axmol/cocos2dx/misc_nodes/CCMotionStreak.cpp

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#include "CCMotionStreak.h"
#include "CCPointExtension.h"
#include "CCRibbon.h"
namespace cocos2d {

/*
 * Motion Streak manages a Ribbon based on it's motion in absolute space.
 * You construct it with a fadeTime, minimum segment size, texture path, texture
 * length and color. The fadeTime controls how long it takes each vertex in
 * the streak to fade out, the minimum segment size it how many pixels the
 * streak will move before adding a new ribbon segement, and the texture
 * length is the how many pixels the texture is stretched across. The texture
 * is vertically aligned along the streak segemnts. 
 */
//implementation CCMotionStreak

CCMotionStreak * CCMotionStreak::streakWithFade(float fade, float seg, const char *imagePath, float width, float length, ccColor4B color)
{
	CCMotionStreak *pRet = new CCMotionStreak();
	if(pRet && pRet->initWithFade(fade, seg, imagePath, width, length, color))
	{
		pRet->autorelease();
		return pRet;
	}
	CC_SAFE_DELETE(pRet)
	return NULL;
}

bool CCMotionStreak::initWithFade(float fade, float seg, const char *imagePath, float width, float length, ccColor4B color)
{
	m_fSegThreshold = seg;
	m_fWidth = width;
	m_tLastLocation = CCPointZero;
	m_pRibbon = CCRibbon::ribbonWithWidth(m_fWidth, imagePath, length, color, fade);
	this->addChild(m_pRibbon);

	// update ribbon position
	this->schedule(schedule_selector(CCMotionStreak::update), 0);
	return true;
}

void CCMotionStreak::update(ccTime delta)
{
	CCPoint location = this->convertToWorldSpace(CCPointZero);
	m_pRibbon->setPosition(ccp(-1*location.x, -1*location.y));
    float len = ccpLength(ccpSub(m_tLastLocation, location));
	if (len > m_fSegThreshold)
	{
		m_pRibbon->addPointAt(location, m_fWidth);
		m_tLastLocation = location;
	}
	m_pRibbon->update(delta);
}

//MotionStreak - CocosNodeTexture protocol

void CCMotionStreak::setTexture(CCTexture2D* texture)
{
	m_pRibbon->setTexture(texture);
}

CCTexture2D * CCMotionStreak::getTexture()
{
	return m_pRibbon->getTexture();
}

ccBlendFunc CCMotionStreak::getBlendFunc()
{
	return m_pRibbon->getBlendFunc();
}

void CCMotionStreak::setBlendFunc(ccBlendFunc blendFunc)
{
	m_pRibbon->setBlendFunc(blendFunc);
}

CCRibbon * CCMotionStreak::getRibbon()
{
	return m_pRibbon;
}

}// namespace cocos2d