ZtCurve.H

/* ZtCurve.H */
/* $Id: ZtCurve.H,v 1.12 2004/02/17 13:53:36 vlad Exp $ */
#ifndef __ZtCurve_H
#define __ZtCurve_H

#include <mix/FloatAr.H>
#include <ldb/dbtools.h>
#include <zm/ZtObject.H>
#include <zm/ZtPointMark.H>


/*************************************************************
 * Object for curve drawing in linear or stairs interpolation.
 *************************************************************/
class ZtCurve : public ZtObject
{
protected:

  Logic     detached;   /* flag of absence of data */
  ZDimension    arg_orient; /* zdVertical: x(y); zdHorizontal: y(x). */
  FloatAr   arg;    /* stored argument: main array */
  FloatAr   func;   /* stored function */
  int   interpolation;  /* 0< - no curve but nodes only;
                0 - stairs;
                1 - line interpolation;
               >1 - N/A */

  /* Next fields are actual just after redraw() until changes() will
     be made */
  XSegmentAr    lines;  /* temporal buffer for segments being drawn */
  XSegment  outer;  /* boundary rectangle for the whole curve */
  Logic     visible;/* TRUE in case of at least one point of curve
               is visible */

  /* 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:

  ZtPointMark   node;

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

  /* Attach data */
  void  attach_data (unsigned cnt, float* pArg, float* pFunc);
  void  attach_data (unsigned cnt, double* pArg, double* pFunc);
  void  attach_data (dbHandle dbh, const char* ArgColumn,
             const char* ValColumn);

  void  attach_func (float* pFunc);
  void  attach_func (double* pFunc);

  void  detach_data ();
  Logic get_status_of_data ();

  /* Colour control */
  void      set_curve_color (const char* szColorName)
    {
      set_foreground(szColorName);
      changes();
    }
  void      set_curve_color (ColorPixel cpixel)
    {
      set_foreground(cpixel);
      changes();
    }
  ColorPixel    get_curve_color () const
    {
      return get_foreground();
    }

  /* Line parameters control */
  void      set_interpolation (int base);
  int       get_interpolation () const;
  /* + set/get_line_width(), 0 by default */

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

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

  /* Remove point */
  virtual void  remove (unsigned index);

  /* Self-location: returns TRUE if point belongs to object and FALSE
     otherwise. */
  virtual Logic belong (int px, int py) const;

  virtual const char*   class_id () const;

};


#endif /* ZtCurve.H */