class Fl_Dial : public Fl_Object

There are two subclasses, Fl_Line_Dial and Fl_Fill_Dial.

  Fl_Dial(int x,int y,int w,int h, const char *l = 0);
  int value(float);
  float value() const {return value_;}
  void bounds(float *a, float *b) const {*a = min; *b = max;}
  void bounds(float, float);
  float step() const {return step_;}
  void step(float a) {step_ = a;}
  void angles(short a, short b) {a1=a; a2=b;}
  void direction(uchar d) {direction_ = d;}
  uchar direction() const {return direction_;}