Java How to Program, Early Objects, 11th Edition

... void drawingAreaMouseClicked(MouseEvent e) {
45         polyline.getPoints().addAll(e.getX(), e.getY());
46         polygon.getPoints().addAll(e.getX(), e.getY());
47
48         // if path is empty, move to first click position and close path
49         if (path.getElements().isEmpty()) {
50            path.getElements().add(new MoveTo(e.getX(), e.getY()));
51            path.getElements().add(new ClosePath());
52         }
53         else { // insert a new path segment before the ClosePath element
54            // create an arc segment and insert it in the path
55            ArcTo arcTo = new ArcTo();
56            arcTo.setX(e.getX());
57            arcTo.setY(e.getY());
58            arcTo.setRadiusX(100.0);
59            arcTo.setRadiusY(100.0);
60            arcTo.setSweepFlag(sweepFlag);
61            sweepFlag = !sweepFlag;
62            path.getElements().add(path.getElements().size() - 1, arcTo);
63 }  ...