Function pathTweenPoints

chapter18/docs/d3-graphviz.js:385–407

(node, d1, precision, precisionIsRelative)

    };
  }
  function pathTweenPoints(node, d1, precision, precisionIsRelative) {
    var path0 = node;
    var path1 = path0.cloneNode();
    var n0 = path0.getTotalLength();
    var n1 = (path1.setAttribute("d", d1), path1).getTotalLength();

    // Uniform sampling of distance based on specified precision.
    var distances = [0];
    var i = 0;
    var dt = precisionIsRelative ? precision : precision / Math.max(n0, n1);
    while ((i += dt) < 1) {
      distances.push(i);
    }
    distances.push(1);

    // Compute point-interpolators at each distance.
    var points = distances.map(function (t) {
      var p0 = path0.getPointAtLength(t * n0);
      var p1 = path1.getPointAtLength(t * n1);
      return [[p0.x, p0.y], [p1.x, p1.y]];
    });
    return points;
  }

  function data () {
    return this._data || null;