showByIndex method

void showByIndex(int pointIndex)

Displays the crosshair at the specified point index.

pointIndex - index of point at which the crosshair needs to be shown.

Implementation

void showByIndex(int pointIndex) {
  // ignore: unnecessary_null_comparison
  if (_stateProperties != null) {
    final CrosshairBehaviorRenderer crosshairBehaviorRenderer =
        _stateProperties.crosshairBehaviorRenderer;
    final CrosshairRenderingDetails renderingDetails =
        CrosshairHelper.getRenderingDetails(crosshairBehaviorRenderer);
    if (validIndex(pointIndex, 0, renderingDetails.crosshairPainter!.chart)) {
      if (renderingDetails.crosshairPainter != null) {
        final List<CartesianSeriesRenderer> visibleSeriesRenderer =
            renderingDetails.crosshairPainter!.stateProperties.chartSeries
                .visibleSeriesRenderers;
        final SeriesRendererDetails seriesRendererDetails =
            SeriesHelper.getSeriesRendererDetails(visibleSeriesRenderer[0]);
        final List<CartesianChartPoint<dynamic>> dataPoints =
            getSampledData(seriesRendererDetails);
        // ignore: unnecessary_null_comparison
        if (pointIndex != null &&
            pointIndex.abs() < seriesRendererDetails.dataPoints.length) {
          renderingDetails.crosshairPainter!.generateAllPoints(Offset(
              dataPoints[pointIndex].markerPoint!.x,
              dataPoints[pointIndex].markerPoint!.y));
        }
        renderingDetails.crosshairPainter!.canResetPath = false;
        renderingDetails.crosshairPainter!.stateProperties
            .repaintNotifiers['crosshair']!.value++;
      }
    }
  }
}