class GUIControl{
  String label;
  float angle;
  float cos, sin;
  int start, stop;
  int radius = 10;
  float value,minVal,maxVal;
  //-----------
  GUIControl(String label,int i, float minVal, float maxVal, float value){
    this.label = label;
    this.minVal = minVal;
    this.maxVal = maxVal;
    this.value = value;
    start = 17;
    stop = 35;
    angle = -0.7 + 0.4*i;
    cos = cos(angle);
    sin = sin(angle);
  }
  //-----------
  void mouseHover(float dx,float dy){
    float v = atan2( dy, dx );
    float d = mag(dx, dy);
    if( abs(v-angle) < 0.2 && d<=stop && d>=start ) 
      text(label,6+(int)(stop*cos),2+(int)(stop*sin));
  }
  //-----------
  void mouseInput(float dx,float dy){
    float v = atan2( dy, dx );
    float d = mag(dx, dy);
    if( abs(v-angle) < 0.2 && d<=stop && d>=start ) 
      value = (maxVal-minVal)*(d-start)/(stop-start) + minVal;
  }
  //-----------
  void setValue(float x){
    value = x;
  }
  //-----------
  float getValue(){
    return value;
  }
  //-----------
  void draw(){
    strokeWeight(5);
    stroke(128,128);
    line( start*cos, start*sin, stop*cos, stop*sin );
    float r = start + (stop-start)*value/(maxVal-minVal);
    stroke(128);
    line( start*cos, start*sin, r*cos, r*sin );
  }
}