[18322] | 1 | /* |
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| 2 | * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * This file is part of the Gnome Library. |
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| 6 | * |
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| 7 | * The Gnome Library is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Library General Public License as |
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| 9 | * published by the Free Software Foundation; either version 2 of the |
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| 10 | * License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * The Gnome Library is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Library General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Library General Public |
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| 18 | * License along with the Gnome Library; see the file COPYING.LIB. If not, |
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| 19 | * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 20 | * Boston, MA 02111-1307, USA. |
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| 21 | */ |
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| 22 | /* |
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| 23 | @NOTATION@ |
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| 24 | */ |
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| 25 | /* Rectangle and ellipse item types for GnomeCanvas widget |
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| 26 | * |
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| 27 | * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is |
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| 28 | * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties. |
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| 29 | * |
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| 30 | * |
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| 31 | * Authors: Federico Mena <federico@nuclecu.unam.mx> |
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| 32 | * Rusty Conover <rconover@bangtail.net> |
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| 33 | */ |
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| 34 | |
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| 35 | #include <config.h> |
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| 36 | #include <math.h> |
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| 37 | #include "gnome-canvas-rect-ellipse.h" |
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| 38 | #include "gnome-canvas-util.h" |
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| 39 | #include "gnome-canvas-shape.h" |
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| 40 | |
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| 41 | |
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| 42 | #include "libart_lgpl/art_vpath.h" |
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| 43 | #include "libart_lgpl/art_svp.h" |
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| 44 | #include "libart_lgpl/art_svp_vpath.h" |
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| 45 | #include "libart_lgpl/art_rgb_svp.h" |
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| 46 | |
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| 47 | /* Base class for rectangle and ellipse item types */ |
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| 48 | |
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| 49 | #define noVERBOSE |
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| 50 | |
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| 51 | enum { |
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| 52 | PROP_0, |
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| 53 | PROP_X1, |
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| 54 | PROP_Y1, |
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| 55 | PROP_X2, |
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[20820] | 56 | PROP_Y2 |
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[18322] | 57 | }; |
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| 58 | |
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| 59 | |
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| 60 | static void gnome_canvas_re_class_init (GnomeCanvasREClass *class); |
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| 61 | static void gnome_canvas_re_init (GnomeCanvasRE *re); |
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| 62 | static void gnome_canvas_re_destroy (GtkObject *object); |
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| 63 | static void gnome_canvas_re_set_property (GObject *object, |
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| 64 | guint param_id, |
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| 65 | const GValue *value, |
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| 66 | GParamSpec *pspec); |
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| 67 | static void gnome_canvas_re_get_property (GObject *object, |
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| 68 | guint param_id, |
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| 69 | GValue *value, |
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| 70 | GParamSpec *pspec); |
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| 71 | |
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| 72 | static void gnome_canvas_rect_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags); |
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| 73 | static void gnome_canvas_ellipse_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags); |
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| 74 | |
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| 75 | static GnomeCanvasItemClass *re_parent_class; |
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| 76 | |
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| 77 | |
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| 78 | GType |
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| 79 | gnome_canvas_re_get_type (void) |
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| 80 | { |
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| 81 | static GType re_type; |
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| 82 | |
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| 83 | if (!re_type) { |
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| 84 | static const GTypeInfo object_info = { |
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| 85 | sizeof (GnomeCanvasREClass), |
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| 86 | (GBaseInitFunc) NULL, |
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| 87 | (GBaseFinalizeFunc) NULL, |
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| 88 | (GClassInitFunc) gnome_canvas_re_class_init, |
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| 89 | (GClassFinalizeFunc) NULL, |
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| 90 | NULL, /* class_data */ |
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| 91 | sizeof (GnomeCanvasRE), |
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| 92 | 0, /* n_preallocs */ |
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| 93 | (GInstanceInitFunc) gnome_canvas_re_init, |
