show method

void show(dynamic x, double y, [ String coordinateUnit = 'point' ])

Displays the trackball at the specified x and y-positions.

*x and y - x & y pixels/values at which the trackball needs to be shown.

coordinateUnit - specify the type of x and y values given.

pixel or point for logical pixel and chart data point respectively.

Defaults to point.

Implementation

void show(dynamic x, double y, [String coordinateUnit = 'point']) {
  assert(x != null);
  assert(!y.isNaN);
  if (coordinateUnit == 'point') {
    final RenderBehaviorArea? parent = parentBox as RenderBehaviorArea?;
    if (parent != null) {
      _position = rawValueToPixelPoint(
          x, y, parent.xAxis, parent.yAxis, parent.isTransposed);
    }
  } else if (coordinateUnit == 'pixel') {
    _position = Offset(x, y);
  }
  if (builder == null) {
    _generateAllPoints(position!);
    (parentBox as RenderBehaviorArea?)?.invalidate();
  } else {
    final RenderBehaviorArea? parent = parentBox as RenderBehaviorArea?;
    if (parent == null) {
      return;
    }
    if (_position == null) {
      return;
    }
    _generateAllPoints(_position!);
    List<CartesianChartPoint> points = <CartesianChartPoint>[];
    List<int> currentPointIndices = <int>[];
    List<int> visibleSeriesIndices = <int>[];
    List<dynamic> visibleSeriesList = <dynamic>[];
    TrackballGroupingModeInfo groupingModeInfo;

    for (int index = 0; index < chartPointInfo.length; index++) {
      final CartesianChartPoint dataPoint =
          chartPointInfo[index].chartDataPoint!;
      if (tooltipDisplayMode == TrackballDisplayMode.groupAllPoints) {
        points.add(dataPoint);
        currentPointIndices.add(chartPointInfo[index].dataPointIndex!);
        visibleSeriesIndices.add(chartPointInfo[index].seriesIndex);
        visibleSeriesList.add(chartPointInfo[index].series!);
      }
    }
    groupingModeInfo = TrackballGroupingModeInfo(
        points, currentPointIndices, visibleSeriesIndices, visibleSeriesList);
    final List<TrackballDetails> details = <TrackballDetails>[];
    for (int i = 0; i < chartPointInfo.length; i++) {
      if (tooltipDisplayMode == TrackballDisplayMode.groupAllPoints) {
        details
            .add(TrackballDetails(null, null, null, null, groupingModeInfo));
        break;
      } else {
        details.add(TrackballDetails(
          chartPointInfo[i].chartDataPoint,
          chartPointInfo[i].series!,
          chartPointInfo[i].dataPointIndex,
          chartPointInfo[i].seriesIndex,
        ));
      }
    }
    parent.trackballBuilder!(details);
    points = <CartesianChartPoint>[];
    currentPointIndices = <int>[];
    visibleSeriesIndices = <int>[];
    visibleSeriesList = <CartesianSeries>[];
  }
}