ZBarDraw.H

// ZBarDraw.H   $Revision: 1.7 $    (C) VSP,CGE:26  $Date: 2003/01/31 17:11:47 $ 

#if !defined __ZBarDraw_H

#define __ZBarDraw_H

#include <zm/ZBase.H>
#include <zm/ZPalette.H>


#define AUTO_FLUSH  5000
#define BUFFER_GROW 500

/*************************************************************
 * Draw color bars (sticks) with simple color bufferization.
 * Auto-flushing is set to AUTO_FLUSH segments at start.
 *************************************************************/

class ZBarDraw : public ZDrawable
{
protected:

  ZRect     clip;       /* clip rectangle area */

  Logic     flip_flag;  /* FALSE - vertical bars;
                   TRUE - horizontal bars */
  ZPalette  *pal;       /* If NULL - all color indexes gives black */

  XSegmentAr    buf;        /* stores XSegments until flush_bars()
                 * or new bar to draw with different than
                 * previous color */
  unsigned  cindex;     /* color index of bars in buf */
  ColorPixel    cpixel;     /* exact color pixel */
  enum {
    NO_COLOR,
    COLOR_PALETTE,
    EXACT_COLOR
  }     color_mode; /* mode of color definition */
  unsigned  auto_flush; /* limits XSegment stacking in buf */

  XImage    *image;     /* NULL -- image is off */

  /* set foreground color to one with cindex */
  void      set_bars_color ();

public:

  ZBarDraw (const ZConnect& zconnect, Drawable drawable);
  ZBarDraw (const ZDrawable& zdrawable);

  /* interpret position as x-coord (vertical bars -- flip FALSE)
     or as y-coord (horizontal bars -- flip TRUE) */
  virtual void  flip (Logic new_flag);

  /* return value of flip_flag */
  Logic     is_flipped () const
    {return flip_flag;}

  /* set auto-flush threshold */
  void      set_autoflush (unsigned new_volume)
    {auto_flush = new_volume;}

  /* set rectangle of clip drawings */
  virtual void  set_cliprect (ZRect& r);

  /* clip pointed bar to segment and flip it if needed */
  Logic     clip_and_flip (XSegment& dest, int pos,
                   int start, int end);

  /* attach palette of colors */
  virtual void  attach_palette (ZPalette* theColorPalette);

  /* draw one bar in pointed position from start to end
     with color index in attached palette (Not ColorPixel!!!) */
  virtual void  draw_bar (int pos, int start, int end,
              unsigned color);

  /* draw one bar in pointed position from start to end
     with undefined color index -- will be known after set_color() */
  virtual void  draw_bar (int pos, int start, int end);

  /* assign color index to all previously "drawn" bars */
  virtual void  set_color (unsigned color);

  /* draw one bar in pointed position from start to end
     with exact ColorPixel as a color */
  virtual void  draw_bar_cp (int pos, int start, int end,
                 ColorPixel cp);

  /* send all segment buffers to X-server */
  virtual void  flush_bars ();

  /* turn on XImage buffer (drawable -> image) */
  virtual void  image_on ();

  /* turn off XImage buffer (image -> drawable) */
  virtual void  image_off ();

};


#endif  // ZBarDraw.H