illtellyoulater

illtellyoulater / range-scaling.js

Last active January 26, 2023 16:14 — forked from fpillet/scale.js

Javascript value scaling between two ranges, the correct way

	function convertRange( value, r1, r2 ) {
	return ( value - r1[ 0 ] ) * ( r2[ 1 ] - r2[ 0 ] ) / ( r1[ 1 ] - r1[ 0 ] ) + r2[ 0 ];
	}

	// example
	convertRange(26, [0, 100], [-2, 2]);
	// = -0.96

	// another example
	convertRange(26, [0, 100.1], [-2, 2]);