Function firstWalk

docs/app/js/sanddance-app.js:138310–138321

(v)

    // APPORTION. After spacing out the children by calling EXECUTE SHIFTS, the
    // node v is placed to the midpoint of its outermost children.
    function firstWalk(v) {
        var children = v.children, siblings = v.parent.children, w = v.i ? siblings[v.i - 1] : null;
        if (children) {
            executeShifts(v);
            var midpoint = (children[0].z + children[children.length - 1].z) / 2;
            if (w) {
                v.z = w.z + separation(v._, w._);
                v.m = v.z - midpoint;
            } else v.z = midpoint;
        } else if (w) v.z = w.z + separation(v._, w._);
        v.parent.A = apportion(v, w, v.parent.A || siblings[0]);
    }
    // Computes all real x-coordinates by summing up the modifiers recursively.
    function secondWalk(v) {
        v._.x = v.z + v.parent.m;