mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-10 19:00:08 +00:00
230 lines
6.8 KiB
C
230 lines
6.8 KiB
C
/* GDK - The GIMP Drawing Kit
|
||
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
|
||
*
|
||
* This library is free software; you can redistribute it and/or
|
||
* modify it under the terms of the GNU Lesser General Public
|
||
* License as published by the Free Software Foundation; either
|
||
* version 2 of the License, or (at your option) any later version.
|
||
*
|
||
* This 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
|
||
* Lesser General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU Lesser General Public
|
||
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
/*
|
||
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
|
||
* file for a list of people on the GTK+ Team. See the ChangeLog
|
||
* files for a list of changes. These files are distributed with
|
||
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
|
||
*/
|
||
|
||
#include "config.h"
|
||
|
||
#include "gdkrectangle.h"
|
||
#include <cairo-gobject.h>
|
||
|
||
|
||
/**
|
||
* GdkRectangle:
|
||
* @x: the x coordinate of the top left corner
|
||
* @y: the y coordinate of the top left corner
|
||
* @width: the width of the rectangle
|
||
* @height: the height of the rectangle
|
||
*
|
||
* A `GdkRectangle` data type for representing rectangles.
|
||
*
|
||
* `GdkRectangle` is identical to `cairo_rectangle_t`. Together with Cairo’s
|
||
* `cairo_region_t` data type, these are the central types for representing
|
||
* sets of pixels.
|
||
*
|
||
* The intersection of two rectangles can be computed with
|
||
* [method@Gdk.Rectangle.intersect]; to find the union of two rectangles use
|
||
* [method@Gdk.Rectangle.union].
|
||
*
|
||
* The `cairo_region_t` type provided by Cairo is usually used for managing
|
||
* non-rectangular clipping of graphical operations.
|
||
*
|
||
* The Graphene library has a number of other data types for regions and
|
||
* volumes in 2D and 3D.
|
||
*/
|
||
|
||
|
||
/**
|
||
* gdk_rectangle_union:
|
||
* @src1: a `GdkRectangle`
|
||
* @src2: a `GdkRectangle`
|
||
* @dest: (out): return location for the union of @src1 and @src2
|
||
*
|
||
* Calculates the union of two rectangles.
|
||
*
|
||
* The union of rectangles @src1 and @src2 is the smallest rectangle which
|
||
* includes both @src1 and @src2 within it. It is allowed for @dest to be
|
||
* the same as either @src1 or @src2.
|
||
*
|
||
* Note that this function does not ignore 'empty' rectangles (ie. with
|
||
* zero width or height).
|
||
*/
|
||
void
|
||
gdk_rectangle_union (const GdkRectangle *src1,
|
||
const GdkRectangle *src2,
|
||
GdkRectangle *dest)
|
||
{
|
||
int dest_x, dest_y;
|
||
|
||
g_return_if_fail (src1 != NULL);
|
||
g_return_if_fail (src2 != NULL);
|
||
g_return_if_fail (dest != NULL);
|
||
|
||
dest_x = MIN (src1->x, src2->x);
|
||
dest_y = MIN (src1->y, src2->y);
|
||
dest->width = MAX (src1->x + src1->width, src2->x + src2->width) - dest_x;
|
||
dest->height = MAX (src1->y + src1->height, src2->y + src2->height) - dest_y;
|
||
dest->x = dest_x;
|
||
dest->y = dest_y;
|
||
}
|
||
|
||
/**
|
||
* gdk_rectangle_intersect:
|
||
* @src1: a `GdkRectangle`
|
||
* @src2: a `GdkRectangle`
|
||
* @dest: (out caller-allocates) (optional): return location for the
|
||
* intersection of @src1 and @src2
|
||
*
|
||
* Calculates the intersection of two rectangles.
|
||
*
|
||
* It is allowed for @dest to be the same as either @src1 or @src2.
|
||
* If the rectangles do not intersect, @dest’s width and height is set
|
||
* to 0 and its x and y values are undefined. If you are only interested
|
||
* in whether the rectangles intersect, but not in the intersecting area
|
||
* itself, pass %NULL for @dest.
|
||
*
|
||
* Returns: %TRUE if the rectangles intersect.
