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

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

suite.addBatch({
  "path": {
    topic: load("geo/path").expression("d3.geo.path"),

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

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

      "renders a multipoint": function(p) {
        p({
          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}
        ]);
      },

      "renders a line string": function(p) {
        p({
          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}
        ]);
      },

      "renders a polygon": function(p) {
        p({
          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"}
        ]);
      },

      "renders a geometry collection": function(p) {
        p({
          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}
        ]);
      },

      "renders a feature collection": function(p) {
        p({
          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}
        ]);
      },

      "longitudes wrap at ±180°": function(p) {
        p({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}]);
      },

      "observes the correct winding order of a tiny polygon": function(p) {
        p({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);
      },

      "area": {
        topic: function(p) {
          return p.area;
        },
        "of a polygon with no holes": function(area) {
          assert.strictEqual(area({type: "Polygon", coordinates: [[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]]]}), 25);
        },
        "of a polygon with 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);
        },
        "area of a Sphere": function(area) {
          assert.strictEqual(area({type: "Sphere"}), 1620000);
        }
      },

      "centroid": {
        topic: function(p) {
          return p.centroid;
        },
        "of a point": function(centroid) {
          assert.deepEqual(centroid({type: "Point", coordinates: [0, 0]}), [480, 250]);
        },
        "of an empty multipoint": function(centroid) {
          assert.ok(centroid({type: "MultiPoint", coordinates: []}).every(isNaN));
        },
        "of a singleton multipoint": function(centroid) {
          assert.deepEqual(centroid({type: "MultiPoint", coordinates: [[0, 0]]}), [480, 250]);
        },
        "of a multipoint with two points": function(centroid) {
          assert.deepEqual(centroid({type: "MultiPoint", coordinates: [[-122, 37], [-74, 40]]}), [-10, 57.5]);
        },
        "of an empty linestring": function(centroid) {
          assert.ok(centroid({type: "LineString", coordinates: []}).every(isNaN));
        },
        "of a linestring with 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]);
        },
        "of a linestring with two points, one unique": function(centroid) {
          assert.deepEqual(centroid({type: "LineString", coordinates: [[-122, 37], [-122, 37]]}), [-130, 65]);
          assert.deepEqual(centroid({type: "LineString", coordinates: [[-74, 40], [-74, 40]]}), [110, 50]);
        },
        "of a linestring with three points; two unique": function(centroid) {
          assert.deepEqual(centroid({type: "LineString", coordinates: [[-122, 37], [-74, 40], [-74, 40]]}), [-10, 57.5]);
        },
        "of a linestring with three points": function(centroid) {
          assert.inDelta(centroid({type: "LineString", coordinates: [[-122, 37], [-74, 40], [-100, 0]]}), [17.389135, 103.563545], 1e-6);
        },
        "of a multilinestring": function(centroid) {
          assert.deepEqual(centroid({type: "MultiLineString", coordinates: [[[100, 0], [0, 0]], [[-10, 0], [0, 0]]]}), [705, 250]);
        },
        "of a single-ring polygon": function(centroid) {
          assert.deepEqual(centroid({type: "Polygon", coordinates: [[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]]]}), [982.5, 247.5]);
        },
        "of a zero-area polygon": function(centroid) {
          assert.deepEqual(centroid({type: "Polygon", coordinates: [[[1, 0], [2, 0], [3, 0], [1, 0]]]}), [490, 250]);
        },
        "of a polygon with two rings, one with 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]);
        },
        "of a polygon with clockwise exterior and 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);
        },
        "of an empty multipolygon": function(centroid) {
          assert.ok(centroid({type: "MultiPolygon", coordinates: []}).every(isNaN));
        },
        "of a singleton multipolygon": function(centroid) {
          assert.deepEqual(centroid({type: "MultiPolygon", coordinates: [[[[100, 0], [100, 1], [101, 1], [101, 0], [100, 0]]]]}), [982.5, 247.5]);
        },
        "of a multipolygon with 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]);
        },
        "of a multipolygon with 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]);
        },
        "of a geometry collection with a single point": function(centroid) {
          assert.deepEqual(centroid({type: "GeometryCollection", geometries: [{type: "Point", coordinates: [0, 0]}]}), [480, 250]);
        },
        "of a geometry collection with a point and a linestring": function(centroid) {
          assert.deepEqual(centroid({type: "GeometryCollection", geometries: [
            {type: "LineString", coordinates: [[179, 0], [180, 0]]},
            {type: "Point", coordinates: [0, 0]}
          ]}), [1377.5, 250]);
        },
        "of a geometry collection with a 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]);
        },
        "of a feature collection with a point": function(centroid) {
          assert.deepEqual(centroid({type: "FeatureCollection", features: [{type: "Feature", geometry: {type: "Point", coordinates: [0, 0]}}]}), [480, 250]);
        },
        "of a feature collection with a point and a line string": 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]);
        },
        "of a feature collection with a point, line string 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]);
        },
        "of a sphere": function(centroid) {
          assert.deepEqual(centroid({type: "Sphere"}), [480, 250]);
        }
      }
    },

