Linear mapping a value from domain to range - Node.js Math

Node.js examples for Math:Map Value

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Description

Linear mapping a value from domain to range

Demo Code


/**//from w ww  .j  a va 2s.  c om
     * Linear mapping a value from domain to range
     * @memberOf module:echarts/util/number
     * @param  {(number|Array.<number>)} val
     * @param  {Array.<number>} domain Domain extent domain[0] can be bigger than domain[1]
     * @param  {Array.<number>} range  Range extent range[0] can be bigger than range[1]
     * @param  {boolean} clamp
     * @return {(number|Array.<number>}
*/
linearMap = function (val, domain, range, clamp) {

        var sub = domain[1] - domain[0];

        if (sub === 0) {
            return (range[0] + range[1]) / 2;
        }
        var t = (val - domain[0]) / sub;

        if (clamp) {
            t = Math.min(Math.max(t, 0), 1);
        }

        return t * (range[1] - range[0]) + range[0];
}

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