X-Git-Url: https://git.ucc.asn.au/?p=progcomp2013.git;a=blobdiff_plain;f=agents%2Fsilverfish%2Fqchess.cpp;h=2f2a33b87a49c41066f7a4e85e772f4eebe19ced;hp=a7709725099b1b680b6106f972059ca43bf88723;hb=HEAD;hpb=7518ec8d771e731d6ffbbe00b275b7e3c4b23301

diff --git a/agents/silverfish/qchess.cpp b/agents/silverfish/qchess.cpp
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-../c++/qchess.cpp
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diff --git a/agents/silverfish/qchess.cpp b/agents/silverfish/qchess.cpp
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+/**
+ * agent++ : A Sample agent for UCC::Progcomp2013
+ * @file qchess.h
+ * @purpose Definitions for game related classes; Piece, Square, Board
+ */
+
+#include "qchess.h"
+#include <cassert>
+
+using namespace std;
+
+
+Piece::Type Piece::AllTypes[] = {PAWN, BISHOP, KNIGHT, ROOK, QUEEN, KING, UNKNOWN};
+Piece::Colour Piece::AllColours[] = {WHITE, BLACK};
+
+/**
+ * @constructor
+ * @param new_x, new_y - Position of piece
+ * @param new_colour - Colour of piece
+ * @param type1, type2 - Types of piece
+ * @param new_type_index - Index for initial type of piece
+ * @param new_piece_index - Index for piece in a vector
+ */
+Piece::Piece(int new_x, int new_y, const Piece::Colour & new_colour, const Piece::Type & type1, const Piece::Type & type2, 
+	     int new_type_index)
+	: x(new_x), y(new_y), colour(new_colour), type_index(new_type_index), types(), current_type()
+{
+	types[0] = type1; types[1] = type2;
+	if (type_index < 0 || type_index >= 2)
+	{
+		current_type = Piece::UNKNOWN;
+	}
+	else
+	{
+		current_type = types[type_index];
+	}
+}
+
+/**
+ * @constructor
+ * @param cpy - Piece to copy construct from
+ */
+Piece::Piece(const Piece & cpy) : x(cpy.x), y(cpy.y), colour(cpy.colour), type_index(cpy.type_index)
+{
+	types[0] = cpy.types[0];
+	types[1] = cpy.types[1];
+}
+
+/**
+ * @constructor
+ * @param choose_types - Indicates whether Board should setup the 2nd types of pieces; default false
+ */
+Board::Board(bool choose_types) 
+	: white(), black(), white_unknown(), black_unknown(), white_nUnknown(0), black_nUnknown(0),
+	white_king(NULL), black_king(NULL)
+{
+
+	// initialise all the Squares
+	for (int x = 0; x < BOARD_WIDTH; ++x)
+	{
+		for (int y = 0; y < BOARD_HEIGHT; ++y)
+		{
+			grid[x][y].x = x;
+			grid[x][y].y = y;
+		}
+	}
+
+	// const arrays simplify below code
+	
+
+	// frequency of each type of piece
+	map<Piece::Type, int> freq;
+	freq[Piece::ROOK] = 2;
+	freq[Piece::BISHOP] = 2;
+	freq[Piece::KNIGHT] = 2;
+	freq[Piece::QUEEN] = 1;
+	freq[Piece::PAWN] = 8;
+	
+	if (!choose_types)
+	{
+		white_unknown = freq;
+		black_unknown = freq;
+		white_nUnknown = 15;
+		black_nUnknown = 15;
+	}
+	
+	// for white and black...
