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![Alexander Larsson](/assets/img/avatar_default.png)
2008-12-15 Alexander Larsson <alexl@redhat.com> * Makefile.am: * acconfig.h: * configure.in: * eel/ * libnautilus-private/Makefile.am: Import eel into nautilus. svn path=/trunk/; revision=14815
309 lines
7 KiB
C
309 lines
7 KiB
C
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
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/* eel-art-extensions.c - implementation of libart extension functions.
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Copyright (C) 2000 Eazel, Inc.
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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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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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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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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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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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const EelIPoint eel_ipoint_max = { G_MAXINT, G_MAXINT };
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const EelIPoint eel_ipoint_min = { G_MININT, G_MININT };
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const EelIPoint eel_ipoint_zero = { 0, 0 };
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const EelDimensions eel_dimensions_empty = { 0, 0 };
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void
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eel_irect_copy (EelIRect *dest, 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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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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if (eel_irect_is_empty (src1)) {
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eel_irect_copy (dest, src2);
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} else if (eel_irect_is_empty (src2)) {
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eel_irect_copy (dest, src1);
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} else {
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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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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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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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EelIRect
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eel_irect_assign (int x,
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int y,
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int width,
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int height)
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{
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EelIRect rectangle;
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rectangle.x0 = x;
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rectangle.y0 = y;
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rectangle.x1 = rectangle.x0 + width;
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rectangle.y1 = rectangle.y0 + height;
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return rectangle;
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}
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/**
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* eel_irect_assign_dimensions:
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*
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* @x: X coodinate for resulting rectangle.
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* @y: Y coodinate for resulting rectangle.
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* @dimensions: A EelDimensions structure for the rect's width and height.
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*
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* Returns: An EelIRect with the given coordinates and dimensions.
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*/
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EelIRect
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eel_irect_assign_dimensions (int x,
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int y,
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EelDimensions dimensions)
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{
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EelIRect rectangle;
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rectangle.x0 = x;
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rectangle.y0 = y;
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rectangle.x1 = rectangle.x0 + dimensions.width;
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rectangle.y1 = rectangle.y0 + dimensions.height;
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return rectangle;
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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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eel_drect_copy (dest, src2);
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} else if (eel_drect_is_empty (src2)) {
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eel_drect_copy (dest, src1);
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} else {
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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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/**
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* eel_irect_contains_point:
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*
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* @rectangle: An EelIRect.
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* @x: X coordinate to test.
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* @y: Y coordinate to test.
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*
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* Returns: A boolean value indicating whether the rectangle
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* contains the x,y coordinate.
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*
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*/
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gboolean
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eel_irect_contains_point (EelIRect rectangle,
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int x,
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int y)
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{
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return x >= rectangle.x0
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&& x <= rectangle.x1
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&& y >= rectangle.y0
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&& y <= rectangle.y1;
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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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/**
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* eel_irect_align:
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*
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* @container: The rectangle that is to contain the aligned rectangle.
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* @aligned_width: Width of rectangle being algined.
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* @aligned_height: Height of rectangle being algined.
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* @x_alignment: X alignment.
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* @y_alignment: Y alignment.
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*
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* Returns: A rectangle aligned within a container rectangle
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* using the given alignment parameters.
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*/
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EelIRect
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eel_irect_align (EelIRect container,
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int aligned_width,
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int aligned_height,
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float x_alignment,
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float y_alignment)
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{
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EelIRect aligned;
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int available_width;
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int available_height;
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if (eel_irect_is_empty (&container)) {
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return eel_irect_empty;
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}
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if (aligned_width == 0 || aligned_height == 0) {
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return eel_irect_empty;
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}
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/* Make sure the aligment parameters are within range */
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x_alignment = MAX (0, x_alignment);
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x_alignment = MIN (1.0, x_alignment);
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y_alignment = MAX (0, y_alignment);
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y_alignment = MIN (1.0, y_alignment);
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available_width = eel_irect_get_width (container) - aligned_width;
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available_height = eel_irect_get_height (container) - aligned_height;
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aligned.x0 = floor (container.x0 + (available_width * x_alignment) + 0.5);
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aligned.y0 = floor (container.y0 + (available_height * y_alignment) + 0.5);
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aligned.x1 = aligned.x0 + aligned_width;
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aligned.y1 = aligned.y0 + aligned_height;
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return aligned;
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}
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/**
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* eel_dimensions_are_empty:
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*
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* @dimensions: A EelDimensions structure.
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*
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* Returns: Whether the dimensions are empty.
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*/
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gboolean
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eel_dimensions_are_empty (EelDimensions dimensions)
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{
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return dimensions.width <= 0 || dimensions.height <= 0;
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}
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EelIRect
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eel_irect_offset_by (EelIRect rectangle, int x, 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, 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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