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;
  final double centerY = (low + high) / 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) {
    points.add(Offset(x1, y1));
    points.add(Offset(x2, y2));

    if (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));
      }
    }
    segmentRect = Rect.fromPoints(points[0], points[1]);
  } 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);
    }
  }
}