    "with a null (identity) projection": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(null);
      },
      "renders a Polygon": function(p) {
        p({
          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"}
        ]);
      }
    },

    "with the default context (null) and an identity projection": {
      topic: function(path) {
        return path()
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .precision(0));
      },
      "returns null when passed null or undefined": function(p) {
        assert.equal(p(null), null);
        assert.equal(p(undefined), null);
        assert.equal(p(), null);
      },
      "returns null with bogus type name": function(p) {
        assert.equal(p({
          type: "Feature",
          geometry: {
            type: "__proto__",
            coordinates: [[[-63.03, 18.02], [-63.14, 18.06], [-63.01, 18.07], [-63.03, 18.02]]]
          }
        }), null);
      }
    },

    "with the default context (null) and default projection (albers-usa)": {
      topic: function(path) {
        return path();
      },
      "area of a polygon": function(p) {
        var area = p.area({type: "Polygon", coordinates: [[[-122, 37], [-71, 42], [-80, 25], [-122, 37]]]});
        assert.inDelta(area, 124884.274, 1e-3);
      },
      "bounds of a line string": function(p) {
        assert.inDelta(p.bounds({type: "LineString", coordinates: [[-122, 37], [-74, 40], [-100, 0]]}),
          [[109.378, 189.584], [797.758, 504.660]], 1e-3);
      },
      "centroid of a line string": function(p) {
        assert.inDelta(p.centroid({type: "LineString", coordinates: [[-122, 37], [-74, 40], [-100, 0]]}), [545.131, 253.860], 1e-3);
      }
    },

    "with an equirectangular projection rotated by [180, -248]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .rotate([-180, -248])
              .scale(900 / Math.PI)
              .precision(0));
      },
      "renders a polygon": function(p) {
        p({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}]);
      }
    },

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

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

    "with an equirectangular projection clipped to 90°": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      "renders a point": function(p) {
        p({
          type: "Point",
          coordinates: [-63, 18]
        });
        assert.deepEqual(testContext.buffer(), [
          {type: "moveTo", x: 165, y: 160}, {type: "arc", x: 165, y: 160, r: 4.5}
        ]);
      },
      "renders a multipoint": function(p) {
        p({
          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}
        ]);
      },
      "inserts exterior along clip edge if polygon interior surrounds it": function(p) {
        p({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(p) {
        p({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);
      },
      "renders a small circle of 60°": function(p) {
        p(_.geo.circle().angle(60)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 276, y: 493}]);
      },
      "renders a small circle of 120°": function(p) {
        p(_.geo.circle().angle(120)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 87, y: 700}]);
      }
    },

    "with an equirectangular projection clipped to 90° and rotated by [-17°, -451°]": {
      "renders a polygon": function(path) {
        var pole = _.range(-180, 180, 10).map(function(x) { return [x, 70]; });
        pole.push(pole[0]);
        path()
            .context(testContext)
            .projection(_.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}
        ]);
      }
    },

