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192 lines
4.4 KiB
C
192 lines
4.4 KiB
C
/* eel-art-extensions.c - implementation of libart extension functions.
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*
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* Copyright (C) 2000 Eazel, Inc.
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*
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* The Gnome 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 License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* The Gnome 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 the Gnome Library; see the file COPYING.LIB. If not,
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* see <http://www.gnu.org/licenses/>.
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*
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* Authors: Darin Adler <darin@eazel.com>
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* Ramiro Estrugo <ramiro@eazel.com>
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*/
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#include <config.h>
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#include "eel-art-extensions.h"
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#include "eel-lib-self-check-functions.h"
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#include <math.h>
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const EelDRect eel_drect_empty = { 0.0, 0.0, 0.0, 0.0 };
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const EelIRect eel_irect_empty = { 0, 0, 0, 0 };
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static void
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eel_irect_copy (EelIRect *dest,
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const EelIRect *src)
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{
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dest->x0 = src->x0;
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dest->y0 = src->y0;
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dest->x1 = src->x1;
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dest->y1 = src->y1;
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}
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static gboolean
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eel_irect_is_empty (const EelIRect *src)
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{
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return (src->x1 <= src->x0 ||
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src->y1 <= src->y0);
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}
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void
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eel_irect_union (EelIRect *dest,
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const EelIRect *src1,
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const EelIRect *src2)
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{
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if (eel_irect_is_empty (src1))
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{
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eel_irect_copy (dest, src2);
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}
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else if (eel_irect_is_empty (src2))
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{
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eel_irect_copy (dest, src1);
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}
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else
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{
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dest->x0 = MIN (src1->x0, src2->x0);
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dest->y0 = MIN (src1->y0, src2->y0);
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dest->x1 = MAX (src1->x1, src2->x1);
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dest->y1 = MAX (src1->y1, src2->y1);
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}
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}
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static void
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eel_irect_intersect (EelIRect *dest,
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const EelIRect *src1,
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const EelIRect *src2)
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{
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dest->x0 = MAX (src1->x0, src2->x0);
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dest->y0 = MAX (src1->y0, src2->y0);
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dest->x1 = MIN (src1->x1, src2->x1);
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dest->y1 = MIN (src1->y1, src2->y1);
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}
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/**
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* eel_irect_get_width:
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*
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* @rectangle: An EelIRect.
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*
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* Returns: The width of the rectangle.
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*
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*/
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int
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eel_irect_get_width (EelIRect rectangle)
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{
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return rectangle.x1 - rectangle.x0;
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}
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/**
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* eel_irect_get_height:
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*
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* @rectangle: An EelIRect.
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*
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* Returns: The height of the rectangle.
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*
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*/
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int
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eel_irect_get_height (EelIRect rectangle)
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{
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return rectangle.y1 - rectangle.y0;
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}
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static void
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eel_drect_copy (EelDRect *dest,
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const EelDRect *src)
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{
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dest->x0 = src->x0;
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dest->y0 = src->y0;
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dest->x1 = src->x1;
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dest->y1 = src->y1;
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}
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static gboolean
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eel_drect_is_empty (const EelDRect *src)
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{
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return (src->x1 <= src->x0 || src->y1 <= src->y0);
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}
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void
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eel_drect_union (EelDRect *dest,
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const EelDRect *src1,
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const EelDRect *src2)
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{
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if (eel_drect_is_empty (src1))
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{
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eel_drect_copy (dest, src2);
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}
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else if (eel_drect_is_empty (src2))
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{
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eel_drect_copy (dest, src1);
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}
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else
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{
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dest->x0 = MIN (src1->x0, src2->x0);
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dest->y0 = MIN (src1->y0, src2->y0);
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dest->x1 = MAX (src1->x1, src2->x1);
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dest->y1 = MAX (src1->y1, src2->y1);
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}
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}
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gboolean
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eel_irect_hits_irect (EelIRect rectangle_a,
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EelIRect rectangle_b)
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{
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EelIRect intersection;
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eel_irect_intersect (&intersection, &rectangle_a, &rectangle_b);
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return !eel_irect_is_empty (&intersection);
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}
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gboolean
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eel_irect_equal (EelIRect rectangle_a,
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EelIRect rectangle_b)
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{
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return rectangle_a.x0 == rectangle_b.x0
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&& rectangle_a.y0 == rectangle_b.y0
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&& rectangle_a.x1 == rectangle_b.x1
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&& rectangle_a.y1 == rectangle_b.y1;
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}
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EelIRect
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eel_irect_offset_by (EelIRect rectangle,
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int x,
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int y)
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{
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rectangle.x0 += x;
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rectangle.x1 += x;
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rectangle.y0 += y;
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rectangle.y1 += y;
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return rectangle;
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}
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EelIRect
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eel_irect_scale_by (EelIRect rectangle,
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double scale)
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{
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rectangle.x0 *= scale;
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rectangle.x1 *= scale;
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rectangle.y0 *= scale;
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rectangle.y1 *= scale;
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return rectangle;
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}
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