public bool Tap(CGPoint tapContentLocation, IChartView chartView, IPointDataSource pointDataSource, IPointHighlightHandler highlightHandler, IXAxis xAxis, IYAxis yAxis)
{
double sourcePositionStart = xAxis.GetSourceValue(tapContentLocation.X - TapDistance);
var sourcePositionEnd = xAxis.GetSourceValue(tapContentLocation.X + TapDistance);
var entriesInTapRange = pointDataSource
.GetEntriesInRange(sourcePositionStart, sourcePositionEnd)
.Select((IPointEntry entry) => new { Entry = entry, Distance = GetDistance(tapContentLocation, entry, xAxis, yAxis) })
.Where((t) => t.Distance <= TapDistance)
.OrderBy(p => p.Distance);
var entryNearestToTap = entriesInTapRange.FirstOrDefault();
if (entryNearestToTap != null)
{
highlightHandler.TapOnEntries(Multiselect ? entriesInTapRange.Select(t => t.Entry) : new List <IPointEntry> {
entryNearestToTap.Entry
});
}
else
{
highlightHandler.TapOnNoEntry();
}
return(entryNearestToTap != null);
}
protected virtual void DrawLabels(CGContext context, IViewPort viewPort, IXAxis xAxis, nfloat axisLineStart, nfloat axisLineEnd, nfloat axisYPosition, TextStyle textStyle)
{
var visibleSourceRangeStart = Math.Floor(xAxis.GetSourceValue(viewPort.ViewPortContentOffset.X));
var visibleSourceRangeEnd = Math.Ceiling(xAxis.GetSourceValue(viewPort.ViewPortContentOffset.X + viewPort.ViewPortSize.Width));
var labels = new List <Tuple <double, string> >();
for (double i = visibleSourceRangeStart; i <= visibleSourceRangeEnd; i += Step)
{
var text = ValueFormatter(i);
if (!string.IsNullOrEmpty(text))
{
labels.Add(new Tuple <double, string>(i, text));
}
}
DrawLabels(context, viewPort, xAxis, axisYPosition, axisLineStart, axisLineEnd, textStyle, labels);
}
protected Tuple <double, double> VisibleSourceXRange(IXAxis xAxis, IViewPort viewPort) => new Tuple <double, double>(xAxis.GetSourceValue(viewPort.ViewPortContentOffset.X), xAxis.GetSourceValue(viewPort.ViewPortContentOffset.X + viewPort.ViewPortSize.Width));