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SpriteAction_ButtonStateCrossFade.cpp

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//*** SpriteAction_ButtonStateCrossFade.cpp ***
 
#include "SpriteAction_ButtonStateCrossFade.h"
#include "ColorHelper.h"
#include "Sprite.h"
#include "Button.h"


//*** Constructor ***

SpriteAction_ButtonStateCrossFade::SpriteAction_ButtonStateCrossFade(float time):
   time_(time),
   elapsedTime_(0)
   {
   if (time_<=0)
      {
      time_=FLOAT_EPSILON;
      }
   }


//*** Setup ***

void SpriteAction_ButtonStateCrossFade::Setup(SpriteController* controller, Sprite* sprite)
   {
   Button* button=static_cast<Button*>(sprite);
   button->SetStateCrossFadeAlpha(255,0);
   }


//*** Update ***

void SpriteAction_ButtonStateCrossFade::Update(SpriteController* controller, Sprite* sprite, float deltaTime)
   {
   Button* button=static_cast<Button*>(sprite);

   elapsedTime_+=deltaTime;
   
   if (elapsedTime_>time_)
      {  
      button->SetStateCrossFadeAlpha(0,255);
      ActionCompleted();
      return;
      }

   // Handle state crossfade
   if (elapsedTime_<=time_*0.5f)
      {
      float i=elapsedTime_/(time_*0.5f);
      button->SetStateCrossFadeAlpha(255,(unsigned char)(255*i))        ;
      }
   else
      {
      float i=(elapsedTime_-time_*0.5f)/(time_*0.5f);
      button->SetStateCrossFadeAlpha(255-(unsigned char)(255*i),255);
      }
   }

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