plotutils-graph-patches-lloda/libplot/m_path.c

/* This file is part of the GNU plotutils package.  Copyright (C) 1995,
   1996, 1997, 1998, 1999, 2000, 2005, 2008, Free Software Foundation, Inc.

   The GNU plotutils package is free software.  You may redistribute it
   and/or modify it under the terms of the GNU General Public License as
   published by the Free Software foundation; either version 2, or (at your
   option) any later version.

   The GNU plotutils package is distributed in the hope that it will be
   useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with the GNU plotutils package; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin St., Fifth Floor,
   Boston, MA 02110-1301, USA. */

/* This file contains the internal paint_path() and paint_paths() methods,
   which the public method endpath() is a wrapper around. */

#include "sys-defines.h"
#include "extern.h"

void
_pl_m_paint_path (S___(Plotter *_plotter))
{
  const plPath *path;
  bool explicit_endpath, sync_miter_limit = false;

  /* sync basic path attributes */
  _pl_m_set_attributes (R___(_plotter) 
		     PL_ATTR_TRANSFORMATION_MATRIX 
		     | PL_ATTR_PEN_COLOR  | PL_ATTR_PEN_TYPE
		     | PL_ATTR_LINE_STYLE | PL_ATTR_LINE_WIDTH
		     | PL_ATTR_JOIN_STYLE | PL_ATTR_CAP_STYLE
		     | PL_ATTR_FILL_COLOR | PL_ATTR_FILL_TYPE
		     | PL_ATTR_FILL_RULE);

  /* our one and only simple path to paint */
  path = _plotter->drawstate->path;

  if (_plotter->drawstate->join_type == PL_JOIN_MITER
      && (path->type == PATH_SEGMENT_LIST || path->type == PATH_BOX))
    /* path may have mitered juncture points */
    sync_miter_limit = true;
  if (sync_miter_limit)
    _pl_m_set_attributes (R___(_plotter) PL_ATTR_MITER_LIMIT);

  if (path->type == PATH_SEGMENT_LIST)
    explicit_endpath = true;
  else
    explicit_endpath = false;

  /* emit metafile object-drawing instructions to draw the path; include a
     preliminary syncing of the `orientation' attribute if relevant */
  _pl_m_paint_path_internal (R___(_plotter) path);

  if (explicit_endpath)
    {
      _pl_m_emit_op_code (R___(_plotter) O_ENDPATH);
      _pl_m_emit_terminator (S___(_plotter));
    }
}

bool
_pl_m_paint_paths (S___(Plotter *_plotter))
{
  const plPath *path;
  bool sync_miter_limit = false;
  int i;

  /* sanity check */
  if (_plotter->drawstate->num_paths == 0)
    return true;

  /* sync basic path attributes */
  _pl_m_set_attributes (R___(_plotter) 
		     PL_ATTR_TRANSFORMATION_MATRIX 
		     | PL_ATTR_PEN_COLOR  | PL_ATTR_PEN_TYPE
		     | PL_ATTR_LINE_STYLE | PL_ATTR_LINE_WIDTH
		     | PL_ATTR_JOIN_STYLE | PL_ATTR_CAP_STYLE
		     | PL_ATTR_FILL_COLOR | PL_ATTR_FILL_TYPE
		     | PL_ATTR_FILL_RULE);

  if (_plotter->drawstate->join_type == PL_JOIN_MITER)
    {
      for (i = 0; i < _plotter->drawstate->num_paths; i++)
	{
	  path = _plotter->drawstate->paths[i];
	  if (path->type == PATH_SEGMENT_LIST || path->type == PATH_BOX)
	    /* compound path may have mitered juncture points */
	    {
	      sync_miter_limit = true;
	      break;
	    }
	}
    }
  if (sync_miter_limit)
    _pl_m_set_attributes (R___(_plotter) PL_ATTR_MITER_LIMIT);
  
  /* loop over simple paths in compound path */
  for (i = 0; i < _plotter->drawstate->num_paths; i++)
    {
      path = _plotter->drawstate->paths[i];

