cocos2dx rect着色（cocos2dx怎么得到一个指定layer）

本文目录

• cocos2dx怎么得到一个指定layer
• cocos2d-x 和cocos2d 中CCRectContainsPoint的不同
• 关于cocos2d中的intersectsRect问题
• cocos2dx怎么过滤掉spritesheet的背景色
• cocos2dx精灵帧加载出问题

cocos2dx怎么得到一个指定layer

--创建一个touch的半透明layer--priority : touch 权限级别,默认为-1024--touchRect: 在touchRect 区域会放行touch事件 若touchRect = nil 则全屏吃touch--touchCallback: 屏蔽层touch 回调function createMaskLayer( priority,touchRect ,touchCallback, layerOpacity,highRect) local layer = CCLayer:create() layer:setPosition(ccp(0, 0)) layer:setAnchorPoint(ccp(0, 0)) layer:setTouchEnabled(true) layer:setTouchPriority(priority or -1024) layer:registerScriptTouchHandler(function ( eventType,x,y ) if(eventType == "began") then if(touchRect == nil) then if(touchCallback ~= nil) then touchCallback() end return true else if(touchRect:containsPoint(ccp(x,y))) then return false else if(touchCallback ~= nil) then touchCallback() end return true end end end print(eventType) end,false, priority or -1024, true) local gw,gh = g_winSize.width, g_winSize.height if(touchRect == nil) then local layerColor = CCLayerColor:create(ccc4(0,0,0,layerOpacity or 150),gw,gh) layerColor:setPosition(ccp(0,0)) layerColor:setAnchorPoint(ccp(0,0)) layer:addChild(layerColor) return layer else local ox,oy,ow,oh = touchRect.origin.x, touchRect.origin.y, touchRect.size.width, touchRect.size.height local layerColor = CCLayerColor:create(ccc4(0, 0, 0, layerOpacity or 150 ), gw, gh) local clipNode = CCClippingNode:create(); clipNode:setInverted(true) clipNode:addChild(layerColor) local stencilNode = CCNode:create() -- stencilNode:retain() local node = CCScale9Sprite:create("bg.png"); node:setContentSize(CCSizeMake(ow, oh)) node:setAnchorPoint(ccp(0, 0)) node:setPosition(ccp(ox, oy)) stencilNode:addChild(node) if(highRect ~= nil) then local highNode = CCScale9Sprite:create("bg.png"); highNode:setContentSize(CCSizeMake(highRect.size.width, highRect.size.height)) highNode:setAnchorPoint(ccp(0, 0)) highNode:setPosition(ccp(highRect.origin.x, highRect.origin.y)) stencilNode:addChild(highNode) end clipNode:setStencil(stencilNode) clipNode:setAlphaThreshold(0.5) layer:addChild(clipNode) end return layerend

cocos2d-x 和cocos2d 中CCRectContainsPoint的不同

cocos2d是OC写的，cocos2dx是c++写的cocos2d只能在ios下运行，cocos2dx是跨平台的，ios和android平台都可以运行cocos2d是外国人搞的，cocos2dx是中国人搞的。cocos2dx是cocos2d的C++写法，但是游戏架构是一样的，都包含了精灵，导演，场景，动作等概念，他们是一脉相承的东西。你可以直接研究cocos2dx，没有什么障碍。虽然是有了cocos2d才有的cocos2dx，但是cocos2dx包含了cocos2d的主要思想，因此可以直接研究cocos2dx。

关于cocos2d中的intersectsRect问题

你自己选中以后，按F12 ,追踪进去看一下，他不是Layer也是sprite ，就相当于是一个矩形检测是否碰撞

cocos2dx怎么过滤掉spritesheet的背景色

Here’s an explanation of the keys.frameThe sprite location within the sprite-sheet as position and size values.offsetMost of the current texture packing tools remove transparent areas of the image before they pack it. Imagine you got a sprite with the size of 100x100, but on the left and right there are 4 columns of totally transparent pixels. The packing tool will remove these to save space, but store offset andsourceSize, so that your sprite will be 100x100 pixels in your game. Note that the offset is always relative to the center of the sprite (comparing the center of the cropped and the center of the original sprite).rotatedWhether or not the sprite has been rotated within the sprite-sheet (if this is true, the sprite is rotated 90 degrees clockwise).sourceColorRectThe rectangle with actual color information inside your source sprite. If you take the 100x100 image described above (with 4px transparent pixels on the left and on the right), the sourceColorRect will be {{4,0},{92,100}}sourceSizeThis is the size of the original sprite (beware that some texture-packers can add padding to this if you chose to).个人理解：sourceSize:动画的尺寸，如果一个动画有很多帧的话，所有帧的sourceSize是不变的，基本上可以理解为这么多帧中最大显示范围的那个尺寸frame：标示这一帧的截图，在整个spritesheet中的位置和尺寸offset：标示这个截图的中心点，和整个动画的中心点（以sourceSize这个方形的中心点），的xy差值，记得这个是以cocos2d的坐标系为准的，y轴向上为正sourceColorRect这个截图在sourceSize这个方形的位置和尺寸（均以左上角来算）值得注意的是：搜索一下realTextureFileName和textureFileName，这两个key下面的string属性必须是对应spritesheet的文件名！有时候改了plist和png的文件名，忘记改这俩个值，则会加载不了图片

cocos2dx精灵帧加载出问题

先CCTexture2D* EntityTexture=CCTextureCache::sharedTextureCache()-》addImage(addr);再frame=CCSpriteFrame::createWithTexture(EntityTexture,cocos2d::CCRectMake(0,0,x,y));加载资源的问题一般都会在输出中有错误提示的