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I created a fictional map and visualized it with d3. Now I would like to show a scale/rule so that the user can see which distance (kilometers,meters) he is currently using.

I was thinking about creating lines in QGIS (with which I created the map) and than setting the distance in km/m as attributes. After that using these information for the scale on the website.

Is that a good way or is there any easier and better way to do this.

The scale should also change the values when zooming for sure. So a picture is no solution.

Found this here: which is generating distances. But I'm not sure that a can adapt this for me: http://bl.ocks.org/mpmckenna8/def3735b8e1eef5128a7

This one is nearly what I'm looking for: http://www.qgistutorials.com/en/docs/making_a_map.html But I want to create that scalebar on my site and not just as an image. So how to transfer that information?

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