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require("../env");

var vows = require("vows"),
    assert = require("assert");

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

suite.addBatch({
  "path": {
    topic: function() {
      return d3.geo.path()
          .context(testContext)
          .projection(d3.geo.equirectangular()
            .scale(900 / Math.PI)
            .precision(0));
    },

    "Point": function(path) {
      path({
        type: "Point",
        coordinates: [-63, 18]
      });
      assert.deepEqual(testContext.buffer(), [
        {type: "moveTo", x: 165, y: 160},
        {type: "arc", x: 165, y: 160, r: 4.5}
      ]);
    },

    "MultiPoint": function(path) {
      path({
        type: "MultiPoint",
        coordinates: [[-63, 18], [-62, 18], [-62, 17]]
      });
      assert.deepEqual(testContext.buffer(), [
        {type: "moveTo", x: 165, y: 160}, {type: "arc", x: 165, y: 160, r: 4.5},
        {type: "moveTo", x: 170, y: 160}, {type: "arc", x: 170, y: 160, r: 4.5},
        {type: "moveTo", x: 170, y: 165}, {type: "arc", x: 170, y: 165, r: 4.5}
      ]);
    },

    "LineString": function(path) {
      path({
        type: "Feature",
        geometry: {
          type: "LineString",
          coordinates: [[-63, 18], [-62, 18], [-62, 17]]
        },
      });
      assert.deepEqual(testContext.buffer(), [
        {type: "moveTo", x: 165, y: 160},
        {type: "lineTo", x: 170, y: 160},
        {type: "lineTo", x: 170, y: 165}
      ]);
    },

    "Polygon": function(path) {
      path({
        type: "Feature",
        geometry: {
          type: "Polygon",
          coordinates: [[[-63, 18], [-62, 18], [-62, 17], [-63, 18]]]
        },
      });
      assert.deepEqual(testContext.buffer(), [
        {type: "moveTo", x: 165, y: 160},
        {type: "lineTo", x: 170, y: 160},
        {type: "lineTo", x: 170, y: 165},
        {type: "closePath"}
      ]);
    },

    "GeometryCollection": function(path) {
      path({
        type: "GeometryCollection",
        geometries: [{type: "Point", coordinates: [0, 0]}]
      });
      assert.deepEqual(testContext.buffer(), [
        {type: "moveTo", x: 480, y: 250}, {type: "arc", x: 480, y: 250, r: 4.5}
      ]);
    },

    "FeatureCollection": function(path) {
      path({
        type: "FeatureCollection",
        features: [{type: "Feature", geometry: {type: "Point", coordinates: [0, 0]}}]
      });
      assert.deepEqual(testContext.buffer(), [
        {type: "moveTo", x: 480, y: 250}, {type: "arc", x: 480, y: 250, r: 4.5}
      ]);
    },

    "with a null projection": {
      topic: function() {
        return d3.geo.path().context(testContext).projection(null);
      },
      "Polygon": function(path) {
        path({
          type: "Feature",
          geometry: {
            type: "Polygon",
            coordinates: [[[-63, 18], [-62, 18], [-62, 17], [-63, 18]]]
          },
        });
        assert.deepEqual(testContext.buffer(), [
          {type: "moveTo", x: -63, y: 18},
          {type: "lineTo", x: -62, y: 18},
          {type: "lineTo", x: -62, y: 17},
          {type: "closePath"}
        ]);
      }
    },

    "winding order": {
      "tiny polygon": function(path) {
        path({type: "Polygon", coordinates: [[
          [-0.06904102953339501, 0.346043661846373],
          [-6.725674252975136e-15, 0.3981303360336475],
          [-6.742247658534323e-15, -0.08812465346531581],
          [-0.17301258217724075, -0.12278150669440671],
          [-0.06904102953339501, 0.346043661846373]]]});
        assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 1);
      }
    },