      /* emit metafile object-drawing instructions to draw the path; first
	 sync `orientation' attribute, if relevant */
      _pl_m_paint_path_internal (R___(_plotter) path);

      if (i < _plotter->drawstate->num_paths - 1)
	{
	  _pl_m_emit_op_code (R___(_plotter) O_ENDSUBPATH);
	  _pl_m_emit_terminator (S___(_plotter));
	}
    }

  if (_plotter->drawstate->paths[_plotter->drawstate->num_paths - 1]->type == PATH_SEGMENT_LIST)
    /* append explicit (as opposed to implicit) endpath; if we didn't wish
       to be clever, we'd append one even if the final simple path isn't a
       segment list */
    {
      _pl_m_emit_op_code (R___(_plotter) O_ENDPATH);
      _pl_m_emit_terminator (S___(_plotter));
    }

  /* succesfully painted compound path */
  return true;
}

/* Internal routine, called by the MetaPlotter-specific versions of
   paint_path() and paint_paths().  Besides emitting metafile instructions
   to draw a path, it may emit an instruction to update the `orientation'
   attribute, relevant to paths that are boxes/circles/ellipses. */

void
_pl_m_paint_path_internal (R___(Plotter *_plotter) const plPath *path)
{
  if (path->type == PATH_BOX 
      || path->type == PATH_CIRCLE || path->type == PATH_ELLIPSE)
    /* sync orientation; orientation is stored in the path itself, not in
       the drawing state */
    {
      int orientation = (path->clockwise ? -1 : 1);

      if (_plotter->meta_orientation != orientation)
	{
	  _pl_m_emit_op_code (R___(_plotter) O_ORIENTATION);
	  _pl_m_emit_integer (R___(_plotter) orientation);
	  _pl_m_emit_terminator (S___(_plotter));
	  _plotter->meta_orientation = orientation;
	}
    }

  switch ((int)path->type)
    {
    case (int)PATH_SEGMENT_LIST:
      {
	plPathSegment segment;
	int i;

	/* last-minute sanity check */
	if (path->num_segments == 0)/* nothing to do */
	  break;
	if (path->num_segments == 1) /* shouldn't happen */
	  break;

	segment = path->segments[0]; /* initial moveto */
	if (_plotter->meta_pos.x != segment.p.x
	    || _plotter->meta_pos.y != segment.p.y)
	  {
	    _pl_m_emit_op_code (R___(_plotter) O_FMOVE);
	    _pl_m_emit_float (R___(_plotter) segment.p.x);
	    _pl_m_emit_float (R___(_plotter) segment.p.y);
	    _pl_m_emit_terminator (S___(_plotter));
	    _plotter->meta_pos = segment.p;
	  }

	for (i = 1; i < path->num_segments; i++)
	  {
	    plPathSegment prev_segment;

	    prev_segment = segment;
	    segment = path->segments[i];
	    switch ((int)segment.type)
	      {
	      case (int)S_LINE:
		_pl_m_emit_op_code (R___(_plotter) O_FCONT);
		_pl_m_emit_float (R___(_plotter) segment.p.x);
		_pl_m_emit_float (R___(_plotter) segment.p.y);
		_pl_m_emit_terminator (S___(_plotter));
		_plotter->meta_pos = segment.p;
		break;
		
	      case (int)S_ARC:
		_pl_m_emit_op_code (R___(_plotter) O_FARC);
		_pl_m_emit_float (R___(_plotter) segment.pc.x);
		_pl_m_emit_float (R___(_plotter) segment.pc.y);
		_pl_m_emit_float (R___(_plotter) prev_segment.p.x);
		_pl_m_emit_float (R___(_plotter) prev_segment.p.y);
		_pl_m_emit_float (R___(_plotter) segment.p.x);
		_pl_m_emit_float (R___(_plotter) segment.p.y);
		_pl_m_emit_terminator (S___(_plotter));
		_plotter->meta_pos = segment.p;
		break;
		
