Source: lib/gl-matrix/dist/esm/common.js

  1. /**
  2.  * @file
  3.  *
  4.  * Summary.
  5.  * <p>High performance matrix and vector operations.</p>
  6.  *
  7.  * @author Brandon Jones
  8.  * @author Colin MacKenzie IV
  9.  * @version 3.4.0
  10.  *
  11.  * @copyright (c) 2015-2021, Brandon Jones, Colin MacKenzie IV.
  12.  * @see <a href="/cwdc/13-webgl/lib/gl-matrix">source</a>
  13.  */
  15. /**
  16.  * Common utilities
  17.  * @module glMatrix
  18.  */
  19. // Configuration Constants
  20. export var EPSILON = 0.000001;
  21. export var ARRAY_TYPE =
  22.     typeof Float32Array !== "undefined" ? Float32Array : Array;
  23. export var RANDOM = Math.random;
  24. export var ANGLE_ORDER = "zyx";
  25. /**
  26.  * Sets the type of array used when creating new vectors and matrices
  27.  *
  28.  * @param {Float32ArrayConstructor | ArrayConstructor} type Array type, such as Float32Array or Array
  29.  */
  31. export function setMatrixArrayType(type) {
  32.     ARRAY_TYPE = type;
  33. }
  34. var degree = Math.PI / 180;
  35. /**
  36.  * Convert Degree To Radian
  37.  *
  38.  * @param {Number} a Angle in Degrees
  39.  */
  41. export function toRadian(a) {
  42.     return a * degree;
  43. }
  44. /**
  45.  * Tests whether or not the arguments have approximately the same value, within an absolute
  46.  * or relative tolerance of glMatrix.EPSILON (an absolute tolerance is used for values less
  47.  * than or equal to 1.0, and a relative tolerance is used for larger values)
  48.  *
  49.  * @param {Number} a The first number to test.
  50.  * @param {Number} b The second number to test.
  51.  * @returns {Boolean} True if the numbers are approximately equal, false otherwise.
  52.  */
  54. export function equals(a, b) {
  55.     return Math.abs(a - b) <= EPSILON * Math.max(1.0, Math.abs(a), Math.abs(b));
  56. }
  57. if (!Math.hypot)
  58.     Math.hypot = function () {
  59.         var y = 0,
  60.             i = arguments.length;
  62.         while (i--) {
  63.             y += arguments[i] * arguments[i];
  64.         }
  66.         return Math.sqrt(y);
  67.     };