DrawCanvas.java (mousePressed -- handling “Poly” mode)

public void mousePressed(MouseEvent e) {

int x = e.getX(); int y = e.getY();

if (ct.usingGrid()) {

x = snapToGrid(x); y = snapToGrid(y);

}

String currentTool = pd.getToolbar().whichTool();

if (currentTool.equals("Poly")) {

if (currentObject == null) return;

Polygon thisPoly = (Polygon)currentObject;

if (thisPoly.lastVertexNotAt(x, y))

thisPoly.addVertex(new PDPoint(x, y));

}

else { ... }

repaint();

}