    "with no context": {
      topic: function(path) {
        return d3.geo.path().projection(path.projection());
      },
      "returns null when passed null or undefined": function(path) {
        assert.equal(path(null), null);
        assert.equal(path(undefined), null);
        assert.equal(path(), null);
      },
      "returns null with bogus type name": function(path) {
        assert.equal(path({
          type: "Feature",
          geometry: {
            type: "__proto__",
            coordinates: [[[-63.03, 18.02], [-63.14, 18.06], [-63.01, 18.07], [-63.03, 18.02]]]
          },
        }), null);
      }
    },

    "projection": {
      "returns the current projection when called with no arguments": function() {
        var path = d3.geo.path(), projection = d3.geo.albers();
        path.projection(projection);
        assert.strictEqual(path.projection(), projection);
      }
    },

    "pointRadius": {
      "returns the current point radius when called with no arguments": function() {
        var path = d3.geo.path(), radius = function() { return 5; };
        assert.strictEqual(path.pointRadius(), 4.5);
        assert.strictEqual(path.pointRadius(radius).pointRadius(), radius);
      },
      "coerces point radius to a number": {
        "constant": function() {
          var path = d3.geo.path();
          assert.strictEqual(path.pointRadius("6").pointRadius(), 6);
        },
        "function": function(path) {
          var radius = path.pointRadius();
          try {
            path.pointRadius(function() { return "6"; })({type: "Point", coordinates: [0, 0]});
            assert.strictEqual(testContext.buffer().filter(function(d) { return d.type === "arc"; })[0].r, 6);
          } finally {
            path.pointRadius(radius);
          }
        }
      }
    },

    "area": {
      topic: function(path) {
        return path.area;
      },
      "no holes": function(area) {
        assert.strictEqual(area({type: "Polygon", coordinates: [[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]]]}), 25);
      },
      "holes": function(area) {
        assert.strictEqual(area({type: "Polygon", coordinates: [[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]],
                                                                [[100.2, .2], [100.8, .2], [100.8, .8], [100.2, .8], [100.2, .2]]]}), 16);
      },
      "Sphere": function(area) {
        assert.strictEqual(area({type: "Sphere"}), 1620000);
      }
    },

