Function d3_interpolateTransform

explainshell/web/static/js/d3.v3.js:4692–4743

(a, b)

  }
  d3.interpolateTransform = d3_interpolateTransform;
  function d3_interpolateTransform(a, b) {
    var s = [], q = [], n, A = d3.transform(a), B = d3.transform(b), ta = A.translate, tb = B.translate, ra = A.rotate, rb = B.rotate, wa = A.skew, wb = B.skew, ka = A.scale, kb = B.scale;
    if (ta[0] != tb[0] || ta[1] != tb[1]) {
      s.push("translate(", null, ",", null, ")");
      q.push({
        i: 1,
        x: d3_interpolateNumber(ta[0], tb[0])
      }, {
        i: 3,
        x: d3_interpolateNumber(ta[1], tb[1])
      });
    } else if (tb[0] || tb[1]) {
      s.push("translate(" + tb + ")");
    } else {
      s.push("");
    }
    if (ra != rb) {
      if (ra - rb > 180) rb += 360; else if (rb - ra > 180) ra += 360;
      q.push({
        i: s.push(s.pop() + "rotate(", null, ")") - 2,
        x: d3_interpolateNumber(ra, rb)
      });
    } else if (rb) {
      s.push(s.pop() + "rotate(" + rb + ")");
    }
    if (wa != wb) {
      q.push({
        i: s.push(s.pop() + "skewX(", null, ")") - 2,
        x: d3_interpolateNumber(wa, wb)
      });
    } else if (wb) {
      s.push(s.pop() + "skewX(" + wb + ")");
    }
    if (ka[0] != kb[0] || ka[1] != kb[1]) {
      n = s.push(s.pop() + "scale(", null, ",", null, ")");
      q.push({
        i: n - 4,
        x: d3_interpolateNumber(ka[0], kb[0])
      }, {
        i: n - 2,
        x: d3_interpolateNumber(ka[1], kb[1])
      });
    } else if (kb[0] != 1 || kb[1] != 1) {
      s.push(s.pop() + "scale(" + kb + ")");
    }
    n = q.length;
    return function(t) {
      var i = -1, o;
      while (++i < n) s[(o = q[i]).i] = o.x(t);
      return s.join("");
    };
  }
  d3.interpolateObject = d3_interpolateObject;
  function d3_interpolateObject(a, b) {
    var i = {}, c = {}, k;