;
		joyStickPt.setPosition(curPosition);
	}
});

addFlag = 0;

JoyStickBg = new cc.Sprite("res/bg.png");
JoyStickBg.x = 58;
JoyStickBg.y = 58;
JoyStickBg.opacity = 100;

joyStickPt = new cc.Sprite("res/pt.png");
joyStickPt.x = 58;
joyStickPt.y = 58;

var helloLabel = new cc.LabelTTF("score:","",20);
helloLabel.x = 300;
helloLabel.y = 50;

score_label = new cc.LabelTTF("0",38);
score_label.x = 400;
score_label.y = 50;

curPosition = cc.p(JoyStickBg.x,JoyStickBg.y);
centerPostion = cc.p(JoyStickBg.x,JoyStickBg.y);

winSize = cc.winSize;

其中分数是采用一个在main.js中声明的全局数组记录的

startScene.js

var startLayer = cc.Layer.extend(
	{ctor:function()
		{
			this._super();
			var size = cc.winSize;

			var helloLabel = new cc.LabelTTF("hello Word",38);
			helloLabel.x = size.width/2;
			helloLabel.y = size.height/2;
			this.addChild(helloLabel);
			return true;
		}});

var startScene = cc.Scene.extend(
	{

		onEnter:function(){
			this._super();
			//var newLayer = new startLayer();
			var newLayer = ccs.load("res/startGame.json").node;
			var btn_start = ccui.helper.seekWidgetByName(newLayer,"Button_5");
			btn_start.addTouchEventListener(
				function (sender,type)
				{
					if(type==ccui.Widget.TOUCH_ENDED)
					{
						cc.director.runScene(new gameScene());
					}
				}
				);
			this.addChild(newLayer);
		}
	});

gameScene.js

var gameLayer = cc.Layer.extend(
	{ctor:function()
		{
			this._super();
			var joyStick = new joyStick();
			this.addChild(joyStick);
			return true;
		}});

var gameScene = cc.Scene.extend(
	{

		onEnter:function(){
			this._super();
			var newLayer = new joyStick();
			this.addChild(newLayer);
		}
	});

endGame.js

var endGame = cc.Scene.extend(
{ctor:function()
	{
		this._super();
		var endGameLayer = ccs.load("res/endGame.json").node;
		var label_score = ccui.helper.seekWidgetByName(endGameLayer,"label_score");
		var btn_restart = ccui.helper.seekWidgetByName(endGameLayer,"Button_5");
		btn_restart.addTouchEventListener(
			function (sender,type)
			{
				if(type==ccui.Widget.TOUCH_ENDED)
				{
					
					this.removeFromParent();
					var newGame = new cc.Scene();
					newGame.addChild(new joyStick());
					cc.director.runScene(newGame);
				}
			}
		);
		this.addChild(endGameLayer);
		label_score.string = database.score;
		return true;
	}});

原文链接：https://www.f2er.com/cocos2dx/339051.html

【Cocos2d-js之旅】1-贪吃蛇

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