基于像素的碰撞检测(移植到cocos2dx 3.x)(基于像素的分类方法)

感谢原文： 2.x的，我修改了一下，这个版本是Cocos2d-x 3.x可用版本。Pixel Perfect Collision Detection (Using Cocos2d-x 3.x)This post found its way because I couldnt find the answer to one of the questions I asked on StackOverflow ( and thought there would be others like me in search for an answer.Collision detection is an integral part of almost all games. It is used to find when a bullet hits an enemy or when you bump into a wall etc.There are many different requirements when we do collision detection and depending on our game we choose one of the many detection techniques.The default Collision detection mechanism used by games and provided in almost all game engines and frameworks is a “Bounding Box” collision.Simply put, a “Bounding Box” collision detection system the sprites/objects being checked for collision are treated as the smallest rectangle which completely engulfs them. Then these two Boxes are checked if they are colliding with each other.But sometimes this very simple collision detection system is not accurate. Specially when we use sprites with alpha values (mostly png files) or when our objects are rotated by some angles. See the image below: Pixel – Perfect collision detection is a system where we check if the objects concerned are actually colliding rather than just being part of a bounding box which is bigger than their size. WARNING: This system though more accurate is obviously more performance intensive and hence depending on your game requirements choose wisely about which of the different systems you want to use.TIP: This system though written specially for Cocos2d-x framework can be easily understood and implemented for any language/framework you are using.So its time to get our hands dirty,We are going to develop a Singleton Class for collision detection and just plug and play this in any project we are doing.Things used:1. Singleton Class – CollisionDetection2. Opengl Vertex and Fragment Shaders3. CCRenderTexture Class – Cocos2d-xTheory:1. Create a CCRenderTexture which is going to serve as a secondary draw buffer.2. We first do a simple collision detection (Bounding Box) to check if the two sprite’s bounds are colliding3. If step 2 is a success then we are going to draw the two concerned objects in our secondary buffer we created in step 1. (We are going to set its visibility to false, so that even though we draw something, nothing will we visible to the end user)4. Using openGL fragment shaders we are going to draw one of the objects completely RED and the other completely BLUE! 5. Using another of openGL functionality glReadPixels we are going to read the pixels data of all the pixels in the Rectangular area (Intersection area) of the bounding box collision6. We are then going to loop through all the pixel values and check if a single pixel has BOTH the RED and the BLUE pixels. If they have then the objects are actually colliding or else not.Now here is the code for the above steps. I have commented the code for you to understand what is going on. If there are any questions please leave in the comments and I will try and answer to the best of my knowledge

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CollisionDetection.h

CollisionDetection.cpp

SolidColorShader.fsh

SolidVertexShader.vsh

For using the Collision Detection Class:

1. Initialize the CCRenderTexture object

2. Call the Singleton function whenever collision detection required

cocos2dx 3.2 读写XML，基于tinyxml2封装的易使用，更灵活的XML接口。中文国际化。 简介cocos2dx3.2读写XML使用的是tinyxml2库。tinyxml2是一个轻量的解析XML的开源库，C编写，跨平台，内存占用很小。解析文件时，在内存中生成DOM模型，即文

cocos2dx onpause崩 原文：

cocos2dx3.2 xcode中资源路径设置问题 在xcode中，将资源分类，然后将各自的文件夹添加到Resources,运行程序的时候老是报错，说是找不懂资源，原因就是找不到资源路径。那么如何设置呢？1