QPoint ¶

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

概要 ¶

函数 ¶

def __add__ ()
def __add__ (, p2)
def __div__ (, c)
def __eq__ (, p2)
def __iadd__ (p)
def __idiv__ (divisor)
def __imul__ (factor)
def __imul__ (factor)
def __imul__ (factor)
def __isub__ (p)
def __mul__ (, factor)
def __mul__ (, factor)
def __mul__ (, factor)
def __mul__ (, m)
def __mul__ (, m)
def __mul__ (, matrix)
def __mul__ (factor)
def __mul__ (factor)
def __mul__ (factor)
def __mul__ (matrix)
def __ne__ (, p2)
def __reduce__ ()
def __repr__ ()
def __sub__ ()
def __sub__ (, p2)
def isNull ()
def manhattanLength ()
def setX (x)
def setY (y)
def toTuple ()
def transposed ()
def x ()
def y ()

静态函数 ¶

def dotProduct (p1, p2)

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 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:
p = QPoint()
p.setX(p.x() + 1)
p += QPoint(1, 0)
											
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 或 qreal .

此外， 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.

另请参阅

QPointF QPolygon

class QPoint ¶

QPoint(QPoint)

QPoint(xpos, ypos)

param QPoint

QPoint

param ypos

int

param xpos

int

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

另请参阅

isNull()

构造点采用给定坐标 ( xpos , ypos ).

另请参阅

setX() setY()

PySide2.QtCore.QPoint. __reduce__ ( ) ¶

返回类型: PyObject

PySide2.QtCore.QPoint. __repr__ ( ) ¶

返回类型: PyObject

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

参数

p1 – QPoint
p2 – QPoint

返回类型

int

											QPoint p( 3, 7);
QPoint q(-1, 4);
int lengthSquared = QPoint::dotProduct(p, q);   // lengthSquared becomes 25
											
										

Returns the dot product of p1 and p2 .

PySide2.QtCore.QPoint. isNull ( ) ¶

返回类型: bool

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

PySide2.QtCore.QPoint. manhattanLength ( ) ¶

返回类型: int

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:

											class MyWidget(QWidget):
    self.oldPosition = QPointer()
    # event : QMouseEvent
    def mouseMoveEvent(QMouseEvent event):
        point = event.pos() - self.oldPosition
        if (point.manhattanLength() > 3):
            # the mouse has moved more than 3 pixels since the oldPosition
            pass
											
										

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

											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.

PySide2.QtCore.QPoint. __ne__ ( p2 ) ¶

参数: p2 – QPoint
返回类型: bool

PySide2.QtCore.QPoint. __mul__ ( matrix ) ¶

参数: matrix – QMatrix4x4
返回类型: QPoint