Gdk::Graphene::Rect Class Reference

The location and size of a rectangle region. More...

#include <gdkmm/graphene_rect.h>

Public Member Functions
	Rect ()
	Constructs an invalid object.
	Rect (graphene_rect_t *castitem, bool make_a_copy=false)
	Rect (const Rect &src)
Rect &	operator= (const Rect &src)
	Rect (Rect &&other) noexcept
Rect &	operator= (Rect &&other) noexcept
	~Rect () noexcept
void	swap (Rect &other) noexcept
graphene_rect_t *	gobj ()
const graphene_rect_t *	gobj () const
graphene_rect_t *	gobj_copy () const
	Provides access to the underlying C instance. The caller is responsible for freeing it. Use when directly setting fields in structs.
	Rect (float x, float y, float width, float height)
	operator bool () const
	Checks if this instance is valid.
Point	get_origin () const
void	set_origin (const Point & value)
Size	get_size () const
void	set_size (const Size & value)
Point	get_center () const
	Retrieves the coordinates of the center of the given rectangle.
Point	get_top_left () const
	Retrieves the coordinates of the top-left corner of the given rectangle.
Point	get_top_right () const
	Retrieves the coordinates of the top-right corner of the given rectangle.
Point	get_bottom_right () const
	Retrieves the coordinates of the bottom-right corner of the given rectangle.
Point	get_bottom_left () const
	Retrieves the coordinates of the bottom-left corner of the given rectangle.
bool	equal (const Rect & b) const
	Checks whether the two given rectangle are equal.
void	normalize ()
	Normalizes the passed rectangle.
float	get_x () const
	Retrieves the normalized X coordinate of the origin of the given rectangle.
float	get_y () const
	Retrieves the normalized Y coordinate of the origin of the given rectangle.
float	get_width () const
	Retrieves the normalized width of the given rectangle.
float	get_height () const
	Retrieves the normalized height of the given rectangle.
float	get_area () const
	Compute the area of given normalized rectangle.
bool	contains_point (const Point & p) const
	Checks whether a graphene_rect_t contains the given coordinates.
bool	contains_rect (const Rect & b) const
	Checks whether a graphene_rect_t fully contains the given rectangle.

Protected Attributes
graphene_rect_t *	gobject_

Related Symbols
(Note that these are not member symbols.)
void	swap (Rect &lhs, Rect &rhs) noexcept
Gdk::Graphene::Rect	wrap (graphene_rect_t *object, bool take_copy=false)
	A Glib::wrap() method for this object.

Detailed Description

The location and size of a rectangle region.

The width and height of a Gdk::Graphene::Rect can be negative; for instance, a Gdk::Graphene::Rect with an origin of [ 0, 0 ] and a size of [ 10, 10 ] is equivalent to a Gdk::Graphene::Rect with an origin of [ 10, 10 ] and a size of [ -10, -10 ].

Application code can normalize rectangles using normalize(); this function will ensure that the width and height of a rectangle are positive values. All functions taking a Gdk::Graphene::Rect as an argument will internally operate on a normalized copy; all functions returning a Gdk::Graphene::Rect will always return a normalized rectangle.

Since gtkmm 4.12:

Constructor & Destructor Documentation

Rect() [1/5]

Gdk::Graphene::Rect::Rect

(

)

Constructs an invalid object.

E.g. for output arguments to methods. There is not much you can do with the object before it has been assigned a valid value.

Rect() [2/5]

Gdk::Graphene::Rect::Rect ( graphene_rect_t *  castitem, bool  make_a_copy = false  )

explicit

Rect() [3/5]

Gdk::Graphene::Rect::Rect

(

const Rect &

src

)

Rect() [4/5]

Gdk::Graphene::Rect::Rect ( Rect &&  other )

noexcept

~Rect()

Gdk::Graphene::Rect::~Rect ( )

noexcept

Rect() [5/5]

Gdk::Graphene::Rect::Rect	(	float	x,
		float	y,
		float	width,
		float	height
	)

Member Function Documentation

contains_point()

bool Gdk::Graphene::Rect::contains_point

(

const Point &

p

)

const

Checks whether a graphene_rect_t contains the given coordinates.

Since gtkmm 4.12:

Parameters

p	A graphene_point_t.

Returns

true if the rectangle contains the point.

contains_rect()

bool Gdk::Graphene::Rect::contains_rect

(

const Rect &

b

)

const

Checks whether a graphene_rect_t fully contains the given rectangle.

