Function CGContextDrawRadialGradient 

pub extern "C-unwind" fn CGContextDrawRadialGradient(
    c: Option<&CGContext>,
    gradient: Option<&CGGradient>,
    start_center: CGPoint,
    start_radius: CGFloat,
    end_center: CGPoint,
    end_radius: CGFloat,
    options: CGGradientDrawingOptions,
)

👎Deprecated: renamed to CGContext::draw_radial_gradient

Available on crate features CGContext and CGGradient only.