cocos2dx-3.2 之 闪电效果

参考闪电特效算法：http://krazydad.com/bestiary/bestiary_lightning.html

算法详细信息可参上述网址

下面直接上代码，这其实就是一个算法问题：

.h文件

#ifndef __HELLO_LIGHTING_H__
#define __HELLO_LIGHTING_H__

#include "cocos2d.h"
USING_NS_CC;

class HelloLighting : public cocos2d::Layer
{
public:
	HelloLighting(void);
	~HelloLighting(void);

	virtual bool init();
	virtual void update(float delta);
	static cocos2d::Scene* createScene();

	CREATE_FUNC(HelloLighting);

	virtual void draw(cocos2d::Renderer *renderer,const cocos2d::Mat4& transform,uint32_t flags);

	void drawLighting(float x1,float y1,float x2,float y2,float displace);

private:
	float curDetail;
	Point pos1;
	Point pos2;
};

#endif //__HELLO_LIGHTING_H__

#include "HelloLighting.h"

HelloLighting::HelloLighting(void)
{
	
}


HelloLighting::~HelloLighting(void)
{
}

cocos2d::Scene* HelloLighting::createScene()
{
	Scene *scene = Scene::create();
	HelloLighting *layer = HelloLighting::create();
	scene->addChild(layer);
	return scene;
}

bool HelloLighting::init()
{
	if ( !CCLayer::init() )
	{
		return false;
	}
	auto winSize = Director::sharedDirector()->getWinSize();

	pos1 = Point(100,winSize.height/2);
	pos2 = Point(winSize.width-100,winSize.height/2);
	curDetail = 5;

	return true;
}

void HelloLighting::update( float delta )
{

}



void HelloLighting::draw(cocos2d::Renderer *renderer,uint32_t flags)
{
	ccDrawColor4B(255,0);
	glLineWidth(1);
	drawLighting(pos1.x,pos1.y,pos2.x,pos2.y,200);  //这里多画几条线就可以看到更多了
}

void HelloLighting::drawLighting( float x1,float displace )
{
	if (displace < curDetail)
	{
		ccDrawLine(ccp(x1,y1),ccp(x2,y2));
	}
	else
	{
		float mid_x = (x2+x1)/2;
		float mid_y = (y2+y1)/2;
		mid_x += (CCRANDOM_0_1() - 0.5) * displace;
		mid_y += (CCRANDOM_0_1() - 0.5) * displace;
		drawLighting(x1,y1,mid_x,mid_y,displace/2);
		drawLighting(x2,y2,displace/2);
	}
}

直接加载这个场景就可以看到效果了，其实效果图跟运行效果还是有差别的，先来欣赏一下吧！

（编辑：李大同）

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