/// <summary>
/// Create a URL for a <see cref="CurveItem" /> that includes the index of the
/// point that was selected.
/// </summary>
/// <remarks>
/// An "index" parameter is added to the <see cref="Url" /> property for this
/// link to indicate which point was selected. Further, if the
/// X or Y axes that correspond to this <see cref="CurveItem" /> are of
/// <see cref="AxisType.Text" />, then an
/// additional parameter will be added containing the text value that
/// corresponds to the <paramref name="index" /> of the selected point.
/// The <see cref="XAxis" /> text parameter will be labeled "xtext", and
/// the <see cref="YAxis" /> text parameter will be labeled "ytext".
/// </remarks>
/// <param name="index">The zero-based index of the selected point</param>
/// <param name="pane">The <see cref="GraphPane" /> of interest</param>
/// <param name="curve">The <see cref="CurveItem" /> for which to
/// make the url string.</param>
/// <returns>A string containing the url with an index parameter added.</returns>
public virtual string MakeCurveItemUrl( GraphPane pane, CurveItem curve, int index )
{
string url = _url;
if ( url.IndexOf( '?' ) >= 0 )
url += "&index=" + index.ToString();
else
url += "?index=" + index.ToString();
Axis xAxis = curve.GetXAxis( pane );
if ( xAxis.Type == AxisType.Text && index >= 0 &&
xAxis.Scale.TextLabels != null &&
index <= xAxis.Scale.TextLabels.Length )
url += "&xtext=" + xAxis.Scale.TextLabels[index];
Axis yAxis = curve.GetYAxis( pane );
if ( yAxis != null && yAxis.Type == AxisType.Text && index >= 0 &&
yAxis.Scale.TextLabels != null &&
index <= yAxis.Scale.TextLabels.Length )
url += "&ytext=" + yAxis.Scale.TextLabels[index];
return url;
}
