public void translate(double vx, double vy) {
// translate x
if (!Kernel.isZero(vx)) {
translateX(expression, vx, 0);
}
if (!Kernel.isZero(vy)) {
translateX(expression, vy, 1);
}
// make sure that expression object is changed!
// this is needed to know that the expression has changed
if (expression.isLeaf() && expression.getLeft().isExpressionNode()) {
expression = new ExpressionNode((ExpressionNode) expression.getLeft());
} else {
expression = new ExpressionNode(expression);
}
}
