gimp/app/paint/gimppaintcore-stroke.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program is free software; you can 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include <glib-object.h>

#include "paint-types.h"

#include "core/gimpdrawable.h"

#include "vectors/gimpstroke.h"
#include "vectors/gimpvectors.h"

#include "gimppaintcore.h"
#include "gimppaintcore-stroke.h"
#include "gimppaintoptions.h"


gboolean
gimp_paint_core_stroke (GimpPaintCore    *core,
                        GimpDrawable     *drawable,
                        GimpPaintOptions *paint_options,
                        GimpCoords       *strokes,
                        gint              n_strokes)
{
  g_return_val_if_fail (GIMP_IS_PAINT_CORE (core), FALSE);
  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
  g_return_val_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options), FALSE);
  g_return_val_if_fail (strokes != NULL, FALSE);
  g_return_val_if_fail (n_strokes > 0, FALSE);

  if (gimp_paint_core_start (core, drawable, paint_options, &strokes[0]))
    {
      gint i;

      core->start_coords = strokes[0];
      core->last_coords  = strokes[0];

      gimp_paint_core_paint (core, drawable, paint_options, INIT_PAINT);

      gimp_paint_core_paint (core, drawable, paint_options, MOTION_PAINT);

      for (i = 1; i < n_strokes; i++)
        {
          core->cur_coords = strokes[i];

          gimp_paint_core_interpolate (core, drawable, paint_options);

          core->last_coords = core->cur_coords;
       }

      gimp_paint_core_paint (core, drawable, paint_options, FINISH_PAINT);

      gimp_paint_core_finish (core, drawable);

      gimp_paint_core_cleanup (core);

      return TRUE;
    }

  return FALSE;
}

gboolean
gimp_paint_core_stroke_vectors (GimpPaintCore    *core,
                                GimpDrawable     *drawable,
                                GimpPaintOptions *paint_options,
                                GimpVectors      *vectors)
{
  GimpStroke *stroke;
  GArray     *coords = NULL;
  gboolean    closed;

  g_return_val_if_fail (GIMP_IS_PAINT_CORE (core), FALSE);
  g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
  g_return_val_if_fail (GIMP_IS_PAINT_OPTIONS (paint_options), FALSE);
  g_return_val_if_fail (GIMP_IS_VECTORS (vectors), FALSE);

  /*  gimp_stroke_interpolate() may return NULL, so iterate over the
   *  list of strokes until one returns coords
   */
  for (stroke = vectors->strokes; stroke; stroke = stroke->next)
    {
      coords = gimp_stroke_interpolate (stroke, 1.0, &closed);

      if (coords)
        break;
    }

  if (! coords)
    return FALSE;

  if (! gimp_paint_core_start (core, drawable, paint_options,
                               &(g_array_index (coords, GimpCoords, 0))))
    {
      g_array_free (coords, TRUE);
      return FALSE;
    }

  gimp_paint_core_paint (core, drawable, paint_options, INIT_PAINT);

  do
    {
      gint i;

      core->start_coords = g_array_index (coords, GimpCoords, 0);
      core->last_coords  = g_array_index (coords, GimpCoords, 0);

      gimp_paint_core_paint (core, drawable, paint_options, MOTION_PAINT);

      for (i = 1; i < coords->len; i++)
        {
          core->cur_coords = g_array_index (coords, GimpCoords, i);

          gimp_paint_core_interpolate (core, drawable, paint_options);

          core->last_coords = core->cur_coords;
       }

      if (closed)
        {
          core->cur_coords = g_array_index (coords, GimpCoords, 0);

          gimp_paint_core_interpolate (core, drawable, paint_options);

          core->last_coords = core->cur_coords;
        }

      g_array_free (coords, TRUE);
      coords = NULL;

      if (stroke->next)
        {
          stroke = stroke->next;

          /*  see above  */
          for ( ; stroke; stroke = stroke->next)
            {
              coords = gimp_stroke_interpolate (stroke, 1.0, &closed);

              if (coords)
                break;
            }
        }
    }
  while (coords);

  gimp_paint_core_paint (core, drawable, paint_options, FINISH_PAINT);

  gimp_paint_core_finish (core, drawable);

  gimp_paint_core_cleanup (core);

  return TRUE;
}