private static IEnumerable <FrameworkElement> DefaultLegendItemsBuilder(IPlotterElement element)
{
LineChartBase lineChart = (LineChart)element;
Line line = new Line
{
X1 = 0,
Y1 = 10,
X2 = 20,
Y2 = 0,
Stretch = Stretch.Fill,
DataContext = lineChart
};
line.SetBinding(Line.StrokeProperty, "Stroke");
line.SetBinding(Line.StrokeThicknessProperty, "StrokeThickness");
line.SetBinding(Line.StrokeDashArrayProperty, "StrokeDashArray");
Legend.SetVisualContent(lineChart, line);
var legendItem = LegendItemsHelper.BuildDefaultLegendItem(lineChart);
yield return(legendItem);
}
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();
}
}
}
private void CreateAndAddPath(IEnumerable <IndexWrapper <Point> > indexedPoints,
out int globalMinIndex, out int globalMaxIndex, CoordinateTransform transform)
{
var screenPoints = indexedPoints.DataToScreen(transform);
var parts = screenPoints.Split(pathLength);
var splittedParts = from part in parts
select missingValueSplitter.SplitMissingValue(part);
bool isSmoothJoin = UseSmoothJoin;
Point?lastPoint = null;
globalMinIndex = Int32.MaxValue;
globalMaxIndex = Int32.MinValue;
foreach (var shortSegment in splittedParts)
{
foreach (var part in shortSegment)
{
if (part.MinIndex < globalMinIndex)
{
globalMinIndex = part.MinIndex;
}
if (part.MaxIndex > globalMaxIndex)
{
globalMaxIndex = part.MaxIndex;
}
List <Point> list = part.GetPoints().ToList();
if (list.Count == 0)
{
continue;
}
if (part.Splitted)
{
lastPoint = null;
}
StreamGeometry geometry = new StreamGeometry();
using (var context = geometry.Open())
{
var start = lastPoint ?? list[0];
context.BeginFigure(start, isFilled: false, isClosed: false);
context.PolyLineTo(list, isStroked: true, isSmoothJoin: isSmoothJoin);
}
lastPoint = list.Last();
Path path = pathsPool.GetOrCreate();
drawnPaths.Add(path);
PointChartBase.SetIndexRange(path, new Range <int>(part.MinIndex, part.MaxIndex));
LineChartBase.SetPointsCount(path, list.Count);
DataRect localBounds = list.GetBounds();
PointChartBase.SetContentBounds(path, localBounds);
//if (path.CacheMode == null)
// path.CacheMode = new BitmapCache();
// todo for debug purpose
//path.Stroke = ColorHelper.RandomBrush;
path.SetBinding(Path.StrokeProperty, strokeBinding);
path.SetBinding(Path.StrokeThicknessProperty, strokeThicknessBinding);
path.SetBinding(Path.StrokeDashArrayProperty, strokeDashArrayBinding);
path.SetBinding(Panel.ZIndexProperty, zIndexBinding);
path.SetBinding(Path.IsHitTestVisibleProperty, isHitTestVisibleBinding);
path.SetBinding(Path.VisibilityProperty, visibilityBinding);
path.SetBinding(Path.ToolTipProperty, tooltipBinding);
path.Data = geometry;
canvas.Children.Add(path);
}
}
}
private static void OnYMissingValueReplaced(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
LineChartBase owner = (LineChartBase)d;
// todo some notification logic here
}