Constrain the rectangle shape

[andrey_dung]

I’m making an annotation tool for time series data. When a user click on the plot, a rectangular shape will be created.

How could the rectangle shapes be constrained that y0=0 and y1=1? And also, what would be the best way to add text at the middle of the rectangle?

[etienne]

@andrey_dung

How could the rectangle shapes be constrained that y0=0 and y1=1?

You can try listening to relayout as in https://codepen.io/etpinard/pen/rwQmWe?editors=0011

@andrey_dung

And also, what would be the best way to add text at the middle of the rectangle?

add an arrow-less (showarrow: false) annotation.