change project structure

app/src/main/java/chess/view/simplerender/PieceIcon.java

@@ -0,0 +1,75 @@
+package chess.view.simplerender;
+
+import java.awt.Image;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+
+import chess.model.Color;
+import chess.model.Piece;
+import chess.model.PieceVisitor;
+import chess.model.pieces.Bishop;
+import chess.model.pieces.King;
+import chess.model.pieces.Knight;
+import chess.model.pieces.Pawn;
+import chess.model.pieces.Queen;
+import chess.model.pieces.Rook;
+
+public class PieceIcon implements PieceVisitor<String> {
+
+	private static final String basePath = "app/src/main/resources/pieces2D/";
+	private static final Map<String, Icon> cache = new HashMap<>();
+
+	public Icon getIcon(Piece piece) {
+		if (piece == null)
+			return null;
+		String path = basePath + colorToString(piece.getColor()) + "-" + visit(piece) + ".png";
+		return getIcon(path);
+	}
+	
+	private Icon getIcon(String path) {
+		Icon image = cache.get(path);
+		if (image != null)
+			return image;
+		image = new ImageIcon(new ImageIcon(path).getImage().getScaledInstance(100,100, Image.SCALE_SMOOTH)); 
+		cache.put(path, image);
+		return image;
+	}
+
+	private String colorToString(Color color) {
+		return color == Color.Black ? "black" : "white";
+	}
+
+	@Override
+	public String visitPiece(Bishop bishop) {
+		return "bishop";
+	}
+
+	@Override
+	public String visitPiece(King king) {
+		return "king";
+	}
+
+	@Override
+	public String visitPiece(Knight knight) {
+		return "knight";
+	}
+
+	@Override
+	public String visitPiece(Pawn pawn) {
+		return "pawn";
+	}
+
+	@Override
+	public String visitPiece(Queen queen) {
+		return "queen";
+	}
+
+	@Override
+	public String visitPiece(Rook rook) {
+		return "rook";
+	}
+	
+}