Paint.RadialGradient (gb.qt4)
Static Function RadialGradient ( CX As Float, CY As Float, Radius As Float, FX As Float, FY As Float, Colors As Integer[], Positions As Float[] [ , Extend As Integer ] ) As PaintBrush
Creates a new radial gradient paint brush that interpolates colors between a focal point ( FX , FY ) and end points on a circle defined by ( CX0 , CY0 , Radius0 ), and using color stops defined by the Colors and Positions arguments.

CX : x coordinate for the center of the circle.

CY : y coordinate for the center of the circle.

Radius : radius of the circle.

FX : x coordinate for the gradient focal point.

FY : y coordinate for the gradient focal point.

Colors : an array of color stops.

Positions : the position of each color, 0 being the gradient start, and 1 the gradient end.
The coordinates here are in brush space. For a new brush, brush space is identical to user space, but the relationship between the spaces can be changed by setting the PaintBrush.Matrix property.