The QRadialGradient class is used in combination with QBrush 以指定径向渐变笔刷。 更多...
| 头： | #include <QRadialGradient> |
| qmake: | QT += gui |
| 继承： | QGradient |
| QRadialGradient () | |
| QRadialGradient (const QPointF & center , qreal radius , const QPointF & focalPoint ) | |
| QRadialGradient (qreal cx , qreal cy , qreal radius , qreal fx , qreal fy ) | |
| QRadialGradient (const QPointF & center , qreal radius ) | |
| QRadialGradient (qreal cx , qreal cy , qreal radius ) | |
| QRadialGradient (const QPointF & center , qreal centerRadius , const QPointF & focalPoint , qreal focalRadius ) | |
| QRadialGradient (qreal cx , qreal cy , qreal centerRadius , qreal fx , qreal fy , qreal focalRadius ) | |
| QPointF | center () const |
| qreal | centerRadius () const |
| QPointF | focalPoint () const |
| qreal | focalRadius () const |
| qreal | radius () const |
| void | setCenter (const QPointF & center ) |
| void | setCenter (qreal x , qreal y ) |
| void | setCenterRadius (qreal radius ) |
| void | setFocalPoint (const QPointF & focalPoint ) |
| void | setFocalPoint (qreal x , qreal y ) |
| void | setFocalRadius (qreal radius ) |
| void | setRadius (qreal radius ) |
The QRadialGradient class is used in combination with QBrush 以指定径向渐变笔刷。
Qt supports both simple and extended radial gradients.
Simple radial gradients interpolate colors between a focal point and end points on a circle surrounding it. Extended radial gradients interpolate colors between a focal circle and a center circle. Points outside the cone defined by the two circles will be transparent. For simple radial gradients the focal point is adjusted to lie inside the center circle, whereas the focal point can have any position in an extended radial gradient.
Outside the end points the gradient is either padded, reflected or repeated depending on the currently set spread 方法：
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| PadSpread (默认) | 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 () 或 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 ， QRadialGradient 类提供 center (), focalPoint () 和 radius () functions returning the gradient's center, focal point and radius respectively.
另请参阅 QLinearGradient , QConicalGradient ，和 The Gradients Example .
Constructs a simple radial gradient with the center and focal point at (0, 0) with a radius of 1.
Constructs a simple radial gradient with the given center , radius and focalPoint .
注意： If the given focal point is outside the circle defined by the center point and radius , it will be re-adjusted to lie at a point on the circle where it intersects with the line from center to focalPoint .
另请参阅 QGradient::setColorAt () 和 QGradient::setStops ().
Constructs a simple radial gradient with the given center ( cx , cy ), radius and focal point ( fx , fy ).
注意： If the given focal point is outside the circle defined by the center ( cx , cy ) and the radius it will be re-adjusted to the intersection between the line from the center to the focal point and the circle.
另请参阅 QGradient::setColorAt () 和 QGradient::setStops ().
Constructs a simple radial gradient with the given center , radius and the focal point in the circle center.
另请参阅 QGradient::setColorAt () 和 QGradient::setStops ().
Constructs a simple radial gradient with the center at ( cx , cy ) and the specified radius . The focal point lies at the center of the circle.
另请参阅 QGradient::setColorAt () 和 QGradient::setStops ().
Constructs an extended radial gradient with the given center , centerRadius , focalPoint ，和 focalRadius .
该函数在 Qt 4.8 引入。
Constructs an extended radial gradient with the given center ( cx , cy ), center radius, centerRadius , focal point, ( fx , fy ), and focal radius focalRadius .
该函数在 Qt 4.8 引入。
Returns the center of this radial gradient in logical coordinates.
另请参阅 setCenter () 和 QGradient::stops ().
Returns the center radius of this radial gradient in logical coordinates.
该函数在 Qt 4.8 引入。
另请参阅 setCenterRadius () 和 QGradient::stops ().
Returns the focal point of this radial gradient in logical coordinates.
另请参阅 setFocalPoint () 和 QGradient::stops ().
Returns the focal radius of this radial gradient in logical coordinates.
该函数在 Qt 4.8 引入。
另请参阅 setFocalRadius () 和 QGradient::stops ().
Returns the radius of this radial gradient in logical coordinates.
相当于 centerRadius ()
另请参阅 setRadius () 和 QGradient::stops ().
Sets the center of this radial gradient in logical coordinates to center .
该函数在 Qt 4.2 引入。
另请参阅 center ().
这是重载函数。
Sets the center of this radial gradient in logical coordinates to ( x , y ).
该函数在 Qt 4.2 引入。
另请参阅 center ().
Sets the center radius of this radial gradient in logical coordinates to radius
该函数在 Qt 4.8 引入。
另请参阅 centerRadius ().
Sets the focal point of this radial gradient in logical coordinates to focalPoint .
该函数在 Qt 4.2 引入。
另请参阅 focalPoint ().
这是重载函数。
Sets the focal point of this radial gradient in logical coordinates to ( x , y ).
该函数在 Qt 4.2 引入。
另请参阅 focalPoint ().
Sets the focal radius of this radial gradient in logical coordinates to radius
该函数在 Qt 4.8 引入。
另请参阅 focalRadius ().
Sets the radius of this radial gradient in logical coordinates to radius
相当于 setCenterRadius ()
该函数在 Qt 4.2 引入。
另请参阅 radius ().