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| 94 | NULL /* value_table */ |
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| 95 | }; |
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| 96 | |
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| 97 | re_type = g_type_register_static (GNOME_TYPE_CANVAS_SHAPE, "GnomeCanvasRE", |
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| 98 | &object_info, 0); |
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| 99 | } |
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| 100 | |
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| 101 | return re_type; |
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| 102 | } |
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| 103 | |
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| 104 | static void |
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| 105 | gnome_canvas_re_class_init (GnomeCanvasREClass *class) |
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| 106 | { |
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| 107 | GObjectClass *gobject_class; |
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| 108 | GtkObjectClass *object_class; |
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| 109 | GnomeCanvasItemClass *item_class; |
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| 110 | |
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| 111 | gobject_class = (GObjectClass *) class; |
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| 112 | object_class = (GtkObjectClass *) class; |
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| 113 | item_class = (GnomeCanvasItemClass *) class; |
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| 114 | |
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| 115 | re_parent_class = g_type_class_peek_parent (class); |
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| 116 | |
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| 117 | gobject_class->set_property = gnome_canvas_re_set_property; |
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| 118 | gobject_class->get_property = gnome_canvas_re_get_property; |
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| 119 | |
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| 120 | g_object_class_install_property |
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| 121 | (gobject_class, |
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| 122 | PROP_X1, |
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| 123 | g_param_spec_double ("x1", NULL, NULL, |
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| 124 | -G_MAXDOUBLE, G_MAXDOUBLE, 0, |
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| 125 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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| 126 | g_object_class_install_property |
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| 127 | (gobject_class, |
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| 128 | PROP_Y1, |
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| 129 | g_param_spec_double ("y1", NULL, NULL, |
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| 130 | -G_MAXDOUBLE, G_MAXDOUBLE, 0, |
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| 131 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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| 132 | g_object_class_install_property |
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| 133 | (gobject_class, |
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| 134 | PROP_X2, |
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| 135 | g_param_spec_double ("x2", NULL, NULL, |
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| 136 | -G_MAXDOUBLE, G_MAXDOUBLE, 0, |
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| 137 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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| 138 | g_object_class_install_property |
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| 139 | (gobject_class, |
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| 140 | PROP_Y2, |
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| 141 | g_param_spec_double ("y2", NULL, NULL, |
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| 142 | -G_MAXDOUBLE, G_MAXDOUBLE, 0, |
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| 143 | (G_PARAM_READABLE | G_PARAM_WRITABLE))); |
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| 144 | |
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| 145 | object_class->destroy = gnome_canvas_re_destroy; |
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| 146 | } |
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| 147 | |
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| 148 | static void |
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| 149 | gnome_canvas_re_init (GnomeCanvasRE *re) |
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| 150 | { |
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| 151 | re->x1 = 0.0; |
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| 152 | re->y1 = 0.0; |
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| 153 | re->x2 = 0.0; |
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| 154 | re->y2 = 0.0; |
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| 155 | re->path_dirty = 0; |
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| 156 | } |
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| 157 | |
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| 158 | static void |
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| 159 | gnome_canvas_re_destroy (GtkObject *object) |
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| 160 | { |
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| 161 | GnomeCanvasRE *re; |
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| 162 | |
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| 163 | g_return_if_fail (object != NULL); |
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| 164 | g_return_if_fail (GNOME_IS_CANVAS_RE (object)); |
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| 165 | |
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| 166 | re = GNOME_CANVAS_RE (object); |
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| 167 | |
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| 168 | if (GTK_OBJECT_CLASS (re_parent_class)->destroy) |
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| 169 | (* GTK_OBJECT_CLASS (re_parent_class)->destroy) (object); |
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| 170 | } |
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| 171 | |
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| 172 | static void |
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| 173 | gnome_canvas_re_set_property (GObject *object, |
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| 174 | guint param_id, |
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| 175 | const GValue *value, |
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| 176 | GParamSpec *pspec) |
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| 177 | { |
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| 178 | GnomeCanvasItem *item; |