+	for (int i = 0; i < 2; ++i)
+	{
+		vector<Piece*> & v = pieces(Piece::AllColours[i]); // get vector of pieces
+		
+		
+
+		// add pawns
+		int y = (i == 0) ? 1 : BOARD_HEIGHT-2;
+		for (int x = 0; x < BOARD_WIDTH; ++x)
+		{	
+			Piece::AddPiece(v, x, y, Piece::AllColours[i], Piece::PAWN, Piece::UNKNOWN);
+		}		
+
+		// add other pieces
+		y = (i == 0) ? 0 : BOARD_HEIGHT-1;
+		Piece::AddPiece(v, 0, y, Piece::AllColours[i], Piece::ROOK, Piece::UNKNOWN);
+		Piece::AddPiece(v, BOARD_WIDTH-1, y, Piece::AllColours[i], Piece::ROOK, Piece::UNKNOWN);
+		Piece::AddPiece(v, 1, y, Piece::AllColours[i], Piece::KNIGHT, Piece::UNKNOWN);
+		Piece::AddPiece(v, BOARD_WIDTH-2, y, Piece::AllColours[i], Piece::KNIGHT, Piece::UNKNOWN);
+		Piece::AddPiece(v, 2, y, Piece::AllColours[i], Piece::BISHOP, Piece::UNKNOWN);
+		Piece::AddPiece(v, BOARD_WIDTH-3, y, Piece::AllColours[i], Piece::BISHOP, Piece::UNKNOWN);
+		Piece::AddPiece(v, 3, y, Piece::AllColours[i], Piece::QUEEN, Piece::UNKNOWN);
+
+		Piece * k = Piece::AddPiece(v, 4, y, Piece::AllColours[i], Piece::KING, Piece::KING, 1);
+		if (i == 0)
+			white_king = k;
+		else
+			black_king = k;
+		
+		
+		// add to board and choose second types if required
+		map<Piece::Type, int> f(freq); 
+		int type2;
+		for (unsigned j = 0; j < v.size(); ++j)
+		{
+			Piece * p = v[j];
+			grid[p->x][p->y].piece = p;
+			if (choose_types)
+			{
+				if (p->types[1] != Piece::UNKNOWN)
+					continue;
+	
+				do
+				{
+					type2 = rand() % 5;
+				} while (f[Piece::AllTypes[type2]] <= 0);
+				f[Piece::AllTypes[type2]] -= 1;
+	
+				p->types[1] = Piece::AllTypes[type2];			
+			}
+
+			
+		}
+
+		
+
+	}
+
+}
+
+/**
+ * @constructor
+ * @param cpy - Board to clone
+ */
+Board::Board(Board & cpy) 
+: white(cpy.white), black(cpy.black), white_unknown(cpy.white_unknown), black_unknown(cpy.black_unknown), 
+  white_nUnknown(cpy.white_nUnknown), black_nUnknown(cpy.black_nUnknown), 
+  white_king(cpy.white_king), black_king(cpy.black_king)
+{
+	for (int x = 0; x < BOARD_WIDTH; ++x)
+	{
+		for (int y = 0; y < BOARD_HEIGHT; ++y)
+		{
+			grid[x][y].x = x;
+			grid[x][y].y = y;
+			if (cpy.grid[x][y].piece != NULL)
+			{
+				vector<Piece*> & v = pieces(cpy.grid[x][y].piece->colour);
+				Piece::AddPiece(v, *(cpy.grid[x][y].piece));
+			}
+		}
+	}
+}
+
+/**
+ * @destructor
+ */
+Board::~Board()
+{
+	white.clear();
+	black.clear();
+	for (int x = 0; x < BOARD_WIDTH; ++x)
+	{
+		for (int y = 0; y < BOARD_HEIGHT; ++y)
+		{
+			delete grid[x][y].piece;
+		}
+	}
+
+}
+
+/**
+ * @funct Update_select
+ * @purpose Update Piece that has been selected
+ * @param x, y - Position of Piece to update
+ * @param index - 0 or 1 - State the Piece "collapsed" into
+ * @param type - Type of the Piece as a string
+ */
+void Board::Update_select(int x, int y, int index, const string & type)
+{
