QConicalGradient ¶

概要 ¶

详细描述 ¶

PySide.QtGui.QConicalGradient class is used in combination with PySide.QtGui.QBrush 以指定锥形渐变笔刷。

Conical gradients interpolate interpolate colors counter-clockwise around a center point.

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 PySide.QtGui.QGradient ， PySide.QtGui.QConicalGradient class provides the PySide.QtGui.QConicalGradient.angle() and PySide.QtGui.QConicalGradient.center() functions returning the start angle and center of the gradient.

注意： PySide.QtGui.QGradient.setSpread() function has no effect for conical gradients. The reason is that the conical gradient is closed by definition, i.e. the conical gradient fills the entire circle from 0 - 360 degrees, while the boundary of a radial or a linear gradient can be specified through its radius or final stop points, respectively.

另请参阅

PySide.QtGui.QLinearGradient PySide.QtGui.QRadialGradient The Gradients Demo

class PySide.QtGui. QConicalGradient ¶

class PySide.QtGui. QConicalGradient ( QConicalGradient )

class PySide.QtGui. QConicalGradient ( center , startAngle )

class PySide.QtGui. QConicalGradient ( cx , cy , startAngle )

参数：	center – PySide.QtCore.QPointF cx – PySide.QtCore.qreal cy – PySide.QtCore.qreal startAngle – PySide.QtCore.qreal QConicalGradient – PySide.QtGui.QConicalGradient

Constructs a conical with center at (0, 0) starting the interpolation at angle 0.

另请参阅

QGradient.setColorAt() PySide.QtGui.QConicalGradient.setCenter() PySide.QtGui.QConicalGradient.setAngle()

Constructs a conical gradient with the given center , starting the interpolation at the given angle 。 angle must be specified in degrees between 0 and 360.

另请参阅

QGradient.setColorAt() QGradient.setStops()

Constructs a conical gradient with the given center ( cx , cy ), starting the interpolation at the given angle . The angle must be specified in degrees between 0 and 360.

另请参阅

QGradient.setColorAt() QGradient.setStops()

PySide.QtGui.QConicalGradient. angle ( ) ¶

返回类型：	PySide.QtCore.qreal

Returns the start angle of the conical gradient in logical coordinates.

另请参阅

PySide.QtGui.QConicalGradient.setAngle() PySide.QtGui.QGradient.stops()

PySide.QtGui.QConicalGradient. center ( ) ¶

返回类型：	PySide.QtCore.QPointF

Returns the center of the conical gradient in logical coordinates.

另请参阅

PySide.QtGui.QConicalGradient.setCenter() PySide.QtGui.QGradient.stops()

PySide.QtGui.QConicalGradient. setAngle ( angle ) ¶

参数：	angle – PySide.QtCore.qreal

集 angle to be the start angle for this conical gradient in logical coordinates.

另请参阅

PySide.QtGui.QConicalGradient.angle()

PySide.QtGui.QConicalGradient. setCenter ( center ) ¶

参数：	center – PySide.QtCore.QPointF

Sets the center of this conical gradient in logical coordinates to center .

另请参阅

PySide.QtGui.QConicalGradient.center()

PySide.QtGui.QConicalGradient. setCenter ( x , y )

参数：	x – PySide.QtCore.qreal y – PySide.QtCore.qreal

这是重载函数。

Sets the center of this conical gradient in logical coordinates to ( x , y ).

另请参阅

PySide.QtGui.QConicalGradient.center()