ZtStairs.H

/* ZtStairs.H */
/* $Id: ZtStairs.H,v 1.6 2004/02/17 13:53:38 vlad Exp $ */
#ifndef __ZtStairs_H
#define __ZtStairs_H

#include <mix/DoubleAr.H>
#include <zm/ZtTablet.H>


/***********************************************************************
 * Object to draw editable stairs: one argument point -> one stair (two
 * points of function).  Allows to change asynchronously argument array.
 ***********************************************************************/
class ZtStairs: public ZtTablet
{
protected:

  Logic     detached;   /* TRUE if no data */
  Logic     editable;   /* allow to change function visually */
  ZDimension    arg_orient; /* zdHor means that argument axis is horiz. */
  DoubleAr  *arg;   /* N points */
  DoubleAr  *func;  /* N+1 points */
  XSegmentAr    lines;  /* temporal buffer for segments being drawn */
  XSegmentAr    borders;/* temporal buffer for segments on border of rect */

  /* Proceed one segment of a curve in rectangle (xr,xr+wr)-(yr,yr+hr). */
  void  add_segment (float x[2], float y[2],
             float xr, float yr, float wr, float hr);

public:

  /* Special graphics context for line drawing */
  ZGEnv     line;

  /* Constructor.  Argument zdVertical means nyid is arg and
     nxid is function; zdHorizontal means another orientation. */
  ZtStairs (ZtMain* pManager,
        ZGroupId pxid, ZGroupId pyid,
        ZGroupId nxid, ZGroupId nyid,
        ZDimension argument);

  /* rArg and rFunc are changed inside object */
  void  attach_data (DoubleAr& rArg, DoubleAr& rFunc);
  void  detach_data ();

  /* Direct draw procedure: if size, place or parameters are changed */
  virtual void  redraw ();

  /* Find internal index of stair by (nx,ny) pair */
  unsigned  index (float nx, float ny);

  /* Callback for end of selection */
  virtual void  point (float nx, float ny);

  /* Get stair argument range and stair value */
  void      stair (float nx, float ny,
               double fArg[2], double& fFunc);

  /* Insert point */
  virtual void  insert (unsigned index, double fArg, double fFunc);

  /* Remove point */
  virtual void  remove (unsigned index);
  
  /* Number of stairs */
  int       n_of_stairs () const;

  /* Get stair value */
  double    stair_value (int i) const;

  /* Set stair value */
  void      set_value (int i, double d);

  virtual const char*   class_id () const;

};


#endif /* ZtStairs.H */