public void calculatePath() {
path = new Path2D.Double();
path.moveTo(xpoints[0], ypoints[0]);
for (int i = 1; i < npoints; i++) path.lineTo(xpoints[i], ypoints[i]);
bounds = path.getBounds2D();
}
@Override
public Rectangle2D getBounds2D() {
return shape.getBounds2D();
}