Link Selection

by Roman Bruckner

HTML

<html>
<head>
    <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/jointjs/3.5.4/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/3.5.4/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
});

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: { id: el3.id },
  connector: { name: 'smooth' },
  vertices: [{ x: 300, y: 300 }]
});


graph.addCells([el1, el2, el3, l1, l2]);

paper.on('blank:pointerdown', function(evt, x, y) {
  const bbox = new g.Rect(x, y, 1, 1);
  const rect = V('rect', {
    'stroke': 'blue',
    'fill': 'blue',
    'fill-opacity': 0.1,
  });
  rect.attr(bbox.toJSON());
  rect.appendTo(this.svg);
  evt.data = {
    rect,
    ox: x,
    oy: y,
    bbox
  };
});


paper.on('blank:pointermove', function(evt, x, y) {
  const {
    ox,
    oy,
    rect
  } = evt.data;
  const bbox = new g.Rect(ox, oy, x - ox, y - oy);
  if (bbox.width === 0) bbox.width = 1;
  if (bbox.height === 0) bbox.height = 1;
  bbox.normalize();
  rect.attr(bbox.toJSON());
  evt.data.bbox = bbox;
});


var frames = [];

paper.on('blank:pointerup', function(evt) {
  const {
    rect,
    bbox
  } = evt.data;
  rect.remove();
  const...