onPaint method

@override void onPaint(PaintingContext context, Offset offset, SfChartThemeData chartThemeData, ThemeData themeData,)

Called to customize each behaviors with given context at the given offset.

Implementation

@override
void onPaint(
  PaintingContext context,
  Offset offset,
  SfChartThemeData chartThemeData,
  ThemeData themeData,
) {
  final RenderBehaviorArea? parent = parentBox as RenderBehaviorArea?;
  if (parent == null) {
    return;
  }
  final RenderCartesianAxes? cartesianAxes = parent.cartesianAxes;
  if (cartesianAxes == null) {
    return;
  }
  if (_zoomingRect != Rect.zero && _rectPath != null) {
    Color? fillColor = selectionRectColor;
    if (fillColor != null &&
        fillColor != Colors.transparent &&
        fillColor.a == 1) {
      fillColor = fillColor.withValues(alpha: 0.3);
    }
    final Paint fillPaint =
        Paint()
          ..color =
              (fillColor ?? cartesianAxes.chartThemeData.selectionRectColor)!
          ..style = PaintingStyle.fill;
    context.canvas.drawRect(_zoomingRect, fillPaint);
    final Paint strokePaint =
        Paint()
          ..isAntiAlias = true
          ..color =
              (selectionRectBorderColor ??
                  cartesianAxes.chartThemeData.selectionRectBorderColor)!
          ..strokeWidth = selectionRectBorderWidth
          ..style = PaintingStyle.stroke;

    if (strokePaint.color != Colors.transparent &&
        strokePaint.strokeWidth > 0) {
      final List<double> dashArray = <double>[5, 5];
      drawDashes(context.canvas, dashArray, strokePaint, path: _rectPath);
    }

    final Offset plotAreaOffset =
        (parent.parentData! as BoxParentData).offset;
    // Selection zooming tooltip rendering
    _drawTooltipConnector(
      cartesianAxes,
      parent,
      _zoomingRect.topLeft,
      _zoomingRect.bottomRight,
      context.canvas,
      parent.paintBounds,
      plotAreaOffset,
    );
  }
}