|
||
*/
|
||
gboolean
|
||
gdk_rectangle_intersect (const GdkRectangle *src1,
|
||
const GdkRectangle *src2,
|
||
GdkRectangle *dest)
|
||
{
|
||
int dest_x, dest_y;
|
||
int dest_x2, dest_y2;
|
||
int return_val;
|
||
|
||
g_return_val_if_fail (src1 != NULL, FALSE);
|
||
g_return_val_if_fail (src2 != NULL, FALSE);
|
||
|
||
return_val = FALSE;
|
||
|
||
dest_x = MAX (src1->x, src2->x);
|
||
dest_y = MAX (src1->y, src2->y);
|
||
dest_x2 = MIN (src1->x + src1->width, src2->x + src2->width);
|
||
dest_y2 = MIN (src1->y + src1->height, src2->y + src2->height);
|
||
|
||
if (dest_x2 > dest_x && dest_y2 > dest_y)
|
||
{
|
||
if (dest)
|
||
{
|
||
dest->x = dest_x;
|
||
dest->y = dest_y;
|
||
dest->width = dest_x2 - dest_x;
|
||
dest->height = dest_y2 - dest_y;
|
||
}
|
||
return_val = TRUE;
|
||
}
|
||
else if (dest)
|
||
{
|
||
dest->width = 0;
|
||
dest->height = 0;
|
||
}
|
||
|
||
return return_val;
|
||
}
|
||
|
||
/**
|
||
* gdk_rectangle_contains_point:
|
||
* @rect: a `GdkRectangle`
|
||
* @x: X coordinate
|
||
* @y: Y coordinate
|
||
*
|
||
* Returns %TRUE if @rect contains the point described by @x and @y.
|
||
*
|
||
* Returns: %TRUE if @rect contains the point
|
||
**/
|
||
gboolean
|
||
gdk_rectangle_contains_point (const GdkRectangle *rect,
|
||
int x,
|
||
int y)
|
||
{
|
||
g_return_val_if_fail (rect != NULL, FALSE);
|
||
|
||
return x >= rect->x &&
|
||
x < rect->x + rect->width &&
|
||
y >= rect->y &&
|
||
y < rect->y + rect->height;
|
||
}
|
||
|
||
/**
|
||
* gdk_rectangle_equal:
|
||
* @rect1: a `GdkRectangle`
|
||
* @rect2: a `GdkRectangle`
|
||
*
|
||
* Checks if the two given rectangles are equal.
|
||
*
|
||
* Returns: %TRUE if the rectangles are equal.
|
||
*/
|
||
gboolean
|
||
gdk_rectangle_equal (const GdkRectangle *rect1,
|
||
const GdkRectangle *rect2)
|
||
{
|
||
return rect1->x == rect2->x
|
||
&& rect1->y == rect2->y
|
||
&& rect1->width == rect2->width
|
||
&& rect1->height == rect2->height;
|
||
}
|
||
|
||
static GdkRectangle *
|
||
gdk_rectangle_copy (const GdkRectangle *rectangle)
|
||
{
|
||
GdkRectangle *result = g_new (GdkRectangle, 1);
|
||
*result = *rectangle;
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Transforms between identical boxed types.
|
||
*/
|
||
static void
|
||
gdk_rectangle_value_transform_rect (const GValue *src_value, GValue *dest_value)
|
||
{
|
||
g_value_set_boxed (dest_value, g_value_get_boxed (src_value));
|
||
}
|
||
|
||
/* Allow GValue transformation between the identical structs
|
||
* cairo_rectangle_int_t and GdkRectangle.
|
||
*/
|
||
static void
|
||
gdk_rectangle_register_value_transform_funcs (GType gtype_gdk_rectangle)
|
||
{
|
||
/* This function is called from the first call to gdk_rectangle_get_type(),
|
||
* before g_once_init_leave() has been called.
|
||
* If gdk_rectangle_get_type() is called from here (e.g. via
|
||
* GDK_TYPE_RECTANGLE), the program will wait indefinitely at
|
||
* g_once_init_enter() in gdk_rectangle_get_type().
|
||
*/
|
||
g_value_register_transform_func (CAIRO_GOBJECT_TYPE_RECTANGLE_INT,
|
||
gtype_gdk_rectangle,
|
||
gdk_rectangle_value_transform_rect);
|
||
g_value_register_transform_func (gtype_gdk_rectangle,
|
||
CAIRO_GOBJECT_TYPE_RECTANGLE_INT,
|
||
gdk_rectangle_value_transform_rect);
|
||
}
|
||
|
||
G_DEFINE_BOXED_TYPE_WITH_CODE (GdkRectangle, gdk_rectangle,
|
||
gdk_rectangle_copy,
|
||
g_free,
|
||
gdk_rectangle_register_value_transform_funcs (g_define_type_id))
|
||
|