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Mini Shell
Mini Shell
define('util/math', [
'underscore',
'exports'
],
/**
* Math utils
*
* @exports util/math
*/
function(
_,
exports
) {
'use strict';
/**
* @param {number} a
* @param {number} b
* @returns {number}
*/
function multiply(a, b) {
return a * b;
}
/**
* @param {number} a
* @param {number} b
* @returns {number}
*/
function add(a, b) {
return a + b;
}
/**
* Normalise a number to no higher than the `cutoff`
* @param {number} cutoff
*
* @example
* [-2, -1, 0, 1, 2].map(math.lowPass(0)) // => [-2, -1, 0, 0, 0]
*
* @returns {Function}
*/
function lowPass(cutoff) {
return function(a){
return Math.min(cutoff, a);
};
}
/**
* Normalise a number to no lower than the `cutoff`
* @param {number} cutoff
*
* @example
* [-2, -1, 0, 1, 2].map(math.highPass(0)) // => [0, 0, 0, 1, 2]
*
* @returns {Function}
*/
function highPass(cutoff) {
return function(a){
return Math.max(cutoff, a);
};
}
/**
* Normalise a number to no lower than the `min` and no higher than `max`
* @param {number} min
* @param {number} max
*
* @example
* [-2, -1, 0, 1, 2].map(math.clamp(-1, 1)) //=> [-1, -1, 0, 1, 1]
*
* @returns {Function}
*/
function clamp(min, max) {
return _.compose(highPass(min), lowPass(max));
}
/**
* Create a Point object that can be used to indicate coordinates/position
* @param {number} x
* @param {number} y
* @returns {Point}
* @constructor
*/
function Point(x, y) {
if (!(this instanceof Point)) {
return new Point(x, y);
}
this.x = x;
this.y = y;
}
/**
* Create a Size object that can be used to indicate a 2D measurement of a thing
* @param {number} width
* @param {number} height
* @returns {Size}
* @constructor
*/
function Size(width, height) {
if (!(this instanceof Size)) {
return new Size(width, height);
}
this.width = width;
this.height = height;
}
exports.add = add;
exports.clamp = clamp;
exports.highPass = highPass;
exports.lowPass = lowPass;
exports.multiply = multiply;
exports.Point = Point;
exports.Size = Size;
});
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