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117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-1999. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include <gdk/gdk.h>
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void
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gdk_rectangle_union (GdkRectangle *src1,
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GdkRectangle *src2,
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GdkRectangle *dest)
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{
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gint dest_x, dest_y;
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g_return_if_fail (src1 != NULL);
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g_return_if_fail (src2 != NULL);
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g_return_if_fail (dest != NULL);
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dest_x = MIN (src1->x, src2->x);
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dest_y = MIN (src1->y, src2->y);
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dest->width = MAX (src1->x + src1->width, src2->x + src2->width) - dest_x;
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dest->height = MAX (src1->y + src1->height, src2->y + src2->height) - dest_y;
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dest->x = dest_x;
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dest->y = dest_y;
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}
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gboolean
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gdk_rectangle_intersect (GdkRectangle *src1,
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GdkRectangle *src2,
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GdkRectangle *dest)
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{
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GdkRectangle *temp;
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gint src1_x2, src1_y2;
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gint src2_x2, src2_y2;
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gint return_val;
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g_return_val_if_fail (src1 != NULL, FALSE);
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g_return_val_if_fail (src2 != NULL, FALSE);
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g_return_val_if_fail (dest != NULL, FALSE);
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return_val = FALSE;
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if (src2->x < src1->x)
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{
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temp = src1;
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src1 = src2;
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src2 = temp;
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}
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src1_x2 = src1->x + src1->width;
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src2_x2 = src2->x + src2->width;
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if (src2->x < src1_x2)
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{
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dest->x = src2->x;
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if (src1_x2 < src2_x2)
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dest->width = src1_x2 - dest->x;
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else
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dest->width = src2_x2 - dest->x;
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if (src2->y < src1->y)
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{
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temp = src1;
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src1 = src2;
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src2 = temp;
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}
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src1_y2 = src1->y + src1->height;
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src2_y2 = src2->y + src2->height;
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if (src2->y < src1_y2)
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{
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return_val = TRUE;
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dest->y = src2->y;
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if (src1_y2 < src2_y2)
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dest->height = src1_y2 - dest->y;
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else
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dest->height = src2_y2 - dest->y;
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if (dest->height == 0)
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return_val = FALSE;
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if (dest->width == 0)
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return_val = FALSE;
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}
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}
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if (!return_val)
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{
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dest->width = 0;
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dest->height = 0;
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}
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return return_val;
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}
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