    "with an equirectangular projection clipped to 90° and rotated by [71.03°, 42.37°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .rotate([71.03, 42.37])
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      /*
      "grid component": function(path) {
        var yStepsBig = _.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(p) {
        p({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(p) {
        p({type: "LineString", coordinates: [[0, 0]]});
        assert.deepEqual(testContext.buffer(), [{type: "moveTo", x: 859, y: 187}]);
      },
      "renders a visible point": function(p) {
        p({type: "Point", coordinates: [0, 0]});
        assert.deepEqual(testContext.buffer(), [{type: "moveTo", x: 859, y: 187}, {type: "arc", x: 859, y: 187, r: 4.5}]);
      },
      "does not render an invisible point": function(p) {
        p({type: "Point", coordinates: [-180, 0]});
        assert.deepEqual(testContext.buffer(), []);
      },
      "renders a multipoint": function(p) {
        p({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}]);
      }
    },

    "with an equirectangular projection clipped to 90° and rotated by [-24°, -175.5°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .rotate([-24, -175.5])
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      "renders Antarctica with no gaps": function(p) {
        p(antarctica);
        assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 2);
      }
    },

    "with an equirectangular projection clipped to 90° and rotated by [90°, 0°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .rotate([90, 0])
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      "renders a small circle of 60°": function(p) {
        p(_.geo.circle().angle(60)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 930, y: 550}]);
      },
      "renders a small circle of 120°": function(p) {
        p(_.geo.circle().angle(120)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 30, y: 550}]);
      }
    },

    "with an equirectangular projection clipped to 90° and rotated by [180°, 0°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .rotate([180, 0])
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      "does not render a small circle of 60°": function(p) {
        p(_.geo.circle().angle(60)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), []);
      },
      "renders a small circle of 120° in two parts": function(p) {
        p(_.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}
        ]);
      }
    },

    "with an equirectangular projection clipped to 90° and rotated by [270°, 0°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .rotate([270, 0])
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      "renders a small circle of 60°": function(p) {
        p(_.geo.circle().angle(60)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 30, y: -50}]);
      },
      "renders a small circle of 120°": function(p) {
        p(_.geo.circle().angle(120)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 930, y: -50}]);
      }
    },

    "with an equirectangular projection clipped to 90° and rotated by [210°, 1°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .rotate([210, 1])
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      "renders a small circle of 120°": function(p) {
        p(_.geo.circle().angle(120)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 930, y: 250}]);
      }
    },

    "with an equirectangular projection clipped to 90° and rotated by [-150°, 60°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .rotate([-150, 60])
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(90));
      },
      "renders a small circle of 120°": function(p) {
        p(_.geo.circle().angle(120)());
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 30, y: -87}]);
      },
      "renders a sphere": function(p) {
        p({type: "Sphere"});
        assert.deepEqual(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }), [{type: "moveTo", x: 87, y: 700}]);
      }
    },

    "with an equirectangular projection clipped to 170°": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(170));
      },
      "renders stripes": function(p) {
        p(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}
        ]);
      }
    },

    "with an equirectangular projection clipped to 170° and rotated by [0°, -90°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .rotate([0, -90])
              .precision(0)
              .clipAngle(170));
      },
      "renders stripes": function(p) {
        p(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}
        ]);
      }
    },

    "with an equirectangular projection clipped to 30°": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(30));
      },
      "clips lines with two invisible endpoints and visible middle": function(p) {
        p({type: "LineString", coordinates: [[-45, 0], [45, 0]]});
        assert.deepEqual(testContext.buffer(), [
          {type: "moveTo", x: 330, y: 250},
          {type: "lineTo", x: 630, y: 250}
        ]);
      }
    },

