Function radial_gradient 

pub fn radial_gradient<'a>(
    _: (impl Into<Point>, f32),
    gradient: &Gradient<'_>,
    local_matrix: impl Into<Option<&'a Matrix>>,
) -> Option<RCHandle<SkShader>>

Available on crate feature engine only.

Returns a shader that generates a radial gradient given the center and radius.

• center: The center of the circle for this gradient
• radius: Must be positive. The radius of the circle for this gradient
• gradient: Description of the colors and interpolation method
• local_matrix: Optional local matrix