getNearestDatumDetailPerSeries method
Retrieves the datum details that are nearest to the given drawAreaPoint
.
drawAreaPoint
represents a point in the chart, such as a point that was
clicked/tapped on by a user.
selectAcrossAllDrawAreaComponents
specifies whether nearest data
selection should be done across the combined draw area of all components
with series draw areas, or just the chart's primary draw area bounds.
Implementation
List<DatumDetails<D>> getNearestDatumDetailPerSeries(
Point<double> drawAreaPoint,
bool selectAcrossAllDrawAreaComponents,
) {
// Optionally grab the combined draw area bounds of all components. If this
// is disabled, then we expect each series renderer to filter out the event
// if [chartPoint] is located outside of its own component bounds.
final boundsOverride =
selectAcrossAllDrawAreaComponents ? drawableLayoutAreaBounds : null;
final details = <DatumDetails<D>>[];
for (final rendererId in _usingRenderers) {
details.addAll(
getSeriesRenderer(rendererId).getNearestDatumDetailPerSeries(
drawAreaPoint,
selectNearestByDomain,
boundsOverride,
selectOverlappingPoints: selectOverlappingPoints,
selectExactEventLocation: selectExactEventLocation,
),
);
}
details.sort((a, b) {
// Sort so that the nearest one is first.
// Special sort, sort by domain distance first, then by measure distance.
if (selectNearestByDomain) {
final domainDiff = a.domainDistance!.compareTo(b.domainDistance!);
if (domainDiff == 0) {
return a.measureDistance!.compareTo(b.measureDistance!);
}
return domainDiff;
} else {
return a.relativeDistance!.compareTo(b.relativeDistance!);
}
});
return details;
}