Created
October 17, 2016 15:40
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Scale an input number between an input range proportionally down to be in an output range.
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// @flow | |
/** | |
* Scale an input number between an input range proportionally down to be | |
* in an output range. | |
* | |
* @param {number} input - Input number. | |
* @param {Array<number, number>} inputRange - The input range. | |
* @param {Array<number, number>} outputRange - The output range. | |
* | |
* @returns {number} | |
*/ | |
const scaleRange = ( | |
input: number, | |
inputRange: Array<number>, | |
outputRange: Array<number> | |
): number => { | |
const [inMin, inMax] = inputRange; | |
const [outMin, outMax] = outputRange; | |
return ((input - inMin) * (outMax - outMin)) / ((inMax - inMin) + outMin); | |
}; | |
export default scaleRange; |
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