d3-jsnext/test/geo/circle-test.js

d3, but futuristic

require( 'babel/register' );

var vows = require("vows"),
    _ = require("../d3"),
    load = require("../load"),
    assert = require("../assert");

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

suite.addBatch({
  "circle": {
    topic: load("geo/circle").expression("d3.geo.circle"),
    "generates a Polygon": function(circle) {
      var o = circle()();
      assert.equal(o.type, "Polygon");
      assert.inDelta(o.coordinates, [[[-78.69007,-90],[-90,-84],[-90,-78],[-90,-72],[-90,-66],[-90,-60],[-90,-54],[-90,-48],[-90,-42],[-90,-36],[-90,-30],[-90,-24],[-90,-18],[-90,-12],[-90,-6],[-90,0],[-90,6],[-90,12],[-90,18],[-90,24],[-90,30],[-90,36],[-90,42],[-90,48],[-90,54],[-90,60],[-90,66],[-90,72],[-90,78],[-90,84],[-89.59666,90],[90,84],[90,78],[90,72],[90,66],[90,60],[90,54],[90,48],[90,42],[90,36],[90,30],[90,24],[90,18],[90,12],[90,6],[90,0],[90,-6],[90,-12],[90,-18],[90,-24],[90,-30],[90,-36],[90,-42],[90,-48],[90,-54],[90,-60],[90,-66],[90,-72],[90,-78],[90,-84],[89.56977,-90]]], 1e-5);
    },
    "origin([0, 90])": function(circle) {
      var o = circle().origin([0, 90])();
      assert.equal(o.type, "Polygon");
      assert.inDelta(o.coordinates, [_.range(360, -1, -6).map(function(x) { return [x >= 180 ? x - 360 : x, 0]; })], 1e-6);
    },
    "origin([45, 45])": function(circle) {
      var o = circle().origin([45, 45]).angle(0)();
      assert.equal(o.type, "Polygon");
      assert.inDelta(o.coordinates[0][0], [45, 45], 1e-6);
    },
    "first and last points are coincident": function(circle) {
      var o = circle().origin([0, 0]).angle(.02).precision(45)();
      assert.inDelta(o.coordinates[0][0], o.coordinates[0].pop(), 1e-6);
    }
  }
});

suite.export(module);