toolkit/javascript/d3/test/geo/azimuthal-test.js
author Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
Thu, 10 Apr 2014 14:20:23 +0200
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require("../env");
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require("../../d3");
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require("../../d3.geo");
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var vows = require("vows"),
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    assert = require("assert");
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var suite = vows.describe("d3.geo.azimuthal");
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suite.addBatch({
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  "azimuthal.stereographic": {
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    topic: function() {
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      return d3.geo.azimuthal().mode("stereographic").translate([0, 0]).scale(100);
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    },
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    "origin": function(azimuthal) {
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      var coords = azimuthal([0, 0]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], 0, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 0, 1e-6);
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    },
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    "Arctic": function(azimuthal) {
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      var coords = azimuthal([0, 85]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], -91.633117, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 85, 1e-6);
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    },
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    "Antarctic": function(azimuthal) {
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      var coords = azimuthal([0, -85]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], 91.633117, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], -85, 1e-6);
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    },
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    "Hawaii": function(azimuthal) {
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      var coords = azimuthal([-180, 0]);
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      assert.equal(coords[0], -Infinity);
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      assert.isTrue(isNaN(coords[1]));
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    },
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    "Phillipines": function(azimuthal) {
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      var coords = azimuthal([180, 0]);
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      assert.equal(coords[0], Infinity);
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      assert.isTrue(isNaN(coords[1]));
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    },
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    "Inversion works for non-zero translation": function() {
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      var azimuthal = d3.geo.azimuthal().mode("stereographic").translate([123, 99]).scale(100),
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          coords = azimuthal([0, 85]),
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          lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 85, 1e-6);
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    }
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  },
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  "azimuthal.orthographic": {
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    topic: function() {
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      return d3.geo.azimuthal().mode("orthographic").translate([0, 0]).scale(100);
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    },
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    "origin": function(azimuthal) {
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      var coords = azimuthal([0, 0]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], 0, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 0, 1e-6);
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    },
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    "Arctic": function(azimuthal) {
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      var coords = azimuthal([0, 85]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], -99.619469, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 85, 1e-6);
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    },
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    "Antarctic": function(azimuthal) {
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      var coords = azimuthal([0, -85]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], 99.619469, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], -85, 1e-6);
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    },
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    "Hawaii": function(azimuthal) {
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      var coords = azimuthal([-180, 0]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], 0, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 0, 1e-6);
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    },
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    "Phillipines": function(azimuthal) {
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      var coords = azimuthal([180, 0]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], 0, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 0, 1e-6);
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    },
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    "Inversion works for non-zero translation": function() {
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      var azimuthal = d3.geo.azimuthal().mode("orthographic").translate([123, 99]).scale(100),
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          coords = azimuthal([0, 85]),
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          lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 85, 1e-6);
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    }
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parents:
diff changeset
   108
  },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   109
  "azimuthal.gnomonic": {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   110
    topic: function() {
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   111
      return d3.geo.azimuthal().mode("gnomonic").translate([0, 0]).scale(100);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   112
    },
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   113
    "origin": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   114
      var coords = azimuthal([0, 0]);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   115
      assert.inDelta(coords[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   116
      assert.inDelta(coords[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   117
      var lonlat = azimuthal.invert(coords);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   118
      assert.inDelta(lonlat[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   119
      assert.inDelta(lonlat[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   120
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   121
    "Arctic": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   122
      var coords = azimuthal([0, 85]);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   123
      assert.inDelta(coords[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   124
      assert.inDelta(coords[1], -1143.005230, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   125
      var lonlat = azimuthal.invert(coords);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   126
      assert.inDelta(lonlat[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   127
      assert.inDelta(lonlat[1], 85, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   128
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   129
    "Antarctic": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   130
      var coords = azimuthal([0, -85]);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   131
      assert.inDelta(coords[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   132
      assert.inDelta(coords[1], 1143.005230, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   133
      var lonlat = azimuthal.invert(coords);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   134
      assert.inDelta(lonlat[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   135
      assert.inDelta(lonlat[1], -85, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   136
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   137
    "Hawaii": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   138
      var coords = azimuthal([-180, 0]);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   139
      assert.inDelta(coords[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   140
      assert.inDelta(coords[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   141
      var lonlat = azimuthal.invert(coords);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   142
      assert.inDelta(lonlat[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   143
      assert.inDelta(lonlat[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   144
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   145
    "Phillipines": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   146