    "centroid": {
      topic: function(path) {
        return path.centroid;
      },
      "Point": function(centroid) {
        assert.deepEqual(centroid({type: "Point", coordinates: [0, 0]}), [480, 250]);
      },
      "MultiPoint": {
        "empty": function(centroid) {
          assert.isUndefined(centroid({type: "MultiPoint", coordinates: []}));
        },
        "single point": function(centroid) {
          assert.deepEqual(centroid({type: "MultiPoint", coordinates: [[0, 0]]}), [480, 250]);
        },
        "two points": function(centroid) {
          assert.deepEqual(centroid({type: "MultiPoint", coordinates: [[-122, 37], [-74, 40]]}), [-10, 57.5]);
        }
      },
      "LineString": {
        "empty": function(centroid) {
          assert.isUndefined(centroid({type: "LineString", coordinates: []}));
        },
        "two points": function(centroid) {
          assert.deepEqual(centroid({type: "LineString", coordinates: [[100, 0], [0, 0]]}), [730, 250]);
          assert.deepEqual(centroid({type: "LineString", coordinates: [[0, 0], [100, 0], [101, 0]]}), [732.5, 250]);
        },
        "two points, one unique": function(centroid) {
          assert.isUndefined(centroid({type: "LineString", coordinates: [[-122, 37], [-122, 37]]}));
          assert.isUndefined(centroid({type: "LineString", coordinates: [[ -74, 40], [ -74, 40]]}));
        },
        "three points; two unique": function(centroid) {
          assert.deepEqual(centroid({type: "LineString", coordinates: [[-122, 37], [-74, 40], [-74, 40]]}), [-10, 57.5]);
        },
        "three points": function(centroid) {
          assert.inDelta(centroid({type: "LineString", coordinates: [[-122, 37], [-74, 40], [-100, 0]]}), [17.389135, 103.563545], 1e-6);
        }
      },
      "MultiLineString": function(centroid) {
        assert.deepEqual(centroid({type: "MultiLineString", coordinates: [[[100, 0], [0, 0]], [[-10, 0], [0, 0]]]}), [705, 250]);
      },
      "Polygon": {
        "single ring": function(centroid) {
          assert.deepEqual(centroid({type: "Polygon", coordinates: [[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]]]}), [982.5, 247.5]);
        },
        "zero area": function(centroid) {
          assert.isUndefined(centroid({type: "Polygon", coordinates: [[[1, 0], [2, 0], [3, 0], [1, 0]]]}));
        },
        "two rings, one zero area": function(centroid) {
          assert.deepEqual(centroid({type: "Polygon", coordinates: [
            [[100,   0], [100,   1], [101,   1], [101,   0], [100, 0]],
            [[100.1, 0], [100.2, 0], [100.3, 0], [100.1, 0]
          ]]}), [982.5, 247.5]);
        },
        "clockwise exterior, anticlockwise interior": function(centroid) {
          assert.inDelta(centroid({
            type: "Polygon",
            coordinates: [
              [[-2, -2], [2, -2], [2, 2], [-2, 2], [-2, -2]].reverse(),
              [[ 0, -1], [1, -1], [1, 1], [ 0, 1], [ 0, -1]]
            ]
          }), [479.642857, 250], 1e-6);
        }
      },
      "MultiPolygon": {
        "empty": function(centroid) {
          assert.isUndefined(centroid({type: "MultiPolygon", coordinates: []}));
        },
        "single polygon": function(centroid) {
          assert.deepEqual(centroid({type: "MultiPolygon", coordinates: [[[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]]]]}), [982.5, 247.5]);
        },
        "two polygons": function(centroid) {
          assert.deepEqual(centroid({type: "MultiPolygon", coordinates: [
            [[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]]],
            [[[0, 0], [1, 0], [1, -1], [0, -1], [0, 0]]]
          ]}), [732.5, 250]);
        },
        "two polygons, one zero area": function(centroid) {
