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']) {
  final CartesianStateProperties stateProperties = _stateProperties;
  final TrackballRenderingDetails trackballRenderingDetails =
      TrackballHelper.getRenderingDetails(
          _stateProperties.trackballBehaviorRenderer);
  final List<CartesianSeriesRenderer> visibleSeriesRenderer =
      stateProperties.chartSeries.visibleSeriesRenderers;
  if (visibleSeriesRenderer.isEmpty) {
    return;
  }
  final SeriesRendererDetails seriesRendererDetails =
      SeriesHelper.getSeriesRendererDetails(visibleSeriesRenderer.firstWhere(
          (CartesianSeriesRenderer element) =>
              SeriesHelper.getSeriesRendererDetails(element)
                  .visibleDataPoints !=
              null));
  if (trackballRenderingDetails.trackballPainter != null || builder != null) {
    final ChartAxisRendererDetails xAxisDetails =
        seriesRendererDetails.xAxisDetails!;
    if (coordinateUnit != 'pixel') {
      final ChartLocation location = calculatePoint(
          (x is DateTime && (xAxisDetails is! DateTimeCategoryAxisDetails))
              ? x.millisecondsSinceEpoch
              : ((x is DateTime &&
                      xAxisDetails is DateTimeCategoryAxisDetails)
                  ? xAxisDetails.labels
                      .indexOf(xAxisDetails.dateFormat.format(x))
                  : ((x is String && xAxisDetails is CategoryAxisDetails)
                      ? xAxisDetails.labels.indexOf(x)
                      : x)),
          y,
          xAxisDetails,
          seriesRendererDetails.yAxisDetails!,
          seriesRendererDetails.stateProperties.requireInvertedAxis,
          seriesRendererDetails.series,
          seriesRendererDetails.stateProperties.chartAxis.axisClipRect);
      x = location.x;
      y = location.y;
    }
    if (seriesRendererDetails.visibleDataPoints!.isNotEmpty == true) {
      if (trackballRenderingDetails.trackballPainter != null) {
        trackballRenderingDetails.isTrackballTemplate = false;
        trackballRenderingDetails.generateAllPoints(Offset(x.toDouble(), y));
      } else if (builder != null && (!trackballRenderingDetails.isMoving)) {
        trackballRenderingDetails
            .showTemplateTrackball(Offset(x.toDouble(), y));
      }
    }
  }

  if (trackballRenderingDetails.trackballPainter != null) {
    trackballRenderingDetails.trackballPainter!.canResetPath = false;
    stateProperties.repaintNotifiers['trackball']!.value++;
  }
}