private void OnCalculateValueClick(object sender, EventArgs e)
{
var exprs = graph.GraphedExpressions;
if (exprs.Count == 0)
{
MessageBox.Show(
"You must graph at least one expression before using this command.",
"A Linear Expression is Required",
MessageBoxButtons.OK,
MessageBoxIcon.Error,
MessageBoxDefaultButton.Button1);
return;
}
using (SelectValue form = new SelectValue(graph.Calculator, exprs))
{
if (form.ShowDialog() == DialogResult.OK)
{
graph.ShowLineValue(form.SelectedExpression.Slot, form.SelectedValue);
}
}
}
private void OnCalculateDerivativeClick(object sender, EventArgs e)
{
var exprs = (from expr in graph.GraphedExpressions
where expr.Type == ExpressionType.Linear
select (StandardExpression)expr).ToList();
if (exprs.Count == 0)
{
MessageBox.Show(
"You must graph at least one linear expression before using this command.",
"A Linear Expression is Required",
MessageBoxButtons.OK,
MessageBoxIcon.Error,
MessageBoxDefaultButton.Button1);
return;
}
using (SelectValue value = new SelectValue(graph.Calculator, exprs))
{
if (value.ShowDialog() == DialogResult.OK)
{
graph.ShowDerivative(value.SelectedExpression.Slot, value.SelectedValue);
}
}
}