|  | Home · All Classes · Modules

# QRadialGradient Class Reference
[QtGui module]

The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush. More...

Inherits QGradient.

### Methods

- __init__ (self)
- __init__ (self, QPointF center, float radius, QPointF focalPoint)
- __init__ (self, QPointF center, float centerRadius, QPointF focalPoint, float focalRadius)
- __init__ (self, QPointF center, float radius)
- __init__ (self, float cx, float cy, float radius, float fx, float fy)
- __init__ (self, float cx, float cy, float centerRadius, float fx, float fy, float focalRadius)
- __init__ (self, float cx, float cy, float radius)
- __init__ (self, QRadialGradient)
- QPointF center (self)
- float centerRadius (self)
- QPointF focalPoint (self)
- float focalRadius (self)
- float radius (self)
- setCenter (self, QPointF center)
- setCenter (self, float x, float y)
- setCenterRadius (self, float radius)
- setFocalPoint (self, QPointF focalPoint)
- setFocalPoint (self, float x, float y)
- setFocalRadius (self, float radius)
- setRadius (self, float radius)

## Detailed Description

The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush.

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 method:

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 QGradient.setColorAt() or the 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 QRadialGradient class provides the center(), focalPoint() and radius() functions returning the gradient's center, focal point and radius respectively.

## Method Documentation

### QRadialGradient.__init__ (self)

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

### QRadialGradient.__init__ (self, QPointF center, float radius, QPointF focalPoint)

Constructs a simple radial gradient with the given center, radius and focalPoint.

Note: 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.

See also QGradient.setColorAt() and QGradient.setStops().

### QRadialGradient.__init__ (self, QPointF center, float centerRadius, QPointF focalPoint, float focalRadius)

Constructs a simple radial gradient with the given center (cx, cy), radius and focal point (fx, fy).

Note: 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.

See also QGradient.setColorAt() and QGradient.setStops().

### QRadialGradient.__init__ (self, QPointF center, float radius)

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

See also QGradient.setColorAt() and QGradient.setStops().

### QRadialGradient.__init__ (self, float cx, float cy, float radius, float fx, float fy)

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.

See also QGradient.setColorAt() and QGradient.setStops().

### QRadialGradient.__init__ (self, float cx, float cy, float centerRadius, float fx, float fy, float focalRadius)

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

This function was introduced in Qt 4.8.

### QRadialGradient.__init__ (self, float cx, float cy, float radius)

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

This function was introduced in Qt 4.8.

### QRadialGradient.__init__ (self, QRadialGradient)

### QPointF QRadialGradient.center (self)

Returns the center of this radial gradient in logical coordinates.

See also setCenter() and QGradient.stops().

### float QRadialGradient.centerRadius (self)

Returns the center radius of this radial gradient in logical coordinates.

This function was introduced in Qt 4.8.

See also setCenterRadius() and QGradient.stops().

### QPointF QRadialGradient.focalPoint (self)

Returns the focal point of this radial gradient in logical coordinates.

See also setFocalPoint() and QGradient.stops().

### float QRadialGradient.focalRadius (self)

Returns the focal radius of this radial gradient in logical coordinates.

This function was introduced in Qt 4.8.

See also setFocalRadius() and QGradient.stops().

### float QRadialGradient.radius (self)

Returns the radius of this radial gradient in logical coordinates.

Equivalent to centerRadius()

See also setRadius() and QGradient.stops().

### QRadialGradient.setCenter (self, QPointF center)

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

This function was introduced in Qt 4.2.

See also center().

### QRadialGradient.setCenter (self, float x, float y)

This is an overloaded function.

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

This function was introduced in Qt 4.2.

See also center().

### QRadialGradient.setCenterRadius (self, float radius)

Sets the center radius of this radial gradient in logical coordinates to radius

This function was introduced in Qt 4.8.

See also centerRadius().

### QRadialGradient.setFocalPoint (self, QPointF focalPoint)

Sets the focal point of this radial gradient in logical coordinates to focalPoint.

This function was introduced in Qt 4.2.

See also focalPoint().

### QRadialGradient.setFocalPoint (self, float x, float y)

This is an overloaded function.

Sets the focal point of this radial gradient in logical coordinates to (x, y).

This function was introduced in Qt 4.2.

See also focalPoint().

### QRadialGradient.setFocalRadius (self, float radius)

Sets the focal radius of this radial gradient in logical coordinates to radius

This function was introduced in Qt 4.8.

See also focalRadius().

### QRadialGradient.setRadius (self, float radius)

Sets the radius of this radial gradient in logical coordinates to radius

Equivalent to setCenterRadius()

This function was introduced in Qt 4.2.

See also radius().