Shared y-axis for overlaid tracks (e.g. for BigWig files)

[mwittep]

Hi!

I have been using Gosling for creating an overlaid visualization of two BigWig files (two conditions) for one organism. The tracks look a little bit like this:

Track Code

{ "data": {
                "url": `/api/provideBigWig/${filePath}/${genome}/${strand}/${type}`,
                "type": "bigwig",
                "binSize": 1,
                "aggregation": "mean"
            },
            "mark": "bar",
            "x": { "field": "start", "type": "genomic", },
            "xe": { "field": "end", "type": "genomic", },
            "style": { "align": strand === "+" ? "left" : "right", backgroundOpacity: 0 },
            "y": { "field": "value", "type": "quantitative", "range": [0, 90], flip: strand === "-" },
            "color": { "value": type === "Normal" ? "gray" : "orange" },
            "stroke": { "value": "gray" },
            "opacity": { "value": 0.25 },
            "visibility": [
                {
                    "operation": "LT",
                    "measure": "zoomLevel",
                    "threshold": 5000,
                    "transitionPadding": 100,
                    "target": "track"
                }
            ],
            "tooltip": [
                { "field": "start", "alt": "start" },
                { "field": "end", "alt": "Bin end" },
                { "field": "position", "alt": "pos" },
                {
                    "field": "value",
                    "alt": "val",
                },
            ],
        }

Track Visualized

Result of Code is marked in RED and mouse pointer is represented by the black arrow.

I am able to visualize the data (see image, red part). However, the tracks are overlaid and do not share the same axis (see tooltip values). While the value for the gray bar is around 0.9, the value of the orange bar is around 9. Nevertheless, they look the same.

I have tried to define the min and max domain for the whole track, but the problem then is that that domain is quite big (as it is common in a BigWig file), hence I lose the detail for low-expressed regions.

Is there any way of creating a "shared axis"? I.e. tell Gosling to use the maximal domain value in the current genomic window for both BigWig tracks?