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/* eel-art-extensions.c - implementation of libart extension functions.
*
* Copyright (C) 2000 Eazel, Inc.
*
* 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,
* see <http://www.gnu.org/licenses/>.
*
* Authors: Darin Adler <darin@eazel.com>
* Ramiro Estrugo <ramiro@eazel.com>
*/
#include <config.h>
#include "eel-art-extensions.h"
#include "eel-lib-self-check-functions.h"
#include <math.h>
const EelDRect eel_drect_empty = { 0.0, 0.0, 0.0, 0.0 };
const EelIRect eel_irect_empty = { 0, 0, 0, 0 };
static void
eel_irect_copy (EelIRect *dest,
const EelIRect *src)
{
dest->x0 = src->x0;
dest->y0 = src->y0;
dest->x1 = src->x1;
dest->y1 = src->y1;
}
static gboolean
eel_irect_is_empty (const EelIRect *src)
{
return (src->x1 <= src->x0 ||
src->y1 <= src->y0);
}
void
eel_irect_union (EelIRect *dest,
const EelIRect *src1,
const EelIRect *src2)
{
if (eel_irect_is_empty (src1))
{
eel_irect_copy (dest, src2);
}
else if (eel_irect_is_empty (src2))
{
eel_irect_copy (dest, src1);
}
else
{
dest->x0 = MIN (src1->x0, src2->x0);
dest->y0 = MIN (src1->y0, src2->y0);
dest->x1 = MAX (src1->x1, src2->x1);
dest->y1 = MAX (src1->y1, src2->y1);
}
}
static void
eel_irect_intersect (EelIRect *dest,
const EelIRect *src1,
const EelIRect *src2)
{
dest->x0 = MAX (src1->x0, src2->x0);
dest->y0 = MAX (src1->y0, src2->y0);
dest->x1 = MIN (src1->x1, src2->x1);
dest->y1 = MIN (src1->y1, src2->y1);
}
/**
* eel_irect_get_width:
*
* @rectangle: An EelIRect.
*
* Returns: The width of the rectangle.
*
*/
int
eel_irect_get_width (EelIRect rectangle)
{
return rectangle.x1 - rectangle.x0;
}
/**
* eel_irect_get_height:
*
* @rectangle: An EelIRect.
*
* Returns: The height of the rectangle.
*
*/
int
eel_irect_get_height (EelIRect rectangle)
{
return rectangle.y1 - rectangle.y0;
}
static void
eel_drect_copy (EelDRect *dest,
const EelDRect *src)
{
dest->x0 = src->x0;
dest->y0 = src->y0;
dest->x1 = src->x1;
dest->y1 = src->y1;
}
static gboolean
eel_drect_is_empty (const EelDRect *src)
{
return (src->x1 <= src->x0 || src->y1 <= src->y0);
}
void
eel_drect_union (EelDRect *dest,
const EelDRect *src1,
const EelDRect *src2)
{
if (eel_drect_is_empty (src1))
{
eel_drect_copy (dest, src2);
}
else if (eel_drect_is_empty (src2))
{
eel_drect_copy (dest, src1);
}
else
{
dest->x0 = MIN (src1->x0, src2->x0);
dest->y0 = MIN (src1->y0, src2->y0);
dest->x1 = MAX (src1->x1, src2->x1);
dest->y1 = MAX (src1->y1, src2->y1);
}
}
gboolean
eel_irect_hits_irect (EelIRect rectangle_a,
EelIRect rectangle_b)
{
EelIRect intersection;
eel_irect_intersect (&intersection, &rectangle_a, &rectangle_b);
return !eel_irect_is_empty (&intersection);
}
gboolean
eel_irect_equal (EelIRect rectangle_a,
EelIRect rectangle_b)
{
return rectangle_a.x0 == rectangle_b.x0
&& rectangle_a.y0 == rectangle_b.y0
&& rectangle_a.x1 == rectangle_b.x1
&& rectangle_a.y1 == rectangle_b.y1;
}
EelIRect
eel_irect_offset_by (EelIRect rectangle,
int x,
int y)
{
rectangle.x0 += x;
rectangle.x1 += x;
rectangle.y0 += y;
rectangle.y1 += y;
return rectangle;
}
EelIRect
eel_irect_scale_by (EelIRect rectangle,
double scale)
{
rectangle.x0 *= scale;
rectangle.x1 *= scale;
rectangle.y0 *= scale;
rectangle.y1 *= scale;
return rectangle;
}
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