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| 179 | GnomeCanvasRE *re; |
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| 180 | |
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| 181 | g_return_if_fail (object != NULL); |
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| 182 | g_return_if_fail (GNOME_IS_CANVAS_RE (object)); |
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| 183 | |
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| 184 | item = GNOME_CANVAS_ITEM (object); |
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| 185 | re = GNOME_CANVAS_RE (object); |
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| 186 | |
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| 187 | switch (param_id) { |
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| 188 | case PROP_X1: |
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| 189 | re->x1 = g_value_get_double (value); |
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| 190 | re->path_dirty = 1; |
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| 191 | gnome_canvas_item_request_update (item); |
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| 192 | break; |
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| 193 | |
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| 194 | case PROP_Y1: |
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| 195 | re->y1 = g_value_get_double (value); |
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| 196 | re->path_dirty = 1; |
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| 197 | gnome_canvas_item_request_update (item); |
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| 198 | break; |
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| 199 | |
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| 200 | case PROP_X2: |
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| 201 | re->x2 = g_value_get_double (value); |
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| 202 | re->path_dirty = 1; |
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| 203 | gnome_canvas_item_request_update (item); |
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| 204 | break; |
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| 205 | |
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| 206 | case PROP_Y2: |
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| 207 | re->y2 = g_value_get_double (value); |
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| 208 | re->path_dirty = 1; |
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| 209 | gnome_canvas_item_request_update (item); |
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| 210 | break; |
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| 211 | |
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| 212 | default: |
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| 213 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec); |
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| 214 | break; |
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| 215 | } |
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| 216 | } |
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| 217 | |
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| 218 | static void |
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| 219 | gnome_canvas_re_get_property (GObject *object, |
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| 220 | guint param_id, |
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| 221 | GValue *value, |
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| 222 | GParamSpec *pspec) |
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| 223 | { |
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| 224 | GnomeCanvasRE *re; |
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| 225 | |
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| 226 | g_return_if_fail (object != NULL); |
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| 227 | g_return_if_fail (GNOME_IS_CANVAS_RE (object)); |
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| 228 | |
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| 229 | re = GNOME_CANVAS_RE (object); |
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| 230 | |
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| 231 | switch (param_id) { |
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| 232 | case PROP_X1: |
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| 233 | g_value_set_double (value, re->x1); |
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| 234 | break; |
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| 235 | |
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| 236 | case PROP_Y1: |
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| 237 | g_value_set_double (value, re->y1); |
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| 238 | break; |
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| 239 | |
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| 240 | case PROP_X2: |
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| 241 | g_value_set_double (value, re->x2); |
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| 242 | break; |
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| 243 | |
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| 244 | case PROP_Y2: |
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| 245 | g_value_set_double (value, re->y2); |
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| 246 | break; |
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| 247 | |
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| 248 | default: |
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| 249 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec); |
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| 250 | break; |
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| 251 | } |
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| 252 | } |
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| 253 | |
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| 254 | /* Rectangle item */ |
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| 255 | static void gnome_canvas_rect_class_init (GnomeCanvasRectClass *class); |
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| 256 | |
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| 257 | |
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| 258 | |
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| 259 | GType |
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| 260 | gnome_canvas_rect_get_type (void) |
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| 261 | { |
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| 262 | static GType rect_type; |
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| 263 | |
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| 264 | if (!rect_type) { |
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| 265 | static const GTypeInfo object_info = { |
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| 266 | sizeof (GnomeCanvasRectClass), |
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| 267 | (GBaseInitFunc) NULL, |
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| 268 | (GBaseFinalizeFunc) NULL, |
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| 269 | (GClassInitFunc) gnome_canvas_rect_class_init, |