+	Board::Update_select(x, y, index, Piece::str2type(type));
+}
+
+/**
+ * @funct Update_select
+ * @purpose Update Piece that has been selected
+ * @param x, y - Position of Piece to update
+ * @param index - 0 or 1 - State the Piece "collapsed" into
+ * @param t - Type of the Piece
+ */
+void Board::Update_select(int x, int y, int index, const Piece::Type & t)
+{
+	cerr << "Updating " << x << "," << y << " " << grid[x][y].piece << " " << index << " " << t << "\n";
+	Square & s = grid[x][y];
+	
+	
+	
+	assert(s.piece != NULL);
+	assert(index >= 0 && index < 2);
+	s.piece->type_index = index;
+	
+	if (s.piece->types[index] == Piece::UNKNOWN)
+	{
+		map<Piece::Type, int> & m = unknown_types(s.piece->colour);
+		int n = (m[t]--);
+		if (n < 0)
+			throw Exception("Board::Update_select", "Too many pieces of type %s found", Piece::type2str(t));
+		
+		nUnknown(s.piece->colour)--;
+		
+	}
+	s.piece->types[index] = t;
+	s.piece->current_type = t;
+	
+	for (int x = 0; x < BOARD_WIDTH; ++x)
+	{
+		for (int y = 0; y < BOARD_HEIGHT; ++y)
+		{
+			grid[x][y].Update_coverage(*this);
+		}
+	}
+}
+
+/**
+ * @funct Update_move
+ * @purpose Move a Piece from one square to another
+ * @param x1, y1 - Coords of Square containing moving Piece
+ * @param x2, y2 - Coords of Square to move into
+ * 	NOTE: Any Piece in the destination Square will be destroyed ("taken")
+ *		and the Board's other members updated accordingly
+ */
+void Board::Update_move(int x1, int y1, int x2, int y2)
+{
+	Square & s1 = grid[x1][y1];
+	Square & s2 = grid[x2][y2];
+	
+	
+
+	
+
+	if (s2.piece != NULL)
+	{
+		vector<Piece*> & p = pieces(s2.piece->colour);
+		vector<Piece*>::iterator i = p.begin();
+		while (i != p.end())
+		{
+			if (*i == s2.piece)
+			{
+				p.erase(i);
+				break;
+			}
+			++i;
+		}
+
+		Piece * k = king(s2.piece->colour);
+		if (k == s2.piece)
+		{
+			if (k->colour == Piece::WHITE)
+				white_king = NULL;
+			else
+				black_king = NULL;
+		}
+		delete s2.piece;
+
+	}	
+
+	s1.piece->x = s2.x;
+	s1.piece->y = s2.y;
+
+	s2.piece = s1.piece;
+	s1.piece = NULL;
+	
+	for (int x = 0; x < BOARD_WIDTH; ++x)
+	{
+		for (int y = 0; y < BOARD_HEIGHT; ++y)
+		{
+			grid[x][y].Update_coverage(*this);
+		}
+	}
+	
+	if ((s2.x + s2.y % 2) == 0)
+	{
+		s2.piece->type_index = -1;
+		s2.piece->current_type = Piece::UNKNOWN;
+	}
+}
+
+/**
+ * @funct Get_moves
+ * @purpose Get all moves for a Piece and store them
+ * @param p - Piece
+ * @param v - vector to store Squares in. Will *not* be cleared.
+ */
+void Board::Get_moves(Piece * p, vector<Square*> & v)
+{
+	assert(p->current_type != Piece::UNKNOWN);
+	Board::Get_moves(grid[p->x][p->y], p->current_type, v);
+}
+
+/**
+ * @funct Get_moves
+ * @purpose Get moves from a square for piece of specified type
+ * @param s - Square
+ * @param t - Type
+ * @param v - Vector to store squares in. Will *not* be cleared.
