private void CreateUIRepresentation()
{
if (Plotter == null)
{
return;
}
if (DataSource == null)
{
return;
}
drawnPaths.Clear();
DataSourceEnvironment environment = CreateEnvironment();
var points = DataSource.GetPoints(environment);
var indexedPoints = IndexWrapper.Generate(points);
// do nothing if there is nothing to draw
if (!points.Any())
{
return;
}
transformWhileCreateUI = Plotter.Viewport.Transform;
int globalMinIndex;
int globalMaxIndex;
CreateAndAddPath(indexedPoints, out globalMinIndex, out globalMaxIndex, transformWhileCreateUI);
indexRange = new Range <int>(globalMinIndex, globalMaxIndex);
ViewportPanel.SetViewportBounds(canvas, Plotter.Viewport.Visible);
// switching off content bounds calculation for children of ViewportHostPanel.
panel.BeginBatchAdd();
if (canvas.Parent == null)
{
panel.Children.Add(canvas);
}
if (panel.Plotter == null)
{
Plotter.Dispatcher.BeginInvoke(() =>
{
if (panel.Plotter == null && Plotter != null)
{
Plotter.Children.Add(panel);
}
});
}
DataRect bounds = DataRect.Empty;
if (environment.ContentBounds != null)
{
bounds = environment.ContentBounds.Value;
}
else
{
// todo is this necessary?
bounds = points.GetBounds();
}
Viewport2D.SetContentBounds(this, bounds);
}
protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
base.OnCollectionChanged(e);
// todo temp
HandleCollectionReset();
return;
if (e.Action == NotifyCollectionChangedAction.Reset)
{
HandleCollectionReset();
}
else if (e.Action == NotifyCollectionChangedAction.Add)
{
if (e.NewItems != null)
{
Range <int> addedRange = e.GetAddedRange();
if (indexRange.IntersectsWith(addedRange))
{
HandleCollectionAdd(e);
}
else if (indexRange.Max == addedRange.Min - 1) // item was added into the end of collection
{
Path lastPath = drawnPaths.Last();
int lastCount = LineChartBase.GetPointsCount(lastPath);
Range <int> requestRange = new Range <int>(addedRange.Min - 1, addedRange.Max);
// have path with non-filled geometry
if (lastCount + addedRange.GetLength() <= pathLength)
{
canvas.Children.Remove(lastPath);
drawnPaths.Remove(lastPath);
pathsPool.Put(lastPath);
Range <int> lastPathRange = PointChartBase.GetIndexRange(lastPath);
int min = requestRange.Min;
if (min % pathLength == 0)
{
min -= 1;
}
requestRange = new Range <int>(min, addedRange.Max);
}
var points = DataSource.GetPointData(requestRange);
var indexedPoints = IndexWrapper.Generate(points, requestRange.Min);
// do nothing if there is nothing to draw
if (!points.Any())
{
return;
}
int minIndex;
int maxIndex;
CreateAndAddPath(indexedPoints, out minIndex, out maxIndex, transformWhileCreateUI);
this.indexRange = new Range <int>(indexRange.Min, maxIndex);
}
else
{
// todo
// do nothing?
}
}
else
{
HandleCollectionReset();
}
}
}
protected override IEnumerable GetDataCore()
{
return(Filters.Filter(IndexWrapper.Generate(collection), Environment));
}
