private void UpdateUIRepresentation()
{
if (Plotter == null)
{
return;
}
PointsGraphBase source = this.PointSource;
if (source == null || (source != null && source.VisiblePoints == null))
{
SetValue(MarkerPositionPropertyKey, new Point(Double.NaN, Double.NaN));
marker.Visibility = Visibility.Hidden;
return;
}
else
{
Point mousePos = Mouse.GetPosition(Plotter.CentralGrid);
var transform = Plotter.Transform;
Point viewportPos = mousePos.ScreenToViewport(transform);
double x = viewportPos.X;
searchResult = searcher.SearchXBetween(x, searchResult);
SetValue(ClosestPointIndexPropertyKey, searchResult.Index);
if (!searchResult.IsEmpty)
{
marker.Visibility = Visibility.Visible;
IList <Point> points = source.VisiblePoints;
Point ptBefore = points[searchResult.Index];
Point ptAfter = points[searchResult.Index + 1];
double ratio = (x - ptBefore.X) / (ptAfter.X - ptBefore.X);
double y = ptBefore.Y + (ptAfter.Y - ptBefore.Y) * ratio;
Point temp = new Point(x, y);
SetX(marker, temp.X);
SetY(marker, temp.Y);
Point markerPosition = temp;
followDataContext.Position = markerPosition;
SetValue(MarkerPositionPropertyKey, markerPosition);
}
else
{
SetValue(MarkerPositionPropertyKey, new Point(Double.NaN, Double.NaN));
marker.Visibility = Visibility.Hidden;
}
}
}
/// <summary>
/// Generates ticks for given range and preferred ticks count.
/// </summary>
/// <param name="range">The range.</param>
/// <param name="ticksCount">The ticks count.</param>
/// <returns></returns>
public ITicksInfo <TAxis> GetTicks(Range <TAxis> range, int ticksCount)
{
EnsureSearcher();
//minResult = searcher.SearchBetween(range.Min, minResult);
//maxResult = searcher.SearchBetween(range.Max, maxResult);
minResult = searcher.SearchFirstLess(range.Min);
maxResult = searcher.SearchGreater(range.Max);
if (!(minResult.IsEmpty && maxResult.IsEmpty))
{
int startIndex = !minResult.IsEmpty ? minResult.Index : 0;
int endIndex = !maxResult.IsEmpty ? maxResult.Index : collection.Count - 1;
int count = endIndex - startIndex + 1;
TAxis[] ticks = new TAxis[count];
for (int i = startIndex; i <= endIndex; i++)
{
ticks[i - startIndex] = axisMapping(collection[i]);
}
TicksInfo <TAxis> result = new TicksInfo <TAxis>
{
Info = startIndex,
TickSizes = ArrayExtensions.CreateArray(count, 1.0),
Ticks = ticks
};
return(result);
}
else
{
return(TicksInfo <TAxis> .Empty);
}
}
