Volker Voß,
The behavior is designed such that zooming is limited upto a certain region so that the user doesn’t end up zooming into a blank region (region with no dataPoints). To zoom into a certain region, there should be a minimum of 3-4 dataPoints over the axis.
In your case, the zoom doesn’t work as there are less than 3-4 dataPoints with different values over the axisY in the signalPick dataSeries. We suggest you set the zoomType to x in such scenarios.
If the solution suggested doesn’t fulfill your requirement, kindly brief us further about your use case so that we can understand your scenario better and help you out with an appropriate solution.
—
Thangaraj Raman
Team CanvasJS
