help

chess/src/chess/Board.java

@@ -1,7 +1,6 @@
 package chess;
 
 import java.awt.Color;
-import java.awt.Rectangle;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;
@@ -72,10 +71,18 @@ class Board {
 
     // Show the moves a piece can take.
     void displayMoves(Coord coord) {
-        ArrayList<Coord> moves = this.get(coord).moves(coord);
+        Piece piece = this.get(coord);
+        if (piece == null) return;
+        ArrayList<Coord> moves = piece.moves(coord);
         for (Coord move : moves) this.info.put(move, Info.CANMOVE);
     }
 
+    // Clear moves from screen.
+    void undisplayMoves(Coord coord) {
+        ArrayList<Coord> moves = this.get(coord).moves(coord);
+        for (Coord move : moves) this.info.remove(move);
+    }
+
     // Show which piece is selected.
     void displaySelected(Coord coord) { this.info.put(coord, Info.SELECTED); }
 

chess/src/chess/Game.java

@@ -115,5 +115,5 @@ class Game extends World {
         this.activeActor.click(this.where(posn));
     }
 
-    public void onKey(String key) { this.activeActor.key(key); }
+    public void onKeyEvent(String key) { this.activeActor.key(key); }
 }

chess/src/chess/Player.java

@@ -1,15 +1,45 @@
 package chess;
 
-// A human-controlled Actor.
+import java.util.ArrayList;
+
+// A human-controlled Actor."
 class Player extends Actor {
     Coord selected; // The currently selected piece.
 
     Player(Util.Col col, Board board) { super(col, board); }
 
     void click(Coord coord) {
+        if (this.board.get(coord) == null) {
+            this.board.unselect(this.selected);
+            this.board.undisplayMoves(this.selected);
+            this.selected = null;
+            return;
+        };
+
+        // Click while something selected.
+        if (this.selected != null) {
+            // Click on same piece -- unselect.
+            if (this.selected.equals(coord)) {
+
+            } else if (this.board.getMoves(this.selected).contains(coord)) {
+                System.out.println("HHHHHHHHHHERE");
+                this.board.move(this.selected, coord);
+            }
+            this.board.unselect(this.selected);
+            this.board.undisplayMoves(this.selected);
+            this.selected = null;
+            return;
+        } else {
             this.selected = coord;
             this.board.displaySelected(this.selected);
             this.board.displayMoves(this.selected);
+            return;
+        }
+    }
+
+    void key(String key) {
+        this.board.undisplayMoves(this.selected);
+        this.board.unselect(this.selected);
+        this.selected = null;
     }
-    void key(String key) { this.board.unselect(this.selected); }
 }