copyOldSegmentValues method

Implementation

@override
void copyOldSegmentValues(
  double seriesAnimationFactor,
  double segmentAnimationFactor,
) {
  if (series.animationType == AnimationType.loading) {
    points.clear();
    _oldStartControlX = null;
    _oldStartControlY = null;
    _oldEndControlX = null;
    _oldEndControlY = null;
    _oldPoints.clear();
    return;
  }

  if (series.animationDuration > 0) {
    if (points.isEmpty) {
      _oldPoints.clear();
      return;
    }

    final int newPointsLength = points.length;
    final int oldPointsLength = _oldPoints.length;
    if (oldPointsLength == newPointsLength) {
      for (int i = 0; i < newPointsLength; i++) {
        _oldPoints[i] =
            Offset.lerp(_oldPoints[i], points[i], segmentAnimationFactor)!;
      }
    } else {
      final int minLength = min(oldPointsLength, newPointsLength);
      for (int i = 0; i < minLength; i++) {
        _oldPoints[i] =
            Offset.lerp(_oldPoints[i], points[i], segmentAnimationFactor)!;
      }

      if (newPointsLength > oldPointsLength) {
        _oldPoints.addAll(points.sublist(oldPointsLength));
      } else {
        _oldPoints.removeRange(minLength, oldPointsLength);
      }
    }

    _oldStartControlX = lerpDouble(
      _oldStartControlX,
      startControlX,
      segmentAnimationFactor,
    );
    _oldStartControlY = lerpDouble(
      _oldStartControlY,
      startControlY,
      segmentAnimationFactor,
    );
    _oldEndControlX = lerpDouble(
      _oldEndControlX,
      endControlX,
      segmentAnimationFactor,
    );
    _oldEndControlY = lerpDouble(
      _oldEndControlY,
      endControlY,
      segmentAnimationFactor,
    );
  } else {
    _oldPoints.clear();
  }
}