背景：
最近火爆全球的游戏flappy bird让笔者叹为观止，于是花了一天的时间山寨了一个一模一样的游戏，现在把游戏的思路和源码分享出来，代码是基于javascript语言，cocos2d-x游戏引擎，cocos2d-x editor手游开发工具完成的，请读者轻砸；
ps：运行demo必须配置好cocos2d-x editor，暂不支持其他工具
手游开发神器 cocos2d-x editor工具下载和安装配置
代码下载：
效果图：
开发工具：
cocos2dx editor，它是开发跨平台的手机游戏工具，运行window系统上，javascript脚本语言，基于cocos2d-x跨平台游戏引擎, 集合代码编辑，场景设计，动画制作，字体设计，还有粒子，物理系统，地图等等的，而且调试方便，和实时模拟；
cocos2dx editor介绍和教程：http://blog.csdn.net/touchsnow/article/details/19070665；
cocos2dx-editor官方博客：http://blog.makeapp.co/?cat=8；
思路和源码：
1 场景设计MainLayer.ccbx，如下图；主要分三层，开始场景、主场景、游戏结束场景，通过显示隐藏控制三个场景的切换。
MainLayer.ccbx代码
<?xml version="1.0" encoding="UTF-8"?>
<Document
jsControlled="true"
jsController="MainLayer"
resolution="default"
>
<Resolutions>
<Resolution centeredOrigin="false" ext="iphone" height="1280" width="720" name="default" scale="1"/>
<Resolution centeredOrigin="false" ext="iphone" height="720" width="1280" name="default1" scale="1"/>
</Resolutions>
<Animations>
<Animation autoPlay="true"
id="0"
name="Default Timeline"
length="10"
chainedId="0"
offset="0.0"
position="0.0"
resolution="30"
scale="128">
<CallbackChannel>
</CallbackChannel>
<SoundChannel>
</SoundChannel>
</Animation>
</Animations>
<Layer
positionX="0" positionY="0.0"
sizeType="Percent"
width="100" height="100"
anchorPointX="0.5" anchorPointY="0.5" ignoreAnchorPoint="true"
scaleX="1" scaleY="1"
>
<Sprite positionType="LeftBottom" width="720.0" height="1280.0" positionX="0" positionY="0" anchorPointX="0"
anchorPointY="0" src="Resources/bg.png" name="" var="" target="None" scaleX="1" scaleY="1" visible="true"/>
<LayerColor positionType="LeftBottom" width="720" height="1280" positionX="0" positionY="0" anchorPointX="0"
anchorPointY="0" color="#fff2e8ff" visible="false"/>
<Menu positionType="LeftBottom" width="40" height="40" positionX="356.0" positionY="237.0" anchorPointX="0.5"
anchorPointY="0.5" scaleX="2.4" scaleY="1.725">
</Menu>
<Sprite positionType="LeftBottom" width="840.0" height="281.0" positionX="0" positionY="0" anchorPointX="0"
anchorPointY="0" src="Resources/ground.png" var="ground" target="Doc"/>
<Node positionType="LeftBottom" width="40" height="40" positionX="800" positionY="250" anchorPointX="0"
anchorPointY="0" var="hoseNode" target="Doc">
<Sprite positionType="LeftBottom" width="86.0" height="60.0" positionX="-500" positionY="400" anchorPointX="0.5"
anchorPointY="0.5" src="Resources/flappy_packer.plist/bird3.png" var="test" target="Doc" visible="false"/>
<Sprite positionType="LeftBottom" width="86.0" height="60.0" positionX="-550" positionY="500" anchorPointX="0.5"
anchorPointY="0.5" src="Resources/flappy_packer.plist/bird1.png" var="bird" target="Doc" scaleX="1" scaleY="1" rotation="0" visible="true"/>
</Node>
<Node positionType="LeftBottom" width="40" height="40" positionX="303.0" positionY="500" anchorPointX="0.5"
anchorPointY="0.5" var="readyNode" target="Doc" visible="true">
<Sprite positionType="LeftBottom" width="508.0" height="158.0" positionX="95.0" positionY="584.0" anchorPointX="0.5"
anchorPointY="0.5" src="Resources/flappy_packer.plist/getready.png"/>
<Sprite positionType="LeftBottom" width="286.0" height="246.0" positionX="73.0" positionY="236.0" anchorPointX="0.5"
anchorPointY="0.5" src="Resources/flappy_packer.plist/click.png"/>
</Node>
<Node positionType="LeftBottom" width="40" height="40" positionX="300" positionY="500" anchorPointX="0.5"
anchorPointY="0.5" var="overNode" target="Doc" visible="true">
<Sprite positionType="LeftBottom" width="590.0" height="298.0" positionX="72.0" positionY="219.0" anchorPointX="0.5"
anchorPointY="0.5" src="Resources/flappy_packer.plist/base.png">