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| 270 | (GClassFinalizeFunc) NULL, |
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| 271 | NULL, /* class_data */ |
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| 272 | sizeof (GnomeCanvasRect), |
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| 273 | 0, /* n_preallocs */ |
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| 274 | (GInstanceInitFunc) NULL, |
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| 275 | NULL /* value_table */ |
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| 276 | }; |
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| 277 | |
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| 278 | rect_type = g_type_register_static (GNOME_TYPE_CANVAS_RE, "GnomeCanvasRect", |
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| 279 | &object_info, 0); |
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| 280 | } |
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| 281 | |
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| 282 | return rect_type; |
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| 283 | } |
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| 284 | |
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| 285 | static void |
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| 286 | gnome_canvas_rect_class_init (GnomeCanvasRectClass *class) |
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| 287 | { |
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| 288 | GnomeCanvasItemClass *item_class; |
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| 289 | |
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| 290 | item_class = (GnomeCanvasItemClass *) class; |
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| 291 | |
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| 292 | item_class->update = gnome_canvas_rect_update; |
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| 293 | } |
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| 294 | |
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| 295 | static void |
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| 296 | gnome_canvas_rect_update (GnomeCanvasItem *item, double affine[6], ArtSVP *clip_path, gint flags) |
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| 297 | { GnomeCanvasRE *re; |
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| 298 | |
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| 299 | GnomeCanvasPathDef *path_def; |
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| 300 | |
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| 301 | re = GNOME_CANVAS_RE(item); |
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| 302 | |
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| 303 | if (re->path_dirty) { |
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| 304 | path_def = gnome_canvas_path_def_new (); |
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| 305 | |
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| 306 | gnome_canvas_path_def_moveto(path_def, re->x1, re->y1); |
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| 307 | gnome_canvas_path_def_lineto(path_def, re->x2, re->y1); |
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| 308 | gnome_canvas_path_def_lineto(path_def, re->x2, re->y2); |
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| 309 | gnome_canvas_path_def_lineto(path_def, re->x1, re->y2); |
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| 310 | gnome_canvas_path_def_lineto(path_def, re->x1, re->y1); |
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| 311 | gnome_canvas_path_def_closepath_current(path_def); |
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| 312 | gnome_canvas_shape_set_path_def (GNOME_CANVAS_SHAPE (item), path_def); |
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| 313 | gnome_canvas_path_def_unref(path_def); |
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| 314 | re->path_dirty = 0; |
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| 315 | } |
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| 316 | |
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| 317 | if (re_parent_class->update) |
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| 318 | (* re_parent_class->update) (item, affine, clip_path, flags); |
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| 319 | } |
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| 320 | |
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| 321 | /* Ellipse item */ |
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| 322 | |
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| 323 | |
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| 324 | static void gnome_canvas_ellipse_class_init (GnomeCanvasEllipseClass *class); |
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| 325 | |
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| 326 | |
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| 327 | GType |
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| 328 | gnome_canvas_ellipse_get_type (void) |
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| 329 | { |
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| 330 | static GType ellipse_type; |
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| 331 | |
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| 332 | if (!ellipse_type) { |
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| 333 | static const GTypeInfo object_info = { |
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| 334 | sizeof (GnomeCanvasEllipseClass), |
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| 335 | (GBaseInitFunc) NULL, |
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| 336 | (GBaseFinalizeFunc) NULL, |
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| 337 | (GClassInitFunc) gnome_canvas_ellipse_class_init, |
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| 338 | (GClassFinalizeFunc) NULL, |
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| 339 | NULL, /* class_data */ |
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| 340 | sizeof (GnomeCanvasEllipse), |
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| 341 | 0, /* n_preallocs */ |
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| 342 | (GInstanceInitFunc) NULL, |
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| 343 | NULL /* value_table */ |
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| 344 | }; |
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| 345 | |
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| 346 | ellipse_type = g_type_register_static (GNOME_TYPE_CANVAS_RE, "GnomeCanvasEllipse", |
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| 347 | &object_info, 0); |
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| 348 | } |
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| 349 | |
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| 350 | return ellipse_type; |
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| 351 | } |
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| 352 | |
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| 353 | static void |
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| 354 | gnome_canvas_ellipse_class_init (GnomeCanvasEllipseClass *class) |