    "with an equirectangular projection clipped to 150°": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .precision(0)
              .clipAngle(150));
      },
      "clips lines with two visible endpoints and invisible middle": function(p) {
        p({type: "LineString", coordinates: [[135, 0], [-135, 0]]});
        assert.deepEqual(testContext.buffer(), [
          {type: "moveTo", x: 1155, y: 250},
          {type: "lineTo", x: 1230, y: 250},
          {type: "moveTo", x: -270, y: 250},
          {type: "lineTo", x: -195, y: 250}
        ]);
      }
    },

    "with an equirectangular projection rotated by [98°, 0°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .rotate([98, 0])
              .precision(0));
      },
      "renders Keweenaw, a small U.S. county": function(p) {
        p({
          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);
      },
      "renders Accomack, a small U.S. county": function(p) {
        p({
          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);
      },
      "renders Hopewell, a small U.S. county": function(p) {
        p({
          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);
      }
    },

    "with an equirectangular projection rotated by [330°, 232°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .rotate([330, 232])
              .precision(0));
      },
      "renders degenerate points for a small circle of 30°": function(p) {
        p(_.geo.circle().angle(30)());
        assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 2);
      }
    },

    "with an equirectangular projection rotated by [34.5°, 90°]": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .rotate([34.5, 90])
              .precision(0));
      },
      "observes proper clip point ordering for lines": function(p) {
        var line = _.range(-90,  180,  10).map(function(x) { return [x, 20]; })
           .concat(_.range(170, -100, -10).map(function(x) { return [x,  0]; }))
           .concat([[-90, 20]]);
        p({type: "Polygon", coordinates: [line]});
        assert.equal(testContext.buffer().filter(function(d) { return d.type === "moveTo"; }).length, 3);
      }
    },

    "with an equirectangular projection with the viewport clipped to 960×500": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.equirectangular()
              .scale(900 / Math.PI)
              .clipExtent([[0, 0], [960, 500]])
              .precision(0));
      },
      "doesn't generate a redundant closing point": function(p) {
        p({type: "Polygon", coordinates: [[[0, 0], [0, 1], [1, 1], [1, 0], [0, 0]]]});
        assert.deepEqual(testContext.buffer(), [
          {type: "moveTo", x: 480, y: 250},
          {type: "lineTo", x: 480, y: 245},
          {type: "lineTo", x: 485, y: 245},
          {type: "lineTo", x: 485, y: 250},
          {type: "closePath"}
        ]);
      }
    },

    "with a stereographic projection and adaptive resampling": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.stereographic()
              .precision(1));
      },
      "correctly resamples points on antimeridian": function(p) {
        p({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}
        ]);
      }
    },

    "with an Albers projection and adaptive resampling": {
      "correctly resamples near the poles": function(path) {
        var p = path()
            .context(testContext)
            .projection(_.geo.albers()
              .scale(140)
              .rotate([0, 0])
              .precision(1));
        p({type: "LineString", coordinates: [[0, 88], [180, 89]]});
        assert.isTrue(testContext.buffer().filter(function(d) { return d.type === "lineTo"; }).length > 1);
        p({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) {
        var p = path()
            .context(testContext)
            .projection(_.geo.albers()
              .scale(140)
              .rotate([11.5, 285])
              .precision(1));
        p({type: "LineString", coordinates: [[170, 20], [170, 0]]});
        assert.isTrue(testContext.buffer().filter(function(d) { return d.type === "lineTo"; }).length > 1);
      },
      "wavy projection": function(path) {
        var p = path()
            .context(testContext)
            .projection(_.geo.projection(function(λ, φ) {
                return [λ, Math.sin(λ * 4)];
              })
              .scale(140)
              .precision(1));
        p({type: "LineString", coordinates: [[-45, 0], [45, 0]]});
        assert.isTrue(testContext.buffer().filter(function(d) { return d.type === "lineTo"; }).length > 1);
      }
    },

