1 files changed, 64 insertions, 0 deletions
diff --git a/docs/teaching/exercises/figures/Box.java b/docs/teaching/exercises/figures/Box.java
new file mode 100644
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+++ b/docs/teaching/exercises/figures/Box.java
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+/* *******************************************************************
+ * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
+ * All rights reserved. 
+ * This program and the accompanying materials are made available 
+ * under the terms of the Common Public License v1.0 
+ * which accompanies this distribution and is available at 
+ * http://www.eclipse.org/legal/cpl-v10.html 
+ *  
+ * Contributors: 
+ *     PARC     initial implementation 
+ * ******************************************************************/
+
+
+package figures;
+
+import java.awt.*;
+import java.awt.geom.*;
+
+public class Box extends ShapeFigureElement {
+    private Point _p0;
+    private Point _p1;
+    private Point _p2;
+    private Point _p3;
+
+    public Box(int x0, int y0, int width, int height) {
+        _p0 = new Point(x0, y0);
+        _p1 = new Point(x0+width, y0);
+        _p2 = new Point(x0+width, y0+height);
+        _p3 = new Point(x0, y0+height);
+    }
+
+    public Point getP0() { return _p0; }
+    public Point getP1() { return _p1; }
+    public Point getP2() { return _p2; }
+    public Point getP3() { return _p3; }
+
+    public void move(int dx, int dy) {
+        _p0.move(dx, dy);
+        _p1.move(dx, dy);
+        _p2.move(dx, dy);
+        _p3.move(dx, dy);
+    }
+
+    public void checkBoxness() {
+        if ((_p0.getX() == _p3.getX()) &&
+            (_p1.getX() == _p2.getX()) &&
+            (_p0.getY() == _p1.getY()) &&
+            (_p2.getY() == _p3.getY()))
+          return;
+        throw new IllegalStateException("This is not a square.");
+    }
+
+    public String toString() {
+        return "Box(" + _p0 + ", " + _p1 + ", " + _p2 + ", " + _p3 + ")";
+    }
+
+    public Shape getShape() {
+        return new Rectangle(getP1().getX(),
+                             getP1().getY(),
+                             getP3().getX() - getP1().getX(),
+                             getP3().getY() - getP1().getY());
+    }
+}
+