+ */
+void Board::Get_moves(Square & s, const Piece::Type & t, vector<Square*> & v)
+{
+	int x = s.x; int y = s.y;
+	Piece * p = s.piece;
+	
+	if (t == Piece::KING)
+	{
+		CheckMove(p, x+1, y, v);
+		CheckMove(p, x-1, y, v);
+		CheckMove(p, x, y+1, v);
+		CheckMove(p, x, y-1, v);
+		CheckMove(p, x+1, y+1, v);
+		CheckMove(p, x+1, y-1, v);
+		CheckMove(p, x-1, y+1, v);
+		CheckMove(p, x-1, y-1, v);
+	}
+	else if (t == Piece::KNIGHT)
+	{
+		CheckMove(p, x+2, y+1, v);
+		CheckMove(p, x+2, y-1, v);
+		CheckMove(p, x-2, y+1, v);
+		CheckMove(p, x-2, y-1, v);
+		CheckMove(p, x+1, y+2, v);
+		CheckMove(p, x-1, y+2, v);
+		CheckMove(p, x+1, y-2, v);
+		CheckMove(p, x-1, y-2, v); 
+	}
+	else if (t == Piece::PAWN)
+	{
+		int y1 = (p->colour == Piece::WHITE) ? BOARD_HEIGHT-2 : 1;
+		int y2 = (p->colour == Piece::WHITE) ? y1 - 2 : y1 + 2;
+		if (p->types[0] == Piece::PAWN && p->y == y1)
+		{
+			
+			CheckMove(p, x, y2, v);
+		}
+		y2 = (p->colour == Piece::WHITE) ? y - 1 : y + 1;
+		CheckMove(p, x, y2, v);
+
+		if (Valid_position(x-1, y2) && grid[x-1][y2].piece != NULL)
+			CheckMove(p, x-1, y2, v);
+		if (Valid_position(x+1, y2) && grid[x+1][y2].piece != NULL)
+			CheckMove(p, x+1, y2, v);
+	}
+	else if (t == Piece::BISHOP)
+	{
+		ScanMoves(p, 1, 1, v);
+		ScanMoves(p, 1, -1, v);
+		ScanMoves(p, -1, 1, v);
+		ScanMoves(p, -1, -1, v);
+	}
+	else if (t == Piece::ROOK)
+	{
+		ScanMoves(p, 1, 0, v);
+		ScanMoves(p, -1, 0, v);
+		ScanMoves(p, 0, 1, v);
+		ScanMoves(p, 0, -1, v);
+	}
+	else if (t == Piece::QUEEN)
+	{
+		ScanMoves(p, 1, 1, v);
+		ScanMoves(p, 1, -1, v);
+		ScanMoves(p, -1, 1, v);
+		ScanMoves(p, -1, -1, v);
+		ScanMoves(p, 1, 0, v);
+		ScanMoves(p, -1, 0, v);
+		ScanMoves(p, 0, 1, v);
+		ScanMoves(p, 0, -1, v);
+	}
+
+} 
+
+/**
+ * @funct CheckMove
+ * @purpose Add a move to the vector, if it is valid
+ * @param p - Piece that would move
+ * @param x, y - Destination Square coords
+ * @param v - vector to put the destination Square in, if the move is valid
+ */
+void Board::CheckMove(Piece * p, int x, int y, vector<Square*> & v)
+{
+	if (Valid_position(x, y) && (grid[x][y].piece == NULL || p == NULL || grid[x][y].piece->colour != p->colour))
+	{
+		v.push_back(&(grid[x][y]));
+	}
+	//else
+	//	cerr << "Square " << x << "," << y << " invalid; " << grid[x][y].piece << "\n";
+}
+
+/**
+ * @funct ScanMoves
+ * @purpose Add moves in a specified direction to the vector, until we get to an invalid move
+ * @param p - Piece to start scanning from
+ * @param vx, vy - "velocity" - change in coords each move
+ * @param v - vector to store valid Squares in
+ */
+void Board::ScanMoves(Piece * p, int vx, int vy, vector<Square*> & v)
+{
+	int x = p->x + vx;
+	int y = p->y + vy;
+	while (Valid_position(x, y) && (grid[x][y].piece == NULL || p == NULL ||  grid[x][y].piece->colour != p->colour))
+	{
+		v.push_back(&(grid[x][y]));
+		if (grid[x][y].piece != NULL)
+			break;
+		x += vx;
+		y += vy;
+	}
+}
+
+/**
+ * @funct ScanPiece
+ * @purpose Scan in a direction until we either hit a piece or go off the board
+ * @param s - Square to start scanning from
