45 строки
2.4 KiB
JavaScript
45 строки
2.4 KiB
JavaScript
var vows = require("vows"),
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load = require("../load"),
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assert = require("assert");
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var suite = vows.describe("d3.geo.length");
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var π = Math.PI;
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suite.addBatch({
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"length": {
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topic: load("geo/length").expression("d3.geo.length"),
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"the length of points are zero": function(length) {
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assert.inDelta(length({type: "Point", coordinates: [0, 0]}), 0, 1e-6);
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assert.inDelta(length({type: "MultiPoint", coordinates: [[0, 1], [2, 3]]}), 0, 1e-6);
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},
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"the length of a line string is the sum of its great arc segments": function(length) {
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assert.inDelta(length({type: "LineString", coordinates: [[-45, 0], [45, 0]]}), Math.PI / 2, 1e-6);
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assert.inDelta(length({type: "LineString", coordinates: [[-45, 0], [-30, 0], [-15, 0], [0, 0]]}), Math.PI / 4, 1e-6);
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assert.inDelta(length({type: "MultiLineString", coordinates: [[[-45, 0], [-30, 0]], [[-15, 0], [0, 0]]]}), Math.PI / 6, 1e-6);
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},
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"the length of a polygon is its perimeter": function(length) {
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assert.inDelta(length({type: "Polygon", coordinates: [[[0, 0], [3, 0], [3, 3], [0, 3], [0, 0]]]}), 0.157008, 1e-6);
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assert.inDelta(length({type: "MultiPolygon", coordinates: [[[[0, 0], [3, 0], [3, 3], [0, 3], [0, 0]]]]}), 0.157008, 1e-6);
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assert.inDelta(length({type: "MultiPolygon", coordinates: [[[[0, 0], [3, 0], [3, 3], [0, 3], [0, 0]]], [[[1, 1], [2, 1], [2, 2], [1, 2], [1, 1]]]]}), 0.209354, 1e-6);
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},
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"the length of a polygon is its perimeter, including holes": function(length) {
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assert.inDelta(length({type: "Polygon", coordinates: [[[0, 0], [3, 0], [3, 3], [0, 3], [0, 0]], [[1, 1], [2, 1], [2, 2], [1, 2], [1, 1]]]}), 0.209354, 1e-6);
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},
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"the length of a feature collection is the sum of its features": function(length) {
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assert.inDelta(length({type: "FeatureCollection", features: [
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{type: "Feature", geometry: {type: "LineString", coordinates: [[-45, 0], [0, 0]]}},
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{type: "Feature", geometry: {type: "LineString", coordinates: [[0, 0], [45, 0]]}}
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]}), Math.PI / 2, 1e-6);
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},
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"the length of a geometry collection is the sum of its geometries": function(length) {
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assert.inDelta(length({type: "GeometryCollection", geometries: [
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{type: "GeometryCollection", geometries: [{type: "LineString", coordinates: [[-45, 0], [0, 0]]}]},
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{type: "LineString", coordinates: [[0, 0], [45, 0]]}
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]}), Math.PI / 2, 1e-6);
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}
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}
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});
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suite.export(module);
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