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perf: Improved performance of LineChart calculating touched spots #2101

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perf: Improved performance of LineChart calculating touched spots #2101

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18 changes: 10 additions & 8 deletions lib/src/chart/line_chart/line_chart_painter.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -1385,7 +1385,7 @@ class LineChartPainter extends AxisChartPainter<LineChartData> {
}

/// Find the nearest spot (based on distanceCalculator)
final sortedSpots = <FlSpot>[];
FlSpot? nearestSpot;
double? smallestDistance;
for (final spot in barData.spots) {
if (spot.isNull()) continue;
Expand All @@ -1398,22 +1398,24 @@ class LineChartPainter extends AxisChartPainter<LineChartData> {
);

if (distance <= data.lineTouchData.touchSpotThreshold) {
smallestDistance ??= distance;
if (nearestSpot == null) {
nearestSpot = spot;
smallestDistance = distance;
continue;
}

if (distance < smallestDistance) {
sortedSpots.insert(0, spot);
if (distance < smallestDistance!) {
nearestSpot = spot;
smallestDistance = distance;
} else {
sortedSpots.add(spot);
}
}
}

if (sortedSpots.isNotEmpty) {
if (nearestSpot != null) {
return TouchLineBarSpot(
barData,
barDataPosition,
sortedSpots.first,
nearestSpot,
smallestDistance!,
);
} else {
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