Cocos2D-X閃亮標題實現

Cocos2D-X閃亮標題實現最終效果圖：

實現方法:

主要依懶ClippingNode類

需要的素材有:

顯示標題，又作為stencil（模板)

光束(beam)....就是純白色加點透明....可能看不出來

代碼實現

1.添加標題

//標題
 auto title = Sprite::create("BeamTitle/title.png");
 title->setAnchorPoint(Vec2(0.5f, 0.5f));
 title->setPosition(Vec2(visibleSize.width / 2, visibleSize.height / 6 * 5));
 this->addChild(title);

2,加ClippingNode

ClippingNode需要設置三個內容

模板(Node *類型)，這裡是標題，第一張圖，不會被顯示

顯示目標(ClippingNode 的子節點)，這裡是光束，第二張圖

設置AlphaThresHold的值，簡單點的說就是透明度，只有當模板透明度大於這個值時，顯示目標才會繪制

//clippingNode
 auto titleStencil = Sprite::create("BeamTitle/title.png");
 auto clipTitle = ClippingNode::create(titleStencil);
 clipTitle->setAnchorPoint(Vec2(0.5f, 0.5f));
 clipTitle->setPosition(Vec2(visibleSize.width / 2, visibleSize.height / 6 * 5));
 clipTitle->setAlphaThreshold(0.0f);
 this->addChild(clipTitle);
 //Beam 光束
 auto beam = Sprite::create("BeamTitle/beam.png");
 beam->setAnchorPoint(Vec2(0.5f, 0.5f));
 auto toRight = MoveTo::create(0.5f, Vec2(200, 50));
 auto toLeft = MoveTo::create(0.5f, Vec2(-200, 50));
 auto seq = Sequence::create(toRight, toLeft, nullptr);
 auto move = RepeatForever::create(seq);
 beam->runAction(move);
 clipTitle->addChild(beam);

代碼中,ClippingNode的AlphaThresHold值被設置為0.0f,標題的完全透明部分的透明度也為0.0f.所以beam在透明部分不會被顯示。

額外例子

最下面的滾動條是用來設置AlphaThresHold

中間使用的模板是

增加AlphaThresHold的值，圖片顯示的內容越來越少。

完整代碼

BeamTitle.h

#ifndef __BEAM__TITLE__CPP__
#define  __BEAM__TITLE__CPP__
#include "cocos2d.h"
#include "ui/UISlider.h"
class BeamTitle :public cocos2d::Layer{
public:
 /*
  *三個構造相關函數
  */
 static cocos2d::Scene* createScene();
 CREATE_FUNC(BeamTitle);
 bool init();
private:
 /*
  *滑動條函數
  */
 void sliderEvent(cocos2d::Ref *pSender, cocos2d::ui::Slider::EventType type);
private:
 cocos2d::ClippingNode *clip;
 cocos2d::Label *label;
};
#endif

BeamTitle.cpp

#include "BeamTitle.h"
#include "BackLayer.h"
#include "ui/UISlider.h"
USING_NS_CC;
using namespace ui;
Scene *BeamTitle::createScene(){
 auto *back = BackLayer::create();
 Layer *layer = BeamTitle::create();
 Scene*scene = Scene::create();
 scene->addChild(back);
 scene->addChild(layer);
 return scene;
}
bool BeamTitle::init(){
 if (!Layer::init())
  return false;
 auto visibleSize = Director::getInstance()->getVisibleSize();
 //標題
 auto title = Sprite::create("BeamTitle/title.png");
 title->setAnchorPoint(Vec2(0.5f, 0.5f));
 title->setPosition(Vec2(visibleSize.width / 2, visibleSize.height / 6 * 5));
 this->addChild(title);
 //clippingNode
 auto titleStencil = Sprite::create("BeamTitle/title.png");
 auto clipTitle = ClippingNode::create(titleStencil);
 clipTitle->setAnchorPoint(Vec2(0.5f, 0.5f));
 clipTitle->setPosition(Vec2(visibleSize.width / 2, visibleSize.height / 6 * 5));
 clipTitle->setAlphaThreshold(0.0f);
 this->addChild(clipTitle);
 //Beam 光束
 auto beam = Sprite::create("BeamTitle/beam.png");
 beam->setAnchorPoint(Vec2(0.5f, 0.5f));
 auto toRight = MoveTo::create(0.5f, Vec2(200, 50));
 auto toLeft = MoveTo::create(0.5f, Vec2(-200, 50));
 auto seq = Sequence::create(toRight, toLeft, nullptr);
 auto move = RepeatForever::create(seq);
 beam->runAction(move);
 clipTitle->addChild(beam);
 //滑動條
 auto slider = Slider::create();
 slider->loadBarTexture("BeamTitle/sliderTrack.png");
 slider->loadProgressBarTexture("BeamTitle/sliderProgress.png");
 slider->loadSlidBallTextures("BeamTitle/sliderThumb.png", "BeamTitle/sliderThumb.png","");
 slider->setPosition(Vec2(visibleSize.width / 2, visibleSize.height / 8));
 slider->addEventListener(CC_CALLBACK_2(BeamTitle::sliderEvent, this));
 this->addChild(slider);
 /*
  *ClippingNode
  */
 //模板
 auto stencil = Sprite::create("BeamTitle/stencil.png");
 //顯示對象 貓
 auto cat = Sprite::create("BeamTitle/cat.png");
 clip = ClippingNode::create(stencil);
 clip->setAlphaThreshold(1.0f);
 clip->addChild(cat);
 clip->setPosition(visibleSize / 2);
 this->addChild(clip);
 //label 顯示透明度 即 AlphaThreshold
 label = Label::createWithBMFont("BeamTitle/bitmapFontTest2.fnt", "1.0f");
 label->setScale(0.5f);
 label->setPosition(Vec2(visibleSize.width / 2, visibleSize.height / 5));
 this->addChild(label);
 return true;
}
void BeamTitle::sliderEvent(Ref *pSender, Slider::EventType type){
 if (type == Slider::EventType::ON_PERCENTAGE_CHANGED)
 {
  Slider* slider = dynamic_cast<Slider*>(pSender);
  int percent = slider->getPercent(); 
  clip->setAlphaThreshold(1.0f*percent / 100);
  char str[30];
  sprintf(str, "AlphaThresHold=%f", 1.0f*percent / 100);
  label->setString(str);
  printf("AlphaThresHold=%f", clip->getAlphaThreshold());
 }
}

剖析cocos2d-x之Action實現 http://www.linuxidc.com/Linux/2013-04/82436.htm

Ubuntu下cocos2d-x開發環境搭建及配置 http://www.linuxidc.com/Linux/2013-03/81876.htm

Cocos2d-x3.2實現虛擬搖桿多點觸摸 http://www.linuxidc.com/Linux/2014-09/106551.htm

Ubuntu 14.04搭建Cocos2d-x2.2.5開發環境圖文詳解 http://www.linuxidc.com/Linux/2014-10/108108.htm

Cocos2D-X 的詳細介紹：請點這裡
Cocos2D-X 的下載地址：請點這裡