BravenChartController class

Programmatic control over series, point linking, and Y-axis slot state.

Attach to BravenChartPlus.controller to drive series selection and axis swaps from outside the chart widget.

The controller is optional — charts without one still respond to legend taps and data-point taps internally. Add a controller when you need to read slot state, link another surface by ChartPointRef, capture an effective document, or trigger selection externally.

Example:

final _controller = BravenChartController();

@override
void dispose() {
  _controller.dispose();
  super.dispose();
}

// Somewhere outside the chart:
_controller.selectSeries('heat_strain');
print(_controller.visibleAxisIds);