centerContentBounds property

Rectangle<int> get centerContentBounds

Gets a bounding box for the largest center content card that can fit inside the hole of the chart.

If the inner radius of the arcs is smaller than ArcRendererConfig.minHoleWidthForCenterContent, this will return a rectangle of 0 width and height to indicate that no card can fit inside the chart.

Implementation

Rectangle<int> get centerContentBounds {
  // Grab the first arcList from the animated set.
  final arcLists = getArcLists();
  final arcList = arcLists.isNotEmpty ? arcLists.first : null;

  // No card should be visible if the hole in the chart is too small.
  if (arcList == null ||
      arcList.innerRadius! < config.minHoleWidthForCenterContent) {
    // Return default bounds of 0 size.
    final bounds = chart!.drawAreaBounds;
    return Rectangle<int>(
      (bounds.left + bounds.width / 2).round(),
      (bounds.top + bounds.height / 2).round(),
      0,
      0,
    );
  }

  // Fix the height and width of the center content div to the maximum box
  // size that will fit within the pie's inner radius.
  final width = (_cosPIOver4 * arcList.innerRadius!).floor();

  return Rectangle<int>(
    (arcList.center!.x - width).round(),
    (arcList.center!.y - width).round(),
    width * 2,
    width * 2,
  );
}