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# QPointF Class Reference
[QtCore module]

The QPointF class defines a point in the plane using floating point precision. More...

### Methods

- __init__ (self)
- __init__ (self, QPainterPath.Element)
- __init__ (self, float, float)
- __init__ (self, QPoint)
- __init__ (self, QPointF)
- bool isNull (self)
- float manhattanLength (self)
- setX (self, float)
- setY (self, float)
- QPoint toPoint (self)
- float x (self)
- float y (self)

### Special Methods

- QPointF __mul__ (self, QMatrix)
- QPointF __mul__ (self, QMatrix4x4)
- QPointF __mul__ (self, QTransform)
- QPointF __add__ (self, QPointF)
- int __bool__ (self)
- QPointF __div__ (self, float)
- bool __eq__ (self, QPointF)
- QPointF __iadd__ (self, QPointF)
- QPointF __idiv__ (self, float)
- QPointF __imul__ (self, float)
- QPointF __isub__ (self, QPointF)
- QPointF __mul__ (self, float)
- bool __ne__ (self, QPointF)
- QPointF __neg__ (self, QPointF)
- str __repr__ (self)
- QPointF __sub__ (self, QPointF)

## Detailed Description

This class can be pickled.

The QPointF class defines a point in the plane using floating point precision.

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:

     QPointF p;

     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` or a `qreal`.

In addition, the 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.

See also QPoint and QPolygonF.

## Method Documentation

### QPointF.__init__ (self)

Constructs a null point, i.e. with coordinates (0.0, 0.0)

See also isNull().

### QPointF.__init__ (self, QPainterPath.Element)

This method is only available if the QtGui module is imported.

Constructs a null point, i.e. with coordinates (0.0, 0.0)

See also isNull().

### QPointF.__init__ (self, float, float)

Constructs a copy of the given point.

See also toPoint().

### QPointF.__init__ (self, QPoint)

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

See also setX() and setY().

### QPointF.__init__ (self, QPointF)

### bool QPointF.isNull (self)

Returns true if both the x and y coordinates are set to 0.0, otherwise returns false.

### float QPointF.manhattanLength (self)

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.

This function was introduced in Qt 4.6.

See also QPoint.manhattanLength().

### QPointF.setX (self, float)

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

See also x() and setY().

### QPointF.setY (self, float)

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

See also y() and setX().

### QPoint QPointF.toPoint (self)

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

See also QPointF().

### float QPointF.x (self)

Returns the x-coordinate of this point.

See also setX() and rx().

### float QPointF.y (self)

Returns the y-coordinate of this point.

See also setY() and ry().

### QPointF __mul__ (self, QMatrix)

This method is only available if the QtGui module is imported.

### QPointF __mul__ (self, QMatrix4x4)

This method is only available if the QtGui module is imported.

### QPointF __mul__ (self, QTransform)

This method is only available if the QtGui module is imported.

### QPointF QPointF.__add__ (self, QPointF)

### int QPointF.__bool__ (self)

### QPointF QPointF.__div__ (self, float)

### bool QPointF.__eq__ (self, QPointF)

### QPointF QPointF.__iadd__ (self, QPointF)

### QPointF QPointF.__idiv__ (self, float)

### QPointF QPointF.__imul__ (self, float)

### QPointF QPointF.__isub__ (self, QPointF)

### QPointF QPointF.__mul__ (self, float)

### bool QPointF.__ne__ (self, QPointF)

### QPointF QPointF.__neg__ (self, QPointF)

### str QPointF.__repr__ (self)

### QPointF QPointF.__sub__ (self, QPointF)