/*
* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
* All rights reserved.
*
* This file is part of the Gnome Library.
*
* The Gnome Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* The Gnome Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the Gnome Library; see the file COPYING.LIB. If not,
* write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
@NOTATION@
*/
/* Rectangle and ellipse item types for GnomeCanvas widget
*
* GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is
* copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
*
*
* Authors: Federico Mena <federico@nuclecu.unam.mx>
* Rusty Conover <rconover@bangtail.net>
*/
#include <config.h>
#include <math.h>
#include "gnome-canvas-rect-ellipse.h"
#include "gnome-canvas-util.h"
#include "gnome-canvas-shape.h"
#include <libart_lgpl/art_vpath.h>
#include <libart_lgpl/art_svp.h>
#include <libart_lgpl/art_svp_vpath.h>
#include <libart_lgpl/art_rgb_svp.h>
/* Base class for rectangle and ellipse item types */
#define noVERBOSE
enum {
PROP_0,
PROP_X1,
PROP_Y1,
PROP_X2,
PROP_Y2
};
static void gnome_canvas_re_class_init (GnomeCanvasREClass *class);
static void gnome_canvas_re_init (GnomeCanvasRE *re);
static void gnome_canvas_re_destroy (GtkObject *object);
static void gnome_canvas_re_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec);
static void gnome_canvas_re_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec);
static void gnome_canvas_rect_update (GnomeCanvasItem *item, gdouble *affine, ArtSVP *clip_path, gint flags);
static void gnome_canvas_ellipse_update (GnomeCanvasItem *item, gdouble *affine, ArtSVP *clip_path, gint flags);
static GnomeCanvasItemClass *re_parent_class;
GType
gnome_canvas_re_get_type (void)
{
static GType re_type;
if (!re_type) {
const GTypeInfo object_info = {
sizeof (GnomeCanvasREClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gnome_canvas_re_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GnomeCanvasRE),
0, /* n_preallocs */
(GInstanceInitFunc) gnome_canvas_re_init,
NULL /* value_table */
};
re_type = g_type_register_static (GNOME_TYPE_CANVAS_SHAPE, "GnomeCanvasRE",
&object_info, 0);
}
return re_type;
}
static void
gnome_canvas_re_class_init (GnomeCanvasREClass *class)
{
GObjectClass *gobject_class;
GtkObjectClass *object_class;
gobject_class = (GObjectClass *) class;
object_class = (GtkObjectClass *) class;
re_parent_class = g_type_class_peek_parent (class);
gobject_class->set_property = gnome_canvas_re_set_property;
gobject_class->get_property = gnome_canvas_re_get_property;
g_object_class_install_property
(gobject_class,
PROP_X1,
g_param_spec_double ("x1", NULL, NULL,
-G_MAXDOUBLE, G_MAXDOUBLE, 0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property
(gobject_class,
PROP_Y1,
g_param_spec_double ("y1", NULL, NULL,
-G_MAXDOUBLE, G_MAXDOUBLE, 0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property
(gobject_class,
PROP_X2,
g_param_spec_double ("x2", NULL, NULL,
-G_MAXDOUBLE, G_MAXDOUBLE, 0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property
(gobject_class,
PROP_Y2,
g_param_spec_double ("y2", NULL, NULL,
-G_MAXDOUBLE, G_MAXDOUBLE, 0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
object_class->destroy = gnome_canvas_re_destroy;
}
static void
gnome_canvas_re_init (GnomeCanvasRE *re)
{
re->x1 = 0.0;
re->y1 = 0.0;
re->x2 = 0.0;
re->y2 = 0.0;
re->path_dirty = 0;
}
static void
gnome_canvas_re_destroy (GtkObject *object)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_RE (object));
if (GTK_OBJECT_CLASS (re_parent_class)->destroy)
(* GTK_OBJECT_CLASS (re_parent_class)->destroy) (object);
}
static void
gnome_canvas_re_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec)
{
GnomeCanvasItem *item;
GnomeCanvasRE *re;
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_RE (object));
item = GNOME_CANVAS_ITEM (object);
re = GNOME_CANVAS_RE (object);
switch (param_id) {
case PROP_X1:
re->x1 = g_value_get_double (value);
re->path_dirty = 1;
gnome_canvas_item_request_update (item);
break;
case PROP_Y1:
re->y1 = g_value_get_double (value);
re->path_dirty = 1;
gnome_canvas_item_request_update (item);
break;
case PROP_X2:
re->x2 = g_value_get_double (value);
re->path_dirty = 1;
gnome_canvas_item_request_update (item);
break;
case PROP_Y2:
re->y2 = g_value_get_double (value);
re->path_dirty = 1;
gnome_canvas_item_request_update (item);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
gnome_canvas_re_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec)
{
GnomeCanvasRE *re;
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_RE (object));
