/// <summar
/// Ensures that ISeriesHost is in a consistent state when axes collection is
/// changed.
/// </summary>
/// <param name="sender">Event source.</param>
/// <param name="e">Event arguments.</param>
private void OnAxesCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null)
{
foreach (IAxis axis in e.NewItems)
{
if (!InternalActualAxes.Contains(axis))
{
InternalActualAxes.Add(axis);
}
}
}
if (e.OldItems != null)
{
foreach (IAxis axis in e.OldItems)
{
if (!axis.IsUsed)
{
InternalActualAxes.Remove(axis);
}
else
{
throw new InvalidOperationException(Properties.Resources.Chart_OnAxesCollectionChanged_AnAxisCannotBeRemovedFromTheChartWhenItIsInUseByAnObject);
}
}
}
NotifyCollectionChangedEventHandler handler = AxesChanged;
if (handler != null)
{
handler(sender, e);
}
}
/// <summary>
/// Signals to the ISeriesHost that a series would like to use an axis.
/// </summary>
/// <param name="series">The series that would like to use the axis.
/// </param>
/// <param name="axis">The axis the series would like to use.</param>
void ISeriesHost.RegisterWithAxis(Series series, IAxis axis)
{
if (series == null)
{
throw new ArgumentNullException("series");
}
if (axis == null)
{
throw new ArgumentNullException("axis");
}
axis.Register(series);
if (!InternalActualAxes.Contains(axis))
{
InternalActualAxes.Add(axis);
}
}
/// <summary>
/// Determines the location of an axis based on the existing axes in
/// the chart.
/// </summary>
/// <param name="axis">The axis to determine the location of.</param>
/// <returns>The location of the axis.</returns>
private AxisLocation GetAutoAxisLocation(Axis axis)
{
if (axis.Orientation == AxisOrientation.X)
{
int numberOfTopAxes = InternalActualAxes.OfType <Axis>().Where(currentAxis => currentAxis.Location == AxisLocation.Top).Count();
int numberOfBottomAxes = InternalActualAxes.OfType <Axis>().Where(currentAxis => currentAxis.Location == AxisLocation.Bottom).Count();
return((numberOfBottomAxes > numberOfTopAxes) ? AxisLocation.Top : AxisLocation.Bottom);
}
else if (axis.Orientation == AxisOrientation.Y)
{
int numberOfLeftAxes = InternalActualAxes.OfType <Axis>().Where(currentAxis => currentAxis.Location == AxisLocation.Left).Count();
int numberOfRightAxes = InternalActualAxes.OfType <Axis>().Where(currentAxis => currentAxis.Location == AxisLocation.Right).Count();
return((numberOfLeftAxes > numberOfRightAxes) ? AxisLocation.Right : AxisLocation.Left);
}
else
{
return(AxisLocation.Auto);
}
}
/// <summary>
/// Signals to the Chart that a Series no longer needs to use the axis
/// within this series host.
/// </summary>
/// <param name="series">The Series object that no longer needs to use
/// the axis.</param>
/// <param name="axis">The axis that the Series no longer needs to use.
/// </param>
void ISeriesHost.UnregisterWithAxis(Series series, IAxis axis)
{
if (series == null)
{
throw new ArgumentNullException("series");
}
if (axis == null)
{
throw new ArgumentNullException("axis");
}
if (!ActualAxes.Contains(axis))
{
throw new InvalidOperationException(Properties.Resources.Chart_UnregisterWithSeries_OneAxisCannotBeUsedByMultipleCharts);
}
axis.Unregister(series);
// If axis is no longer used and is not in external axes collection
if (!axis.IsUsed && !Axes.Contains(axis))
{
InternalActualAxes.Remove(axis);
}
}
