public void Reset(MathExpression ex)
{
expression = ex;
Is3D = ex.ContainsVariable("z");
IsDensityPlot = expression.ExpressionStack.Peek() is Density;
IsImplicit = ex.IsImplicit;
if (IsImplicit)
implicitdata = new List<Vector2>();
timer = new Stopwatch();
timer.Start();
Visible = true;
InvalidateVBO();
IsLocked = false;
}
