JointJS: Connection Strategy

From the source center to a specific point on the target

by Roman Bruckner

HTML

<html>

  <head>
    <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.2/css/all.min.css" />
  </head>

  <body>
    <!-- content -->
    <div id="paper" style="margin: 20px;"></div>

    <!-- dependencies -->
    <script src="https://cdn.jsdelivr.net/npm/@joint/[email protected]/dist/joint.min.js"></script>
  </body>

</html>

JavaScript

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

const paper = new joint.dia.Paper({
    el: document.getElementById('paper'),
    width: 800,
    height: 900,
    model: graph,
    cellViewNamespace: joint.shapes,
    gridSize: 10,
    async: true,
    sorting: joint.dia.Paper.sorting.APPROX,
    defaultConnectionPoint: {
        name: 'boundary',
    },
    connectionStrategy: function(end, elementView, magnet, coords, link, endType, paper) {
        if (endType === 'source') return end;
        return joint.connectionStrategies.pinAbsolute(end, elementView, magnet, coords, link, endType, paper);
    }
});

// Example

const el1 = new joint.shapes.standard.Rectangle({
    position: {
        x: 10,
        y: 270
    },
    size: {
        width: 100,
        height: 90
    },
    attrs: {
        label: {
            text: 'A'
        }
    }
});
const el2 = new joint.shapes.standard.Rectangle({
    position: {
        x: 400,
        y: 170
    },
    size: {
        width: 100,
        height: 90
    },
    attrs: {
        label: {
            text: 'B'
        }
    }
});


graph.addCells([el1, el2]);

const toolsView = new joint.dia.ToolsView({
    tools: [
        new joint.elementTools.Connect({
            x: 'calc(w+10)',
            y: 'calc(h / 2)'
        })
    ]
});
el1.findView(paper).addTools(toolsView);