【cocos2d-x笔记】滚动字幕_cocos2d-x 3.x visit setscissorinpoints-优快云博客

本文提供了一个使用裁剪框技术在Cocos2d中实现滚动字幕的代码示例，包括裁剪框的创建、位置调整及滚动字幕的更新方法。

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使用裁剪框来做滚动字幕，代码如下

#include "cocos2d.h"

USING_NS_CC;


// 裁剪框
class TailorView : public CCLayer
{
public:
	virtual void visit(void);
	static TailorView* create(const CCSize &size);
private:
};

#include "TailorView.h"


//裁剪框
void TailorView::visit( void )
{
	glEnable(GL_SCISSOR_TEST);              // 开启显示指定区域
	float x = this->getPositionX();
	float y = this->getPositionY();
	float n_width = this->getContentSize().width;
	float n_height = this->getContentSize().height;
	CCPoint p = this->convertToWorldSpace(ccp(0,0));
	CCPoint pw = this->convertToWorldSpace(ccp(n_width,n_height));
	CCDirector::sharedDirector()->getOpenGLView()->setScissorInPoints(p.x, p.y,pw.x-p.x, pw.y-p.y);
	CCLayer::visit();
	glDisable(GL_SCISSOR_TEST);

}

TailorView* TailorView::create( const CCSize &size)
{
	TailorView* pLayer = new TailorView();
	pLayer->setAnchorPoint( ccp(0,0));
	pLayer->setContentSize(size);
	pLayer->setPosition( 0,0);
	pLayer->autorelease();
	return pLayer;

}

直接创建CCLabelTTF添加到 TailorView 就好了！使用update来更新CCLabelTTF的位置