+ * @param vx, vy - "velocity" - change in coords each move
+ */
+Piece * Board::ScanPiece(Square & s, int vx, int vy)
+{
+	int x = s.x + vx;
+	int y = s.y + vy;
+	while (Valid_position(x, y))
+	{
+		if (grid[x][y].piece != NULL)
+			return grid[x][y].piece;
+		x += vx;
+		y += vy;
+	}
+	return NULL;
+}
+
+/**
+ * @funct str2type
+ * @purpose Convert string to Piece::Type
+ * @param str - The string
+ * @returns A Piece::Type
+ */
+Piece::Type Piece::str2type(const string & str)
+{
+	if (str == "king")
+		return Piece::KING;
+	else if (str == "queen")
+		return Piece::QUEEN;
+	else if (str == "rook")
+		return Piece::ROOK;
+	else if (str == "bishop")
+		return Piece::BISHOP;
+	else if (str == "knight")
+		return Piece::KNIGHT;
+	else if (str == "pawn")
+		return Piece::PAWN;
+	else if (str == "unknown")
+		return Piece::UNKNOWN;
+
+	throw Exception("Piece::str2type", "String \"%s\" doesn't represent a type", str.c_str());
+	return Piece::UNKNOWN;
+}
+
+/**
+ * @funct type2str
+ * @purpose Convert Piece::Type to string
+ * @param t - The Types
+ * @returns a const char*
+ */
+const char * Piece::type2str(const Piece::Type & t)
+{
+	switch (t)
+	{
+		case PAWN:
+			return "pawn";
+		case BISHOP:
+			return "bishop";
+		case KNIGHT:
+			return "knight";
+		case ROOK:
+			return "rook";
+		case QUEEN:
+			return "queen";
+		case UNKNOWN:
+			return "unknown";
+		case KING:
+			return "king";
+		default:
+			throw Exception("Piece::type2str", "Unknown type %d", (int)t);
+			return "";
+	}
+}
+
+/**
+ * @funct str2colour
+ * @purpose Convert string to Piece::Colour
+ * @param str - The string
+ * @returns A Piece::Colour
+ */
+Piece::Colour Piece::str2colour(const string & str)
+{
+	if (str == "white")
+		return Piece::WHITE;
+	else if (str == "black")
+		return Piece::BLACK;
+
+	throw Exception("Piece::str2colour", "string \"%s\" is not white|black", str.c_str());
+	return Piece::BLACK; // should never get here
+}
+
+/**
+ * @funct AddPiece
+ * @purpose Creates a new Piece and adds it to a vector
+ * @param v - The vector
+ * @params - All remaining parameters passed to Piece::Piece
+ * @returns Pointer to the new Piece
+ */
+Piece * Piece::AddPiece(vector<Piece*> & v, int x, int y, const Piece::Colour & colour, const Piece::Type & t1, const Piece::Type & t2,
+			int type_index)
+{
+	Piece * p = new Piece(x,y,colour,t1, t2,type_index);
+	v.push_back(p);
+	return p;
+}
+
+/**
+ * @funct AddPiece
+ * @purpose Copy a Piece and add it to a vector
+ * @param v - The vector
+ * @param cpy - Piece to copy
+ * @returns Pointer to the new Piece
+ */
+Piece * Piece::AddPiece(vector<Piece*> & v, const Piece & cpy)
+{
+	Piece * p = new Piece(cpy);
+	v.push_back(p);
+	return p;
+}
+
+/**
+ * @funct Update_coverage
+ * @purpose Update the map of Pieces that cover a square
+ * @param b - Board to use for updating
+ */
+
+void Square::Update_coverage(Board & b)
+{
+	coverage[Piece::WHITE].clear();
+	coverage[Piece::BLACK].clear();
+	
+	
+	static int directions[][2] = {{-1,0},{1,0},{0,-1},{0,1},{-1,-1},{-1,1},{1,-1},{1,1}};
+	
+	
+	
+	for (unsigned i = 0; i < sizeof(directions); ++i)
+	{
