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SpriteAction_ColorFade.cpp

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//*** SpriteAction_ColorFade.cpp ***
 
#include "SpriteAction_ColorFade.h"
#include "ColorHelper.h"
#include "Sprite.h"
#include "StandardLibrary.h"


//*** Constructor ***

SpriteAction_ColorFade::SpriteAction_ColorFade(unsigned short targetColor, float time):
   targetColor_(targetColor),
   time_(time),
   elapsedTime_(0),
   sourceR_(0),
   sourceG_(0),
   sourceB_(0),
   targetR_(0),
   targetG_(0),
   targetB_(0),
   deltaR_(0),
   deltaG_(0),
   deltaB_(0)
   {
   if (time_<=0)
      {
      time_=FLOAT_EPSILON;
      }
   }


//*** Setup ***

void SpriteAction_ColorFade::Setup(SpriteController* controller, Sprite* sprite)
   {
   unsigned short sourceColor=sprite->GetColor();
   sourceR_=RGB16TOFLOATR(sourceColor);
   sourceG_=RGB16TOFLOATG(sourceColor);
   sourceB_=RGB16TOFLOATB(sourceColor);

   targetR_=RGB16TOFLOATR(targetColor_);
   targetG_=RGB16TOFLOATG(targetColor_);
   targetB_=RGB16TOFLOATB(targetColor_);

   deltaR_=(targetR_-sourceR_)/time_;
   deltaG_=(targetG_-sourceG_)/time_;  
   deltaB_=(targetB_-sourceB_)/time_;
   }


//*** Update ***

void SpriteAction_ColorFade::Update(SpriteController* controller, Sprite* sprite, float deltaTime)
   {
   elapsedTime_+=deltaTime;
   
   if (elapsedTime_>time_)
      {  
      sprite->SetColor(targetColor_);
      ActionCompleted();
      return;
      }

   float r=sourceR_+deltaR_*elapsedTime_;
   float g=sourceG_+deltaG_*elapsedTime_;
   float b=sourceB_+deltaB_*elapsedTime_;

   unsigned short color=FLOATTORGB16(r,g,b);
   sprite->SetColor(color);
   }

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