    "with an Albers projection rotated by [11.5°, 285°] and adaptive resampling": {
      topic: function(path) {
        return path()
            .context(testContext)
            .projection(_.geo.albers()
              .scale(140)
              .rotate([11.5, 285])
              .precision(1));
      },
      "correctly resamples near the poles": function(p) {
        p({type: "LineString", coordinates: [[170, 20], [170, 0]]});
        assert.isTrue(testContext.buffer().filter(function(d) { return d.type === "lineTo"; }).length > 1);
      }
    }
  }
});

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

var antarctica = {type: "Polygon", coordinates: [[[-58.61414,-64.15246],[-59.04507,-64.36800],[-59.78934,-64.21122],[-60.61192,-64.30920],[-61.29741,-64.54432],[-62.02210,-64.79909],[-62.51176,-65.09302],[-62.64885,-65.48494],[-62.59012,-65.85721],[-62.12007,-66.19032],[-62.80556,-66.42550],[-63.74569,-66.50384],[-64.29410,-66.83700],[-64.88169,-67.15047],[-65.50842,-67.58161],[-65.66508,-67.95388],[-65.31254,-68.36533],[-64.78371,-68.67890],[-63.96110,-68.91398],[-63.19729,-69.22755],[-62.78595,-69.61941],[-62.57051,-69.99174],[-62.27673,-70.38366],[-61.80666,-70.71676],[-61.51290,-71.08904],[-61.37580,-72.01007],[-61.08197,-72.38235],[-61.00366,-72.77426],[-60.69026,-73.16617],[-60.82736,-73.69524],[-61.37580,-74.10674],[-61.96336,-74.43984],[-63.29520,-74.57699],[-63.74569,-74.92974],[-64.35283,-75.26284],[-65.86098,-75.63512],[-67.19281,-75.79191],[-68.44628,-76.00745],[-69.79772,-76.22299],[-70.60072,-76.63449],[-72.20677,-76.67366],[-73.96953,-76.63449],[-75.55597,-76.71288],[-77.24037,-76.71288],[-76.92697,-77.10480],[-75.39929,-77.28106],[-74.28287,-77.55542],[-73.65611,-77.90811],[-74.77253,-78.22163],[-76.49610,-78.12365],[-77.92585,-78.37841],[-77.98466,-78.78991],[-78.02378,-79.18183],[-76.84863,-79.51493],[-76.63322,-79.88721],[-75.36009,-80.25954],[-73.24485,-80.41633],[-71.44294,-80.69062],[-70.01316,-81.00415],[-68.19164,-81.31767],[-65.70427,-81.47445],[-63.25603,-81.74875],[-61.55202,-82.04269],[-59.69141,-82.37585],[-58.71212,-82.84610],[-58.22248,-83.21843],[-57.00811,-82.86569],[-55.36289,-82.57175],[-53.61977,-82.25823],[-51.54364,-82.00352],[-49.76134,-81.72917],[-47.27393,-81.70958],[-44.82570,-81.84673],[-42.80836,-82.08191],[-42.16202,-81.65082],[-40.77143,-81.35689],[-38.24481,-81.33730],[-36.26666,-81.12171],[-34.38639,-80.90617],[-32.31029,-80.76902],[-30.09709,-80.59265],[-28.54980,-80.33793],[-29.25490,-79.98519],[-29.68580,-79.63250],[-29.68580,-79.26022],[-31.62480,-79.29939],[-33.68132,-79.45613],[-35.63991,-79.45613],[-35.91410,-79.08385],[-35.77700,-78.33924],[-35.32654,-78.12365],[-33.89676,-77.88852],[-32.21236,-77.65345],[-30.99805,-77.35951],[-29.78373,-77.06557],[-28.88277,-76.67366],[-27.51175,-76.49734],[-26.16033,-76.36014],[-25.47482,-76.28180],[-23.92755,-76.24258],