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| 355 | { |
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| 356 | GnomeCanvasItemClass *item_class; |
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| 357 | |
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| 358 | item_class = (GnomeCanvasItemClass *) class; |
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| 359 | |
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| 360 | item_class->update = gnome_canvas_ellipse_update; |
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| 361 | } |
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| 362 | |
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| 363 | #define N_PTS 90 |
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| 364 | |
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| 365 | static void |
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| 366 | gnome_canvas_ellipse_update (GnomeCanvasItem *item, double affine[6], ArtSVP *clip_path, gint flags) { |
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| 367 | GnomeCanvasPathDef *path_def; |
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| 368 | GnomeCanvasRE *re; |
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| 369 | |
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| 370 | re = GNOME_CANVAS_RE(item); |
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| 371 | |
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| 372 | if (re->path_dirty) { |
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| 373 | gdouble cx, cy, rx, ry; |
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| 374 | gdouble beta = 0.26521648983954400922; /* 4*(1-cos(pi/8))/(3*sin(pi/8)) */ |
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| 375 | gdouble sincosA = 0.70710678118654752440; /* sin (pi/4), cos (pi/4) */ |
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| 376 | gdouble dx1, dy1, dx2, dy2; |
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| 377 | gdouble mx, my; |
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| 378 | |
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| 379 | path_def = gnome_canvas_path_def_new(); |
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| 380 | |
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| 381 | cx = (re->x2 + re->x1) * 0.5; |
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| 382 | cy = (re->y2 + re->y1) * 0.5; |
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| 383 | rx = re->x2 - cx; |
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| 384 | ry = re->y2 - cy; |
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| 385 | |
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| 386 | dx1 = beta * rx; |
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| 387 | dy1 = beta * ry; |
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| 388 | dx2 = beta * rx * sincosA; |
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| 389 | dy2 = beta * ry * sincosA; |
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| 390 | mx = rx * sincosA; |
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| 391 | my = ry * sincosA; |
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| 392 | |
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| 393 | gnome_canvas_path_def_moveto (path_def, cx + rx, cy); |
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| 394 | gnome_canvas_path_def_curveto (path_def, |
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| 395 | cx + rx, cy - dy1, |
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| 396 | cx + mx + dx2, cy - my + dy2, |
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| 397 | cx + mx, cy - my); |
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| 398 | gnome_canvas_path_def_curveto (path_def, |
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| 399 | cx + mx - dx2, cy - my - dy2, |
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| 400 | cx + dx1, cy - ry, |
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| 401 | cx, cy - ry); |
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| 402 | gnome_canvas_path_def_curveto (path_def, |
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| 403 | cx - dx1, cy - ry, |
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| 404 | cx - mx + dx2, cy - my - dy2, |
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| 405 | cx - mx, cy - my); |
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| 406 | gnome_canvas_path_def_curveto (path_def, |
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| 407 | cx - mx - dx2, cy - my + dy2, |
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| 408 | cx - rx, cy - dy1, |
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| 409 | cx - rx, cy); |
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| 410 | |
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| 411 | gnome_canvas_path_def_curveto (path_def, |
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| 412 | cx - rx, cy + dy1, |
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| 413 | cx - mx - dx2, cy + my - dy2, |
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| 414 | cx - mx, cy + my); |
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| 415 | gnome_canvas_path_def_curveto (path_def, |
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| 416 | cx - mx + dx2, cy + my + dy2, |
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| 417 | cx - dx1, cy + ry, |
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| 418 | cx, cy + ry); |
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| 419 | gnome_canvas_path_def_curveto (path_def, |
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| 420 | cx + dx1, cy + ry, |
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| 421 | cx + mx - dx2, cy + my + dy2, |
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| 422 | cx + mx, cy + my); |
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| 423 | gnome_canvas_path_def_curveto (path_def, |
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| 424 | cx + mx + dx2, cy + my - dy2, |
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| 425 | cx + rx, cy + dy1, |
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| 426 | cx + rx, cy); |
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| 427 | |
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| 428 | gnome_canvas_path_def_closepath_current(path_def); |
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| 429 | |
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| 430 | gnome_canvas_shape_set_path_def (GNOME_CANVAS_SHAPE (item), path_def); |
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| 431 | gnome_canvas_path_def_unref(path_def); |
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| 432 | re->path_dirty = 0; |
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| 433 | } |
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| 434 | |
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| 435 | if (re_parent_class->update) |
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| 436 | (* re_parent_class->update) (item, affine, clip_path, flags); |
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| 437 | } |
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