public void perform_1(final Context context, double xvalue, double yvalue)
throws LogoException {
Turtle turtle = (Turtle) context.agent;
try {
turtle.xandycor(turtle.shortestPathX(xvalue),
turtle.shortestPathY(yvalue));
} catch (org.nlogo.api.AgentException e) {
throw new EngineException(context, this,
I18N.errorsJ().getN("org.nlogo.prim.etc._setxy.pointOutsideWorld", xvalue, yvalue));
}