获取游戏设计的分辨率与真实设备的比例,并根据值来剪切显示区域

 1 /*************************************
 2 *函数名称：visit
 3 *函数功能：获取游戏设计的分辨率与真实设备的比例,并根据值来剪切显示区域
 4 *函数参数：void 
 5 *函数返回值：void 
 6 *笔记：
 7 1.glEnable用于开启opengl相应的功能
 8 2.GL_SCISSOR_TEST根据函数glScissor设置，启用图形剪切
 9 3.glScissor
10 http://blog.csdn.net/augusdi/article/details/7282214
11 *************************************/
12 void CXSroll::visit()
13 {
14     glEnable(GL_SCISSOR_TEST);
15 
16     CCRect tPrtScr(0, 0, 0, 0);
17     if (this->getParent())
18     {
19         tPrtScr.origin = this->getParent()->convertToWorldSpace(this->getPosition());
20     }
21     else
22     {
23         tPrtScr.origin = this->getPosition();
24     }
25 
26     tPrtScr.size.width = this->getContentSize().width;
27     tPrtScr.size.height = this->getContentSize().height;
28 
29     //获取游戏设计的分辨率与真实设备的比例
30     tPrtScr.origin.x /= CCDirector::sharedDirector()->getWinSize().width / CCDirector::sharedDirector()->getOpenGLView()->getFrameSize().width;
31     tPrtScr.origin.y /= CCDirector::sharedDirector()->getWinSize().height / CCDirector::sharedDirector()->getOpenGLView()->getFrameSize().height;
32     tPrtScr.size.width /= CCDirector::sharedDirector()->getWinSize().width / CCDirector::sharedDirector()->getOpenGLView()->getFrameSize().width;
33     tPrtScr.size.height /= CCDirector::sharedDirector()->getWinSize().height / CCDirector::sharedDirector()->getOpenGLView()->getFrameSize().height;
34 
35     glScissor( tPrtScr.origin.x, tPrtScr.origin.y, tPrtScr.size.width, tPrtScr.size.height);
36 
37     CXWindow::visit();
38     glDisable(GL_SCISSOR_TEST);
39 }