extlib/leaflet/spec/suites/geo/ProjectionSpec.js

   1 describe("Projection.Mercator", function() {
   2         var p = L.Projection.Mercator;
   3
   4         beforeEach(function() {
   5                 function almostEqual(a, b, p) {
   6                         return Math.abs(a - b) <= (p || 1.0E-12);
   7                 };
   8                 this.addMatchers({
   9                         toAlmostEqual: function(expected, margin) {
  10                                 var p1 = this.actual,
  11                                         p2 = expected;
  12                                 return almostEqual(p1.x, p2.x, margin) && almostEqual(p1.y, p2.y, margin);
  13                         }
  14                 });
  15         });
  16
  17
  18         describe("#project", function() {
  19                 it("should do projection properly", function() {
  20                         //edge cases
  21                         expect(p.project(new L.LatLng(0, 0))).toAlmostEqual(new L.Point(0, 0));
  22                         expect(p.project(new L.LatLng(90, 180))).toAlmostEqual(new L.Point(-Math.PI, Math.PI));
  23                         expect(p.project(new L.LatLng(-90, -180))).toAlmostEqual(new L.Point(-Math.PI, -Math.PI));
  24
  25                         expect(p.project(new L.LatLng(50, 30))).toAlmostEqual(new L.Point(0.523598775598, 1.010683188683));
  26                 });
  27         });
  28
  29         describe("#unproject", function() {
  30                 it("should do unprojection properly", function() {
  31                         function pr(point) {
  32                                 return p.project(p.unproject(point));
  33                         }
  34
  35                         expect(pr(new L.Point(0, 0))).toAlmostEqual(new L.Point(0, 0));
  36                         expect(pr(new L.Point(-Math.PI, Math.PI))).toAlmostEqual(new L.Point(-Math.PI, Math.PI));
  37                         expect(pr(new L.Point(-Math.PI, -Math.PI))).toAlmostEqual(new L.Point(-Math.PI, -Math.PI));
  38
  39                         expect(pr(new L.Point(0.523598775598, 1.010683188683))).toAlmostEqual(new L.Point(0.523598775598, 1.010683188683));
  40                 });
  41         });
  42 });