rangeBetween static method

ChartRange? rangeBetween(ChartScene scene, double startX, double endX)

The inclusive column range spanned by a drag from pixel x startX to endX, with every mark inside it. Returns null for an empty scene.

Implementation

static ChartRange? rangeBetween(
  ChartScene scene,
  double startX,
  double endX,
) {
  if (scene.isEmpty) return null;
  final a = nearestIndexAtX(scene, math.min(startX, endX));
  final b = nearestIndexAtX(scene, math.max(startX, endX));
  if (a == null || b == null) return null;
  final lo = math.min(a, b);
  final hi = math.max(a, b);
  return ChartRange(
    startIndex: lo,
    endIndex: hi,
    marks: [
      for (final m in scene.marks)
        if (m.index >= lo && m.index <= hi) m,
    ],
  );
}