QPointF ¶

概要 ¶

详细描述 ¶

A point is specified by a x coordinate and an y coordinate which can be accessed using the x() and y() functions. The coordinates of the point are specified using floating point numbers for accuracy. The isNull() function returns true if both x and y are set to 0.0. 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:

p = QPointF()
p.setX(p.x() + 1.0)
p += QPointF(1.0, 0.0)
#p.rx()++;
											

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

此外， QPointF class provides a constructor converting a QPoint object into a QPointF object, and a corresponding toPoint() function which returns a QPoint copy of this point. Finally, QPointF objects can be streamed as well as compared.

另请参阅

QPoint QPolygonF

class QPointF ¶

QPointF(p)

QPointF(QPointF)

QPointF(xpos, ypos)

param ypos

qreal

param p

QPoint

param xpos

qreal

param QPointF

QPointF

构造 null 点，即具有坐标 (0.0, 0.0)

另请参阅

isNull()

构造副本为给定 point .

另请参阅

toPoint()

构造点采用给定坐标 ( xpos , ypos ).

另请参阅

setX() setY()

PySide2.QtCore.QPointF. __reduce__ ( ) ¶

返回类型

PyObject

PySide2.QtCore.QPointF. __repr__ ( ) ¶

返回类型

PyObject

static PySide2.QtCore.QPointF. dotProduct ( p1 , p2 ) ¶

参数

• p1 – QPointF

• p2 – QPointF

返回类型

qreal

QPointF p( 3.1, 7.1);
QPointF q(-1.0, 4.1);
int lengthSquared = QPointF::dotProduct(p, q);   // lengthSquared becomes 26.01
											

Returns the dot product of p1 and p2 .

PySide2.QtCore.QPointF. isNull ( ) ¶

返回类型

bool

返回 true if both the x and y coordinates are set to 0.0 (ignoring the sign); otherwise returns false .

PySide2.QtCore.QPointF. manhattanLength ( ) ¶

返回类型

qreal

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.

另请参阅

manhattanLength()

PySide2.QtCore.QPointF. __ne__ ( p2 ) ¶

参数

p2 – QPointF

返回类型

bool

PySide2.QtCore.QPointF. __mul__ ( m ) ¶

参数

m – QMatrix

返回类型

QPointF

PySide2.QtCore.QPointF. __mul__ ( matrix ) ¶

参数

matrix – QMatrix4x4

返回类型

QPointF

PySide2.QtCore.QPointF. __mul__ ( matrix ) ¶

参数

matrix – QMatrix4x4

返回类型

QPointF

PySide2.QtCore.QPointF. __mul__ ( m ) ¶

参数

m – QTransform

返回类型

QPointF

PySide2.QtCore.QPointF. __mul__ ( c ) ¶

参数

c – qreal

返回类型

QPointF

PySide2.QtCore.QPointF. __mul__ ( c ) ¶

参数

c – qreal

返回类型

QPointF

PySide2.QtCore.QPointF. __imul__ ( c ) ¶

参数

c – qreal

返回类型

QPointF

Multiplies this point’s coordinates by the given factor , and returns a reference to this point. For example:

p = QPointF(-1.1, 4.1)
p *= 2.5  # p becomes (-2.75, 10.25)
											

另请参阅

operator/=()

PySide2.QtCore.QPointF. __add__ ( ) ¶

返回类型

QPointF

PySide2.QtCore.QPointF. __add__ ( p2 ) ¶

参数

p2 – QPointF

返回类型

QPointF

PySide2.QtCore.QPointF. __iadd__ ( p ) ¶

参数

p – QPointF

返回类型

QPointF

添加给定 point to this point and returns a reference to this point. For example:

p = QPointF( 3.1, 7.1)
q = QPointF(-1.0, 4.1)
p += q    # p becomes (2.1, 11.2)
											

另请参阅

operator-=()

PySide2.QtCore.QPointF. __sub__ ( ) ¶

返回类型

QPointF

PySide2.QtCore.QPointF. __sub__ ( p2 ) ¶

参数

p2 – QPointF

返回类型

QPointF

PySide2.QtCore.QPointF. __isub__ ( p ) ¶

参数

p – QPointF

返回类型

QPointF

Subtracts the given point from this point and returns a reference to this point. For example:

p = QPointF( 3.1, 7.1)
q = QPointF(-1.0, 4.1)
p -= q    # p becomes (4.1, 3.0)
											

另请参阅

operator+=()

PySide2.QtCore.QPointF. __div__ ( divisor ) ¶

参数

divisor – qreal

返回类型

QPointF

PySide2.QtCore.QPointF. __idiv__ ( c ) ¶

参数

c – qreal

返回类型

QPointF

Divides both x and y by the given divisor , and returns a reference to this point. For example:

p = QPointF(-2.75, 10.25)
p /= 2.5  # p becomes (-1.1, 4.1)
											

另请参阅

operator*=()

PySide2.QtCore.QPointF. __eq__ ( p2 ) ¶

参数

p2 – QPointF

返回类型

bool

PySide2.QtCore.QPointF. setX ( x ) ¶

参数

x – qreal

Sets the x coordinate of this point to the given x 坐标。

另请参阅

x() setY()

PySide2.QtCore.QPointF. setY ( y ) ¶

参数

y – qreal

Sets the y coordinate of this point to the given y 坐标。

另请参阅

y() setX()

PySide2.QtCore.QPointF. toPoint ( ) ¶

返回类型

QPoint

Rounds the coordinates of this point to the nearest integer, and returns a QPoint object with the rounded coordinates.

另请参阅

QPointF()

PySide2.QtCore.QPointF. toTuple ( ) ¶

返回类型

PyObject

PySide2.QtCore.QPointF. transposed ( ) ¶

返回类型

QPointF

Returns a point with x and y coordinates exchanged:

QPointF{1.0, 2.0}.transposed() // {2.0, 1.0}
											

另请参阅

x() y() setX() setY()

PySide2.QtCore.QPointF. x ( ) ¶

返回类型

qreal

返回此点的 x 坐标。

另请参阅

setX() rx()

PySide2.QtCore.QPointF. y ( ) ¶

返回类型

qreal

返回此点的 y 坐标。

另请参阅

setY() ry()