<Sprite positionType="LeftBottom" width="508.0" height="158.0" positionX="286.0" positionY="458.0" anchorPointX="0.5"
anchorPointY="0.5" src="Resources/flappy_packer.plist/gameover.png"/>
</Sprite>
<Menu positionType="LeftBottom" width="40" height="40" positionX="0" positionY="0" anchorPointX="0.5"
anchorPointY="0.5">
<MenuItem positionType="LeftBottom" width="290" height="176" positionX="-65.0" positionY="-92.0" anchorPointX="0.5"
anchorPointY="0.5" normalImage="Resources/flappy_packer.plist/start.png" target="Doc" onClick="onStartClicked"/>
<MenuItem positionType="LeftBottom" width="290" height="176" positionX="230.0" positionY="-92.0" anchorPointX="0.5"
anchorPointY="0.5" target="Doc" normalImage="Resources/flappy_packer.plist/grade.png" onClick="onGradeClicked"/>
</Menu>
</Node>
</Layer>
</Document>
2 代码编写MainLayer.js
首先，小鸟在向前飞，其实是底部的路和水管在向左移动，相对的你就感觉小鸟在向右飞了；路循环移动代码：
MainLayer.prototype.groundRun = function ()
{
var action1 = cc.MoveTo.create(0.5, cc.p(-120, 0));
var action2 = cc.MoveTo.create(0, cc.p(0, 0));
var action = cc.Sequence.create(action1, action2);
this.ground.runAction(cc.RepeatForever.create(action));
}
初始化高低不同的水管，每一关卡都由上下两水管和空隙组成。总长度相同，空隙也一定，随机取下面水管的长度，就形成错落有致的水管关卡；
MainLayer.prototype.newHose = function (num)
{
var hoseHeight = 830;
var acrossHeight = 300;
var downHeight = 100 + getRandom(400);
var upHeight = 1100 - downHeight - acrossHeight;
var hoseX = 400 * num;
var HoseName = FP_MAIN_TEXTURE.HOSE;
var ccSpriteDown = cc.Sprite.createWithSpriteFrameName(HoseName[0]);
ccSpriteDown.setZOrder(1);
ccSpriteDown.setAnchorPoint(cc.p(0, 0));
ccSpriteDown.setPosition(cc.p(hoseX, 0));
ccSpriteDown.setScaleY(downHeight / hoseHeight);
var ccSpriteUp = cc.Sprite.createWithSpriteFrameName(HoseName[1]);
ccSpriteUp.setZOrder(1);
ccSpriteUp.setAnchorPoint(cc.p(0, 0));
ccSpriteUp.setPosition(cc.p(hoseX, downHeight + acrossHeight));
ccSpriteUp.setScaleY(upHeight / hoseHeight);
this.hoseNode.addChild(ccSpriteDown);
this.hoseNode.addChild(ccSpriteUp);
this.hoseSpriteList.push(ccSpriteDown);
this.hoseSpriteList.push(ccSpriteUp);
return null;
}
一开始进入游戏让底部路不断移动，初始化水管，显示准备游戏场景；
MainLayer.prototype.onEnter = function ()
{
cc.AnimationCache.getInstance().addAnimations("Resources/flappy_frame.plist");
this.groundRun();
this.ground.setZOrder(10);
this.birdReadyAction();
this.bird.setZOrder(20);
this.readyNode.setVisible(true);
this.overNode.setVisible(false);
for (var i = 0; i < 30; i++) {
this.newHose(i);
}
}
点击屏幕，小鸟向上飞60dp,然后更快的速度下落（移动动画），同时闪动翅膀（帧动画）；
MainLayer.prototype.birdRiseAction = function ()
{
var riseHeight = 60;
var birdX = this.bird.getPositionX();
var birdY = this.bird.getPositionY();
var time = birdY / 600;
var actionFrame = cc.Animate.create(cc.AnimationCache.getInstance().getAnimation("fly"));
var flyAction = cc.Repeat.create(actionFrame, 90000);
var riseAction1 = cc.MoveTo.create(0.2, cc.p(birdX, birdY + riseHeight));
var riseAction2 = cc.RotateTo.create(0, -30);
var riseAction = cc.Spawn.create(riseAction1, riseAction2);
var fallAction1 = cc.MoveTo.create(time, cc.p(birdX, 50));
var fallAction2 = cc.Sequence.create(cc.DelayTime.create(time / 6), cc.RotateTo.create(0, 30));
var fallAction = cc.Spawn.create(fallAction1, fallAction2);
this.bird.stopAllActions();
this.bird.runAction(cc.Spawn.create(
cc.Sequence.create(riseAction, cc.DelayTime.create(0.1), fallAction),
flyAction)
);
}
检测碰撞，如果小鸟碰到地面和水管，发生碰撞，这里碰撞直接用cocos2d-x 里面的图片和图片交叉函数 cc.rectIntersectsRect；
MainLayer.prototype.checkCollision = function ()
{
if (this.bird.getPositionY() < 60) {
cc.log("floor");
this.birdFallAction();
return;
}
