public static IEnumerable<Point> GetPoints(IPointDataSource dataSource, DependencyObject context)
{
if (dataSource == null)
throw new ArgumentNullException("dataSource");
if (context == null)
context = new DataSource2dContext();
using (IPointEnumerator enumerator = dataSource.GetEnumerator(context))
{
Point p = new Point();
while (enumerator.MoveNext())
{
enumerator.GetCurrent(ref p);
yield return p;
p = new Point();
}
}
}
private void UpdateUIRepresentation()
{
if (isUpdating)
{
return;
}
if (plotter == null)
{
return;
}
IPointDataSource dataSource = DataSource;
if (dataSource == null)
{
return;
}
visibleWhileUpdate = plotter.Viewport.Visible;
isUpdating = true;
panel.Children.Clear();
DependencyObject dependencyDataSource = dataSource as DependencyObject;
if (dependencyDataSource != null)
{
DataSource2dContext.SetVisibleRect(dependencyDataSource, plotter.Viewport.Visible);
DataSource2dContext.SetScreenRect(dependencyDataSource, plotter.Viewport.Output);
}
IEnumerable <Point> viewportPoints = dataSource;
var transform = plotter.Viewport.Transform;
if (!(transform.DataTransform is IdentityTransform))
{
viewportPoints = dataSource.DataToViewport(transform.DataTransform);
}
var screenPoints = viewportPoints.ViewportToScreen(transform);
var filteredPoints = filters.Filter(screenPoints, plotter.Viewport);
DataRect bounds = DataRect.Empty;
double strokeThickness = 3;
bool first = true;
Point lastPointOfPrevLine = new Point();
int overallCount = 0;
panel.BeginBatchAdd();
const int ptsInPolyline = 500;
foreach (var pointGroup in filteredPoints.Split(ptsInPolyline))
{
int ptsCount = ptsInPolyline;
if (!first)
{
ptsCount++;
}
PointCollection pointCollection = new PointCollection(ptsCount);
if (!first)
{
pointCollection.Add(lastPointOfPrevLine);
}
else
{
first = false;
}
pointCollection.AddMany(pointGroup);
overallCount += pointCollection.Count - 1;
if (pointCollection.Count == 0)
{
break;
}
lastPointOfPrevLine = pointCollection[pointCollection.Count - 1];
pointCollection.Freeze();
DataRect ithBounds = BoundsHelper.GetViewportBounds(pointCollection.ScreenToViewport(transform));
#if geom
UIElement line = null;
StreamGeometry geometry = new StreamGeometry();
using (var dc = geometry.Open())
{
dc.BeginFigure(pointCollection[0], false, false);
dc.PolyLineTo(pointCollection, true, false);
}
geometry.Freeze();
GeometryDrawing drawing = new GeometryDrawing {
Geometry = geometry, Pen = new Pen(Brushes.Blue, 1)
};
drawing.Freeze();
DrawingBrush brush = new DrawingBrush {
Drawing = drawing
};
brush.Freeze();
var rectangle = new Rectangle {
Fill = brush, IsHitTestVisible = false
};
Rect ithScreenBounds = ithBounds.ViewportToScreen(transform);
if (true || ithScreenBounds.Width > 2000 || ithScreenBounds.Height > 2000 || ithScreenBounds.Width < 1 || ithScreenBounds.Height < 1)
{
line = rectangle;
}
else
{
Size intSize = new Size((int)ithScreenBounds.Width, (int)ithScreenBounds.Height);
rectangle.Measure(intSize);
rectangle.Arrange(new Rect(intSize));
RenderTargetBitmap renderBitmap = new RenderTargetBitmap((int)ithScreenBounds.Width, (int)ithScreenBounds.Height, 96, 96, PixelFormats.Pbgra32);
renderBitmap.Render(rectangle);
renderBitmap.Freeze();
line = new Image {
Source = renderBitmap
};
}
#else
var line = CreateLine();
line.Points = pointCollection;
#endif
bounds.Union(ithBounds);
ViewportRectPanel.SetViewportBounds(line, ithBounds);
#if !geom
ViewportMarginPanel.SetScreenMargin(line, new Size(strokeThickness / 2, strokeThickness / 2));
#endif
panel.Children.Add(line);
isUpdating = false;
}
panel.EndBatchAdd();
Debug.WriteLine("OverallCount = " + (overallCount + 1));
Viewport2D.SetContentBounds(this, bounds);
isUpdating = false;
}