Delegate paint_sweep_gradient_func_t
public delegate void paint_sweep_gradient_func_t(nint funcs, nint paintData, nint colorLine, float x0, float y0, float startAngle, float endAngle, nint userData)
public delegate void paint_sweep_gradient_func_t(nint funcs, nint paintData, nint colorLine, float x0, float y0, float startAngle, float endAngle, nint userData)