Add ui::null_shape

libs/ui/include/psemek/ui/null_shape.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <psemek/ui/shape.hpp>
+
+namespace psemek::ui
+{
+
+	struct null_shape
+		: shape
+	{
+		bool contains(geom::point<float, 2> const & point) const override;
+		geom::box<float, 2> bbox() const override;
+	};
+
+}

libs/ui/source/null_shape.cpp

@@ -0,0 +1,16 @@
+#include <psemek/ui/null_shape.hpp>
+
+namespace psemek::ui
+{
+
+	bool null_shape::contains(geom::point<float, 2> const &) const
+	{
+		return false;
+	}
+
+	geom::box<float, 2> null_shape::bbox() const
+	{
+		return geom::box<float, 2>{{{0.f, 0.f}, {0.f, 0.f}}};
+	}
+
+}