Math Helpers From Colin

// Restricts a number to the minimum/maximum
function clamp(value, min, max) {
 return Math.min(max, Math.max(min, value));
}

// Linear interpolation
function lerp(value, min, max) {
 return min * (1 - value) + max * value;
}

// Maps 1 set of numbers to another
function map(value, min1, max1, min2, max2) {
 return lerp(normalize(value, min1, max1), min2, max2);
}

// Turns your value into a percentage normalize(5, 0, 10) = 0.5
function normalize(value, min, max) {
 return(value - min) / (max - min);
}