UnderlayCallbackFunc typedef
UnderlayCallbackFunc =
void Function(dynamic context, DygraphArea area, Dygraph dygraph, Dygraph dygraphDeprecated)
Implementation
typedef UnderlayCallbackFunc = void Function(
// the canvas drawing context on which to draw
dynamic context,
// an object with {x,y,w,h} properties describing the drawing area
DygraphArea area,
// the reference graph
Dygraph dygraph,
// the reference graph (passed again for bc; see https://github.com/danvk/dygraphs/blob/da2a028fc41e5573868358b3d9eda9826211d217/src/dygraph.js#L2327)
Dygraph dygraphDeprecated,
);