Method: evaluateState(TicTacToeState)

1: package de.fhdw.gaming.ipspiel23.tictactoe.core.evaluation;
2:
3: import java.util.Optional;
4:
5: import de.fhdw.gaming.ipspiel23.tictactoe.core.domain.TicTacToeField;
6: import de.fhdw.gaming.ipspiel23.tictactoe.core.domain.TicTacToeFieldState;
7: import de.fhdw.gaming.ipspiel23.tictactoe.core.domain.TicTacToePosition;
8: import de.fhdw.gaming.ipspiel23.tictactoe.core.domain.TicTacToeState;
9:
10: /**
11: * A simple evaluation strategy for evaluating the state of a Tic-Tac-Toe game.
12: * This strategy assigns scores to different game states based on the arrangement of marks on the board.
13: *
14: * The evaluation score is determined by counting the number of marks in each row, column, and diagonal.
15: * A higher score indicates a more favorable state for the current player.
16: *
17: * The evaluation scores are predefined and can be adjusted by modifying the scoreLine() method.
18: *
19: * @see IEvaluationStrategy
20: * @see TicTacToeState
21: *
22: */
23: public class SimpleEvaluationStrategy implements IEvaluationStrategy {
24:
25: /**
26: * Evaluates the given Tic-Tac-Toe game state using the simple evaluation strategy.
27: * The evaluation score is determined by counting the number of marks in each
28: * row, column, and diagonal,
29: * and assigning predefined scores based on the counts.
30: * Too complex, but not easily simplifyable. Warning suppressed.
31: *
32: * @param state The Tic-Tac-Toe game state to be evaluated.
33: * @return An optional containing the evaluation score as an integer value.
34: */
35: @Override
36: @SuppressWarnings({ "checkstyle:CyclomaticComplexity", "PMD.CyclomaticComplexity",
37: "PMD.CognitiveComplexity" })
38: public Optional<Integer> evaluateState(final TicTacToeState state) {
39: int rowSum;
40: int colSum;
41: int diagSum1;
42: int diagSum2;
43: int score = 0;
44:
45: final int boardSize = state.getBoard().getSize();
46:• for (int i = 0; i < boardSize; i++) {
47: rowSum = 0;
48: colSum = 0;
49:• for (int j = 0; j < boardSize; j++) {
50: final TicTacToeField rField = state.getBoard().getFieldAt(TicTacToePosition.of(i, j));
51: final TicTacToeField cField = state.getBoard().getFieldAt(TicTacToePosition.of(j, i));
52:
53:• if (rField.getState().equals(TicTacToeFieldState.CROSS)) {
54: rowSum += 1;
55:• } else if (rField.getState().equals(TicTacToeFieldState.NOUGHT)) {
56: rowSum -= 1;
57: }
58:
59:• if (cField.getState().equals(TicTacToeFieldState.CROSS)) {
60: colSum += 1;
61:• } else if (cField.getState().equals(TicTacToeFieldState.NOUGHT)) {
62: colSum -= 1;
63: }
64: score += scoreLine(rowSum, boardSize);
65: score += scoreLine(colSum, boardSize);
66:
67: }
68:
69: }
70:
71: diagSum1 = 0;
72: diagSum2 = 0;
73:
74:• for (int i = 0; i < boardSize; i++) {
75:
76: final TicTacToeField dAscField = state.getBoard().getFieldAt(TicTacToePosition.of(i, i));
77: final TicTacToeField dDescField = state.getBoard().
78: getFieldAt(TicTacToePosition.of(i, boardSize - i - 1));
79:
80:• if (dAscField.getState().equals(TicTacToeFieldState.CROSS)) {
81: diagSum1 += 1;
82:• } else if (dAscField.getState().equals(TicTacToeFieldState.NOUGHT)) {
83: diagSum1 -= 1;
84: }
85:• if (dDescField.getState().equals(TicTacToeFieldState.CROSS)) {
86: diagSum2 += 1;
87:• } else if (dDescField.getState().equals(TicTacToeFieldState.NOUGHT)) {
88: diagSum2 -= 1;
89: }
90:
91: }
92: score += scoreLine(diagSum1, boardSize);
93: score += scoreLine(diagSum2, boardSize);
94:
95: return Optional.of(score);
96:
97: }
98:
99: /**
100: * Determines the score for a line based on the number of marks and the board size.
101: * The predefined scores are as follows:
102: * - If the line has all marks of the current player: 100 (winning state)
103: * - If the line has all marks of the opponent player: -100 (losing state)
104: * - If the line has one mark less than the board size
105: * and all other marks are of the current player: 10 (advantage state)
106: * - If the line has one mark less than the board size
107: * and all other marks are of the opponent player: -10 (disadvantage state)
108: * - Otherwise: 0 (neutral state)
109: *
110: * @param lineSum The sum of marks in the line.
111: * @param boardSize The size of the game board.
112: * @return The score for the line.
113: */
114: private int scoreLine(final int lineSum, final int boardSize) {
115: if (lineSum == boardSize) {
116: return 100;
117: }
118: if (lineSum == -boardSize) {
119: return -100;
120: }
121: if (lineSum == boardSize - 1) {
122: return 10;
123: }
124: if (lineSum == -boardSize + 1) {
125: return -10;
126: }
127: return 0;
128: }
129: }