PDPoint.java(a small class derived from the AWT class Point)

// PDPoint.java-a special markable point for the PolyDraw program.

import java.awt.*;

public class PDPoint extends Point {

public boolean selected;

private static final int r = 5;

PDPoint(int anX, int aY) {

super(anX, aY);

selected = false;

}

public void mark() { selected = true; }

public void unmark() { selected = false; }

public void paint(Graphics g) {

if (selected) { g.fillOval(x - r, y - r, r+r, r+r); }

}

}

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