Method interpolate

src/common/overlay/levelRenderer/SUtil.js:167–173

(p0, p1, p2, p3, t, t2, t3)

        // inner Function
        function interpolate(p0, p1, p2, p3, t, t2, t3) {
            var v0 = (p2 - p0) * 0.5;
            var v1 = (p3 - p1) * 0.5;
            return (2 * (p1 - p2) + v0 + v1) * t3
                + (-3 * (p1 - p2) - 2 * v0 - v1) * t2
                + v0 * t + p1;
        }
    }

    /**