Function scale

src/traces/image/calc.js:48–52

(zero, ratio, min, max)

};

function scale(zero, ratio, min, max) {
    return function(c) {
        return Lib.constrain((c - zero) * ratio, min, max);
    };
}

function constrain(min, max) {
    return function(c) { return Lib.constrain(c, min, max);};