pretty cool

app/src/main/java/chess/simplerender/Window.java

@@ -0,0 +1,123 @@
+package chess.simplerender;
+
+import java.awt.Color;
+import java.awt.GridLayout;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+
+import chess.model.ChessBoard;
+import chess.model.Coordinate;
+import chess.model.Game;
+import chess.model.Move;
+
+public class Window extends JFrame {
+
+	private final JLabel cells[][];
+	private final Game game;
+	private final ChessBoard board;
+
+	private Coordinate lastClick = null;
+
+	public Window(Game game) {
+		this.cells = new JLabel[8][8];
+		this.game = game;
+		this.board = game.getBoard();
+		initSlots();
+		build();
+		setSize(800, 800);
+		setVisible(true);
+		setDefaultCloseOperation(EXIT_ON_CLOSE);
+	}
+
+	private void initSlots() {
+		this.game.OnRenderUpdate.connect(this::updateBoard);
+		this.game.OnMoveRefused.connect(this::drawInvalid);
+	}
+
+	private Color getCellColor(int x, int y) {
+		return ((x + y) % 2 == 1) ? Color.BLACK : Color.WHITE;
+	}
+
+	private void build() {
+		JPanel content = new JPanel(new GridLayout(8, 8));
+		setContentPane(content);
+		for (int y = 0; y < 8; y++) {
+			for (int x = 0; x < 8; x++) {
+				JLabel label = new JLabel();
+				label.setOpaque(true);
+				label.setBackground(getCellColor(x, y));
+				this.cells[x][y] = label;
+
+				final int xx = x;
+				final int yy = y;
+
+				label.addMouseListener(new MouseAdapter() {
+					@Override
+					public void mouseClicked(MouseEvent e) {
+						onCellClicked(xx, yy);
+					}
+				});
+				content.add(label);
+			}
+		}
+		updateBoard();
+	}
+
+	private void updateBoard() {
+		PieceIcon pieceIcon = new PieceIcon();
+		for (int y = 0; y < 8; y++) {
+			for (int x = 0; x < 8; x++) {
+				JLabel cell = this.cells[x][y];
+				cell.setIcon(pieceIcon.getIcon(this.board.pieceAt(new Coordinate(x, y))));
+			}
+		}
+	}
+
+	private void previewMoves(int x, int y) {
+		boolean[][] allowedMoves = this.board.getAllowedMoves(new Coordinate(x, y));
+		if (allowedMoves == null)
+			return;
+		for (int i = 0; i < 8; i++) {
+			for (int j = 0; j < 8; j++) {
+				JLabel cell = this.cells[i][j];
+				if (allowedMoves[i][j])
+					cell.setBackground(Color.CYAN);
+			}
+		}
+	}
+
+	private void drawInvalid(Move move) {
+		JLabel from = this.cells[move.getStart().getX()][move.getStart().getY()];
+		JLabel to = this.cells[move.getFinish().getX()][move.getFinish().getY()];
+		from.setBackground(Color.RED);
+		to.setBackground(Color.RED);
+	}
+
+	private void clearMoves() {
+		for (int y = 0; y < 8; y++) {
+			for (int x = 0; x < 8; x++) {
+				JLabel cell = this.cells[x][y];
+				cell.setBackground(getCellColor(x, y));
+			}
+		}
+	}
+
+	private void onCellClicked(int x, int y) {
+		clearMoves();
+		if (this.lastClick == null) {
+			if (this.board.isCellEmpty(new Coordinate(x, y)))
+				return;
+			this.lastClick = new Coordinate(x, y);
+			previewMoves(x, y);
+			return;
+		}
+		if (!this.lastClick.equals(new Coordinate(x, y)))
+			this.game.tryMove(new Move(lastClick, new Coordinate(x, y)));
+		this.lastClick = null;
+	}
+
+}