cocos2d-x中实现区域裁剪

来源：互联网发布：mac在美国多少钱一支编辑：程序博客网时间：2024/04/30 15:26

如果要在cocos2d-x中实现区域裁剪，一般要重写 visit函数：

void visit(void);

void MyControl::visit(void)

{

glEnable(GL_SCISSOR_TEST);

const float s = CCDirector::sharedDirector()->getContentScaleFactor();

CCPoint selfPos = this->getPosition();

CCSize selfContentSize = this->getContentSize();

CCLog("selfPos = %d,%d, selfContentSize =%d,%d ,s = %f", selfPos.x, selfPos.y ,selfContentSize.width, selfContentSize.height ,s);

// 如果是自己的锚点是(0.5,0.5)

// glScissor(selfPos.x *s - selfContentSize.width*s * 0.5f,

// selfPos.y * s - selfContentSize.height*s * 0.5f,

// selfContentSize.width*s,

// selfContentSize.height*s);

//自己的锚点是(0,0)

glScissor(selfPos.x *s ,

selfPos.y * s ,

selfContentSize.width*s,

selfContentSize.height*s);

CCNode::visit();//显示父类的内容

glDisable(GL_SCISSOR_TEST);

}

一般是这么写的，但是后面移植到安卓机器上面的时候，发现内容完全显示不出来了，查了些资料，改成如下的实现就好了：

void MyControl::visit(void)

{

glEnable(GL_SCISSOR_TEST);

CCPoint selfPos = this->getPosition();

CCSize selfContentSize = this->getContentSize();

CCLog("selfPos = %d,%d, selfContentSize =%d,%d ,s = %f", selfPos.x, selfPos.y ,selfContentSize.width, selfContentSize.height ,s);

float scaleX = CCEGLView::sharedOpenGLView()->getScaleX();

float scaleY = CCEGLView::sharedOpenGLView()->getScaleY();

CCRect viewPortRect = CCEGLView::sharedOpenGLView()->getViewPortRect();

glScissor(selfPos.x *scaleX + viewPortRect.origin.x ,

selfPos.y * scaleY + viewPortRect.origin.y ,

selfContentSize.width*scaleX,

selfContentSize.height*scaleY);

CCNode::visit();//显示父类的内容

glDisable(GL_SCISSOR_TEST);

}

如上，iOS跟安卓系统都没有问题了，最好这样设置。