	      case (int)S_ELLARC:
		_pl_m_emit_op_code (R___(_plotter) O_FELLARC);
		_pl_m_emit_float (R___(_plotter) segment.pc.x);
		_pl_m_emit_float (R___(_plotter) segment.pc.y);
		_pl_m_emit_float (R___(_plotter) prev_segment.p.x);
		_pl_m_emit_float (R___(_plotter) prev_segment.p.y);
		_pl_m_emit_float (R___(_plotter) segment.p.x);
		_pl_m_emit_float (R___(_plotter) segment.p.y);
		_pl_m_emit_terminator (S___(_plotter));
		_plotter->meta_pos = segment.p;
		break;
		
	      case (int)S_QUAD:
		_pl_m_emit_op_code (R___(_plotter) O_FBEZIER2);
		_pl_m_emit_float (R___(_plotter) prev_segment.p.x);
		_pl_m_emit_float (R___(_plotter) prev_segment.p.y);
		_pl_m_emit_float (R___(_plotter) segment.pc.x);
		_pl_m_emit_float (R___(_plotter) segment.pc.y);
		_pl_m_emit_float (R___(_plotter) segment.p.x);
		_pl_m_emit_float (R___(_plotter) segment.p.y);
		_pl_m_emit_terminator (S___(_plotter));
		_plotter->meta_pos = segment.p;
		break;
		
	      case (int)S_CUBIC:
		_pl_m_emit_op_code (R___(_plotter) O_FBEZIER3);
		_pl_m_emit_float (R___(_plotter) prev_segment.p.x);
		_pl_m_emit_float (R___(_plotter) prev_segment.p.y);
		_pl_m_emit_float (R___(_plotter) segment.pc.x);
		_pl_m_emit_float (R___(_plotter) segment.pc.y);
		_pl_m_emit_float (R___(_plotter) segment.pd.x);
		_pl_m_emit_float (R___(_plotter) segment.pd.y);
		_pl_m_emit_float (R___(_plotter) segment.p.x);
		_pl_m_emit_float (R___(_plotter) segment.p.y);
		_pl_m_emit_terminator (S___(_plotter));
		_plotter->meta_pos = segment.p;
		break;
		
	      default:		/* shouldn't happen */
		break;
	      }
	  }
      }
      break;
      
    case (int)PATH_BOX:
      {
	_pl_m_emit_op_code (R___(_plotter) O_FBOX);
	_pl_m_emit_float (R___(_plotter) path->p0.x);
	_pl_m_emit_float (R___(_plotter) path->p0.y);
	_pl_m_emit_float (R___(_plotter) path->p1.x);
	_pl_m_emit_float (R___(_plotter) path->p1.y);
	_pl_m_emit_terminator (S___(_plotter));
	
	_plotter->meta_pos.x = 0.5 * (path->p0.x + path->p1.x);
	_plotter->meta_pos.y = 0.5 * (path->p0.y + path->p1.y);
      }
      break;
      
    case (int)PATH_CIRCLE:
      {
	_pl_m_emit_op_code (R___(_plotter) O_FCIRCLE);
	_pl_m_emit_float (R___(_plotter) path->pc.x);
	_pl_m_emit_float (R___(_plotter) path->pc.y);
	_pl_m_emit_float (R___(_plotter) path->radius);
	_pl_m_emit_terminator (S___(_plotter));
	
	_plotter->meta_pos = path->pc;
      }
      break;
      
    case (int)PATH_ELLIPSE:
      {
	_pl_m_emit_op_code (R___(_plotter) O_FELLIPSE);
	_pl_m_emit_float (R___(_plotter) path->pc.x);
	_pl_m_emit_float (R___(_plotter) path->pc.y);
	_pl_m_emit_float (R___(_plotter) path->rx);
	_pl_m_emit_float (R___(_plotter) path->ry);
	_pl_m_emit_float (R___(_plotter) path->angle);
	_pl_m_emit_terminator (S___(_plotter));
	
	_plotter->meta_pos = path->pc;
      }
      break;

    default:			/* shouldn't happen */
      break;
    }
}

bool
_pl_m_path_is_flushable (S___(Plotter *_plotter))
{
  return true;
}

void
_pl_m_maybe_prepaint_segments (R___(Plotter *_plotter) int prev_num_segments)
{
  return;
}