Segements + Anchors

by Roman Bruckner

HTML

<html>
<head>
    <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/jointjs/3.4.4/joint.css" />
</head>
<body>
      <!-- content -->
      <div id="paper"></div>

      <!-- dependencies -->
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.4.0/backbone.js"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jointjs/3.4.4/joint.js"></script>
    
    </body>
</html>

JavaScript

var graph = new joint.dia.Graph();
var paper = new joint.dia.Paper({
    el: document.getElementById('paper'),
    width: 800,
    height: 600,
    model: graph,
    interactive: { linkMove: false },
    defaultConnectionPoint: {
        name: 'boundary',
        args: {
            extrapolate: true,
            sticky: true
        }
    },
    background: {
        color: '#F5FAFA'
    }
});

const r1 = new joint.shapes.standard.Rectangle();
r1.resize(100, 100).position(100,100);

const r2 = new joint.shapes.standard.Rectangle();
r2.resize(100, 100).position(500,100);

const link = new joint.shapes.standard.Link({
    vertices: [{ x: 150, y: 300 }, { x: 550, y: 300 }]
});
link.source(r1);
link.target(r2);

graph.addCells([r1, r2, link]);

link.findView(paper).addTools(new joint.dia.ToolsView({
    tools: [
        new joint.linkTools.Vertices(),
        new joint.linkTools.Segments({
            anchor: getAnchor
        })
    ]
}));

function getAnchor(coords, view, magnet) {
    // take advantage of an existing logic inside of the
    // pin relative connection strategy
    var end = joint.connectionStrategies.pinAbsolute.call(
        this.paper,
        {},
        view,
        magnet,
        coords,
        this.model
    );
    return end.anchor;
}