dom/svg/test/matrixUtils.js

   1 /* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
   2  * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /*
   8  * Utilities for testing SVG matrices
   9  */
  10
  11 function createMatrix(a, b, c, d, e, f) {
  12   var svg = document.getElementsByTagName("svg")[0];
  13   var m = svg.createSVGMatrix();
  14   m.a = a;
  15   m.b = b;
  16   m.c = c;
  17   m.d = d;
  18   m.e = e;
  19   m.f = f;
  20   return m;
  21 }
  22
  23 // Lightweight dummy Matrix class for representing arrays that get passed in
  24 function MatrixFromArray(a) {
  25   this.a = a[0];
  26   this.b = a[1];
  27   this.c = a[2];
  28   this.d = a[3];
  29   this.e = a[4];
  30   this.f = a[5];
  31 }
  32
  33 function cmpMatrix(a, b, msg) {
  34   if (a.constructor === Array) {
  35     a = new MatrixFromArray(a);
  36   }
  37   if (b.constructor === Array) {
  38     b = new MatrixFromArray(b);
  39   }
  40
  41   ok(
  42     a.a == b.a &&
  43       a.b == b.b &&
  44       a.c == b.c &&
  45       a.d == b.d &&
  46       a.e == b.e &&
  47       a.f == b.f,
  48     msg + " - got " + formatMatrix(a) + ", expected " + formatMatrix(b)
  49   );
  50 }
  51
  52 function roughCmpMatrix(a, b, msg) {
  53   if (a.constructor === Array) {
  54     a = new MatrixFromArray(a);
  55   }
  56   if (b.constructor === Array) {
  57     b = new MatrixFromArray(b);
  58   }
  59
  60   const tolerance = 1 / 65535;
  61   ok(
  62     Math.abs(b.a - a.a) < tolerance &&
  63       Math.abs(b.b - a.b) < tolerance &&
  64       Math.abs(b.c - a.c) < tolerance &&
  65       Math.abs(b.d - a.d) < tolerance &&
  66       Math.abs(b.e - a.e) < tolerance &&
  67       Math.abs(b.f - a.f) < tolerance,
  68     msg + " - got " + formatMatrix(a) + ", expected " + formatMatrix(b)
  69   );
  70 }
  71
  72 function formatMatrix(m) {
  73   if (m.constructor != Array) {
  74     return "(" + [m.a, m.b, m.c, m.d, m.e, m.f].join(", ") + ")";
  75   }
  76
  77   return "(" + m.join(", ") + ")";
  78 }