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drag & drop

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I'm trying to add functionality to my 2D scrollable line chart to allow

users to drag a vertical stripe horizonally along the x-axis. I need to

derive the position of this stripe after moving. Any ideas?

(I thought about adding an annotation object but I don't think it is

possible to get it's position in relation to the axes. I thought about using

a vertical stripe with 2 HTML buttons which could redraw chart...but it

could get a bit hairy given chart is scrollable.)

Any help would be appreciated.


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