138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/* LIBPIKA - The PIKA Library
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* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
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*
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* pikarectangle.c
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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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <glib.h>
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#include "pikarectangle.h"
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/**
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* SECTION: pikarectangle
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* @title: pikarectangle
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* @short_description: Utility functions dealing with rectangle extents.
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*
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* Utility functions dealing with rectangle extents.
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**/
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/**
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* pika_rectangle_intersect:
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* @x1: origin of first rectangle
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* @y1: origin of first rectangle
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* @width1: width of first rectangle
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* @height1: height of first rectangle
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* @x2: origin of second rectangle
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* @y2: origin of second rectangle
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* @width2: width of second rectangle
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* @height2: height of second rectangle
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* @dest_x: (out) (optional): return location for origin of intersection,
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* or %NULL
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* @dest_y: (out) (optional): return location for origin of intersection,
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* or %NULL
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* @dest_width: (out) (optional): return location for width of intersection,
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* or %NULL
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* @dest_height: (out) (optional): return location for height of intersection,
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* or %NULL
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*
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* Calculates the intersection of two rectangles.
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*
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* Returns: %TRUE if the intersection is non-empty, %FALSE otherwise
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*
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* Since: 2.4
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**/
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gboolean
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pika_rectangle_intersect (gint x1,
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gint y1,
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gint width1,
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gint height1,
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gint x2,
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gint y2,
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gint width2,
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gint height2,
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gint *dest_x,
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gint *dest_y,
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gint *dest_width,
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gint *dest_height)
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{
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gint d_x, d_y;
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gint d_w, d_h;
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d_x = MAX (x1, x2);
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d_y = MAX (y1, y2);
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d_w = MIN (x1 + width1, x2 + width2) - d_x;
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d_h = MIN (y1 + height1, y2 + height2) - d_y;
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if (dest_x) *dest_x = d_x;
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if (dest_y) *dest_y = d_y;
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if (dest_width) *dest_width = d_w;
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if (dest_height) *dest_height = d_h;
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return (d_w > 0 && d_h > 0);
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}
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/**
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* pika_rectangle_union:
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* @x1: origin of first rectangle
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* @y1: origin of first rectangle
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* @width1: width of first rectangle
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* @height1: height of first rectangle
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* @x2: origin of second rectangle
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* @y2: origin of second rectangle
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* @width2: width of second rectangle
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* @height2: height of second rectangle
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* @dest_x: (out) (optional): return location for origin of union, or %NULL
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* @dest_y: (out) (optional): return location for origin of union, or %NULL
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* @dest_width: (out) (optional): return location for width of union, or %NULL
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* @dest_height: (out) (optional): return location for height of union, or %NULL
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*
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* Calculates the union of two rectangles.
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*
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* Since: 2.8
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**/
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void
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pika_rectangle_union (gint x1,
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gint y1,
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gint width1,
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gint height1,
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gint x2,
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gint y2,
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gint width2,
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gint height2,
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gint *dest_x,
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gint *dest_y,
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gint *dest_width,
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gint *dest_height)
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{
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gint d_x, d_y;
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gint d_w, d_h;
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d_x = MIN (x1, x2);
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d_y = MIN (y1, y2);
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d_w = MAX (x1 + width1, x2 + width2) - d_x;
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d_h = MAX (y1 + height1, y2 + height2) - d_y;
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if (dest_x) *dest_x = d_x;
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if (dest_y) *dest_y = d_y;
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if (dest_width) *dest_width = d_w;
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if (dest_height) *dest_height = d_h;
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}
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