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at June 13, 2012 02:56 by adrianparr
Initial Code
package com.brunoimbrizi.utils { /** * Class MathUtils * * @author Bruno Imbrizi */ public class MathUtils { /** * Returns a number constrained between min and max. * @param num * @param min * @param max * @return */ public static function constrain(num:Number, min:Number = 0, max:Number = 1):Number { if (num < min) return min; if (num > max) return max; return num; } /** * Returns a random number between min and max. * * @param min * @param max * @return */ public static function randomRange(min:Number, max:Number, round:Boolean = false):Number { var num:Number = (min + Math.random() * (max - min)); if (round) return Math.round(num); return num; } /** * Returns the percentage of a number in a given range. * Example: num = 15 range 10 to 20 // outputs 0.5 * * @param num * @param min * @param max * @param constrainMin Returns 0 if num < min. * @param constrainMax Returns 1 if num > max. * @return */ public static function rangeToPercent(num:Number, min:Number, max:Number, constrainMin:Boolean = false, constrainMax:Boolean = false):Number { if (constrainMin && num < min) return 0; if (constrainMax && num > max) return 1; return (num - min) / (max - min); } /** * Returns the number that corresponds to the percentage in a given range. * Example: percent = 0.5 range 10 to 20 // outputs 15 * * @param percent * @param min * @param max * @return */ public static function percentToRange(percent:Number, min:Number, max:Number):Number { return (percent * (max - min)) + min; } /** * Re-maps a number from one range to another. The output is the same as inputing the result of rangeToPercent() into percentToRange(). * Example: num = 10, min1 = 0, max1 = 100, min2 = 0, max2 = 50 // outputs 5 * @param num * @param min1 * @param max1 * @param min2 * @param max2 * @return */ public static function map(num:Number, min1:Number, max1:Number, min2:Number, max2:Number, round:Boolean = true, constrainMin:Boolean = true, constrainMax:Boolean = true):Number { if (constrainMin && num < min1) return min2; if (constrainMax && num > max1) return max2; var num1:Number = (num - min1) / (max1 - min1); var num2:Number = (num1 * (max2 - min2)) + min2; if (round) return Math.round(num2); return num2; } /** * Converts radians to degrees. * * @param radians * @return */ public static function radiansToDegrees(radians:Number):Number { return (radians * 180 / Math.PI); } /** * Converts degrees to radians. * * @param degrees * @return */ public static function degreesToRadians(degrees:Number):Number { return (degrees * Math.PI / 180); } /** * Returns 1 if the value is >= 0. Returns -1 if the value is < 0. * * @param num * @return */ public static function sign(num:Number):int { if (num < 0) return -1 return 1; } } }
Initial URL
http://brunoimbrizi.com/unbox/wp-content/uploads/2011/03/MathUtils.as
Initial Description
Credit goes to Bruno Imbrizi.
Initial Title
AS3 MathUtils static class
Initial Tags
class, number, math
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ActionScript 3