Hi Mark,
Thanks for using Syncfusion Products,
#1) when I pinch zoom the chart, the zoom factors I get reported to me in the event handlers don't appear to bear any relation to the zoom factor on the chart - which remains fixed at 0.5. should be fixed when we zoom,
We don't have ZoomFactor property in SfChart class. This property is present in an axis instance. When you zoomin/zoomout, you will get correct zoom factor value in CurrentZoomFactor property in the event arguments. While zooming, value of the ZoomFactor property on axis remains 0.5 and we confirm it is a bug.
#2)Is this how it is supposed to work? I couldn't find any meaningful documentation on the zoom factors reported
Currently, we are working on UG documentation and we will publish it as soon as possible.
#3) What I'm trying to do is cancel zooming when it reaches a specified threshold in each direction but allow it to return in the opposite direction. I can do this by setting
ZoomStart event will be fired only once when you are about to zoom. ZoomDelta event will be fired continuously while zooming. We suggest you to cancel ZoomDelta event when it reached certain threshold as we demonstrated in the sample.
Sample :
http://www.syncfusion.com/downloads/support/forum/118985/ChartSample-821216568.zip Please let us know if you require further assistance, we are happy to assist you.
Thanks,
Yuvaraj P