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https://github.com/coding-horror/basic-computer-games.git
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Ported 56 Life for Two to Java
This commit is contained in:
Aldrin Misquitta
305
56_Life_for_Two/java/LifeForTwo.java
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305
56_Life_for_Two/java/LifeForTwo.java
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import java.util.*;
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import java.util.stream.IntStream;
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/**
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* Life for Two
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* <p>
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* The original BASIC program uses a grid with an extras border of cells all around,
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* probably to simplify calculations and manipulations. This java program has the exact
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* grid size and instead uses boundary check conditions in the logic.
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* <p>
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* Converted from BASIC to Java by Aldrin Misquitta (@aldrinm)
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*/
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public class LifeForTwo {
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final static int GRID_SIZE = 5;
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//Pair of offset which when added to the current cell's coordinates,
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// give the coordinates of the neighbours
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final static int[] neighbourCellOffsets = {
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-1, 0,
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1, 0,
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0, -1,
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0, 1,
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-1, -1,
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1, -1,
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-1, 1,
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1, 1
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};
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//The best term that I could come with to describe these numbers was 'masks'
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//They act like indicators to decide which player won the cell. The value is the score of the cell after all the
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// generation calculations.
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final static List<Integer> maskPlayer1 = List.of(3, 102, 103, 120, 130, 121, 112, 111, 12);
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final static List<Integer> maskPlayer2 = List.of(21, 30, 1020, 1030, 1011, 1021, 1003, 1002, 1012);
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public static void main(String[] args) {
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printIntro();
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Scanner scan = new Scanner(System.in);
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scan.useDelimiter("\\D");
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int[][] grid = new int[GRID_SIZE][GRID_SIZE];
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initializeGrid(grid);
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//Read the initial 3 moves for each player
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for (int b = 1; b <= 2; b++) {
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System.out.printf("\nPLAYER %d - 3 LIVE PIECES.%n", b);
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for (int k1 = 1; k1 <= 3; k1++) {
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var player1Coordinates = readUntilValidCoordinates(scan, grid);
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grid[player1Coordinates.x - 1][player1Coordinates.y - 1] = (b == 1 ? 3 : 30);
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}
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}
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printGrid(grid);
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calculatePlayersScore(grid); //Convert 3, 30 to 100, 1000
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resetGridForNextGen(grid);
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computeCellScoresForOneGen(grid);
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var playerScores = calculatePlayersScore(grid);
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resetGridForNextGen(grid);
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boolean gameOver = false;
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while (!gameOver) {
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printGrid(grid);
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if (playerScores.getPlayer1Score() == 0 && playerScores.getPlayer2Score() == 0) {
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System.out.println("\nA DRAW");
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gameOver = true;
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} else if (playerScores.getPlayer2Score() == 0) {
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System.out.println("\nPLAYER 1 IS THE WINNER");
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gameOver = true;
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} else if (playerScores.getPlayer1Score() == 0) {
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System.out.println("\nPLAYER 2 IS THE WINNER");
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gameOver = true;
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} else {
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System.out.print("PLAYER 1 ");
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Coordinate player1Move = readCoordinate(scan);
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System.out.print("PLAYER 2 ");
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Coordinate player2Move = readCoordinate(scan);
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if (!player1Move.equals(player2Move)) {
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grid[player1Move.x - 1][player1Move.y - 1] = 100;
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grid[player2Move.x - 1][player2Move.y - 1] = 1000;
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}
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//In the original, B is assigned 99 when both players choose the same cell
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//and that is used to control the flow
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computeCellScoresForOneGen(grid);
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playerScores = calculatePlayersScore(grid);
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resetGridForNextGen(grid);
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}
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}
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}
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private static void initializeGrid(int[][] grid) {
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for (int[] row : grid) {
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Arrays.fill(row, 0);
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}
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}
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private static void computeCellScoresForOneGen(int[][] grid) {
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for (int i = 0; i < GRID_SIZE; i++) {
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for (int j = 0; j < GRID_SIZE; j++) {
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if (grid[i][j] >= 100) {
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calculateScoreForOccupiedCell(grid, i, j);
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}
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}
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}
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}
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private static Scores calculatePlayersScore(int[][] grid) {
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int m2 = 0;
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int m3 = 0;
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for (int i = 0; i < GRID_SIZE; i++) {
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for (int j = 0; j < GRID_SIZE; j++) {
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if (grid[i][j] < 3) {
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grid[i][j] = 0;
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} else {
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if (maskPlayer1.contains(grid[i][j])) {
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m2++;
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} else if (maskPlayer2.contains(grid[i][j])) {
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m3++;
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}
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}
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}
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}
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return new Scores(m2, m3);
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}
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private static void resetGridForNextGen(int[][] grid) {
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for (int i = 0; i < GRID_SIZE; i++) {
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for (int j = 0; j < GRID_SIZE; j++) {
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if (grid[i][j] < 3) {
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grid[i][j] = 0;
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} else {
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if (maskPlayer1.contains(grid[i][j])) {
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grid[i][j] = 100;
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} else if (maskPlayer2.contains(grid[i][j])) {
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grid[i][j] = 1000;
