QtCore.QPoint Class Reference

The QPoint class defines a point in the plane using integer precision. More...

Inheritance diagram for QtCore.QPoint:

Collaboration diagram for QtCore.QPoint:

Public Member Functions
override bool	Equals (object o)
override int	GetHashCode ()
	QPoint ()
	QPoint (QPoint copy)
	QPoint (int xpos, int ypos)
virtual void	CreateProxy ()
new bool	IsNull ()
new int	ManhattanLength ()
new int	Rx ()
new int	Ry ()
new void	Dispose ()

Static Public Member Functions
static bool	operator!= (QPoint arg1, QPoint arg2)
static QPoint	operator* (QPoint arg1, float arg2)
static QPoint	operator* (QPoint arg1, double arg2)
static QPoint	operator* (QPoint arg1, int arg2)
static QPoint	operator+ (QPoint arg1, QPoint arg2)
static QPoint	operator- (QPoint arg1)
static QPoint	operator- (QPoint arg1, QPoint arg2)
static QPoint	operator/ (QPoint arg1, double arg2)
static bool	operator== (QPoint arg1, QPoint arg2)

Protected Member Functions
	QPoint (System.Type dummy)

Protected Attributes
SmokeInvocation	interceptor

Properties
new int	X [get, set]
new int	Y [get, set]
virtual System.IntPtr	SmokeObject [get, set]

Detailed Description

The QPoint class defines a point in the plane using integer precision.

A point is specified by a x coordinate and an y coordinate which can be accessed using the x() and y() functions. The isNull() function returns true if both x and y are set to 0. The coordinates can be set (or altered) using the setX() and setY() functions, or alternatively the rx() and ry() functions which return references to the coordinates (allowing direct manipulation).

Given a point p, the following statements are all equivalent:

QPoint p;

p.setX(p.x() + 1);

p += QPoint(1, 0);

p.rx()++;

A QPoint object can also be used as a vector: Addition and subtraction are defined as for vectors (each component is added separately). A QPoint object can also be divided or multiplied by an int or a qreal.

In addition, the QPoint class provides the manhattanLength() function which gives an inexpensive approximation of the length of the QPoint object interpreted as a vector. Finally, QPoint objects can be streamed as well as compared.

See also QPointF and QPolygon.

Constructor & Destructor Documentation

QtCore.QPoint.QPoint ( System.Type  dummy )

protected

QtCore.QPoint.QPoint

(

)

Constructs a null point, i.e. with coordinates (0, 0)

See also isNull().

QtCore.QPoint.QPoint

(

QPoint

copy

)

Constructs a null point, i.e. with coordinates (0, 0)

See also isNull().

QtCore.QPoint.QPoint	(	int	xpos,
		int	ypos
	)

Constructs a point with the given coordinates (x, y).

See also setX() and setY().

Member Function Documentation

virtual void QtCore.QPoint.CreateProxy ( )

virtual

new void QtCore.QPoint.Dispose

(

)

override bool QtCore.QPoint.Equals

(

object

o

)

override int QtCore.QPoint.GetHashCode

(

)

new bool QtCore.QPoint.IsNull

(

)

Returns true if both the x and y coordinates are set to 0, otherwise returns false.

new int QtCore.QPoint.ManhattanLength

(

)

Returns the sum of the absolute values of x() and y(), traditionally known as the "Manhattan length" of the vector from the origin to the point. For example:

QPoint oldPosition;

MyWidget::mouseMoveEvent(QMouseEvent *event)

{

QPoint point = event->pos() - oldPosition;

if (point.manhattanLength() > 3)

// the mouse has moved more than 3 pixels since the oldPosition

}

This is a useful, and quick to calculate, approximation to the true length:

double trueLength = sqrt(pow(x(), 2) + pow(y(), 2));

The tradition of "Manhattan length" arises because such distances apply to travelers who can only travel on a rectangular grid, like the streets of Manhattan.

static bool QtCore.QPoint.operator!= ( QPoint  arg1, QPoint  arg2  )

static

static QPoint QtCore.QPoint.operator* ( QPoint  arg1, float  arg2  )

static

Returns a copy of the given point multiplied by the given factor.

Note that the result is rounded to the nearest integer as points are held as integers. Use QPointF for floating point accuracy.

This function was introduced in Qt 4.8.

See also QPoint::operator*=().

static QPoint QtCore.QPoint.operator* ( QPoint  arg1, double  arg2  )

static

Returns a copy of the given point multiplied by the given factor.

Note that the result is rounded to the nearest integer as points are held as integers. Use QPointF for floating point accuracy.

This function was introduced in Qt 4.8.

See also QPoint::operator*=().

static QPoint QtCore.QPoint.operator* ( QPoint  arg1, int  arg2  )

static

Returns a copy of the given point multiplied by the given factor.

This function was introduced in Qt 4.8.

See also QPoint::operator*=().

static QPoint QtCore.QPoint.operator+ ( QPoint  arg1, QPoint  arg2  )

static

Returns a QPoint object that is the sum of the given points, p1 and p2; each component is added separately.

See also QPoint::operator+=().

static QPoint QtCore.QPoint.operator- ( QPoint  arg1 )

static

This is an overloaded function.

Returns a QPoint object that is formed by changing the sign of both components of the given point.

Equivalent to QPoint(0,0) - point.

static QPoint QtCore.QPoint.operator- ( QPoint  arg1, QPoint  arg2  )

static

Returns a QPoint object that is formed by subtracting p2 from p1; each component is subtracted separately.

See also QPoint::operator-=().

static QPoint QtCore.QPoint.operator/ ( QPoint  arg1, double  arg2  )

static

Returns the QPoint formed by dividing both components of the given point by the given divisor.

Note that the result is rounded to the nearest integer as points are held as integers. Use QPointF for floating point accuracy.

See also QPoint::operator/=().

static bool QtCore.QPoint.operator== ( QPoint  arg1, QPoint  arg2  )

static

new int QtCore.QPoint.Rx

(

)

Returns a reference to the x coordinate of this point.

Using a reference makes it possible to directly manipulate x. For example:

QPoint p(1, 2);

p.rx()–; // p becomes (0, 2)

See also x() and setX().

new int QtCore.QPoint.Ry

(

)

Returns a reference to the y coordinate of this point.

Using a reference makes it possible to directly manipulate y. For example:

QPoint p(1, 2);

p.ry()++; // p becomes (1, 3)

See also y() and setY().

Member Data Documentation

SmokeInvocation QtCore.QPoint.interceptor

protected

Property Documentation

virtual System.IntPtr QtCore.QPoint.SmokeObject

getset

new int QtCore.QPoint.X

getset

Returns the x coordinate of this point.

Sets the x coordinate of this point to the given x coordinate.

new int QtCore.QPoint.Y

getset

Returns the y coordinate of this point.

Sets the y coordinate of this point to the given y coordinate.