wxPoint Class Reference

#include </home/zeitlin/src/wx/github/interface/wx/gdicmn.h>

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Detailed Description

A wxPoint is a useful data structure for graphics operations.

It contains integer x and y members. See wxRealPoint for a floating point version.

Note that the width and height stored inside a wxPoint object may be negative and that wxPoint functions do not perform any check against negative values (this is used to e.g. store the special -1 value in wxDefaultPosition instance).

Library:  wxCore

Category:  Data Structures

Predefined objects/pointers: wxDefaultPosition

参照:

wxRealPoint

Public Member Functions
	wxPoint ()
	Constructs a point.
	wxPoint (int x, int y)
	Initializes the point object with the given x and y coordinates.
	wxPoint (const wxRealPoint &pt)
	Converts the given wxRealPoint (with floating point coordinates) to a wxPoint instance.
Miscellaneous operators
Note that these operators are documented as class members (to make them easier to find) but, as their prototype shows, they are implemented as global operators; note that this is transparent to the user but it helps to understand why the following functions are documented to take the wxPoint they operate on as an explicit argument.
wxPoint &	operator= (const wxPoint &pt)
bool	operator== (const wxPoint &p1, const wxPoint &p2)
bool	operator!= (const wxPoint &p1, const wxPoint &p2)
wxPoint	operator+ (const wxPoint &p1, const wxPoint &p2)
wxPoint	operator- (const wxPoint &p1, const wxPoint &p2)
wxPoint &	operator+= (const wxPoint &pt)
wxPoint &	operator-= (const wxPoint &pt)
wxPoint	operator+ (const wxPoint &pt, const wxSize &sz)
wxPoint	operator- (const wxPoint &pt, const wxSize &sz)
wxPoint	operator+ (const wxSize &sz, const wxPoint &pt)
wxPoint	operator- (const wxSize &sz, const wxPoint &pt)
wxPoint &	operator+= (const wxSize &sz)
wxPoint &	operator-= (const wxSize &sz)
wxSize	operator/ (const wxPoint &sz, int factor)
wxSize	operator* (const wxPoint &sz, int factor)
wxSize	operator* (int factor, const wxSize &sz)
wxSize &	operator/= (int factor)
wxSize &	operator*= (int factor)
Defaults handling.
Test for and set non-specified wxPoint components. Although a wxPoint is always initialized to (0, 0), wxWidgets commonly uses wxDefaultCoord (defined as -1) to indicate that a point hasn't been initialized or specified. In particular, wxDefaultPosition is used in many places with this meaning.
bool	IsFullySpecified () const
	Returns true if neither of the point components is equal to wxDefaultCoord.
void	SetDefaults (const wxPoint &pt)
	Combine this object with another one replacing the uninitialized values.
Public Attributes
int	x
	x member.
int	y
	y member.

List of all members.

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Constructor & Destructor Documentation

wxPoint::wxPoint

(

)

Constructs a point.

Initializes the internal x and y coordinates to zero.

wxPoint::wxPoint	(	int	x,
		int	y
	)

Initializes the point object with the given x and y coordinates.

wxPoint::wxPoint

(

const wxRealPoint &

pt

)

Converts the given wxRealPoint (with floating point coordinates) to a wxPoint instance.

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Member Function Documentation

bool wxPoint::IsFullySpecified

(

)

const

Returns true if neither of the point components is equal to wxDefaultCoord.

This method is typically used before calling SetDefaults().

Since:

2.9.2

bool wxPoint::operator!=	(	const wxPoint &	p1,
		const wxPoint &	p2
	)

wxSize wxPoint::operator*	(	int	factor,
		const wxSize &	sz
	)

wxSize wxPoint::operator*	(	const wxPoint &	sz,
		int	factor
	)

wxSize& wxPoint::operator*=

(

int

factor

)

wxPoint wxPoint::operator+	(	const wxPoint &	pt,
		const wxSize &	sz
	)

wxPoint wxPoint::operator+	(	const wxPoint &	p1,
		const wxPoint &	p2
	)

wxPoint wxPoint::operator+	(	const wxSize &	sz,
		const wxPoint &	pt
	)

wxPoint& wxPoint::operator+=

(

const wxSize &

sz

)

wxPoint& wxPoint::operator+=

(

const wxPoint &

pt

)

wxPoint wxPoint::operator-	(	const wxPoint &	p1,
		const wxPoint &	p2
	)

wxPoint wxPoint::operator-	(	const wxSize &	sz,
		const wxPoint &	pt
	)

wxPoint wxPoint::operator-	(	const wxPoint &	pt,
		const wxSize &	sz
	)

wxPoint& wxPoint::operator-=

(

const wxPoint &

pt

)

wxPoint& wxPoint::operator-=

(

const wxSize &

sz

)

wxSize wxPoint::operator/	(	const wxPoint &	sz,
		int	factor
	)

wxSize& wxPoint::operator/=

(

int

factor

)

wxPoint& wxPoint::operator=

(

const wxPoint &

pt

)

bool wxPoint::operator==	(	const wxPoint &	p1,
		const wxPoint &	p2
	)

void wxPoint::SetDefaults

(

const wxPoint &

pt

)

Combine this object with another one replacing the uninitialized values.

It is typically used like this:

        if ( !pos.IsFullySpecified() )
        {
            pos.SetDefaults(GetDefaultPosition());
        }

参照:

IsFullySpecified()

Since:

2.9.2

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Member Data Documentation

int wxPoint::x

x member.

int wxPoint::y

y member.