QRadialGradient Class Reference
^{[QtGui module]}

Detailed Description

The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush.

Radial gradients interpolate colors between a focal point and end points on a circle surrounding it. Outside the end points the gradient is either padded, reflected or repeated depending on the currently set spread method:

PadSpread (default)	ReflectSpread	RepeatSpread

The colors in a gradient is defined using stop points of the QGradientStop type, i.e. a position and a color. Use the QGradient::setColorAt() or the QGradient::setStops() function to define the stop points. It is the gradient's complete set of stop points that describes how the gradient area should be filled. If no stop points have been specified, a gradient of black at 0 to white at 1 is used.

In addition to the functions inherited from QGradient, the QRadialGradient class provides the center(), focalPoint() and radius() functions returning the gradient's center, focal point and radius respectively.

See also QLinearGradient, QConicalGradient, and The Gradients Demo.

Member Function Documentation

QRadialGradient::QRadialGradient ( const QPointF & center, qreal radius, const QPointF & focalPoint = QPointF() )

Constructs a radial gradient with the given center, radius and focalPoint.

The default focalPoint is the circle center. If the focalPoint is outside the circle defined by the given center and radius, it is clamped to the circle's boundary.

See also QGradient::setColorAt() and QGradient::setStops().

QRadialGradient::QRadialGradient ( qreal cx, qreal cy, qreal radius, qreal fx = 0, qreal fy = 0 )

Constructs a radial gradient with the given center (cx, cy), radius and focal point (fx, fy).

The default focal point is the circle center. If the focal point is outside the circle defined by the given center and radius, it is clamped to the circle's boundary.

See also QGradient::setColorAt() and QGradient::setStops().

QPointF QRadialGradient::center () const

Returns the center of this radial gradient in logical coordinates.

See also QGradient::stops().

QPointF QRadialGradient::focalPoint () const

Returns the focal point of this radial gradient in logical coordinates.

See also QGradient::stops().

qreal QRadialGradient::radius () const

Returns the radius of the radial gradient in logical coordinates.

See also QGradient::stops().