From zero to a complete game with Cocos2d HTML5 – Step 2: mouse interaction

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Welcome to the second step of the complete game creation with Cocos2D HTML5. This time we are going to add mouse interaction.

In the original Circle Chain game you move a red circle with the mouse. With a mouse click you will destroy the circle which will split into four bullets flying up, down, left and right.

This is what we are going to do with today’s step. Starting from step 1, you only have to make some changes to circlechain.js file:

var circlechain = cc.Scene.extend({
	onEnter:function(){
		this._super();
		var layer = new circleChainGame();
		layer.init();
		this.addChild(layer);
	}
})

var redCircle;
var gameLayer;
var bulletSpeed=5;

var circleChainGame = cc.Layer.extend({
	init:function(){
		this._super();
		this.setMouseEnabled(true);
		var circleSpeed = 2;
		var s = cc.Director.getInstance().getWinSize();
		gameLayer = cc.LayerColor.create(new cc.Color4B(0, 0, 0, 255), 500, 500)
		for(i=0;i<10;i++){
			var greenCircle = cc.Sprite.create("greencircle.png");
			var randomDir = Math.random()*2*Math.PI;
			greenCircle.xSpeed=circleSpeed*Math.cos(randomDir);
			greenCircle.ySpeed=circleSpeed*Math.sin(randomDir);
			gameLayer.addChild(greenCircle);
			greenCircle.setPosition(new cc.Point(Math.random()*500,Math.random()*500));
			greenCircle.schedule(function(){
     			this.setPosition(new cc.Point(this.getPosition().x+this.xSpeed,this.getPosition().y+this.ySpeed));
     			if(this.getPosition().x>500){
					this.setPosition(new cc.Point(this.getPosition().x-500,this.getPosition().y));
				}
				if(this.getPosition().x<0){
					this.setPosition(new cc.Point(this.getPosition().x+500,this.getPosition().y));
				}
				if(this.getPosition().y>500){
					this.setPosition(new cc.Point(this.getPosition().x ,this.getPosition().y-500));
				}
				if(this.getPosition().y<0){
					this.setPosition(new cc.Point(this.getPosition().x ,this.getPosition().y+500));
				}
			})
		}
		redCircle=cc.Sprite.create("redcircle.png");		
		gameLayer.addChild(redCircle);
     	this.addChild(gameLayer);
		return true;
	},
	onMouseDown:function (event) {
		var location = event.getLocation();
		gameLayer.removeChild(redCircle);
		for(i=0;i<4;i++){
			var redBullet = cc.Sprite.create("redbullet.png");
			redBullet.xSpeed=bulletSpeed*Math.cos(i*Math.PI/2);
			redBullet.ySpeed=bulletSpeed*Math.sin(i*Math.PI/2);
			gameLayer.addChild(redBullet);	
			redBullet.setPosition(location);
			redBullet.schedule(function(){
     			this.setPosition(new cc.Point(this.getPosition().x+this.xSpeed,this.getPosition().y+this.ySpeed));
				if(this.getPosition().x>500 || this.getPosition().y>500 || this.getPosition().x<0 || this.getPosition().y<0){
					gameLayer.removeChild(this);
				}
			})
		}
	},
	onMouseMoved:function(event){
		var location = event.getLocation();
		redCircle.setPosition(location);
	}
})

And this is what you’ll get:

Move the red circle with the mouse and click on the stage to make it explode.

Next time, I’ll show you the complete level with the chain reaction and I’ll fully comment the code.

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215 GAME PROTOTYPES EXPLAINED WITH SOURCE CODE
// 1+2=3
// 100 rounds
// 10000000
// 2 Cars
// 2048
// A Blocky Christmas
// A Jumping Block
// A Life of Logic
// Angry Birds
// Angry Birds Space
// Artillery
// Astro-PANIC!
// Avoider
// Back to Square One
// Ball Game
// Ball vs Ball
// Ball: Revamped
// Balloon Invasion
// BallPusher
// Ballz
// Bar Balance
// Bejeweled
// Biggification
// Block it
// Blockage
// Bloons
// Boids
// Bombuzal
// Boom Dots
// Bouncing Ball
// Bouncing Ball 2
// Bouncy Light
// BoxHead
// Breakout
// Bricks
// Bubble Chaos
// Bubbles 2
// Card Game
// Castle Ramble
// Chronotron
// Circle Chain
// Circle Path
// Circle Race
// Circular endless runner
// Cirplosion
// CLOCKS - The Game
// Color Hit
// Color Jump
// ColorFill
// Columns
// Concentration
// Crossy Road
// Crush the Castle
// Cube Jump
// CubesOut
// Dash N Blast
// Dashy Panda
// Deflection
// Diamond Digger Saga
// Don't touch the spikes
// Dots
// Down The Mountain
// Drag and Match
// Draw Game
// Drop Wizard
// DROP'd
// Dudeski
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// Endless Runner
// Erase Box
// Eskiv
// Farm Heroes Saga
// Filler
// Flappy Bird
// Fling
// Flipping Legend
// Floaty Light
// Fuse Ballz
// GearTaker
// Gem Sweeper
// Globe
// Goat Rider
// Gold Miner
// Grindstone
// GuessNext
// Helicopter
// Hero Emblems
// Hero Slide
// Hexagonal Tiles
// HookPod
// Hop Hop Hop Underwater
// Horizontal Endless Runner
// Hundreds
// Hungry Hero
// Hurry it's Christmas
// InkTd
// Iromeku
// Jet Set Willy
// Jigsaw Game
// Knife Hit
// Knightfall
// Legends of Runeterra
// Lep's World
// Line Rider
// Lumines
// Magick
// MagOrMin
// Mass Attack
// Math Game
// Maze
// Meeblings
// Memdot
// Metro Siberia Underground
// Mike Dangers
// Mikey Hooks
// Nano War
// Nodes
// o:anquan
// One Button Game
// One Tap RPG
// Ononmin
// Pacco
// Perfect Square!
// Perfectionism
// Phyballs
// Pixel Purge
// PixelField
// Planet Revenge
// Plants Vs Zombies
// Platform
// Platform game
// Plus+Plus
// Pocket Snap
// Poker
// Pool
// Pop the Lock
// Pop to Save
// Poux
// Pudi
// Pumpkin Story
// Puppet Bird
// Pyramids of Ra
// qomp
// Quick Switch
// Racing
// Radical
// Rebuild Chile
// Renju
// Rise Above
// Risky Road
// Roguelike
// Roly Poly
// Run Around
// Rush Hour
// SameGame
// SamePhysics
// Save the Totem
// Security
// Serious Scramblers
// Shrink it
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// Slingy
// Snowflakes
// Sokoban
// Space Checkers
// Space is Key
// Spellfall
// Spinny Gun
// Splitter
// Spring Ninja
// Sproing
// Stabilize!
// Stack
// Stairs
// Stick Hero
// String Avoider
// Stringy
// Sudoku
// Super Mario Bros
// Surfingers
// Survival Horror
// Talesworth Adventure
// Tetris
// The Impossible Line
// The Moops - Combos of Joy
// The Next Arrow
// Threes
// Tic Tac Toe
// Timberman
// Tiny Wings
// Tipsy Tower
// Toony
// Totem Destroyer
// Tower Defense
// Trick Shot
// Tunnelball
// Turn
// Turnellio
// TwinSpin
// vvvvvv
// Warp Shift
// Way of an Idea
// Whack a Creep
// Wheel of Fortune
// Where's my Water
// Wish Upon a Star
// Word Game
// Wordle
// Worms
// Yanga
// Yeah Bunny
// Zhed
// zNumbers