Overlays and ROIs

The Vue widget accepts two independent annotation types.

XY overlays

An XyOverlay is a named polyline with equal-length X and Y arrays and an optional CSS color. Supply initial overlays in the atomic source call or update them later:

await viewer.setSource(source, { xyOverlays })
viewer.setXyOverlays(nextOverlays)

The Options menu's XY Plot item is disabled when no overlays exist and toggles their visibility when they do.

ROIs

Roi is a rectangle or line in image coordinates. IDs must be stable within the supplied collection.

viewer.setRois([
  { id: 'region-1', kind: 'rect', x0: 10, y0: 20, x1: 40, y1: 60 },
])

Set the roiToolsEnabled prop to false when the host does not want the viewer to expose ROI controls. ROIs and XY overlays are currently Vue-widget APIs; the Custom Element forwards neither setter.