for (var i = 0; i < this.hoseSpriteList.length; i++) {
var hose = this.hoseSpriteList[i];
if (!this.isInScreen(hose)) {
// continue;
}
if (cc.rectIntersectsRect(hose.getBoundingBox(), this.bird.getBoundingBox())) {
cc.log("hose positionX==" + hose.getBoundingBox().x);
cc.log("this.bird positionX==" + this.bird.getBoundingBox().x);
cc.log("i==" + i);
cc.log("birdFallAction");
this.birdFallAction();
return;
}
}
}
碰撞后，小鸟先下落，游戏结束场景显示；
MainLayer.prototype.birdFallAction = function ()
{
this.gameMode = OVER;
this.bird.stopAllActions();
this.ground.stopAllActions();
var birdX = this.bird.getPositionX();
var birdY = this.bird.getPositionY();
var time = birdY / 2000;
this.bird.runAction(cc.Sequence.create(
cc.DelayTime.create(0.1),
cc.Spawn.create(cc.RotateTo.create(time, 90), cc.MoveTo.create(time, cc.p(birdX, 50))))
);
this.overNode.setVisible(true);
}
游戏的难度主要在于多个水管的移动，小鸟触摸动画，检测碰撞，我把Mainlayer.js所有代码贴出来；
FP_MAIN_TEXTURE = {
FRAME_ANIMS: "beanstalk/Resources/bs_main_anims.plist",
HOSE: ["holdback1.png", "holdback2.png"]
}
READY = 1;
START = 2;
OVER = 3;
var MainLayer = function ()
{
cc.log("MainLayer");
this.bird = this.bird || {};
this.ground = this.ground || {};
this.hoseNode = this.hoseNode || {};
this.readyNode = this.readyNode || {};
this.overNode = this.overNode || {};
this.passTime = 0;
this.hoseSpriteList = [];
this.isStart = false;
this.gameMode = READY;
};
MainLayer.prototype.onDidLoadFromCCB = function ()
{
if (sys.platform == 'browser') {
this.onEnter();
}
else {
this.rootNode.onEnter = function ()
{
this.controller.onEnter();
};
}
this.rootNode.schedule(function (dt)
{
this.controller.onUpdate(dt);
});
this.rootNode.onExit = function ()
{
this.controller.onExit();
};
this.rootNode.onTouchesBegan = function (touches, event)
{
this.controller.onTouchesBegan(touches, event);
return true;
};
this.rootNode.onTouchesMoved = function (touches, event)
{
this.controller.onTouchesMoved(touches, event);
return true;
};
this.rootNode.onTouchesEnded = function (touches, event)
{
this.controller.onTouchesEnded(touches, event);
return true;
};
this.rootNode.setTouchEnabled(true);
};
MainLayer.prototype.onEnter = function ()
{
cc.AnimationCache.getInstance().addAnimations("Resources/flappy_frame.plist");
this.groundRun();
this.ground.setZOrder(10);
this.birdReadyAction();
this.bird.setZOrder(20);
this.readyNode.setVisible(true);
this.overNode.setVisible(false);
for (var i = 0; i < 30; i++) {
this.newHose(i);
}
}
MainLayer.prototype.newHose = function (num)
{
var hoseHeight = 830;
var acrossHeight = 300;
var downHeight = 100 + getRandom(400);
var upHeight = 1100 - downHeight - acrossHeight;
var hoseX = 400 * num;
var HoseName = FP_MAIN_TEXTURE.HOSE;
var ccSpriteDown = cc.Sprite.createWithSpriteFrameName(HoseName[0]);
ccSpriteDown.setZOrder(1);
ccSpriteDown.setAnchorPoint(cc.p(0, 0));
ccSpriteDown.setPosition(cc.p(hoseX, 0));
ccSpriteDown.setScaleY(downHeight / hoseHeight);
var ccSpriteUp = cc.Sprite.createWithSpriteFrameName(HoseName[1]);
ccSpriteUp.setZOrder(1);
ccSpriteUp.setAnchorPoint(cc.p(0, 0));
ccSpriteUp.setPosition(cc.p(hoseX, downHeight + acrossHeight));
ccSpriteUp.setScaleY(upHeight / hoseHeight);
this.hoseNode.addChild(ccSpriteDown);
this.hoseNode.addChild(ccSpriteUp);
this.hoseSpriteList.push(ccSpriteDown);
this.hoseSpriteList.push(ccSpriteUp);
return null;
}
MainLayer.prototype.groundRun = function ()
{
var action1 = cc.MoveTo.create(0.5, cc.p(-120, 0));
var action2 = cc.MoveTo.create(0, cc.p(0, 0));
var action = cc.Sequence.create(action1, action2);
this.ground.runAction(cc.RepeatForever.create(action));
}
MainLayer.prototype.birdReadyAction = function ()
{
var birdX = this.bird.getPositionX();
var birdY = this.bird.getPositionY();
var time = birdY / 2000;
var actionFrame = cc.Animate.create(cc.AnimationCache.getInstance().getAnimation("fly"));
var flyAction = cc.Repeat.create(actionFrame, 90000);
this.bird.runAction(cc.Sequence.create(
flyAction)
);
}
MainLayer.prototype.birdFallAction = function ()
{
this.gameMode = OVER;
this.bird.stopAllActions();
this.ground.stopAllActions();
var birdX = this.bird.getPositionX();
var birdY = this.bird.getPositionY();
var time = birdY / 2000;
this.bird.runAction(cc.Sequence.create(
cc.DelayTime.create(0.1),
cc.Spawn.create(cc.RotateTo.create(time, 90), cc.MoveTo.create(time, cc.p(birdX, 50))))
);
this.overNode.setVisible(true);
}
MainLayer.prototype.birdRiseAction = function ()
{
var riseHeight = 60;
var birdX = this.bird.getPositionX();
var birdY = this.bird.getPositionY();
var time = birdY / 600;
var actionFrame = cc.Animate.create(cc.AnimationCache.getInstance().getAnimation("fly"));
var flyAction = cc.Repeat.create(actionFrame, 90000);
var riseAction1 = cc.MoveTo.create(0.2, cc.p(birdX, birdY + riseHeight));
var riseAction2 = cc.RotateTo.create(0, -30);
var riseAction = cc.Spawn.create(riseAction1, riseAction2);
var fallAction1 = cc.MoveTo.create(time, cc.p(birdX, 50));
var fallAction2 = cc.Sequence.create(cc.DelayTime.create(time / 6), cc.RotateTo.create(0, 30));
var fallAction = cc.Spawn.create(fallAction1, fallAction2);
this.bird.stopAllActions();
this.bird.runAction(cc.Spawn.create(
cc.Sequence.create(riseAction, cc.DelayTime.create(0.1), fallAction),
flyAction)
);
}
MainLayer.prototype.onUpdate = function (dt)
{
if (this.gameMode != START) {
return;
}
this.passTime += dt;
this.hoseNode.setPositionX(800 - 200 * this.passTime);
this.bird.setPositionX(-500 + 200 * this.passTime);
this.checkCollision();
}
MainLayer.prototype.checkCollision = function ()
{
if (this.bird.getPositionY() < 60) {
cc.log("floor");
this.birdFallAction();
return;
}
for (var i = 0; i < this.hoseSpriteList.length; i++) {
var hose = this.hoseSpriteList[i];
if (!this.isInScreen(hose)) {
// continue;
}
if (cc.rectIntersectsRect(hose.getBoundingBox(), this.bird.getBoundingBox())) {
cc.log("hose positionX==" + hose.getBoundingBox().x);
cc.log("this.bird positionX==" + this.bird.getBoundingBox().x);
cc.log("i==" + i);
cc.log("birdFallAction");
this.birdFallAction();
return;
}
}
}
MainLayer.prototype.isInScreen = function (sprite)
{
return (sprite.getPositionX() > 0 && sprite.getPositionX() < 720);
}
MainLayer.prototype.onExitClicked = function ()
{
}
MainLayer.prototype.onStartClicked = function ()
{
cc.Director.getInstance().resume();
cc.BuilderReader.runScene("", "MainLayer");
}
MainLayer.prototype.onExit = function ()
{
cc.log("onExit");
}
MainLayer.prototype.onTouchesBegan = function (touches, event)
{
var loc = touches[0].getLocation();
}
MainLayer.prototype.onTouchesMoved = function (touches, event)
{
}
MainLayer.prototype.onTouchesEnded = function (touches, event)
{
if (this.gameMode == OVER) {
return;
}
if (this.gameMode == READY) {
this.gameMode = START;
this.readyNode.setVisible(false);
}
var loc = touches[0].getLocation();
this.birdRiseAction();
}
function isInRect(ccRect, ccTouchBeganPos)
{
if (ccTouchBeganPos.x > ccRect.x && ccTouchBeganPos.x < (ccRect.x + ccRect.width)) {
if (ccTouchBeganPos.y > ccRect.y && ccTouchBeganPos.y < (ccRect.y + ccRect.height)) {
return true;
}
}
return false;
}
function getRandom(maxSize)
{
return Math.floor(Math.random() * maxSize) % maxSize;
}
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