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QPoint Class Reference
[com.trolltech.qt.core module]

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


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.


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Qt Jambi 4.3.5_01