re = GNOME_CANVAS_RE (object);
switch (param_id) {
case PROP_X1:
g_value_set_double (value, re->x1);
break;
case PROP_Y1:
g_value_set_double (value, re->y1);
break;
case PROP_X2:
g_value_set_double (value, re->x2);
break;
case PROP_Y2:
g_value_set_double (value, re->y2);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
/* Rectangle item */
static void gnome_canvas_rect_class_init (GnomeCanvasRectClass *class);
GType
gnome_canvas_rect_get_type (void)
{
static GType rect_type;
if (!rect_type) {
const GTypeInfo object_info = {
sizeof (GnomeCanvasRectClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gnome_canvas_rect_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GnomeCanvasRect),
0, /* n_preallocs */
(GInstanceInitFunc) NULL,
NULL /* value_table */
};
rect_type = g_type_register_static (GNOME_TYPE_CANVAS_RE, "GnomeCanvasRect",
&object_info, 0);
}
return rect_type;
}
static void
gnome_canvas_rect_class_init (GnomeCanvasRectClass *class)
{
GnomeCanvasItemClass *item_class;
item_class = (GnomeCanvasItemClass *) class;
item_class->update = gnome_canvas_rect_update;
}
static void
gnome_canvas_rect_update (GnomeCanvasItem *item, gdouble affine[6], ArtSVP *clip_path, gint flags)
{ GnomeCanvasRE *re;
GnomeCanvasPathDef *path_def;
re = GNOME_CANVAS_RE(item);
if (re->path_dirty) {
path_def = gnome_canvas_path_def_new ();
gnome_canvas_path_def_moveto(path_def, re->x1, re->y1);
gnome_canvas_path_def_lineto(path_def, re->x2, re->y1);
gnome_canvas_path_def_lineto(path_def, re->x2, re->y2);
gnome_canvas_path_def_lineto(path_def, re->x1, re->y2);
gnome_canvas_path_def_lineto(path_def, re->x1, re->y1);
gnome_canvas_path_def_closepath_current(path_def);
gnome_canvas_shape_set_path_def (GNOME_CANVAS_SHAPE (item), path_def);
gnome_canvas_path_def_unref(path_def);
re->path_dirty = 0;
}
if (re_parent_class->update)
(* re_parent_class->update) (item, affine, clip_path, flags);
}
/* Ellipse item */
static void gnome_canvas_ellipse_class_init (GnomeCanvasEllipseClass *class);
GType
gnome_canvas_ellipse_get_type (void)
{
static GType ellipse_type;
if (!ellipse_type) {
const GTypeInfo object_info = {
sizeof (GnomeCanvasEllipseClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gnome_canvas_ellipse_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GnomeCanvasEllipse),
0, /* n_preallocs */
(GInstanceInitFunc) NULL,
NULL /* value_table */
};
ellipse_type = g_type_register_static (GNOME_TYPE_CANVAS_RE, "GnomeCanvasEllipse",
&object_info, 0);
}
return ellipse_type;
}
static void
gnome_canvas_ellipse_class_init (GnomeCanvasEllipseClass *class)
{
GnomeCanvasItemClass *item_class;
item_class = (GnomeCanvasItemClass *) class;
item_class->update = gnome_canvas_ellipse_update;
}
#define N_PTS 90
static void
gnome_canvas_ellipse_update (GnomeCanvasItem *item, gdouble affine[6], ArtSVP *clip_path, gint flags) {
GnomeCanvasPathDef *path_def;
GnomeCanvasRE *re;
re = GNOME_CANVAS_RE(item);
if (re->path_dirty) {
gdouble cx, cy, rx, ry;
gdouble beta = 0.26521648983954400922; /* 4*(1-cos(pi/8))/(3*sin(pi/8)) */
gdouble sincosA = 0.70710678118654752440; /* sin (pi/4), cos (pi/4) */
gdouble dx1, dy1, dx2, dy2;
gdouble mx, my;
path_def = gnome_canvas_path_def_new();
cx = (re->x2 + re->x1) * 0.5;
cy = (re->y2 + re->y1) * 0.5;
rx = re->x2 - cx;
ry = re->y2 - cy;
dx1 = beta * rx;
dy1 = beta * ry;
dx2 = beta * rx * sincosA;
dy2 = beta * ry * sincosA;
mx = rx * sincosA;
my = ry * sincosA;
gnome_canvas_path_def_moveto (path_def, cx + rx, cy);
gnome_canvas_path_def_curveto (path_def,
cx + rx, cy - dy1,
cx + mx + dx2, cy - my + dy2,
cx + mx, cy - my);
gnome_canvas_path_def_curveto (path_def,
cx + mx - dx2, cy - my - dy2,
cx + dx1, cy - ry,
cx, cy - ry);
gnome_canvas_path_def_curveto (path_def,
cx - dx1, cy - ry,
cx - mx + dx2, cy - my - dy2,
cx - mx, cy - my);
gnome_canvas_path_def_curveto (path_def,
cx - mx - dx2, cy - my + dy2,
cx - rx, cy - dy1,
cx - rx, cy);
gnome_canvas_path_def_curveto (path_def,
cx - rx, cy + dy1,
cx - mx - dx2, cy + my - dy2,
cx - mx, cy + my);
gnome_canvas_path_def_curveto (path_def,
cx - mx + dx2, cy + my + dy2,
cx - dx1, cy + ry,
cx, cy + ry);
gnome_canvas_path_def_curveto (path_def,
cx + dx1, cy + ry,
cx + mx - dx2, cy + my + dy2,
cx + mx, cy + my);
gnome_canvas_path_def_curveto (path_def,
cx + mx + dx2, cy + my - dy2,
cx + rx, cy + dy1,
cx + rx, cy);
gnome_canvas_path_def_closepath_current(path_def);
gnome_canvas_shape_set_path_def (GNOME_CANVAS_SHAPE (item), path_def);
gnome_canvas_path_def_unref(path_def);
re->path_dirty = 0;
}
if (re_parent_class->update)
(* re_parent_class->update) (item, affine, clip_path, flags);
}
