class Interpolate {
  
  
  float value;
  float startValue;
  float endValue;  
  int totalFrames;
  int currentFrame;
  int type;
    
  Interpolate(float s, float e, int tf, int t)  {
    this.value = 0;
    this.startValue = s;
    this.endValue   = e;
    this.totalFrames = tf;
    this.currentFrame = 0;
    this.type = t;
  };
  
  void step()  {
    if (this.type == INTERPOLATE_LINEAR)  {
      calculateLinearValue();
    }
    this.currentFrame++;
  }
  
  void calculateLinearValue()  {
      // step is a linear amount along start to end
      float stepValue = (this.endValue - this.startValue) / this.totalFrames;
      this.value = this.startValue + (stepValue * this.currentFrame);
  }
  
  float getValue()  {
    if (this.getFinished())  {
      return this.endValue;
    } else {  
      return this.value;
    }
  }
  
  boolean getFinished()  {
    return (this.currentFrame >= this.totalFrames);
  }
  
  void start()  {
    this.value = this.startValue;
//    println("start: this.value = " + this.value);
  }
  
  void setValue(float v)        {    this.value = v;          }
  void setStartValue(float sv)  {    this.startValue = sv;    }
  float getStartValue()         {    return startValue;    }
  void setEndValue(float ev)    {    this.endValue = ev;      }
  float getEndValue()           {    return this.endValue;      }
  void setTotalFrames(int tf)   {    this.totalFrames = tf;   }
  void setCurrentFrame(int cf)  {    this.currentFrame = cf;  }
  void setType(int t)           {    this.type = t;           }  
};