          assert.deepEqual(centroid({type: "MultiPolygon", coordinates: [
            [[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]]],
            [[[0, 0], [1, 0], [2, 0], [0, 0]]]
          ]}), [982.5, 247.5]);
        }
      },
      "GeometryCollection": {
        "Point": function(centroid) {
          assert.deepEqual(centroid({type: "GeometryCollection", geometries: [{type: "Point", coordinates: [0, 0]}]}), [480, 250]);
        },
        "Point and LineString": function(centroid) {
          assert.deepEqual(centroid({type: "GeometryCollection", geometries: [
            {type: "LineString", coordinates: [[179, 0], [180, 0]]},
            {type: "Point", coordinates: [0, 0]}
          ]}), [1377.5, 250]);
        },
        "Point, LineString and Polygon": function(centroid) {
          assert.deepEqual(centroid({type: "GeometryCollection", geometries: [
            {type: "Polygon", coordinates: [[[-180, 0], [-180, 1], [-179, 1], [-179, 0], [-180, 0]]]},
            {type: "LineString", coordinates: [[179, 0], [180, 0]]},
            {type: "Point", coordinates: [0, 0]}
          ]}), [-417.5, 247.5]);
        }
      },
      "FeatureCollection": {
        "Point": function(centroid) {
          assert.deepEqual(centroid({type: "FeatureCollection", features: [{type: "Feature", geometry: {type: "Point", coordinates: [0, 0]}}]}), [480, 250]);
        },
        "Point and LineString": function(centroid) {
          assert.deepEqual(centroid({type: "FeatureCollection", features: [
            {type: "Feature", geometry: {type: "LineString", coordinates: [[179, 0], [180, 0]]}},
            {type: "Feature", geometry: {type: "Point", coordinates: [0, 0]}}
          ]}), [1377.5, 250]);
        },
        "Point, LineString and Polygon": function(centroid) {
          assert.deepEqual(centroid({type: "FeatureCollection", features: [
            {type: "Feature", geometry: {type: "Polygon", coordinates: [[[-180, 0], [-180, 1], [-179, 1], [-179, 0], [-180, 0]]]}},
            {type: "Feature", geometry: {type: "LineString", coordinates: [[179, 0], [180, 0]]}},
            {type: "Feature", geometry: {type: "Point", coordinates: [0, 0]}}
          ]}), [-417.5, 247.5]);
        }
      },
      "Sphere": function(centroid) {
        assert.deepEqual(centroid({type: "Sphere"}), [480, 250]);
      },
      "rotate([180, -248])": function() {
        d3.geo.path()
            .context(testContext)
            .projection(d3.geo.equirectangular()
              .rotate([-180, -248])
              .scale(900 / Math.PI)
              .precision(0))({type: "Polygon",  coordinates: [[[-175.03150315031502, 66.57410661866186], [-174.34743474347434, 66.33097912391239], [-174.5994599459946, 67.0603616081608], [-171.86318631863185, 66.90406536153614], [-169.9189918991899, 65.96628788178816], [-170.89108910891088, 65.53213164116411], [-172.54725472547256, 65.42793414341432], [-172.5832583258326, 64.45542416441643], [-172.97929792979298, 64.2470291689169], [-173.91539153915392, 64.28176166816681], [-174.67146714671466, 64.62908666066605], [-176.003600360036, 64.90694665466546], [-176.21962196219621, 65.34110289528951], [-177.22772277227722, 65.51476539153916], [-178.37983798379838, 65.37583539453945], [-178.91989198919893, 65.72316038703869], [-178.7038703870387, 66.10521787878787], [-179.8919891989199, 65.8620903840384], [-179.45994599459945, 65.3932016441644], [-180, 64.97641165316531], [-180, 68.95328281728172], [-177.55175517551754, 68.18916783378336], [-174.95949594959495, 67.19929160516051], [-175.03150315031502, 66.57410661866186]]]});
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
          {type: "moveTo", x: 1370, y: 243}
        ]);
      }
    },

