1 /* Dia -- an diagram creation/manipulation program
2 * Copyright (C) 1998 Alexander Larsson
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 static GdkColormap
*colormap
= NULL
;
29 Color color_black
= { 0.0f
, 0.0f
, 0.0f
};
30 Color color_white
= { 1.0f
, 1.0f
, 1.0f
};
33 GdkColor color_gdk_black
, color_gdk_white
;
35 gboolean _color_initialized
= FALSE
;
37 /** Initialize color access (gdk) and set up default colors.
42 if (!_color_initialized
) {
43 GdkVisual
*visual
= gtk_widget_get_default_visual();
44 colormap
= gdk_colormap_new (visual
, FALSE
);
46 _color_initialized
= TRUE
;
48 color_convert(&color_black
, &color_gdk_black
);
49 color_convert(&color_white
, &color_gdk_white
);
53 /** Allocate a new color object wtih the given values.
54 * @param r Red component (0 <= r <= 1)
55 * @param g Green component (0 <= g <= 1)
56 * @param b Blue component (0 <= b <= 1)
57 * @returns A newly allocated color object. This should be freed after use.
60 color_new_rgb(float r
, float g
, float b
)
62 Color
*col
= g_new(Color
, 1);
69 /** Convert a Dia color object to GDK style, including handling allocation.
70 * @param color A color object. This will not be kept by this function.
71 * @param gdkcolor Return value: GDK color object to fill in.
74 color_convert(Color
*color
, GdkColor
*gdkcolor
)
76 gdkcolor
->red
= color
->red
*65535;
77 gdkcolor
->green
= color
->green
*65535;
78 gdkcolor
->blue
= color
->blue
*65535;
80 if (_color_initialized
) {
81 if (!gdk_colormap_alloc_color (colormap
, gdkcolor
, TRUE
, TRUE
))
82 g_warning ("color_convert failed.");
84 g_warning("Can't color_convert in non-interactive app (w/o color_init())");
88 /** Compare two color objects.
89 * @param color1 One color object
90 * @param color2 Another color object.
91 * @returns TRUE if the color objects are the same color.
94 color_equals(Color
*color1
, Color
*color2
)
96 return (color1
->red
== color2
->red
) &&
97 (color1
->green
== color2
->green
) &&
98 (color1
->blue
== color2
->blue
);