From 8bdaf0c5dd126e2432003a3dc9fe295c4e523c9d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20B=C3=BChler?= <stbuehler@web.de>
Date: Tue, 6 Jan 2009 17:34:32 +0100
Subject: [PATCH] added some game logic

---
 src/toruschess.cpp | 45 +++++++++++++++++++++++++++++++++++++--------
 src/toruschess.h   | 41 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 77 insertions(+), 9 deletions(-)

diff --git a/src/toruschess.cpp b/src/toruschess.cpp
index 3b08472..4a897e4 100644
--- a/src/toruschess.cpp
+++ b/src/toruschess.cpp
@@ -21,17 +21,13 @@
 
 namespace toruschess {
 
-	Game::Game(QObject *parent)
-	: QObject(parent), m_field(new Field()) { }
-
-	Game::~Game() {
-		delete m_field;
-	}
+	Move::Move(const Field* field, const Pos &from, const Pos &to)
+	: m_from(from), m_to(to), m_prevFrom(field->place(from)), m_prevTo(field->place(to)), m_player(field->player(from)) { }
 
 	static const int start_field[8][8] = {
-		{ -ROOK, -PAWN, -KNIGHT, 0, 0, 0, 0, 0 },
-		{ -BISHOP, -KING, -QUEEN, 0, 0, 0, 0, 0 },
 		{ -KNIGHT, -PAWN, -ROOK, 0, 0, 0, 0, 0 },
+		{ -BISHOP, -KING, -QUEEN, 0, 0, 0, 0, 0 },
+		{ -ROOK, -PAWN, -KNIGHT, 0, 0, 0, 0, 0 },
 		{ 0, 0, 0, 0, 0, 0, 0, 0 },
 		{ 0, 0, 0, 0, ROOK, PAWN, KNIGHT, 0 },
 		{ 0, 0, 0, 0, QUEEN, KING, BISHOP, 0 },
@@ -42,4 +38,37 @@ namespace toruschess {
 	Field::Field() {
 		memcpy(m_places, start_field, sizeof(start_field));
 	}
+
+	QList<Move> Field::validMoves(const Pos &p) {
+		QList<Move> moves;
+		int thePlace = place(p);
+		Piece thePiece = (Piece) qAbs(thePlace);
+		switch (thePiece) {
+		case NOPIECE:
+			break;
+		}
+		return moves;
+	}
+	bool Field::validMove(const Move &m) {
+		QList<Move> moves = validMoves(m.from());
+		return moves.contains(m);
+	}
+	bool Field::move(const Move &m) {
+		if (!validMove(m)) return false;
+		return true;
+	}
+	bool Field::undo(const Move &m) {
+		if (place(m.from()) != 0 || place(m.to()) != m.prevFrom()) return false;
+		place(m.from()) = m.prevFrom();
+		place(m.to()) = m.prevTo();
+		return false;
+	}
+
+	Game::Game(QObject *parent)
+	: QObject(parent), m_field(new Field()) { }
+
+	Game::~Game() {
+		delete m_field;
+	}
+
 }
diff --git a/src/toruschess.h b/src/toruschess.h
index f3c8645..49d3e84 100644
--- a/src/toruschess.h
+++ b/src/toruschess.h
@@ -21,12 +21,17 @@
 #define TORUSCHESSTORUSCHESS_H
 
 #include <QObject>
+#include <QList>
 
 /**
 	@author Stefan Bühler <stbuehler@web.de>
 */
 namespace toruschess {
 
+	class Pos;
+	class Field;
+	class Game;
+
 	typedef enum { BLACK = -1, NOPLAYER = 0, WHITE = 1 } Player;
 	typedef enum { NOPIECE = 0, PAWN = 1, KNIGHT = 2, BISHOP = 3, ROOK = 4, QUEEN = 5, KING = 6 } Piece;
 
@@ -36,11 +41,39 @@ namespace toruschess {
 		
 		int x() const { return m_x; }
 		int y() const { return m_y; }
-	
+		
+		bool operator==(const Pos &other) {
+			return m_x == other.m_x && m_y == other.m_y;
+		}
+		
 	private:
 		int m_x, m_y;
 	};
 
+	class Move {
+	public:
+		Move(const Field* field, const Pos &from, const Pos &to);
+		
+		const Pos& from() const { return m_from; }
+		const Pos& to() const { return m_to; }
+		int prevFrom() const { return m_prevFrom; }
+		int prevTo() const { return m_prevTo; }
+		Player player() const { return m_player; }
+		
+		bool operator==(const Move &other) {
+			return m_from == other.m_from
+			    && m_to == other.m_to
+			    && m_prevFrom == other.m_prevFrom
+			    && m_prevTo == other.m_prevTo;
+			/* player is included in m_prevFrom */
+		}
+		
+	private:
+		Pos m_from,m_to;
+		int m_prevFrom, m_prevTo;
+		Player m_player;
+	};
+
 	class Field {
 	public:
 		Field();
@@ -51,6 +84,12 @@ namespace toruschess {
 		}
 		Piece piece(const Pos &p) const { return (Piece) qAbs(place(p)); }
 		int place(const Pos &p) const { return m_places[p.y()][p.x()]; }
+		int& place(const Pos &p) { return m_places[p.y()][p.x()]; }
+		
+		QList<Move> validMoves(const Pos &p);
+		bool validMove(const Move &m);
+		bool move(const Move &m);
+		bool undo(const Move &m);
 		
 	private:
 		int m_places[8][8];