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SpriteAction_SineWave.cpp

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//*** SpriteAction_SineWave.cpp ***
 
#include "SpriteAction_SineWave.h"
#include "ColorHelper.h"
#include "Sprite.h"
#include "SpriteController.h"


//*** Constructor ***

SpriteAction_SineWave::SpriteAction_SineWave(float amplitudeX, float offsetX, float frequencyX, float amplitudeY, float offsetY, float frequencyY, float easeIn):
   amplitudeX_(amplitudeX),
   offsetX_(offsetX),
   frequencyX_(frequencyX),
   amplitudeY_(amplitudeY),
   offsetY_(offsetY),
   frequencyY_(frequencyY),
   easeIn_(easeIn),
   perpetual_(true),
   time_(0),
   easeOut_(0),
   elapsedTime_(0)
   {
   }


//*** Constructor ***

SpriteAction_SineWave::SpriteAction_SineWave(float amplitudeX, float offsetX, float frequencyX, float amplitudeY, float offsetY, float frequencyY, float time, float easeIn, float easeOut):
   amplitudeX_(amplitudeX),
   offsetX_(offsetX),
   frequencyX_(frequencyX),
   amplitudeY_(amplitudeY),
   offsetY_(offsetY),
   frequencyY_(frequencyY),
   easeIn_(easeIn),
   perpetual_(false),
   time_(time),
   easeOut_(easeOut),
   elapsedTime_(0)
   {
   }


//*** Setup ***

void SpriteAction_SineWave::Setup(SpriteController* controller, Sprite* sprite)
   {
   if (time_==0)
      {
      perpetual_=true;
      }
   }


//*** Update ***

void SpriteAction_SineWave::Update(SpriteController* controller, Sprite* sprite, float deltaTime)
   {
   elapsedTime_+=deltaTime;
   
   if (!perpetual_ && elapsedTime_>time_)
      {  
      ActionCompleted();
      return;
      }

   float scale=1.0f;
   if (elapsedTime_<easeIn_)
      {
      scale=elapsedTime_/easeIn_;
      }
   else if (!perpetual_ && elapsedTime_>time_-easeOut_)
      {
      scale=1.0f-(elapsedTime_-(time_-easeOut_))/easeOut_;
      }

   float xOffset=Sin(elapsedTime_*frequencyX_+ToRadians(offsetX_))*amplitudeX_*scale;
   float yOffset=Sin(elapsedTime_*frequencyY_+ToRadians(offsetY_))*amplitudeY_*scale;

   controller->AddOffset(xOffset,yOffset);
   }

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