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/*
* RTK2 : A GUI toolkit for robotics
* Copyright (C) 2001 Andrew Howard ahoward@usc.edu
*
* 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
*
*/
/*
* Desc: Stk region manipulation
* Author: Andrew Howard
* CVS: $Id: rtk_region.c,v 1.4 2005/03/11 21:56:57 rtv Exp $
*
* TODO:
* - Use GdkRegions instead of GdkRectangles.
*/
#include <stdlib.h>
#include "rtk.h"
// Create a new region.
stg_rtk_region_t *stg_rtk_region_create()
{
stg_rtk_region_t *region;
region = calloc(1, sizeof(stg_rtk_region_t));
stg_rtk_region_set_empty(region);
return region;
}
// Destroy a region.
void stg_rtk_region_destroy(stg_rtk_region_t *region)
{
free(region);
return;
}
// Set a region to empty.
void stg_rtk_region_set_empty(stg_rtk_region_t *region)
{
region->rect.x = region->rect.y = 0;
region->rect.width = region->rect.height = 0;
return;
}
// Set the region to the union of the two given regions.
void stg_rtk_region_set_union(stg_rtk_region_t *regiona, stg_rtk_region_t *regionb)
{
GdkRectangle rectc;
if (!stg_rtk_region_test_empty(regionb))
{
if (stg_rtk_region_test_empty(regiona))
regiona->rect = regionb->rect;
else
{
gdk_rectangle_union(®iona->rect, ®ionb->rect, &rectc);
regiona->rect = rectc;
}
}
return;
}
// Set the region to the union of the region with a rectangle
void stg_rtk_region_set_union_rect(stg_rtk_region_t *region, int ax, int ay, int bx, int by)
{
GdkRectangle rectb, rectc;
if (ax <= 0)
rectb.x = 0;
else
rectb.x = ax;
if (ay <= 0)
rectb.y = 0;
else
rectb.y = ay;
if (bx - ax + 1 <= 0)
rectb.width = 0;
else
rectb.width = bx - ax + 1;
if (by - ay + 1 <= 0)
rectb.height = 0;
else
rectb.height = by - ay + 1;
if (rectb.width * rectb.height > 0)
{
if (stg_rtk_region_test_empty(region))
region->rect = rectb;
else
{
gdk_rectangle_union(®ion->rect, &rectb, &rectc);
region->rect = rectc;
}
}
return;
}
// Get the bounding rectangle for the region.
void stg_rtk_region_get_brect(stg_rtk_region_t *region, GdkRectangle *rect)
{
*rect = region->rect;
return;
}
// Test to see if a region is empty.
int stg_rtk_region_test_empty(stg_rtk_region_t *region)
{
if (region->rect.width * region->rect.height == 0)
return 1;
return 0;
}
// Test for intersection betweenr regions.
int stg_rtk_region_test_intersect(stg_rtk_region_t *regiona, stg_rtk_region_t *regionb)
{
GdkRectangle recta, rectb, rectc;
recta = regiona->rect;
recta.width += 1;
rectb = regionb->rect;
rectb.width += 1;
return gdk_rectangle_intersect(®iona->rect, ®ionb->rect, &rectc);
}
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