Source: common.js

  1. /**
  2.  * Common utilities
  3.  * @module glMatrix
  4.  */
  6. // Configuration Constants
  7. export const EPSILON = 0.000001;
  8. export let ARRAY_TYPE = (typeof Float32Array !== 'undefined') ? Float32Array : Array;
  9. export const RANDOM = Math.random;
  11. /**
  12.  * Sets the type of array used when creating new vectors and matrices
  13.  *
  14.  * @param {Type} type Array type, such as Float32Array or Array
  15.  */
  16. export function setMatrixArrayType(type) {
  17.   ARRAY_TYPE = type;
  18. }
  20. const degree = Math.PI / 180;
  22. /**
  23.  * Convert Degree To Radian
  24.  *
  25.  * @param {Number} a Angle in Degrees
  26.  */
  27. export function toRadian(a) {
  28.   return a * degree;
  29. }
  31. /**
  32.  * Tests whether or not the arguments have approximately the same value, within an absolute
  33.  * or relative tolerance of glMatrix.EPSILON (an absolute tolerance is used for values less
  34.  * than or equal to 1.0, and a relative tolerance is used for larger values)
  35.  *
  36.  * @param {Number} a The first number to test.
  37.  * @param {Number} b The second number to test.
  38.  * @returns {Boolean} True if the numbers are approximately equal, false otherwise.
  39.  */
  40. export function equals(a, b) {
  41.   return Math.abs(a - b) <= EPSILON*Math.max(1.0, Math.abs(a), Math.abs(b));
  42. }