Scaler.H

// Scaler.H     $Revision: 1.5 $    $Date: 1998/05/13 15:59:20 $ 

#if !defined __Scaler_H

#define __Scaler_H


#include <mix/Types.h>

/*************************************************************
 * Scale as a mathematic object for mapping float values into
 * pixels.
 *************************************************************/

class Scaler
{
protected:

  float Vleft, Vright;
  int   vSize;
  int   vOffset;

public:

  Scaler ();
  Scaler (float v_left, float v_right);

  int   get_coord (float value) const;
  float get_value (int coord) const;

  Logic is_inside (float value) const;

  float get_left () const;  // value V1
  float get_right () const; // value V2
  int   get_size () const;
  int   get_offset () const;
  int   get_left_coord () const;
  int   get_right_coord () const;

  float vpp () const;   // value per pixel of size

  virtual void  set_size (int size);
  virtual void  set_offset (int offset);
  virtual void  set_range (float v_left, float v_right);

  /* Zoom-in and zoom-out convenient methods, that change
     Vleft and Vright but don't change vSize and vOffset.
     v1 and v2 will be ordered properly so:

     (Vleft <= v1 < v2 <= Vright) or (Vleft >= v1 > v2 >= Vright) */

  void  zoom_in (float v1, float v2);
  void  zoom_out (float v1, float v2);

};

#endif  // Scaler.H