gimp/app/tools/ellipse_select.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 <stdlib.h>
#include "appenv.h"
#include "edit_selection.h"
#include "ellipse_select.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "rect_select.h"
/*  private header file for rect_select data structure  */
#include "rect_selectP.h"
#include "selection_options.h"

#include "libgimp/gimpintl.h"


/*  the ellipse selection tool options  */
SelectionOptions * ellipse_options = NULL;


/*************************************/
/*  Ellipsoidal selection apparatus  */

void
ellipse_select (GimpImage *gimage,
		int        x,
		int        y,
		int        w,
		int        h,
		int        op,
		int        antialias,
		int        feather,
		double     feather_radius)
{
  Channel * new_mask;

  /*  if applicable, replace the current selection  */
  if (op == REPLACE)
    gimage_mask_clear (gimage);
  else
    gimage_mask_undo (gimage);

  /*  if feathering for rect, make a new mask with the
   *  rectangle and feather that with the old mask
   */
  if (feather)
    {
      new_mask = channel_new_mask (gimage, gimage->width, gimage->height);
      channel_combine_ellipse (new_mask, ADD, x, y, w, h, antialias);
      channel_feather (new_mask, gimage_get_mask (gimage),
		       feather_radius, op, 0, 0);
      channel_delete (new_mask);
    }
  else if (op == INTERSECT)
    {
      new_mask = channel_new_mask (gimage, gimage->width, gimage->height);
      channel_combine_ellipse (new_mask, ADD, x, y, w, h, antialias);
      channel_combine_mask (gimage_get_mask (gimage), new_mask, op, 0, 0);
      channel_delete (new_mask);
    }
  else
    channel_combine_ellipse (gimage_get_mask (gimage), op, x, y, w, h, antialias);
}

void
ellipse_select_draw (Tool *tool)
{
  GDisplay * gdisp;
  EllipseSelect * ellipse_sel;
  int x1, y1, x2, y2;

  gdisp = (GDisplay *) tool->gdisp_ptr;
  ellipse_sel = (EllipseSelect *) tool->private;

  x1 = MINIMUM (ellipse_sel->x, ellipse_sel->x + ellipse_sel->w);
  y1 = MINIMUM (ellipse_sel->y, ellipse_sel->y + ellipse_sel->h);
  x2 = MAXIMUM (ellipse_sel->x, ellipse_sel->x + ellipse_sel->w);
  y2 = MAXIMUM (ellipse_sel->y, ellipse_sel->y + ellipse_sel->h);

  gdisplay_transform_coords (gdisp, x1, y1, &x1, &y1, 0);
  gdisplay_transform_coords (gdisp, x2, y2, &x2, &y2, 0);

  gdk_draw_arc (ellipse_sel->core->win,
		ellipse_sel->core->gc, 0,
		x1, y1, (x2 - x1), (y2 - y1), 0, 23040);
}

static void
ellipse_select_options_reset (void)
{
  selection_options_reset (ellipse_options);
}

Tool *
tools_new_ellipse_select (void)
{
  Tool *tool;
  EllipseSelect *private;

  /*  The tool options  */
  if (!ellipse_options)
    {
      ellipse_options =
	selection_options_new (ELLIPSE_SELECT, ellipse_select_options_reset);
      tools_register (ELLIPSE_SELECT, (ToolOptions *) ellipse_options);
    }

  tool = (Tool *) g_malloc (sizeof (Tool));
  private = (EllipseSelect *) g_malloc (sizeof (EllipseSelect));

  private->core = draw_core_new (ellipse_select_draw);
  /*  Make the selection static, not blinking  */
  private->x = private->y = 0;
  private->w = private->h = 0;

  tool->type = ELLIPSE_SELECT;
  tool->state = INACTIVE;
  tool->scroll_lock = 0;  /*  Allow scrolling  */
  tool->auto_snap_to = TRUE;
  tool->private = (void *) private;

  tool->button_press_func = rect_select_button_press;
  tool->button_release_func = rect_select_button_release;
  tool->motion_func = rect_select_motion;
  tool->arrow_keys_func = standard_arrow_keys_func;  tool->modifier_key_func = standard_modifier_key_func;
  tool->cursor_update_func = rect_select_cursor_update;
  tool->control_func = rect_select_control;
  tool->preserve = TRUE;

  return tool;
}

void
tools_free_ellipse_select (Tool *tool)
{
  EllipseSelect *ellipse_sel;

  ellipse_sel = (EllipseSelect *) tool->private;

  draw_core_free (ellipse_sel->core);
  g_free (ellipse_sel);
}