public void appendShape(GeneralPath gp, DrawAreaInterface da, UserFunction own)
throws MathException {
AffPoint s, e;
s = (AffPoint) ((UserFunction) startPoint).eval();
e = (AffPoint) ((UserFunction) endPoint).eval();
gp.append(
new Line2D.Double(
da.xCoordToPix(s.evalX()),
da.yCoordToPix(s.evalY()),
da.xCoordToPix(e.evalX()),
da.yCoordToPix(e.evalY())),
true);
}
