Cocos2dx内的坐标系(Coordinate Systems In Cocos2dx)

理解OpenGL与纹理坐标系在游戏开发中的应用

最新推荐文章于 2017-05-15 14:23:58 发布

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本文深入探讨了窗口坐标系与纹理坐标系在游戏开发中的作用，通过代码实例展示了如何使用图集创建精灵，并解释了坐标系在这一过程中的重要性。

窗口坐标系：即openGL坐标系，左下角为原点，向右是x正方向，向上是y正方向。

纹理坐标系：左上角为原点，向右是x正方向，向下是y正方向。在使用图集时，例如截取其中的某个矩形块来创建一个sprite会用到此坐标系。

Window Coordinate System: which uses the openGL coordinate system, has an origin at the left bottom corner, x increases towards the rightside and y increases towards the upside.

Texture Coordinate System: which has an origin at the top left corner, with x increasing towards the rightside and y increasing towards the downside.This coordinate system will be used when you use a tileset, like using a rect from it to create a sprite.

code example:

CCSpriteBatchNode* batchnode = CCSpriteBatchNode::create("data/tileset/grass.png");
CCSprite* sprite= CCSprite::createWithTexture(batchnode->getTexture(), CCRectMake(0,0,48,32));
batchnode->addChild(bnsprite);
this->addChild(batchnode);

The second line in this code fragment, created an sprite,using a 48*32 rect on the top left corner of the texture.