QLinearGradient Class
The QLinearGradient class is used in combination with QBrush to specify a linear gradient brush. 更多...
| 头文件: | #include <QLinearGradient> |
| qmake: | QT += gui |
| 基类: | QGradient |
公有函数
| QLinearGradient() | |
| QLinearGradient(const QPointF &start, const QPointF &finalStop) | |
| QLinearGradient(qreal x1, qreal y1, qreal x2, qreal y2) | |
| QPointF | finalStop() const |
| void | setFinalStop(const QPointF &stop) |
| void | setFinalStop(qreal x, qreal y) |
| void | setStart(const QPointF &start) |
| void | setStart(qreal x, qreal y) |
| QPointF | start() const |
- 10 个公有函数继承自 QGradient
详细描述
The QLinearGradient class is used in combination with QBrush to specify a linear gradient brush.
Linear gradients interpolate colors between start and end points. Outside these 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 QLinearGradient class provides the finalStop() function which returns the final stop point of the gradient, and the start() function returning the start point of the gradient.
参见 QRadialGradient, QConicalGradient, and The Gradients Example.
成员函数
QLinearGradient::QLinearGradient()
Constructs a default linear gradient with interpolation area between (0, 0) and (1, 1).
参见 QGradient::setColorAt(), setStart(), and setFinalStop().
QLinearGradient::QLinearGradient(const QPointF &start, const QPointF &finalStop)
Constructs a linear gradient with interpolation area between the given start point and finalStop.
Note: The expected parameter values are in pixels.
参见 QGradient::setColorAt() and QGradient::setStops().
QLinearGradient::QLinearGradient(qreal x1, qreal y1, qreal x2, qreal y2)
Constructs a linear gradient with interpolation area between (x1, y1) and (x2, y2).
Note: The expected parameter values are in pixels.
参见 QGradient::setColorAt() and QGradient::setStops().
QPointF QLinearGradient::finalStop() const
Returns the final stop point of this linear gradient in logical coordinates.
参见 setFinalStop() and QGradient::stops().
void QLinearGradient::setFinalStop(const QPointF &stop)
Sets the final stop point of this linear gradient in logical coordinates to stop.
This function was introduced in Qt 4.2.
参见 finalStop().
void QLinearGradient::setFinalStop(qreal x, qreal y)
This is an overloaded function.
Sets the final stop point of this linear gradient in logical coordinates to x, y.
This function was introduced in Qt 4.2.
参见 start().
void QLinearGradient::setStart(const QPointF &start)
Sets the start point of this linear gradient in logical coordinates to start.
This function was introduced in Qt 4.2.
参见 start().
void QLinearGradient::setStart(qreal x, qreal y)
This is an overloaded function.
Sets the start point of this linear gradient in logical coordinates to x, y.
This function was introduced in Qt 4.2.
参见 start().
QPointF QLinearGradient::start() const
Returns the start point of this linear gradient in logical coordinates.
参见 setStart() and QGradient::stops().