Add new Grid class. (which is header only due to template)

1 files changed, 137 insertions, 0 deletions

diff --git a/src/grid.h b/src/grid.h
new file mode 100644
index 0000000..6d3933b
--- /dev/null
+++ b/src/grid.h
@@ -0,0 +1,137 @@
+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ *            grid.h
+ *
+ *  Sat Jun 16 11:52:08 CEST 2018
+ *  Copyright 2018 André Nusser
+ *  andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include <vector>
+
+template <typename T>
+class Grid
+{
+public:
+	using Index = std::size_t;
+	struct Pos
+	{
+		T x, y;
+
+		Pos(T x, T y) : x(x), y(y) {}
+	};
+
+	Grid() = default;
+	Grid(Index width, Index height);
+	Grid(Index width, Index height, T value);
+
+	bool is_valid(Index x, Index y) const;
+	bool is_valid(Pos pos) const;
+
+	Index width() const;
+	Index height() const;
+	T operator()(Pos pos) const;
+	T operator()(Index x, Index y) const;
+	T& operator()(Pos pos);
+	T& operator()(Index x, Index y);
+
+	void resize(Index width, Index height);
+	void assign(Index width, Index height, T value);
+
+private:
+	Index _width;
+	Index _height;
+	std::vector<T> _entries;
+
+};
+
+template <typename T>
+Grid<T>::Grid(Index width, Index height)
+	: _width(width), _height(height), _entries(_width*_height) {}
+
+template <typename T>
+Grid<T>::Grid(Index width, Index height, T value)
+	: _width(width), _height(height), _entries(_width*_height, value) {}
+
+template <typename T>
+bool Grid<T>::is_valid(Index x, Index y) const
+{
+	return x >= 0 && x < _width && y >= 0 && y < _height;
+}
+
+template <typename T>
+bool Grid<T>::is_valid(Pos pos) const
+{
+	return is_valid(pos.x, pos.y);
+}
+
+template <typename T>
+auto Grid<T>::width() const -> Index
+{
+	return _width;
+}
+	
+template <typename T>
+auto Grid<T>::height() const -> Index
+{
+	return _height;
+}
+
+template <typename T>
+T Grid<T>::operator()(Pos pos) const
+{
+	return _entries.at(pos.x + _width*pos.y);
+}
+
+template <typename T>
+T Grid<T>::operator()(Index x, Index y) const
+{
+	return _entries.at(x + _width*y);
+}
+
+template <typename T>
+T& Grid<T>::operator()(Pos pos)
+{
+	return _entries.at(pos.x + _width*pos.y);
+}
+
+template <typename T>
+T& Grid<T>::operator()(Index x, Index y)
+{
+	return _entries.at(x + _width*y);
+}
+
+template <typename T>
+void Grid<T>::resize(Index width, Index height)
+{
+	_width = width;
+	_height = height;
+	_entries.resize(_width*_height);
+}
+
+template <typename T>
+void Grid<T>::assign(Index width, Index height, T value)
+{
+	_width = width;
+	_height = height;
+	_entries.assign(_width*_height, value);
+}