widgetmarkergooglemap(
    initialcameraposition: shibuya,
    maptype: maptype.normal,
    widgetmarkers: [
      widgetmarker(
        position: cafeposition,
        markerid: 'cafe',
        widget: container(
          color: colors.brown,
          padding: const edgeinsets.all(2),
          child: const icon(
            icons.coffee,
            color: colors.white,
            size: 64,
          ),
        ),
      ),
      widgetmarker(
        position: clothesshopposition,
        markerid: 'clothes',
        widget: container(
          color: colors.green,
          padding: const edgeinsets.all(4),
          child: const text(
            'shop',
            style: textstyle(
              color: colors.white,
              fontweight: fontweight.bold,
              fontsize: 32,
            ),
          ),
        ),
      ),
      widgetmarker(
        position: hamburgershopposition,
        markerid: 'hamburger',
        widget: container(
          color: colors.red,
          padding: const edgeinsets.all(2),
          child: const icon(
            icons.fastfood,
            color: colors.yellow,
            size: 64,
          ),
        ),
      ),
    ],
  ),

class widgetmarker {
  widgetmarker({
    required this.position,
    required this.markerid,
    required this.widget,
    this.ontap,
  }) : assert(markerid.isnotempty);

  final latlng position;

  /// keep this unique, otherwise it will not appear.
  final string markerid;

  /// gestures of widget is disabled.
  /// use this callback instead.
  final voidcallback? ontap;

  final widget widget;
}