draw_tableau_polygons_on_background_image now shows guide lines

The draw_tableau_polygons_on_background_image.html tool has been updated so show a guide line after you’ve clicked the first point of each polygon, so it now works like the Google map polygon drawing tool. It still only records points when you click, and you should finish the polygon with a right-click rather than drawing the last side.

Download the new code here:

https://github.com/bryantbhowell/tableau-map-pack/blob/master/draw_tableau_polygons_on_background_image.html

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