ArtArchive/Class5/marc_network/public/sigma/examples/custom-edge-renderer.html

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<div id="container">
  <style>
    #graph-container {
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
      position: absolute;
    }
  </style>
  <div id="graph-container"></div>
</div>
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<script>
/**
 * This is a basic example on how to develop a custom edge renderer. In
 * this example, the renderer will display the edge as a path made of two
 * segments, an horizontal one and a vertical one. To make it just a bit
 * "more readable", I also used the FA2 plugin (but it is actually  still
 * not readable).
 *
 * IMPORTANT: This edge renderer just works with the canvas renderer. If
 * you do want to display images with the WebGL renderer, you will have
 * to develop a specific WebGL edge renderer.
 */
sigma.utils.pkg('sigma.canvas.edges');
sigma.canvas.edges.t = function(edge, source, target, context, settings) {
  var color = edge.color,
      prefix = settings('prefix') || '',
      edgeColor = settings('edgeColor'),
      defaultNodeColor = settings('defaultNodeColor'),
      defaultEdgeColor = settings('defaultEdgeColor');

  if (!color)
    switch (edgeColor) {
      case 'source':
        color = source.color || defaultNodeColor;
        break;
      case 'target':
        color = target.color || defaultNodeColor;
        break;
      default:
        color = defaultEdgeColor;
        break;
    }

  context.strokeStyle = color;
  context.lineWidth = edge[prefix + 'size'] || 1;
  context.beginPath();
  context.moveTo(
    source[prefix + 'x'],
    source[prefix + 'y']
  );
  context.lineTo(
    source[prefix + 'x'],
    target[prefix + 'y']
  );
  context.lineTo(
    target[prefix + 'x'],
    target[prefix + 'y']
  );
  context.stroke();
};

// Now, let's use the renderer
var i,
    s,
    N = 50,
    E = 150,
    g = {
      nodes: [],
      edges: []
    },
    colors = [
      '#617db4',
      '#668f3c',
      '#c6583e',
      '#b956af'
    ];

// Generate a random graph:
for (i = 0; i < N; i++)
  g.nodes.push({
    id: 'n' + i,
    label: 'Node ' + i,
    x: Math.random(),
    y: Math.random(),
    size: Math.random(),
    color: colors[Math.floor(Math.random() * colors.length)]
  });

for (i = 0; i < E; i++)
  g.edges.push({
    id: 'e' + i,
    source: 'n' + (Math.random() * N | 0),
    target: 'n' + (Math.random() * N | 0),
    size: Math.random(),
    type: 't'
  });

// Instantiate sigma:
s = new sigma({
  graph: g,
  renderer: {
    // IMPORTANT:
    // This works only with the canvas renderer, so the
    // renderer type set as "canvas" is necessary here.
    container: 'graph-container',
    type: 'canvas'
  }
});

// Start the ForceAtlas2 algorithm:
s.startForceAtlas2();
</script>