Creates a shading object to use for radial shading.
Original signature is 'CGShadingRef CGShadingCreateRadial ( CGColorSpaceRef colorspace, CGPoint start, CGFloat startRadius, CGPoint end, CGFloat endRadius, CGFunctionRef function, bool extendStart, bool extendEnd );'
Available in Mac OS X version 10.2 and later.

C# | Visual Basic | Visual C++ |
public static IntPtr CreateRadial( IntPtr colorspace, CGPoint start, CGFloat startRadius, CGPoint end, CGFloat endRadius, IntPtr function, bool extendStart, bool extendEnd )

A new Quartz radial shading. You are responsible for releasing this object using CGShadingRelease.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)