canvas overlay in openlayers 3

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Recently, I'm trying to overlay an isoline layer on top of the map in openlayers 3. The isoline is drawn as bezier curve, which means it can't be taken as geometry, or added to ol.source.ImageCanvas. I have seen some kind of dynamic canvas overlay(https://msdn.microsoft.com/en-us/library/mt762878.aspx) in Bing Maps. I'm wondering if there is any possibility to realize a similar one in openlayers 3. I have tried to extend ol.layer or ol.overlay for this. Both ended up in failure. Can anyone provide some tips?

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