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diff --git a/src/gui/position.hpp b/src/gui/position.hpp
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+////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2018 Leo Tenenbaum
+// This file is part of GraphColoring.
+//
+// GraphColoring is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GraphColoring is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GraphColoring.  If not, see <https://www.gnu.org/licenses/>.
+////////////////////////////////////////////////////////////////////////////////
+
+
+// This position class can be used for relative positions, like
+// (30% of parent width + 5 pixels, 20% of parent height - 20 pixels)
+
+#ifndef GRAPHCOLORING_GUI_POSITION_H_
+#define GRAPHCOLORING_GUI_POSITION_H_
+
+#include <string>
+
+namespace gui {
+
+class Position {
+public:
+	typedef Position Size; // "Size" alias for Positions that really refer to sizes.
+	enum class Alignment
+	{
+		LEFT,
+		CENTER,
+		RIGHT,
+		TOP = LEFT,
+		BOTTOM = RIGHT
+	};
+	Position(int x = 0, int y = 0, double relx = 0, double rely = 0,
+		const Size* parent_size = nullptr, const Position* parent_pos
+		= nullptr);
+	virtual ~Position() {}
+	int X() const;
+	int Y() const;
+	void SetX(int x);
+	void SetY(int y);
+	void SetPos(int x, int y);
+	void SetRel(double relx, double rely);
+	void SetParent(const Size* parent_size = nullptr,
+		const Position* parent_pos = nullptr);
+	int AlignedX(Alignment horizontal_align, int width)  const;
+	int AlignedY(Alignment vertical_align,   int height) const;
+	int x;
+	int y;
+	double relx;
+	double rely;
+	const Size* parent_size;
+	const Position* parent_pos;
+private:
+	static int AlignAxis(Alignment alignment, int val, int size);
+	friend std::ostream& operator<<(std::ostream& os, Position pos);
+};
+
+extern std::ostream& operator<<(std::ostream& os, Position pos);
+
+typedef Position::Alignment Alignment;
+typedef Position::Size Size;
+
+} // namespace gui
+
+#endif // GRAPHCOLORING_GUI_POSITION_H_