Linear scaling via function currying, from domain to arbitrary range. Inspired by protovis.

scale.js

function scale( domainMin, domainMax ) {
    var rangeMin = 0;
    var rangeMax = 100;
   
    var f = function( value ) {
        var r = (value - domainMin) / (domainMax - domainMin);
        return rangeMin + (r * (rangeMax - rangeMin));
    }

    f.domain = function( newDomainMin, newDomainMax ) {
        domainMin = newDomainMin;
        domainMax = newDomainMax;
        return f;
    };

    f.range = function( newRangeMin, newRangeMax ) {
        rangeMin = newRangeMin;
        rangeMax = newRangeMax;
        return f;
    };

    return f;
}


// var x = scale( 1970, 2011 ).range( 0, 1 );
// console.log( x(1970) )  // 0
// console.log( x(2011) )  // 1
// console.log( x(2000) )  // 0.7317073170731707