Delegate paint_radial_gradient_func_t
public delegate void paint_radial_gradient_func_t(IntPtr funcs, IntPtr paintData, IntPtr colorLine, float x0, float y0, float r0, float x1, float y1, float r1, IntPtr userData)
public delegate void paint_radial_gradient_func_t(IntPtr funcs, IntPtr paintData, IntPtr colorLine, float x0, float y0, float r0, float x1, float y1, float r1, IntPtr userData)