/// <summary>
/// Handles the <see cref="NumericUpDown.ValueChanged"/> event for the "Side Length" <see
/// cref="NumericUpDown"/> control on the <see cref="StructureTab"/> page.</summary>
/// <param name="sender">
/// The <see cref="NumericUpDown"/> control sending the event.</param>
/// <param name="args">
/// An <see cref="EventArgs"/> object containing event data.</param>
/// <remarks>
/// <b>OnLengthChanged</b> resizes the <see cref="PolygonGrid.Element"/> of the <see
/// cref="MapGrid"/> to the value of the "Side Length" control, and sets the <see
/// cref="DataChanged"/> flag if the value has changed.</remarks>
private void OnLengthChanged(object sender, EventArgs args)
{
if (this._ignoreEvents)
{
return;
}
// get new polygon side length
double length = (float)LengthUpDown.Value;
RegularPolygon element = MapGrid.Element;
// create polygon with new side length if changed
if (length != element.Length)
{
this._mapGrid.Element = element.Resize(length);
// broadcast data changes
DataChanged = true;
}
}