How to make bubble markers to be automatically scale according to zoom ratio when user performing zoom action for Bubble chart?
Right now, bubble chart doesn't support automatic scaling according to the zoom ratio.
You can always implement your own logic to modify the scale, though. See the "BubbleSmallSize", "BubbleLargeSize", and "BubbleWeightScale" properties of the BubbleSeries.
You can listen for the WindowRectChanged event to know when the zoom level has changed. And the width and height of the window rect indicate what percentage of the entire chart you can see. Note that the zoom does not automatically preserve the aspect ratio of the visible space, so if you scale the bubble sizes differently in x and y they may start to look elliptical. You can enforce a square aspect ratio for the chart by setting the IsSquare property on the chart, however.
-Graham