Function interpX0X1FromParent

src/traces/sunburst/plot.js:500–520

(pt)

    }

    function interpX0X1FromParent(pt) {
        var parent = pt.parent;
        var parentPrev = prevLookup[helpers.getPtId(parent)];
        var out = {};

        if (parentPrev) {
            // if parent is visible
            var parentChildren = parent.children;
            var ci = parentChildren.indexOf(pt);
            var n = parentChildren.length;
            var interp = interpolate(parentPrev.x0, parentPrev.x1);
            out.x0 = interp(ci / n);
            out.x1 = interp(ci / n);
        } else {
            // w/o visible parent
            // TODO !!! HOW ???
            out.x0 = out.x1 = 0;
        }

        return out;
    }
}

// x[0-1] keys are angles [radians]