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Hi,
For storing dataPoints after shift+click you can use click event along with window.event.shiftKey. Here is an example with zoom-Pan.
And for reading data from a file you can refer following threads and this JSFiddle. https://canvasjs.com/forums/topic/how-can-i-plot-values-from-txt-file/ https://canvasjs.com/forums/topic/graph-a-csv-file/#post-6371