Points and Rectangles
Points and Rectangles — Simple graphical data types
|
|
Includes
#include <gdk/gdk.h>
Description
GDK provides the GdkPoint and GdkRectangle data types for representing pixels
and sets of pixels on the screen. Together with Cairo’s cairo_region_t data
type, they make up the central types for representing graphical data.
A GdkPoint represents an x and y coordinate of a point.
A GdkRectangle represents the position and size of a rectangle.
The intersection of two rectangles can be computed with
gdk_rectangle_intersect(). To find the union of two rectangles use
gdk_rectangle_union().
cairo_region_t is usually used for managing clipping of graphical operations.
Functions
gdk_rectangle_intersect ()
gboolean
gdk_rectangle_intersect (const GdkRectangle *src1,
const GdkRectangle *src2,
GdkRectangle *dest);
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.
gdk_rectangle_union ()
void
gdk_rectangle_union (const GdkRectangle *src1,
const GdkRectangle *src2,
GdkRectangle *dest);
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).
gdk_rectangle_equal ()
gboolean
gdk_rectangle_equal (const GdkRectangle *rect1,
const GdkRectangle *rect2);
Checks if the two given rectangles are equal.
Returns
TRUE if the rectangles are equal.
Since: 3.20
Types and Values
struct GdkPoint
struct GdkPoint {
gint x;
gint y;
};
Defines the x and y coordinates of a point.
GdkRectangle
typedef struct {
int x, y;
int width, height;
} GdkRectangle;
Defines the position and size of a rectangle. It is identical to
cairo_rectangle_int_t.