transformValues method

Implementation

@override
void transformValues() {
  if (x.isNaN || high.isNaN || low.isNaN || open.isNaN || close.isNaN) {
    return;
  }

  points.clear();

  final PointToPixelCallback transformX = series.pointToPixelX;
  final PointToPixelCallback transformY = series.pointToPixelY;
  final num left = x + series.sbsInfo.minimum;
  final num right = x + series.sbsInfo.maximum;

  final double centerY = (low + high) / 2;
  _isSameValue = high == low;

  final double centerX = (right + left) / 2;
  points.add(Offset(transformX(centerX, high), transformY(centerX, high)));
  points.add(Offset(transformX(centerX, low), transformY(centerX, low)));

  points.add(Offset(transformX(left, open), transformY(left, open)));
  points.add(Offset(transformX(centerX, open), transformY(centerX, open)));

  points.add(Offset(transformX(right, close), transformY(right, close)));
  points.add(Offset(transformX(centerX, close), transformY(centerX, close)));

  if (_isSameValue && series.showIndicationForSameValues) {
    final double x = transformX(centerX, centerY);
    final double y = transformY(centerX, centerY);
    if (series.isTransposed) {
      points.add(Offset(x - 2, y));
      points.add(Offset(x + 2, y));
    } else {
      points.add(Offset(x, y - 2));
      points.add(Offset(x, y + 2));
    }
  }

  if (_oldPoints.isEmpty) {
    final Offset center =
        Offset(transformX(centerX, centerY), transformY(centerX, centerY));
    _oldPoints.add(center);
    _oldPoints.add(center);
    _oldPoints
        .add(Offset(transformX(left, centerY), transformY(left, centerY)));
    _oldPoints.add(center);
    _oldPoints
        .add(Offset(transformX(right, centerY), transformY(right, centerY)));
    _oldPoints.add(center);
  }

  if (points.length > _oldPoints.length) {
    _oldPoints.addAll(points.sublist(_oldPoints.length));
  }
}