DrawShapeGradient
virtual void DrawShapeGradient(const BShape& shape, BGradient& gradient, bool fill) {}
virtual void DrawShapeGradient(const BShape& shape, BGradient& gradient, bool fill);
callbacks.DrawShapeGradient(shape, *gradient,
virtual void DrawShapeGradient(const BShape& shape, BGradient& gradient, bool fill);
virtual void DrawShapeGradient(const BShape& shape, BGradient& gradient, bool fill);