Since gtkmm 4.12:

Parameters

b	A graphene_rect_t.

Returns

true if the rectangle a fully contains b.

equal()

bool Gdk::Graphene::Rect::equal

(

const Rect &

b

)

const

Checks whether the two given rectangle are equal.

Since gtkmm 4.12:

Parameters

b	A graphene_rect_t.

Returns

true if the rectangles are equal.

get_area()

float Gdk::Graphene::Rect::get_area

(

)

const

Compute the area of given normalized rectangle.

Since gtkmm 4.12:

Returns

The area of the normalized rectangle.

get_bottom_left()

Point Gdk::Graphene::Rect::get_bottom_left

(

)

const

Retrieves the coordinates of the bottom-left corner of the given rectangle.

get_bottom_right()

Point Gdk::Graphene::Rect::get_bottom_right

(

)

const

Retrieves the coordinates of the bottom-right corner of the given rectangle.

get_center()

Point Gdk::Graphene::Rect::get_center

(

)

const

Retrieves the coordinates of the center of the given rectangle.

get_height()

float Gdk::Graphene::Rect::get_height

(

)

const

Retrieves the normalized height of the given rectangle.

Since gtkmm 4.12:

Returns

The normalized height of the rectangle.

get_origin()

Point Gdk::Graphene::Rect::get_origin

(

)

const

get_size()

Size Gdk::Graphene::Rect::get_size

(

)

const

get_top_left()

Point Gdk::Graphene::Rect::get_top_left

(

)

const

Retrieves the coordinates of the top-left corner of the given rectangle.

get_top_right()

Point Gdk::Graphene::Rect::get_top_right

(

)

const

Retrieves the coordinates of the top-right corner of the given rectangle.

get_width()

float Gdk::Graphene::Rect::get_width

(

)

const

Retrieves the normalized width of the given rectangle.

Since gtkmm 4.12:

Returns

The normalized width of the rectangle.

get_x()

float Gdk::Graphene::Rect::get_x

(

)

const

Retrieves the normalized X coordinate of the origin of the given rectangle.

Since gtkmm 4.12:

Returns

The normalized X coordinate of the rectangle.

get_y()

float Gdk::Graphene::Rect::get_y

(

)

const

Retrieves the normalized Y coordinate of the origin of the given rectangle.

Since gtkmm 4.12:

Returns

The normalized Y coordinate of the rectangle.

gobj() [1/2]

graphene_rect_t * Gdk::Graphene::Rect::gobj ( )

inline

gobj() [2/2]

const graphene_rect_t * Gdk::Graphene::Rect::gobj ( ) const

inline

gobj_copy()

graphene_rect_t * Gdk::Graphene::Rect::gobj_copy

(

)

const

Provides access to the underlying C instance. The caller is responsible for freeing it. Use when directly setting fields in structs.

normalize()

void Gdk::Graphene::Rect::normalize

(

)

Normalizes the passed rectangle.

This function ensures that the size of the rectangle is made of positive values, and that the origin is the top-left corner of the rectangle.

Since gtkmm 4.12:

operator bool()

Gdk::Graphene::Rect::operator bool ( ) const

explicit

Checks if this instance is valid.

It is valid if and only if it contains a value. For instance,

if (rect)
  do_something()

operator=() [1/2]

Rect & Gdk::Graphene::Rect::operator=

(

const Rect &

src

)

operator=() [2/2]

Rect & Gdk::Graphene::Rect::operator= ( Rect &&  other )

noexcept

set_origin()

void Gdk::Graphene::Rect::set_origin

(

const Point &

value

)

set_size()

void Gdk::Graphene::Rect::set_size

(

const Size &

value

)

swap()

void Gdk::Graphene::Rect::swap ( Rect &  other )

noexcept

Friends And Related Symbol Documentation

swap()

void swap ( Rect &  lhs, Rect &  rhs  )

related

Parameters

lhs	The left-hand side
rhs	The right-hand side

wrap()

Gdk::Graphene::Rect wrap ( graphene_rect_t *  object, bool  take_copy = false  )

related

A Glib::wrap() method for this object.

Parameters

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns

A C++ instance that wraps this C instance.

Member Data Documentation

gobject_

graphene_rect_t* Gdk::Graphene::Rect::gobject_

protected