class Param {
  static final int SIZE =  10;
  static final int MIN  =  10;
  static final int MAX  = 180;
  
  float ang;
  float off;
  float x;
  float y;
  
  int col;
  
  boolean tweening;
  float   target;
  
  Param(int _ang, int _col) {
    ang = radians(_ang);
    col = _col;
    off = MAX;
    
    update();
  }
  
  void update() {
    x = calcX(off, ang);//centerX + off * cos(ang);
    y = calcY(off, ang);//centerY + off * sin(ang);
  }

  void draw() {
    if (tweening) {
      off = lerp(off, target, .2);  
      if (abs(off - target) < 1) {
        off = target;
        tweening = false;  
      }
      update();
    }
    
    // draw the handle
    fill(col);
    ellipse(x, y, SIZE, SIZE);
  }
  
  boolean contains(int _px, int _py) {
    return (_px > (x-SIZE) && _px < (x+SIZE) && 
            _py > (y-SIZE) && _py < (y+SIZE));
  }
  
  void tweenTo(float _target) {
    tweening = true;
    target = _target;  
  }
}