      var coords = azimuthal([180, 0]);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   147
      assert.inDelta(coords[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   148
      assert.inDelta(coords[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   149
      var lonlat = azimuthal.invert(coords);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   150
      assert.inDelta(lonlat[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   151
      assert.inDelta(lonlat[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   152
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   153
    "Inversion works for non-zero translation": function() {
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   154
      var azimuthal = d3.geo.azimuthal().mode("stereographic").translate([123, 99]).scale(100),
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   155
          coords = azimuthal([0, 85]),
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   156
          lonlat = azimuthal.invert(coords);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   157
      assert.inDelta(lonlat[0], 0, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   158
      assert.inDelta(lonlat[1], 85, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   159
    }
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   160
  },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   161
  "azimuthal.equidistant": {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   162
    topic: function() {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   163
      return d3.geo.azimuthal().mode("equidistant").translate([0, 0]).scale(100);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   164
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   165
    "origin": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   166
      var coords = azimuthal([0, 0]);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   167
      assert.inDelta(coords[0], 0, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   168
      assert.inDelta(coords[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   169
      var lonlat = azimuthal.invert(coords);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   170
      assert.inDelta(lonlat[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   171
      assert.inDelta(lonlat[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   172
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   173
    "Arctic": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   174
      var coords = azimuthal([0, 85]);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   175
      assert.inDelta(coords[0], 0, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   176
      assert.inDelta(coords[1], -148.352986, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   177
      var lonlat = azimuthal.invert(coords);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   178
      assert.inDelta(lonlat[0], 0, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   179
      assert.inDelta(lonlat[1], 85, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   180
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   181
    "Antarctic": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   182
      var coords = azimuthal([0, -90]);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   183
      assert.inDelta(coords[0], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   184
      assert.inDelta(coords[1], 157.079632, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   185
      var lonlat = azimuthal.invert(coords);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   186
      assert.inDelta(lonlat[0], 0, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   187
      assert.inDelta(lonlat[1], -90, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   188
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   189
    "Hawaii": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   190
      var coords = azimuthal([-180, 0]);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   191
      assert.inDelta(coords[0], -314.159265, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   192
      assert.inDelta(coords[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   193
      var lonlat = azimuthal.invert(coords);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   194
      assert.inDelta(lonlat[0], -180, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   195
      assert.inDelta(lonlat[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   196
    },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   197
    "Phillipines": function(azimuthal) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   198
      var coords = azimuthal([180, 0]);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   199
      assert.inDelta(coords[0], 314.159265, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   200
      assert.inDelta(coords[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   201
      var lonlat = azimuthal.invert(coords);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   202
      assert.inDelta(lonlat[0], 180, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   203
      assert.inDelta(lonlat[1], 0, 1e-6);
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   204
    },
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   205
    "Inversion works for non-zero translation": function() {
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   206
      var azimuthal = d3.geo.azimuthal().mode("stereographic").translate([123, 99]).scale(100),
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   207
          coords = azimuthal([0, 85]),
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   208
          lonlat = azimuthal.invert(coords);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   209
      assert.inDelta(lonlat[0], 0, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   210
      assert.inDelta(lonlat[1], 85, 1e-6);
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   211
    }
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   212
  },
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   213
  "azimuthal.equalarea": {
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   214
    topic: function() {
c0b4a8b5a012 add toolkit.html + démonstrateurs
Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
diff changeset
   215
      return d3.geo.azimuthal().mode("equalarea").translate([0, 0]).scale(100);
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    },
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    "origin": function(azimuthal) {
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      var coords = azimuthal([0, 0]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], 0, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 0, 1e-6);
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    },
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    "Arctic": function(azimuthal) {
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      var coords = azimuthal([0, 85]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], -135.118041, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 85, 1e-6);
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    },
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    "Antarctic": function(azimuthal) {
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      var coords = azimuthal([0, -90]);
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      assert.inDelta(coords[0], 0, 1e-6);
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      assert.inDelta(coords[1], 141.421356, 1e-6);
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      var lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 180, 1e-6);
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      assert.inDelta(lonlat[1], -90, 1e-6);
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    },
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    "Hawaii": function(azimuthal) {
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      var coords = azimuthal([-180, 0]);
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      assert.equal(coords[0], -Infinity);
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      assert.isTrue(isNaN(coords[1]));
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    },
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    "Phillipines": function(azimuthal) {
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      var coords = azimuthal([180, 0]);
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      assert.equal(coords[0], Infinity);
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      assert.isTrue(isNaN(coords[1]));
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    },
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    "Inversion works for non-zero translation": function() {
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      var azimuthal = d3.geo.azimuthal().mode("stereographic").translate([123, 99]).scale(100),
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          coords = azimuthal([0, 85]),
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          lonlat = azimuthal.invert(coords);
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      assert.inDelta(lonlat[0], 0, 1e-6);
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      assert.inDelta(lonlat[1], 85, 1e-6);
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    }
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  }
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});
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suite.export(module);