    "clipAngle(90)": {
      topic: function() {
        return d3.geo.path()
            .context(testContext)
            .projection(d3.geo.equirectangular()
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      "Point": function(path) {
        path({
          type: "Point",
          coordinates: [-63, 18]
        });
        assert.deepEqual(testContext.buffer(), [
          {type: "moveTo", x: 165, y: 160}, {type: "arc", x: 165, y: 160, r: 4.5}
        ]);
      },
      "MultiPoint": function(path) {
        path({
          type: "MultiPoint",
          coordinates: [[-63, 18], [-62, 18], [-62, 17]]
        });
        assert.deepEqual(testContext.buffer(), [
          {type: "moveTo", x: 165, y: 160}, {type: "arc", x: 165, y: 160, r: 4.5},
          {type: "moveTo", x: 170, y: 160}, {type: "arc", x: 170, y: 160, r: 4.5},
          {type: "moveTo", x: 170, y: 165}, {type: "arc", x: 170, y: 165, r: 4.5}
        ]);
      },
      "Polygon": {
        "inserts exterior along clip edge if polygon interior surrounds it": function(path) {
          path({type: "Polygon", coordinates: [[[80, -80], [80, 80], [-80, 80], [-80, -80], [80, -80]]]});
          assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 2);
        },
        "inserts exterior along clip edge if polygon exterior surrounds it": function(path) {
          path({type: "Polygon", coordinates: [[[100, -80], [-100, -80], [-100, 80], [100, 80], [100, -80]]]});
          assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 1);
        }
      },
      "rotate([-17, -451])": function() {
        var pole = d3.range(-180, 180, 10).map(function(x) { return [x, 70]; });
        pole.push(pole[0]);
        d3.geo.path()
            .context(testContext)
            .projection(d3.geo.equirectangular()
              .rotate([-17, -451])
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90))({type: "Polygon", coordinates: [pole]});
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
          {type: "moveTo", x: 510, y: 160},
          {type: "moveTo", x:  87, y: 700}
        ]);
      },
      "rotate([71.03, 42.37])": {
        topic: function() {
          return d3.geo.path()
              .context(testContext)
              .projection(d3.geo.equirectangular()
                .rotate([71.03, 42.37])
                .scale(900 / Math.PI)
                .precision(0)
                .clipAngle(90));
        },
        /*
        "grid component": function(path) {
          var yStepsBig = d3.range(-90, 90, 10);
          path({type: "LineString", coordinates: yStepsBig.map(function(y) { return [110, y]; })});
          assert.inDelta(testContext.buffer(), [[
            [109.538009, -90],
            [110, -80],
            [110, -70],
            [110, -60],
            [110, -50],
            [110, -47.625390]
          ]], 1e-6);
        },
        */
        "can completely clip a LineString": function(path) {
          path({type: "LineString", coordinates: [[90.0, -42.37], [95.0, -42.37], [90.0, -42.37]]});
          assert.deepEqual(testContext.buffer(), []);
        },
        "doesn't insert a duplicate point": function(path) {
          path({type: "LineString", coordinates: [[0, 0]]});
          assert.deepEqual(testContext.buffer(), [{type: "moveTo", x: 859, y: 187}]);
        },
        "Point": {
          "visible": function(path) {
            path({type: "Point", coordinates: [0, 0]});
            assert.deepEqual(testContext.buffer(), [{type: "moveTo", x: 859, y: 187}, {type: "arc", x: 859, y: 187, r: 4.5}]);
          },
          "invisible": function(path) {
            path({type: "Point", coordinates: [-180, 0]});
            assert.deepEqual(testContext.buffer(), []);
          }
        },
        "MultiPoint": function(path) {
          path({type: "MultiPoint", coordinates: [[0, 0], [-180, 0]]});
          assert.deepEqual(testContext.buffer(), [{type: "moveTo", x: 859, y: 187}, {type: "arc", x: 859, y: 187, r: 4.5}]);
        }
      },
      "rotate(-24, -175.5])": {
        topic: function() {
          return d3.geo.path()
              .context(testContext)
              .projection(d3.geo.equirectangular()
                .rotate([-24, -175.5])
                .scale(900 / Math.PI)
                .precision(0)
                .clipAngle(90));
        },
        "Antarctica": function(path) {
          path(antarctica);
          assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 2);
        }
      },
      "circle.angle(60)": {
        "rotate([0, 0])": function(path) {
          path(d3.geo.circle().angle(60)());
          assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
            {type: "moveTo", x: 276, y: 493}]);
        },
        "rotate([90, 0])": function(path) {
          try {
            path.projection().rotate([90, 0]);
            path(d3.geo.circle().angle(60)());
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
              {type: "moveTo", x: 930, y: 550}]);
          } finally {
            path.projection().rotate([0, 0]);
          }
        },
        "rotate([180, 0])": function(path) {
          try {
            path.projection().rotate([180, 0]);
            path(d3.geo.circle().angle(60)());
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), []);
          } finally {
            path.projection().rotate([0, 0]);
          }
        },
        "rotate([270, 0])": function(path) {
          try {
            path.projection().rotate([270, 0]);
            path(d3.geo.circle().angle(60)());
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
              {type: "moveTo", x: 30, y: -50}]);
          } finally {
            path.projection().rotate([0, 0]);
          }
        }
      },
      "circle.angle(120)": {
        "rotate([0, 0])": function(path) {
          path(d3.geo.circle().angle(120)());
          assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
            {type: "moveTo", x: 87, y: 700}]);
        },
        "rotate([90, 0])": function(path) {
          try {
            path.projection().rotate([90, 0]);
            path(d3.geo.circle().angle(120)());
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
              {type: "moveTo", x: 30, y: 550}]);
          } finally {
            path.projection().rotate([0, 0]);
          }
        },
        "rotate([180, 0])": function(path) {
          try {
            path.projection().rotate([180, 0]);
            path(d3.geo.circle().angle(120)());
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
              {type: "moveTo", x: 276, y: 493},
              {type: "moveTo", x:  87, y: 700}]);
          } finally {
            path.projection().rotate([0, 0]);
          }
        },
        "rotate([270, 0])": function(path) {
          try {
            path.projection().rotate([270, 0]);
            path(d3.geo.circle().angle(120)());
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
              {type: "moveTo", x: 930, y: -50}]);
          } finally {
            path.projection().rotate([0, 0]);
          }
        },
        "rotate([210, 1])": function(path) {
          try {
            path.projection().rotate([210, 1]);
            path(d3.geo.circle().angle(120)());
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 930, y: 250}]);
          } finally {
            path.projection().rotate([0, 0]);
          }
        },
        "rotate([-150, 60])": function(path) {
          try {
            path.projection().rotate([-150, 60]);
            path(d3.geo.circle().angle(120)());
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 30, y: -87}]);
          } finally {
            path.projection().rotate([0, 0]);
          }
        }
      },
      "Sphere": function(path) {
        path({type: "Sphere"});
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 87, y: 700}]);
      }
    },
    "clipAngle(170)": {
      topic: function() {
        return d3.geo.path()
            .context(testContext)
            .projection(d3.geo.equirectangular()
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(170));
      },
      "stripes": {
        "rotate([0, 0])": function(path) {
          path(stripes(80, -80));
          assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
            {type: "moveTo", x: -420, y: -150},
            {type: "moveTo", x: -420, y:  650},
            {type: "moveTo", x: 1331, y:  259}]);
        },
        "rotate([0, -90])": function(path) {
          try {
            path.projection().rotate([0, -90]);
            path(stripes(80, -80));
            assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [
              {type: "moveTo", x:  480, y: 200},
              {type: "moveTo", x: 1350, y: 210}]);
          } finally {
            path.projection().rotate([0, 0]);
          }
        }
      }
    },

