Custom Selection RestricTranslation

by Roman Bruckner

HTML

<html>
<head>
    <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/jointjs/3.7.7/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/3.7.7/joint.js"></script>
    
    </body>
</html>

JavaScript

var graph = new joint.dia.Graph({}, {
    cellNamespace: joint.shapes
});

const paper = new joint.dia.Paper({
    el: document.getElementById('paper'),
    width: 800,
    height: 900,
    model: graph,
    defaultConnectionPoint: {
        name: 'boundary'
    },
    cellViewNamespace: joint.shapes,

    restrictTranslate: function(elementView, x0, y0) {
    // x0 and y0 are pointer coordinates at the start of the translation
    const path = new g.Path('M 20 20 L 200 200 L 380 20');
    const { x: x1, y: y1, width, height } = elementView.model.getBBox();
    // The initial difference between the pointer coordinates and the element position
    const dx = x1 - x0;
    const dy = y1 - y0;
    return function(x, y) {
        // Find the point on the path.
        const point = path.closestPoint({ x: x - dx, y: y - dy });
        // Put the center of the element on this point
        point.offset(-width / 2, -height / 2);
        return point;
    };
    }
});

var el1 = new joint.shapes.standard.Circle({
    position: {
        x: 10,
        y: 10
    },
    size: {
        width: 50,
        height: 50
    },
    attrs: {
        label: {
            text: 'A'
        }
    }
});
var el2 = new joint.shapes.standard.Rectangle({
    position: {
        x: 100,
        y: 200
    },
    size: {
        width: 50,
        height: 50
    },
    attrs: {
        label: {
            text: 'B'
        }
    }
});
var el3 = new joint.shapes.standard.Path({
    position: {
        x: 300,
        y: 100
    },
    size: {
        width: 50,
        height: 50
    },
    attrs: {
        body: {
            refD: 'M 1 0 2 1 1 2 0 1 z'
        },
        label: {
            text: 'C'
        }
    }
});

var l1 = new joint.shapes.standard.Link({
    source: {
        id: el1.id
    },
    target: {
        id: el2.id
    },
    router: {
        name: 'orthogonal'
    }
});

var l2 = new joint.shapes.standard.Link({
    source: {
        id: el2.id
    },
    target: {
 ...