public LineBuilder(Expression expr, Window window, double xScale, double yScale, double increment)
{
Expression = expr;
Window = window;
XScale = xScale;
YScale = yScale;
Increment = increment;
_workingPointList = new List<PointD>();
_workingSegmentList = new List<IList<PointD>>();
}
private CalculatedLine CalculateLine(Expression expr)
{
CalculatedLine line;
try
{
switch (expr.Type)
{
case ExpressionType.Linear:
line =
LinearLineCalculator.Calculate(
(StandardExpression)expr,
Calculator,
_window,
DisplayRectangle.Width,
XScale,
YScale,
_resolution);
break;
case ExpressionType.Polar:
line =
_polarCalc.Calculate(
(StandardExpression)expr,
Calculator,
_window,
XScale,
YScale);
break;
case ExpressionType.Parametric:
line =
_paraCalc.Calculate(
(ParametricExpression)expr,
Calculator,
_window,
XScale,
YScale);
break;
default:
throw new NotSupportedException("Type not implemented.");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
var calculatedLine = new LineBuilder(expr, Window, XScale, YScale, 0);
return calculatedLine.SealLine();
}
return line;
}
private void OnSelectClick(object sender, EventArgs e)
{
var selected =
_checkables.
Where(b => b.Checked).
Select(b => (Expression)b.Tag).
SingleOrDefault();
if (selected == null)
{
// Shouldn't happen, since we set the first expression to checked in the
// constructor and a radio button can't be unchecked, but might as well include this
MessageBox.Show(
"You must select an expression to continue.",
"Expression Not Selected",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
return;
}
if (radioManualBounds.Checked)
{
if (string.IsNullOrEmpty(textboxLeftBound.Text))
{
MessageBox.Show("You must provide a value for the left bound before continuing.",
"Left Bound Missing",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
return;
}
if (string.IsNullOrEmpty(textboxRightBound.Text))
{
MessageBox.Show("You must provide a value for the right bound before continuing.",
"Right Bound Missing",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
return;
}
double? leftBound, rightBound;
if ((leftBound = ParseBound("left", textboxLeftBound.Text)) == null ||
(rightBound = ParseBound("right", textboxRightBound.Text)) == null)
{
return;
}
if (rightBound < leftBound)
{
MessageBox.Show("The left bound must be less than the right bound.",
"Right Bound Greater than Left",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
return;
}
LeftBound = leftBound;
RightBound = rightBound;
ManualBoundSpecified = true;
}
SelectedExpression = selected;
DialogResult = DialogResult.OK;
Close();
}