/// <summary>
/// Gets the nearest tracker hit.
/// </summary>
/// <param name="series">The series.</param>
/// <param name="point">The point.</param>
/// <param name="snap">Snap to points.</param>
/// <param name="pointsOnly">Check points only (no interpolation).</param>
/// <returns>A tracker hit result.</returns>
private static TrackerHitResult GetNearestHit(Series.Series series, ScreenPoint point, bool snap, bool pointsOnly)
{
if (series == null)
{
return(null);
}
// Check data points only
if (snap || pointsOnly)
{
var result = series.GetNearestPoint(point, false);
if (result != null)
{
if (result.Position.DistanceTo(point) < 20)
{
return(result);
}
}
}
// Check between data points (if possible)
if (!pointsOnly)
{
var result = series.GetNearestPoint(point, true);
return(result);
}
return(null);
}
/// <summary>
/// Gets the nearest tracker hit.
/// </summary>
/// <param name="series">The series.</param>
/// <param name="point">The point.</param>
/// <param name="snap">Snap to points.</param>
/// <param name="pointsOnly">Check points only (no interpolation).</param>
/// <param name="firesDistance">The distance from the series at which the tracker fires</param>
/// <param name="checkDistanceBetweenPoints">The value indicating whether to check distance
/// when showing tracker between data points.</param>
/// <remarks>
/// <paramref name="checkDistanceBetweenPoints" /> is ignored if <paramref name="pointsOnly"/> is equal to <c>False</c>.
/// </remarks>
/// <returns>A tracker hit result.</returns>
public static TrackerHitResult GetNearestHit(
Series.Series series,
ScreenPoint point,
bool snap,
bool pointsOnly,
double firesDistance,
bool checkDistanceBetweenPoints)
{
if (series == null)
{
return(null);
}
// Check data points only
if (snap || pointsOnly)
{
var result = series.GetNearestPoint(point, false);
if (ShouldTrackerOpen(result, point, firesDistance))
{
return(result);
}
}
// Check between data points (if possible)
if (!pointsOnly)
{
var result = series.GetNearestPoint(point, true);
if (!checkDistanceBetweenPoints || ShouldTrackerOpen(result, point, firesDistance))
{
return(result);
}
}
return(null);
}