+		Piece * p = b.ScanPiece(*this, directions[i][0], directions[i][1]);
+		if (p == NULL)
+			continue;
+		double prob = 0.0;
+	
+		// take care of kings
+		if (abs(p->x - x) + abs(p->y - y) && p->current_type == Piece::KING)
+		{
+			coverage[p->colour][p] = 1.0;
+			continue;
+		}
+		
+		switch (i)
+		{
+			// ranks
+			case 0:
+			case 1:
+			case 2:
+			case 3:
+				prob = p->ProbIsType(b,Piece::ROOK) + p->ProbIsType(b,Piece::QUEEN);
+				if (i == 2 && p->colour == Piece::WHITE)
+				{
+					if (abs(y - p->y) < 1 || ((p->y == BOARD_HEIGHT-2 && abs(y - p->y) == 2)))
+						prob += p->ProbIsType(b,Piece::PAWN);
+				}
+				if (i == 3 && p->colour == Piece::BLACK)
+				{
+					if (abs(y - p->y) < 1 || ((p->y == 1 && abs(y - p->y) == 2)))
+						prob += p->ProbIsType(b,Piece::PAWN);
+				}
+				
+				if (prob > 0.001)
+					coverage[p->colour][p] = prob;
+				break;
+			
+			//diagonals
+			case 4:
+			case 5:
+			case 6:
+			case 7:
+				prob = p->ProbIsType(b,Piece::BISHOP) + p->ProbIsType(b,Piece::QUEEN);
+				if ((i == 4 || i == 6) && p->colour == Piece::WHITE)
+				{
+					if (abs(y - p->y) == 1 && abs(x - p->x) == 1)
+						prob += p->ProbIsType(b, Piece::PAWN);
+				}
+				if ((i == 5 || i == 7) && p->colour == Piece::BLACK)
+				{
+					if (abs(y - p->y) == 1 && abs(x - p->x) == 1)
+						prob += p->ProbIsType(b, Piece::PAWN);
+				}
+				
+				if (prob > 0.001)
+					coverage[p->colour][p] = prob;
+				break;
+		}
+		
+	}
+	
+	// check knights
+	static int knight_pos[][2] = {{-1,2},{1,2},{-1,-2},{-1,2}, {-2,1},{-2,-1},{2,1},{2,-1}};
+	for (unsigned i = 0; i < sizeof(knight_pos); ++i)
+	{
+		if (!b.Valid_position(x+knight_pos[i][0], y+knight_pos[i][1]))
+			continue;
+		
+		Piece * p = b.SquareAt(x+knight_pos[i][0],y+knight_pos[i][1]).piece;
+		if (p != NULL)
+		{
+			double prob = p->ProbIsType(b, Piece::KNIGHT);
+			if (prob > 0.001)
+				coverage[p->colour][p] = prob;
+		}
+		
+	}
+		
+	
+}
+/**
+ * @funct ProbIsType
+ * @purpose Determine the probability that a Piece will become the specified type on its next selection
+ * @param b - Board to use to calculate probabilities
+ * @param t - The type
+ * @returns Probability that the piece's type becomes t on its next selection taking into account unknown types
+ */
+double Piece::ProbIsType(Board & b, const Piece::Type & t)
+{
+	if (current_type != Piece::UNKNOWN)
+		return (current_type == t) ? 1.0 : 0.0;
+	
+	
+	double prob = 0.0;
+	map<Piece::Type, int> & m = b.unknown_types(colour);
+	int nUnknown = b.nUnknown(colour);
+	for (unsigned i = 0; i < sizeof(types); ++i)
+	{
+		if (types[i] != Piece::UNKNOWN)
+		{
+			prob += (1.0 / double(sizeof(types))) * (double)(types[i] == t);
+		}
+		else
+		{
+			prob += (1.0 / double(sizeof(types))) * (m[t] / double(nUnknown));
+		}
+	}
+	return prob;
+}
+
+/**
+ * @funct SquareAt
+ * @purpose Return square at a position on the board
+ * @param x - x coord
+ * @param y - y coord
+ */
+Square & Board::SquareAt(int x, int y)
+{
+	if (!Valid_position(x, y))
+		throw Exception("Board::SquareAt", "Invalid position %d,%d", x, y);
+	return grid[x][y];
+}
\ No newline at end of file