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The QGradient class is used in combination with QBrush to specify gradient fills. More...
#include <QGradient>
Part of the QtGui module.
Inherited by QConicalGradient, QLinearGradient, and QRadialGradient.
The QGradient class is used in combination with QBrush to specify gradient fills.
Qt currently supports three types of gradient fills: linear, radial and conical. Each of these is represented by a subclass of QGradient: QLinearGradient, QRadialGradient and QConicalGradient.
The colors in a gradient is defined using stop points, which is a position and a color. The set of stop points describes how the gradient area should be filled. A diagonal linear gradient from black at (100, 100) to white at (200, 200) could be specified like this:
QLinearGradient grad(QPointF(100, 100), QPointF(200, 200)); grad.appendStop(0, Qt::black); grad.appendStop(1, Qt::white);
A gradient can have an arbitrary number of stop points. The following gradient would create a radial gradient starting with red in the center, blue and then green on the edges:
QRadialGradient grad(QPointF(100, 100), 100); grad.appendStop(0, Qt::red); grad.appendStop(0.5, Qt::blue); grad.appendStop(1, Qt::green);
It is possible to repeat or reflect the gradient outside the area by specifiying spread. The default is to pad the outside area with the color at the closest stop point.
See also QLinearGradient, QRadialGradient, and QConicalGradient.
Specifies how the areas outside the gradient area should be filled.
Constant | Value | Description |
---|---|---|
QGradient::PadSpread | 0 | The areas are filled with the closes stop color. This is the default. |
QGradient::RepeatSpread | 2 | The gradient repeats outside the gradient area. |
QGradient::ReflectSpread | 1 | The gradient is reflected outside the gradient area. |
Specifies the type of gradient.
Constant | Value | Description |
---|---|---|
QGradient::LinearGradient | 0 | The gradient is a linear gradient. |
QGradient::RadialGradient | 1 | The gradient is a radial gradient. |
QGradient::ConicalGradient | 2 | The gradient is a conical gradient. |
Appends the stop point stop to the gradient.. The position of stop must be in the range 0 to 1 and must be added in increasing order.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Appends another stop point at the relative position pos with color color. The position pos must be in the range 0 to 1 and must be added in increasing order.
Specifies the spread method that should be used for this gradient. This function only has effect for linear and radial gradients.
Replaces the current set of stop points with stops. The positions of the stop points must in the range 0 to 1 and must be sorted with the lowest point first.
Returns the spread method use by this gradient. The default is Pad
Returns the stops for this gradient.
If no stops have been spesified a gradient of black at 0 to white at 1 is used.
Returns the type of gradient.
Copyright © 2005 Trolltech | Trademarks | Qt 4.0.0-b2 |