1 files changed, 64 insertions, 0 deletions
diff --git a/docs/teaching/exercises/figures/Line.java b/docs/teaching/exercises/figures/Line.java
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+++ b/docs/teaching/exercises/figures/Line.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 Line extends ShapeFigureElement {
+    private Point _p1;
+    private Point _p2;
+
+    public Line(Point p1, Point p2) {
+        _p1 = p1;
+        _p2 = p2;
+    }
+
+    public Point getP1() { return _p1; }
+    public Point getP2() { return _p2; }
+
+    public void move(int dx, int dy) {
+        _p1.move(dx, dy);
+        _p2.move(dx, dy);
+    }
+
+    public String toString() {
+        return "Line(" + _p1 + ", " + _p2 + ")";
+    }
+
+    /**
+     * Used to determine if this line {@link contains(Point2D)} a point.
+     */
+    final static int THRESHHOLD = 5;
+
+    /**
+     * Returns <code>true</code> if the point segment distance is less than
+     * {@link THRESHHOLD}.
+     */
+    public boolean contains(Point2D p) {
+        return getLine2D().ptLineDist(p) < THRESHHOLD;
+    }
+
+    private Line2D getLine2D() {
+	return new Line2D.Float((float)getP1().getX(),
+                                (float)getP1().getY(),
+                                (float)getP2().getX(),
+                                (float)getP2().getY());
+    }
+
+    public Shape getShape() {
+        return getLine2D();
+    }
+}
+