QRadialGradient ¶

QRadialGradient class is used in combination with QBrush 以指定径向渐变笔刷。更多 …

概要 ¶

函数 ¶

def center ()
def centerRadius ()
def focalPoint ()
def focalRadius ()
def radius ()
def setCenter (center)
def setCenter (x, y)
def setCenterRadius (radius)
def setFocalPoint (focalPoint)
def setFocalPoint (x, y)
def setFocalRadius (radius)
def setRadius (radius)

详细描述 ¶

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：

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 setColorAt() 或 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 class provides the center() , focalPoint() and radius() functions returning the gradient’s center, focal point and radius respectively.

另请参阅

QLinearGradient QConicalGradient The Gradients Example

class QRadialGradient ¶

QRadialGradient(center, centerRadius, focalPoint, focalRadius)

QRadialGradient(center, radius)

QRadialGradient(center, radius, focalPoint)

QRadialGradient(QRadialGradient)

QRadialGradient(cx, cy, centerRadius, fx, fy, focalRadius)

QRadialGradient(cx, cy, radius)

QRadialGradient(cx, cy, radius, fx, fy)

param QRadialGradient

QRadialGradient

param fx

qreal

param fy

qreal

param focalPoint

QPointF

param radius

qreal

param cx

qreal

param cy

qreal

param center

QPointF

param focalRadius

qreal

param centerRadius

qreal

Constructs a simple radial gradient with the center and focal point at (0, 0) with a radius of 1.

Constructs an extended radial gradient with the given center , centerRadius , focalPoint ，和 focalRadius .

Constructs a simple radial gradient with the given center , radius and the focal point in the circle center.

另请参阅

setColorAt() setStops()

Constructs an extended radial gradient with the given center ( cx , cy ), center radius, centerRadius , focal point, ( fx , fy ), and focal radius focalRadius .

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

setColorAt() 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

setColorAt() setStops()

PySide2.QtGui.QRadialGradient. center ( ) ¶