The Boundary
link tool renders a rectangular border to show the bounding box of the link. It accepts one additional argument, which can be passed as an object to the link tool constructor:
padding | number | This option determines whether the boundary area should be visually inflated and if so, by how much. Default is 10 . |
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Example:
var boundaryTool = new joint.linkTools.Boundary({
focusOpacity: 0.5,
padding: 20
});