QLinearGradient 类

QLinearGradient 类用于组合 QBrush 以指定线性渐变笔刷。更多...

头：	#include <QLinearGradient>
qmake:	QT += gui
继承：	QGradient

所有成员列表，包括继承成员

公共函数

	QLinearGradient (qreal x1 , qreal y1 , qreal x2 , qreal y2 )
	QLinearGradient (const QPointF & start , const QPointF & finalStop )
	QLinearGradient ()
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

详细描述

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 方法：


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 , 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.

另请参阅 QRadialGradient , QConicalGradient ，和 The Gradients Example .

成员函数文档编制

QLinearGradient:: QLinearGradient ( qreal x1 , qreal y1 , qreal x2 , qreal y2 )

Constructs a linear gradient with interpolation area between ( x1 , y1 ) 和 ( x2 , y2 ).

注意： The expected parameter values are in pixels.

另请参阅 QGradient::setColorAt () 和 QGradient::setStops ().

QLinearGradient:: QLinearGradient (const QPointF & start , const QPointF & finalStop )

Constructs a linear gradient with interpolation area between the given start point and finalStop .

注意： The expected parameter values are in pixels.

另请参阅 QGradient::setColorAt () 和 QGradient::setStops ().

QLinearGradient:: QLinearGradient ()

Constructs a default linear gradient with interpolation area between (0, 0) and (1, 1).

另请参阅 QGradient::setColorAt (), setStart ()，和 setFinalStop ().

QPointF QLinearGradient:: finalStop () const

Returns the final stop point of this linear gradient in logical coordinates.

另请参阅 setFinalStop () 和 QGradient::stops ().

void QLinearGradient:: setFinalStop (const QPointF & stop )

Sets the final stop point of this linear gradient in logical coordinates to stop .

该函数在 Qt 4.2 引入。

另请参阅 finalStop ().

void QLinearGradient:: setFinalStop ( qreal x , qreal y )

这是重载函数。

Sets the final stop point of this linear gradient in logical coordinates to x , y .

该函数在 Qt 4.2 引入。

另请参阅 start ().

void QLinearGradient:: setStart (const QPointF & start )

Sets the start point of this linear gradient in logical coordinates to start .

该函数在 Qt 4.2 引入。

另请参阅 start ().

void QLinearGradient:: setStart ( qreal x , qreal y )

这是重载函数。

Sets the start point of this linear gradient in logical coordinates to x , y .

该函数在 Qt 4.2 引入。

另请参阅 start ().

QPointF QLinearGradient:: start () const

Returns the start point of this linear gradient in logical coordinates.

另请参阅 setStart () 和 QGradient::stops ().