add formula to setZoomLevel doc
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@ -831,7 +831,8 @@ Sends a request to get current zoom factor, the `callback` will be called with
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Changes the zoom level to the specified level. The original size is 0 and each
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increment above or below represents zooming 20% larger or smaller to default
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limits of 300% and 50% of original size, respectively.
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limits of 300% and 50% of original size, respectively. The formula for this is
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`scale := 1.2 ^ level`.
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#### `contents.getZoomLevel(callback)`
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