require("../env");

require("../../d3");

require("../../d3.geo");

var vows = require("vows"),

    assert = require("assert");

var suite = vows.describe("d3.geo.albers");

suite.addBatch({

  "albers": {

    topic: function() {

      return d3.geo.albers();

    },

    "Arctic": function(albers) {

      var coords = albers([0, 85]);

      assert.inDelta(coords[0], 1031.393796, 1e-6);

      assert.inDelta(coords[1], -714.160436, 1e-6);

      var lonlat = albers.invert(coords);

      assert.inDelta(lonlat[0], 0, 1e-6);

      assert.inDelta(lonlat[1], 85, 1e-6);

    },

    "Antarctic": function(albers) {

      var coords = albers([0, -85]);

      assert.inDelta(coords[0], 2753.458335, 1e-6);

      assert.inDelta(coords[1],  317.371122, 1e-6);

      var lonlat = albers.invert(coords);

      assert.inDelta(lonlat[0], 0, 1e-6);

      assert.inDelta(lonlat[1], -85, 1e-6);

    },

    "Hawaii": function(albers) {

      var coords = albers([-180, 0]);

      assert.inDelta(coords[0], -984.779405, 1e-6);

      assert.inDelta(coords[1],  209.571197, 1e-6);

      var lonlat = albers.invert(coords);

      assert.inDelta(lonlat[0], -180, 1e-6);

      assert.inDelta(lonlat[1], 0, 1e-6);

    },

    "Phillipines": function(albers) {

      var coords = albers([180, 0]);

      assert.inDelta(coords[0],   894.435228, 1e-6);

      assert.inDelta(coords[1], -2927.636630, 1e-6);

      var lonlat = albers.invert(coords);

      assert.inDelta(lonlat[0], 180, 1e-6);

      assert.inDelta(lonlat[1], 0, 1e-6);

    },

    "Inversion works for non-zero translation": function() {

      var albers = d3.geo.albers().translate([123, 99]).scale(100),

          coords = albers([0, 85]),

          lonlat = albers.invert(coords);

      assert.inDelta(lonlat[0], 0, 1e-6);

      assert.inDelta(lonlat[1], 85, 1e-6);

    }

  }

});

suite.export(module);