[-22.45859,-76.10543],[-21.22469,-75.90947],[-20.01037,-75.67434],[-18.91354,-75.43921],[-17.52298,-75.12569],[-16.64158,-74.79253],[-15.70149,-74.49860],[-15.40771,-74.10674],[-16.46532,-73.87161],[-16.11278,-73.46011],[-15.44685,-73.14654],[-14.40880,-72.95058],[-13.31197,-72.71545],[-12.29350,-72.40193],[-11.51006,-72.01007],[-11.02043,-71.53976],[-10.29577,-71.26541],[-9.10101,-71.32422],[-8.61138,-71.65733],[-7.41662,-71.69650],[-7.37745,-71.32422],[-6.86823,-70.93231],[-5.79098,-71.03028],[-5.53637,-71.40261],[-4.34166,-71.46137],[-3.04898,-71.28505],[-1.79549,-71.16743],[-0.65948,-71.22624],[-0.22863,-71.63774],[0.86819,-71.30463],[1.88668,-71.12826],[3.02263,-70.99111],[4.13905,-70.85391],[5.15754,-70.61878],[6.27391,-70.46205],[7.13571,-70.24651],[7.74286,-69.89376],[8.48711,-70.14853],[9.52513,-70.01133],[10.24984,-70.48163],[10.81782,-70.83433],[11.95382,-70.63837],[12.40428,-70.24651],[13.42277,-69.97216],[14.73499,-70.03091],[15.12675,-70.40324],[15.94934,-70.03091],[17.02658,-69.91335],[18.20171,-69.87418],[19.25937,-69.89376],[20.37573,-70.01133],[21.45298,-70.07014],[21.92303,-70.40324],[22.56940,-70.69718],[23.66618,-70.52081],[24.84135,-70.48163],[25.97730,-70.48163],[27.09372,-70.46205],[28.09258,-70.32485],[29.15024,-70.20728],[30.03158,-69.93293],[30.97173,-69.75661],[31.99017,-69.65864],[32.75405,-69.38429],[33.30244,-68.83564],[33.87041,-68.50258],[34.90849,-68.65927],[35.30020,-69.01201],[36.16201,-69.24714],[37.20003,-69.16874],[37.90510,-69.52144],[38.64940,-69.77620],[39.66789,-69.54107],[40.02043,-69.10994],[40.92135,-68.93362],[41.95943,-68.60051],[42.93870,-68.46331],[44.11387,-68.26740],[44.89729,-68.05186],[45.71992,-67.81673],[46.50334,-67.60119],[47.44344,-67.71875],[48.34441,-67.36606],[48.99073,-67.09171],[49.93088,-67.11130],[50.75347,-66.87617],[50.94932,-66.52348],[51.79154,-66.24913],[52.61413,-66.05317],[53.61303,-65.89639],[54.53355,-65.81804],[55.41494,-65.87680],[56.35504,-65.97478],[57.15809,-66.24913],[57.25596,-66.68021],[58.13736,-67.01332],[58.74450,-67.28767],[59.93931,-67.40523],[60.60522,-67.67958],[61.42780,-67.95388],[62.38748,-68.01269],[63.19048,-67.81673],[64.05234,-67.40523],[64.99244,-67.62072],[65.97171,-67.73834],[66.91186,-67.85590],[67.89113,-67.93430],[68.89003,-67.93430],[69.71262,-68.97279],[69.67345,-69.22755],[69.55594,-69.67822],[68.59625,-69.93293],[67.81273,-70.30526],[67.94988,-70.69718],[69.06630,-70.67754],[68.92915,-71.06945],[68.41998,-71.44178],[67.94988,-71.85328],[68.71376,-72.16680],[69.86930,-72.26478],[71.02489,-72.08841],[71.57328,-71.69650],[71.90628,-71.32422],[72.45462,-71.01070],[73.08141,-70.71676],[73.33602,-70.36402],[73.86487,-69.87418],[74.49155,-69.77620],[75.62755,-69.73703],[76.62646,-69.61941],[77.64490,-69.46268],[78.13453,-69.07076],[78.42837,-68.69844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suite.export(module);