    "antimeridian cutting": {
      "rotate([98, 0])": {
        topic: function() {
          return d3.geo.path()
              .context(testContext)
              .projection(d3.geo.equirectangular()
                .scale(900 / Math.PI)
                .rotate([98, 0])
                .precision(0));
        },
        "small U.S. county polygons": {
          "Keweenaw": function(path) {
            path({
              type: "Polygon",
              coordinates: [[[-88.23013, 47.198326], [-88.514931, 47.285957], [-88.383484, 47.285957], [-88.23013, 47.198326]]]
            });
            assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 1);
          },
          "Accomack": function(path) {
            path({
              type: "MultiPolygon",
              coordinates: [
                [[[-75.397659, 38.013497], [-75.244304, 38.029928], [-75.666029, 37.465803], [-75.939876, 37.547957], [-75.671506, 37.95325], [-75.622213, 37.991589], [-75.397659, 38.013497]]],
                [[[-76.016553, 37.95325], [-76.043938, 37.95325], [-75.994645, 37.95325], [-76.016553, 37.95325]]]
              ]
            });
            assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 2);
          },
          "Hopewell": function(path) {
            path({
              type: "Polygon",
              coordinates: [[[-77.298157, 37.312448], [-77.298157, 37.312448], [-77.336496, 37.312448], [-77.281726, 37.312448], [-77.298157, 37.312448]]]
            });
            assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 1);
          }
        }
      },
      "rotate([330, 232])": {
        topic: function() {
          return d3.geo.path()
              .context(testContext)
              .projection(d3.geo.equirectangular()
                .rotate([330, 232])
                .scale(900 / Math.PI)
                .precision(0));
        },
        "degenerate points": function(path) {
          path(d3.geo.circle().angle(30)());
          assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 2);
        }
      },
      "rotate([34.5, 90])": {
        topic: function() {
          return d3.geo.path()
              .context(testContext)
              .projection(d3.geo.equirectangular()
                .rotate([34.5, 90])
                .scale(900 / Math.PI)
                .precision(0));
        },
        "clip point ordering": function(path) {
          var line = d3.range(-90,  180,  10).map(function(x) { return [x, 20]; })
             .concat(d3.range(170, -100, -10).map(function(x) { return [x,  0]; }))
             .concat([[-90, 20]]);
          path({type: "Polygon", coordinates: [line]});
          assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 3);
        }
      }
    },

