1.CCLayerColor是专门用来处理背景颜色的图层,它继承自CCLayer,可以用来设置图层的背景颜色,因为CCLayer默认是透明色的,即无颜色的
2.CCLayerGradient是用来显示颜色渐变效果的图层,它继承自CCLayerColor,是CCLayer的孙类
3.几个特殊的图层:CCLayerColor,CCLayerGradient
颜色图层在游戏中主要用来烘托背景,可以按照RGB设置填充颜色,同时还可以设置图层的透明度,常用于背景
颜色图层还存在一个特殊的子类:CCLayerGradient,是具有颜色渐变效果的颜色图层
可以设置背景的渐变效果,Opacity:透明度
4.相关的处理函数:
bool CCLayerColor::initWithColor(const ccColor4B& color);
bool CCLayerColor::initWithColor(const ccColor4B& color, GLfloat w,GLfloat h);
实例:
CCLayerColor::initWithColor(ccc4(255, 255, 255, 255));
CCLayerColor::initWithColor(ccc4(255, 255, 255, 255),100,100);
ignoreAnchorPointForPosition(false);
bool CCLayerGradient::initWithColor(const ccColor4B& start, const ccColor4B& end);
bool CCLayerGradient::initWithColor(const ccColor4B& start, const ccColor4B& end, const CCPoint& v);
实例:
CCLayerGradient::initWithColor(ccc4(123,89,0,255),
ccc4(0,255,255,255),ccp(1,0));
5.代码实现:
.h文件
#ifndef __T04ColorLayer_H__
#define __T04ColorLayer_H__#include "cocos2d.h"
USING_NS_CC;/*CCLayer默认的背景颜色是透明的,而CCLayerColor图层,可以设置背景颜色*/
class T04ColorLayer :public CCLayerColor
{
public:
static CCScene * scene();
CREATE_FUNC(T04ColorLayer);
bool init();};#endif
.cpp文件
#include "T04ColorLayer.h"/*CCLayerGradient可以设置颜色的渐变梯度,class CCLayerGradient : public CCLayerColor*/
class LayerGradient :public CCLayerGradient
{
public:
CREATE_FUNC(LayerGradient);
bool init()
{
/** Initializes the CCLayer with a gradient between start and end in the direction of v.
virtual bool initWithColor(const ccColor4B& start, const ccColor4B& end, const CCPoint& v);
**/
CCLayerGradient::initWithColor(ccc4(, , , ), ccc4(, , , ), ccp(, )); return true;
}};CCScene *T04ColorLayer::scene()
{
CCScene * scene = CCScene::create(); /*测试背景图层*/
T04ColorLayer * layer = T04ColorLayer::create(); /*测试渐变图层*/
//LayerGradient * layer = LayerGradient::create(); scene->addChild(layer);
return scene;
}
bool T04ColorLayer::init()
{
CCLayerColor::initWithColor(ccc4(, , , ), , ); /*设置不忽略锚点,在CCLayer和CCScene中默认是忽略锚点的,*/
ignoreAnchorPointForPosition(false); return true;
}