I've added a point on map like this but it is static in size.
How to resize that point on zooming?
Map on zoom out
Answer
The Resize, as @Mapperz mentioned is probably the way to go.
Alternatively, If you have lots of points, rather than looping through all the points resizing them, you could change the layer's pointRadius style on map zoom so the change happens to all features in one call. I can't say for sure what is better performance, but I would imagine changing the style would if there are many points.
The styling method has drawbacks such as does not have as many options as the Resize does (scale,origin,ratio), it's only a radius.
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