    "stereographic.precision(1)": {
      topic: function() {
        return d3.geo.path()
            .context(testContext)
            .projection(d3.geo.stereographic()
              .precision(1));
      },
      "correctly resamples points on antimeridian": function(path) {
        path({type: "LineString", coordinates: [[0, 90], [90, 0]]});
        assert.deepEqual(testContext.buffer(), [
          {type: "moveTo", x: 480, y: 100},
          {type: "lineTo", x: 509, y: 103},
          {type: "lineTo", x: 537, y: 111},
          {type: "lineTo", x: 563, y: 125},
          {type: "lineTo", x: 586, y: 144},
          {type: "lineTo", x: 605, y: 167},
          {type: "lineTo", x: 619, y: 193},
          {type: "lineTo", x: 627, y: 221},
          {type: "lineTo", x: 630, y: 250}
        ]);
      }
    },
    "resampling near poles": {
      topic: function() {
        return d3.geo.path()
            .context(testContext)
            .projection(d3.geo.albers()
              .scale(140)
              .rotate([0, 0])
              .precision(1));
      },
      "rotate([0, 0])": function(path) {
        path({type: "LineString", coordinates: [[0, 88], [180, 89]]});
        assert.isTrue(testContext.buffer().filter(function(d) { return d.type === "lineTo"; }).length > 1);
        path({type: "LineString", coordinates: [[180, 90], [1, 89.5]]});
        assert.isTrue(testContext.buffer().filter(function(d) { return d.type === "lineTo"; }).length > 1);
      },
      "rotate([11.5, 285])": function(path) {
        try {
          path.projection().rotate([11.5, 285]);
          path({type: "LineString", coordinates: [[170, 20], [170, 0]]});
          assert.isTrue(testContext.buffer().filter(function(d) { return d.type === "lineTo"; }).length > 1);
        } finally {
          path.projection().rotate([0, 0]);
        }
      }
    },
    "rotate([0, 0, 0])": {
      "longitudes wrap at ±180°": function(path) {
        path({type: "Point", coordinates: [180 + 1e-6, 0]});
        assert.deepEqual(testContext.buffer(), [{type: "moveTo", x: -420, y: 250}, {type: "arc", x: -420, y: 250, r: 4.5}]);
      }
    }
  }
});

var testBuffer = [];

var testContext = {
  arc: function(x, y, r, a0, a1) { testBuffer.push({type: "arc", x: Math.round(x), y: Math.round(y), r: r}); },
  moveTo: function(x, y) { testBuffer.push({type: "moveTo", x: Math.round(x), y: Math.round(y)}); },
  lineTo: function(x, y) { testBuffer.push({type: "lineTo", x: Math.round(x), y: Math.round(y)}); },
  closePath: function() { testBuffer.push({type: "closePath"}); },
  buffer: function() { var result = testBuffer; testBuffer = []; return result; }
};

function feature(o) {
  return {type: "Feature", geometry: o};
}

function stripes(a, b) {
  return {type: "Polygon", coordinates: [a, b].map(function(d, i) {
    var stripe = d3.range(-180, 180, 1).map(function(x) { return [x, d]; });
    stripe.push(stripe[0]);
    return i ? stripe.reverse() : stripe;
  })};
}

var antarctica = {type: "Polygon", coordinates: 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suite.export(module);
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