transformValues method

@override void transformValues()

Transforms the x and y values to screen coordinates.

Implementation

@override
void transformValues() {
  if (x.isNaN || top.isNaN || bottom.isNaN || high.isNaN || low.isNaN) {
    segmentRect = null;
    _oldSegmentRect = null;
    _oldPoints.clear();
    points.clear();
    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 centerX = (right + left) / 2;
  double centerY = (top + bottom) / 2;

  final double x1 = transformX(left, top);
  final double y1 = transformY(left, top);
  final double x2 = transformX(right, bottom);
  final double y2 = transformY(right, bottom);
  segmentRect = Rect.fromLTRB(x1, y1, x2, y2);
  _oldSegmentRect ??= Rect.fromLTRB(
    series.pointToPixelX(left, centerY),
    series.pointToPixelY(left, centerY),
    series.pointToPixelX(right, centerY),
    series.pointToPixelY(right, centerY),
  );

  _isSameValue = top == bottom;

  if (_isSameValue) {
    segmentRect = Rect.fromPoints(Offset(x1, y1), Offset(x2, y2));
  }

  if (series.showIndicationForSameValues && high == low) {
    centerY = (high + low) / 2;
    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, y));
      points.add(Offset(x + 2, y));
      points.add(Offset(x, y));
    } else {
      points.add(Offset(x, y - 2));
      points.add(Offset(x, y));
      points.add(Offset(x, y + 2));
      points.add(Offset(x, y));
    }
  } else {
    points.add(Offset(transformX(centerX, high), transformY(centerX, high)));
    points.add(Offset(transformX(centerX, top), transformY(centerX, top)));

    points.add(Offset(transformX(centerX, low), transformY(centerX, low)));
    points.add(
        Offset(transformX(centerX, bottom), transformY(centerX, bottom)));
  }

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