內容

• 公共函數
• 詳細描述

QLinearGradient 類

The QLinearGradient class is used in combination with QBrush 以指定綫性漸變筆刷。 更多...

頭：	#include <QLinearGradient>
qmake:	QT += gui
繼承：	QGradient

• 所有成員列錶，包括繼承成員

公共函數

	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 公共函數繼承自 QGradient

詳細描述

The QLinearGradient class is used in combination with QBrush 以指定綫性漸變筆刷。

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 (默認)	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 ， QLinearGradient 類提供 finalStop () function which returns the final stop point of the gradient, and the start () function returning the start point of the gradient.

另請參閱 QRadialGradient , QConicalGradient ，和 The Gradients Example .

成員函數文檔編製

QLinearGradient:: QLinearGradient ()

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

另請參閱 QGradient::setColorAt (), setStart ()，和 setFinalStop ().

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.

另請參閱 QGradient::setColorAt () 和 QGradient::setStops ().

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.

另請參閱 QGradient::setColorAt () 和 QGradient::setStops ().

QPointF QLinearGradient:: finalStop () const

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

另請參閱 setFinalStop () 和 QGradient::stops ().

void QLinearGradient:: setFinalStop (const QPointF & stop )

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

該函數在 Qt 4.2 引入。

另請參閱 finalStop ().

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

這是重載函數。

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

該函數在 Qt 4.2 引入。

另請參閱 start ().

void QLinearGradient:: setStart (const QPointF & start )

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

該函數在 Qt 4.2 引入。

另請參閱 start ().

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

這是重載函數。

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

該函數在 Qt 4.2 引入。

另請參閱 start ().

QPointF QLinearGradient:: start () const

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

另請參閱 setStart () 和 QGradient::stops ().