Buffering a click in screen space

MBambino_ATS

I have a Map Tool that listens for a click on the map to then search for shapes (mainly lines and points). I already have the settings enabled to use the visual shape to increase the click area, but is it possible to extend that even further? I know that you can use a circle to increase the search area, but that makes zoomed-in clicks much wider than zoomed out clicks. Is there a way to scale the circle to the screen size, so for example, I would search and extra 4 pixels in all directions?

MBambino_ATS

protected override async Task<bool> OnSketchCompleteAsync(Geometry geometry) {
    return await QueuedTask.Run<bool>(async () => {
        // geometry is a point
        var clickedPnt = geometry as MapPoint;
        if (clickedPnt == null)
            return false;

        float tolerance = 4.0f; // Buffer size

        // Take the screen-space point and buffer it by the tolerance
        var topLeft = new Coordinate2D(clickedPnt.X - tolerance, clickedPnt.Y + tolerance);
        var bottomRight = new Coordinate2D(clickedPnt.X + tolerance, clickedPnt.Y - tolerance);

        Geometry envelopeGeometry = EnvelopeBuilderEx.CreateEnvelope(topLeft, bottomRight);
        if (envelopeGeometry == null)
            return false;

        var result = ActiveMapView.GetFeatures(envelopeGeometry);

        foreach (var kvp in result.ToDictionary()){
            // Do Stuff
        }

        return true; // Return T/F based on the above loop
    });
}

Thanks for pointing me to that!
I found a mistake in that example, though. The envelope created is never used, and if it were used, it wouldn't find the correct target due to a differing spatial reference id.
Here is the correct code: