Created
December 11, 2012 17:59
GeoJSON Transforms
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| function d3_geo_type(types) { | |
| for (var type in d3_geo_typeDefaults) { | |
| if (!(type in types)) { | |
| types[type] = d3_geo_typeDefaults[type]; | |
| } | |
| } | |
| return types; | |
| } | |
| var d3_geo_typeDefaults = { | |
| Feature: function(o) { | |
| var g = this.geometry(o.geometry); | |
| return g && (o = Object.create(o), o.geometry = g); | |
| }, | |
| FeatureCollection: function(o) { | |
| var a = [], f, features = o.features, i = -1, n = features.length; | |
| while (++i < n) if (f = this.Feature(features[i])) a.push(f); | |
| return a.length ? (o = Object.create(o), o.features = a) : null; | |
| }, | |
| GeometryCollection: function(o) { | |
| var a = [], g, geometries = o.geometries, i = -1, n = geometries.length; | |
| while (++i < n) if (g = this.geometry(geometries[i])) a.push(g); | |
| return a.length ? (o = Object.create(o), o.geometries = a) : null; | |
| }, | |
| LineString: function(o) { | |
| var c = this.line(o.coordinates); | |
| return c && (o = Object.create(o), o.coordinates = c); | |
| }, | |
| MultiLineString: function(o) { | |
| var a = [], c, coordinates = o.coordinates, i = -1, n = coordinates.length; | |
| while (++i < n) if(c = this.line(coordinates[i])) a.push(c); | |
| return a.length ? (o = Object.create(o), o.coordinates = a) : null; | |
| }, | |
| MultiPoint: function(o) { | |
| var a = [], c, coordinates = o.coordinates, i = -1, n = coordinates.length; | |
| while (++i < n) if(c = this.point(coordinates[i])) a.push(c); | |
| return a.length ? (o = Object.create(o), o.coordinates = a) : null; | |
| }, | |
| MultiPolygon: function(multiPolygon) { | |
| var a = [], c, coordinates = o.coordinates, i = -1, n = coordinates.length; | |
| while (++i < n) if(c = this.polygon(coordinates[i])) a.push(c); | |
| return a.length ? (o = Object.create(o), o.coordinates = a) : null; | |
| }, | |
| Point: function(point) { | |
| var c = this.point(o.coordinates); | |
| return c && (o = Object.create(o), o.coordinates = c); | |
| }, | |
| Polygon: function(polygon) { | |
| var c = this.polygon(o.coordinates); | |
| return c && (o = Object.create(o), o.coordinates = c); | |
| }, | |
| Sphere: d3_noop, | |
| object: function(object) { | |
| return d3_geo_typeObjects.hasOwnProperty(object.type) | |
| ? this[object.type](object) | |
| : this.geometry(object); | |
| }, | |
| geometry: function(geometry) { | |
| return d3_geo_typeGeometries.hasOwnProperty(geometry.type) | |
| ? this[geometry.type](geometry) | |
| : null; | |
| }, | |
| point: d3_noop, | |
| line: function(coordinates) { | |
| var a = [], c, i = -1, n = coordinates.length; | |
| while (++i < n) if(c = this.point(coordinates[i])) a.push(c); | |
| return a.length ? a : null; | |
| }, | |
| polygon: function(coordinates) { | |
| var a = [], c, i = -1, n = coordinates.length; | |
| while (++i < n) if(c = this.line(coordinates[i])) a.push(c); | |
| return a.length ? a : null; | |
| } | |
| }; | |
| var d3_geo_typeGeometries = { | |
| LineString: 1, | |
| MultiLineString: 1, | |
| MultiPoint: 1, | |
| MultiPolygon: 1, | |
| Point: 1, | |
| Polygon: 1, | |
| Sphere: 1 | |
| }; | |
| var d3_geo_typeObjects = { | |
| Feature: 1, | |
| FeatureCollection: 1, | |
| GeometryCollection: 1 | |
| }; |
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