Rectangle selection

Press "ctrl" and drag the mouse to enable the rectangle select. If no node is inside the rectangle, edges will be selected instead.

          <!DOCTYPE html>
<html>
<head>
  <title>Rectangle select</title>
  <meta charset="utf-8">
  <script src="../build/ogma.min.js"></script>
  <style>
    #graph-container { top: 0; bottom: 0; left: 0; right: 0; position: absolute; margin: 0; overflow: hidden; }
  </style>
</head>
<body>
<div id="graph-container"></div>

<script>
  'use strict';

  var ogma = new Ogma({
    container: 'graph-container',
    graph: {
      nodes: [
        {id: 0, attributes: {x: 0, y: 0}},
        {id: 1, attributes: {x: 100, y: 0}},
        {id: 2, attributes: {x: 50, y: 50}},
        {id: 3, attributes: {x: 50, y: -50}}
      ],
      edges: [
        {id: 0, source: 0, target: 1},
        {id: 1, source: 0, target: 1},
        {id: 2, source: 0, target: 1},
        {id: 3, source: 3, target: 3}
      ]
    }
  });

  ogma.events.onDragStart(function () {
    if (ogma.keyboard.isKeyPressed('ctrl')) {
      ogma.getSelectedNodes().setSelected(false);
      ogma.getSelectedEdges().setSelected(false);
      ogma.tools.rectangleSelect.enable({
        bothExtremities: true, // only if both endpoints are inside the rectangle
        callback({ nodes, edges }) {
          nodes.setSelected(true);
          edges.setSelected(true);
        }
      });
    }
  });

</script>
</body>
</html>