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);
}
public void DrawPlot(CGContext context, IPointDataSource dataSource, IEnumerable <IPointEntry> highlightedEntries, IViewPort viewPort, IXAxis xAxis, IYAxis yAxis)
{
var visibleSourceRange = VisibleSourceXRange(xAxis, viewPort);
var visibleSourceRangeStart = Math.Floor(visibleSourceRange.Item1);
var visibleSourceRangeEnd = Math.Ceiling(visibleSourceRange.Item2);
if (Style.BezierCurve)
{//для отображения кривых нужны дополнительные точки для рассчета опорных точек
//TODO учитывать масштаб
visibleSourceRangeStart--;
visibleSourceRangeEnd++;
}
var visibleEntries = dataSource.GetEntriesInRange(visibleSourceRangeStart, visibleSourceRangeEnd);
Draw(context, visibleEntries, highlightedEntries, viewPort, xAxis, yAxis, Style);
}