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} else {
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grid[i][j] = 0;
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}
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}
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}
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}
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}
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private static void calculateScoreForOccupiedCell(int[][] grid, int i, int j) {
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var b = 1;
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if (grid[i][j] > 999) {
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b = 10;
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}
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for (int k = 0; k < 15; k += 2) {
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//check bounds
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var neighbourX = i + neighbourCellOffsets[k];
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var neighbourY = j + neighbourCellOffsets[k + 1];
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if (neighbourX >= 0 && neighbourX < GRID_SIZE &&
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neighbourY >= 0 && neighbourY < GRID_SIZE) {
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grid[neighbourX][neighbourY] = grid[neighbourX][neighbourY] + b;
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}
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}
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}
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private static void printGrid(int[][] grid) {
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System.out.println();
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printRowEdge();
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System.out.println();
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for (int i = 0; i < grid.length; i++) {
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System.out.printf("%d ", i + 1);
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for (int j = 0; j < grid[i].length; j++) {
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System.out.printf(" %c ", mapChar(grid[i][j]));
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}
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System.out.printf(" %d", i + 1);
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System.out.println();
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}
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printRowEdge();
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System.out.println();
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}
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private static void printRowEdge() {
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System.out.print("0 ");
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IntStream.range(1, GRID_SIZE + 1).forEach(i -> System.out.printf(" %s ", i));
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System.out.print(" 0");
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}
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private static char mapChar(int i) {
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if (i == 3 || i == 100) {
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return '*';
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}
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if (i == 30 || i == 1000) {
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return '#';
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}
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return ' ';
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}
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private static Coordinate readUntilValidCoordinates(Scanner scanner, int[][] grid) {
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boolean coordinateInRange = false;
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Coordinate coordinate = null;
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while (!coordinateInRange) {
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coordinate = readCoordinate(scanner);
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if (coordinate.x <= 0 || coordinate.x > GRID_SIZE
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|| coordinate.y <= 0 || coordinate.y > GRID_SIZE
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|| grid[coordinate.x - 1][coordinate.y - 1] != 0) {
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System.out.println("ILLEGAL COORDS. RETYPE");
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} else {
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coordinateInRange = true;
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}
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}
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return coordinate;
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}
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private static Coordinate readCoordinate(Scanner scanner) {
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Coordinate coordinate = null;
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int x, y;
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boolean valid = false;
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System.out.println("X,Y");
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System.out.print("XXXXXX\r");
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System.out.print("$$$$$$\r");
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System.out.print("&&&&&&\r");
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while (!valid) {
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try {
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System.out.print("? ");
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y = scanner.nextInt();
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x = scanner.nextInt();
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valid = true;
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coordinate = new Coordinate(x, y);
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} catch (InputMismatchException e) {
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System.out.println("!NUMBER EXPECTED - RETRY INPUT LINE");
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valid = false;
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} finally {
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scanner.nextLine();
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}
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}
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return coordinate;
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}
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private static void printIntro() {
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System.out.println(" LIFE2");
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System.out.println(" CREATIVE COMPUTING MORRISTOWN, NEW JERSEY");
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System.out.println("\n\n");
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System.out.println("\tU.B. LIFE GAME");
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}
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private static class Coordinate {
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private final int x, y;
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public Coordinate(int x, int y) {
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this.x = x;
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this.y = y;
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}
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public int getX() {
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return x;
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}
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public int getY() {
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return y;
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}
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@Override
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public String toString() {
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return "Coordinate{" +
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"x=" + x +
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", y=" + y +
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'}';
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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Coordinate that = (Coordinate) o;
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return x == that.x && y == that.y;
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}
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@Override
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public int hashCode() {
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return Objects.hash(x, y);
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}
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}
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private static class Scores {
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private final int player1Score;
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private final int player2Score;
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public Scores(int player1Score, int player2Score) {
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this.player1Score = player1Score;
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this.player2Score = player2Score;
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}
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public int getPlayer1Score() {
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return player1Score;
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}
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public int getPlayer2Score() {
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return player2Score;
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}
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}
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}
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