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70 lines
2.2 KiB
70 lines
2.2 KiB
1 year ago
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function streamGeometry(geometry, stream) {
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if (geometry && streamGeometryType.hasOwnProperty(geometry.type)) {
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streamGeometryType[geometry.type](geometry, stream);
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}
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}
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var streamObjectType = {
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Feature: function(object, stream) {
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streamGeometry(object.geometry, stream);
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},
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FeatureCollection: function(object, stream) {
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var features = object.features, i = -1, n = features.length;
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while (++i < n) streamGeometry(features[i].geometry, stream);
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}
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};
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var streamGeometryType = {
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Sphere: function(object, stream) {
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stream.sphere();
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},
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Point: function(object, stream) {
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object = object.coordinates;
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stream.point(object[0], object[1], object[2]);
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},
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MultiPoint: function(object, stream) {
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var coordinates = object.coordinates, i = -1, n = coordinates.length;
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while (++i < n) object = coordinates[i], stream.point(object[0], object[1], object[2]);
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},
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LineString: function(object, stream) {
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streamLine(object.coordinates, stream, 0);
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},
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MultiLineString: function(object, stream) {
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var coordinates = object.coordinates, i = -1, n = coordinates.length;
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while (++i < n) streamLine(coordinates[i], stream, 0);
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},
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Polygon: function(object, stream) {
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streamPolygon(object.coordinates, stream);
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},
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MultiPolygon: function(object, stream) {
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var coordinates = object.coordinates, i = -1, n = coordinates.length;
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while (++i < n) streamPolygon(coordinates[i], stream);
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},
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GeometryCollection: function(object, stream) {
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var geometries = object.geometries, i = -1, n = geometries.length;
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while (++i < n) streamGeometry(geometries[i], stream);
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}
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};
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function streamLine(coordinates, stream, closed) {
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var i = -1, n = coordinates.length - closed, coordinate;
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stream.lineStart();
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while (++i < n) coordinate = coordinates[i], stream.point(coordinate[0], coordinate[1], coordinate[2]);
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stream.lineEnd();
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}
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function streamPolygon(coordinates, stream) {
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var i = -1, n = coordinates.length;
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stream.polygonStart();
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while (++i < n) streamLine(coordinates[i], stream, 1);
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stream.polygonEnd();
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}
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export default function(object, stream) {
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if (object && streamObjectType.hasOwnProperty(object.type)) {
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streamObjectType[object.type](object, stream);
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} else {
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streamGeometry(object, stream);
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}
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}
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