CODEWITHSUNDEEP
openlayers-3
averas
averas

Reputation: 545

Get exact resolution during zooming in postrender hook in Openlayers 3

I have some custom svg layers rendered "on top" of openlayers 3 using d3.js, which works fine. During the postrender-event I translate and update coordinates of my layers which, again, work fine.

For some layers I do, however, want to scale the visual objects based on zoom levels. I have a working solution based on map.getView().getResolution() but it's not perfectly smooth as, during zooming, getResolution() returns the same resolution until the transition is done.

Is there any way to get an update on the exact resolution during the zooming?

Upvotes: 2

Views: 1271

Answers (1)

Alvin Lindstam
Alvin Lindstam

Reputation: 3142

map.on('postrender', function(event){
    console.log(event.frameState.viewState.resolution);
});

The viewState object contains the current resolution, center, rotation and projection of the View.

Relevant docs: http://openlayers.org/en/v3.8.2/apidoc/ol.MapEvent.html, http://openlayers.org/en/v3.8.2/apidoc/olx.html#FrameState, http://openlayers.org/en/v3.8.2/apidoc/olx.html#ViewState

Upvotes: 3

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