Instead of plotting the whole data and clipping the unnecessary parts, you could keep a global array of all values that you just slice each time you need to update the graph. Then you can more easily recompute your x axis & values. Downside is you cannot easily have a transition.
So, you would have two variables:
var globalOffset = 0; var panOffset = 0;
globalOffset would be updated each time you populate new values and
panOffset each time you pan.
Then you just slice your data before plotting:
var offset = Math.max(0, globalOffset + panOffset); var graphData = globalData.slice(offset, offset + 100);
See fiddle for complete solution.
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