Sigi,
Datapoints will be plotted at it’s corresponding x and y values. When you increase the width / height of the chart, the corresponding x & y pixel-coordinates of a datapoint gets updated as per the latest size of the chart, but the value of that particular datapoint remains same.
If you are referring to some other issue, kindly brief us more about the same along with an example so that we can understand it better and help you out.
—
Vishwas R
Team CanvasJS
