Remove unnecessary chart updates on drags #913
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Changes a few
chart.update()calls in the zoom drag handler (i.e. mouse down, mouse move, mouse up) to just usechart.draw()instead. The chart update was unnecessary since none of the chart elements had updated. It is also much more expensive to update the chart (incurring costs of things like recomputing the ticks, recomputing any datapoint styling using chart context, etc.) than just to redraw the chart. In some cases with lots of datapoints, this speeds up the function from 100ms -> 1ms. As far as I can tell, the only purpose of thechart.update()call was to repaint the shaded area being zoomed, butchart.draw()achieves the same purpose.