var vows = require(“vows”),
_ = require("../../"), load = require("../load"), assert = require("../assert");
var suite = vows.describe(“d3.geo.area”);
var π = Math.PI;
suite.addBatch({
"area": { topic: load("geo/area").expression("d3.geo.area"), "Point": function(area) { assert.equal(area({type: "Point", coordinates: [0, 0]}), 0); }, "MultiPoint": function(area) { assert.equal(area({type: "MultiPoint", coordinates: [[0, 1], [2, 3]]}), 0); }, "LineString": function(area) { assert.equal(area({type: "LineString", coordinates: [[0, 1], [2, 3]]}), 0); }, "MultiLineString": function(area) { assert.equal(area({type: "MultiLineString", coordinates: [[[0, 1], [2, 3]], [[4, 5], [6, 7]]]}), 0); }, "Polygon": { "tiny": function(area) { assert.inDelta(area({type: "Polygon", coordinates: [[ [-64.66070178517852, 18.33986913231323], [-64.66079715091509, 18.33994007490749], [-64.66074946804680, 18.33994007490749], [-64.66070178517852, 18.33986913231323] ]]}), 4.890516e-13, 1e-13); }, "zero area": function(area) { assert.equal(area({ "type": "Polygon", "coordinates": [[ [96.79142432523281, 5.262704519048153], [96.81065389253769, 5.272455576551362], [96.82988345984256, 5.272455576551362], [96.81065389253769, 5.272455576551362], [96.79142432523281, 5.262704519048153] ]] }), 0); }, "semilune": function(area) { assert.inDelta(area({type: "Polygon", coordinates: [[[0, 0], [0, 90], [90, 0], [0, 0]]]}), π / 2, 1e-6); }, "lune": function(area) { assert.equal(area({type: "Polygon", coordinates: [[[0, 0], [0, 90], [90, 0], [0, -90], [0, 0]]]}), π); }, "hemispheres": { "North": function(area) { assert.inDelta(area({type: "Polygon", coordinates: [[[0, 0], [-90, 0], [180, 0], [90, 0], [0, 0]]]}), 2 * π, 1e-6); }, "South": function(area) { assert.inDelta(area({type: "Polygon", coordinates: [[[0, 0], [90, 0], [180, 0], [-90, 0], [0, 0]]]}), 2 * π, 1e-6); }, "East": function(area) { assert.equal(area({type: "Polygon", coordinates: [[[0, 0], [0, 90], [180, 0], [0, -90], [0, 0]]]}), 2 * π); }, "West": function(area) { assert.equal(area({type: "Polygon", coordinates: [[[0, 0], [0, -90], [180, 0], [0, 90], [0, 0]]]}), 2 * π); } }, "graticule outline": { "sphere": function(area) { assert.inDelta(area(_.geo.graticule().extent([[-180, -90], [180, 90]]).outline()), 4 * π, 1e-5); }, "hemisphere": function(area) { assert.inDelta(area(_.geo.graticule().extent([[-180, 0], [180, 90]]).outline()), 2 * π, 1e-5); }, "semilune": function(area) { assert.inDelta(area(_.geo.graticule().extent([[0, 0], [90, 90]]).outline()), π / 2, 1e-5); } }, "circles": { "hemisphere": function(area) { assert.inDelta(area(_.geo.circle().angle(90)()), 2 * π, 1e-5); }, "60°": function(area) { assert.inDelta(area(_.geo.circle().angle(60).precision(.1)()), π, 1e-5); }, "60° North": function(area) { assert.inDelta(area(_.geo.circle().angle(60).precision(.1).origin([0, 90])()), π, 1e-5); }, "45°": function(area) { assert.inDelta(area(_.geo.circle().angle(45).precision(.1)()), π * (2 - Math.SQRT2), 1e-5); }, "45° North": function(area) { assert.inDelta(area(_.geo.circle().angle(45).precision(.1).origin([0, 90])()), π * (2 - Math.SQRT2), 1e-5); }, "45° South": function(area) { assert.inDelta(area(_.geo.circle().angle(45).precision(.1).origin([0, -90])()), π * (2 - Math.SQRT2), 1e-5); }, "135°": function(area) { assert.inDelta(area(_.geo.circle().angle(135).precision(.1)()), π * (2 + Math.SQRT2), 1e-5); }, "135° North": function(area) { assert.inDelta(area(_.geo.circle().angle(135).precision(.1).origin([0, 90])()), π * (2 + Math.SQRT2), 1e-5); }, "135° South": function(area) { assert.inDelta(area(_.geo.circle().angle(135).precision(.1).origin([0, -90])()), π * (2 + Math.SQRT2), 1e-5); }, "tiny": function(area) { assert.inDelta(area(_.geo.circle().angle(1e-6).precision(.1)()), 0, 1e-6); }, "huge": function(area) { assert.inDelta(area(_.geo.circle().angle(180 - 1e-6).precision(.1)()), 4 * π, 1e-6); }, "60° with 45° hole": function(area) { var circle = _.geo.circle().precision(.1); assert.inDelta(area({ type: "Polygon", coordinates: [ circle.angle(60)().coordinates[0], circle.angle(45)().coordinates[0].reverse() ] }), π * (Math.SQRT2 - 1), 1e-5); }, "45° holes at [0°, 0°] and [0°, 90°]": function(area) { var circle = _.geo.circle().precision(.1).angle(45); assert.inDelta(area({ type: "Polygon", coordinates: [ circle.origin([0, 0])().coordinates[0].reverse(), circle.origin([0, 90])().coordinates[0].reverse() ] }), π * 2 * Math.SQRT2, 1e-5); }, "45° holes at [0°, 90°] and [0°, 0°]": function(area) { var circle = _.geo.circle().precision(.1).angle(45); assert.inDelta(area({ type: "Polygon", coordinates: [ circle.origin([0, 90])().coordinates[0].reverse(), circle.origin([0, 0])().coordinates[0].reverse() ] }), π * 2 * Math.SQRT2, 1e-5); } }, "stripes": { "45°, -45°": function(area) { assert.inDelta(area(stripes(45, -45)), π * 2 * Math.SQRT2, 1e-5); }, "-45°, 45°": function(area) { assert.inDelta(area(stripes(-45, 45)), π * 2 * (2 - Math.SQRT2), 1e-5); }, "45°, 30°": function(area) { assert.inDelta(area(stripes(45, 30)), π * (Math.SQRT2 - 1), 1e-5); } } }, "MultiPolygon": { "two hemispheres": function(area) { assert.equal(area({type: "MultiPolygon", coordinates: [ [[[0, 0], [-90, 0], [180, 0], [90, 0], [0, 0]]], [[[0, 0], [90, 0], [180, 0], [-90, 0], [0, 0]]] ]}), 4 * π); } }, "Sphere": function(area) { assert.equal(area({type: "Sphere"}), 4 * π); }, "GeometryCollection": function(area) { assert.equal(area({type: "GeometryCollection", geometries: [{type: "Sphere"}]}), 4 * π); }, "FeatureCollection": function(area) { assert.equal(area({type: "FeatureCollection", features: [{type: "Feature", geometry: {type: "Sphere"}}]}), 4 * π); }, "Feature": function(area) { assert.equal(area({type: "Feature", geometry: {type: "Sphere"}}), 4 * π); } }
});
suite.export(module);
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; })};
}