s2-tools
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A collection of geospatial tools primarily designed for WGS84, Web Mercator, and S2.
46 lines • 2.38 kB
JavaScript
/**
* Describes the physical path that a vehicle takes when it's not part of the (CSV) GTFS,
* such as for a detour. Shapes belong to Trips, and consist of a sequence of shape points.
* Tracing the points in order provides the path of the vehicle. Shapes do not need to intercept
* the location of Stops exactly, but all Stops on a trip should lie within a small distance of
* the shape for that trip, i.e. close to straight line segments connecting the shape points
* NOTE: This message is still experimental, and subject to change. It may be formally adopted in the future.
*/
export class GTFSRealtimeShape {
/**
* Identifier of the shape. Must be different than any shape_id defined in the (CSV) GTFS.
* This field is required as per reference.md, but needs to be specified here optional because "Required is Forever"
* See https://developers.google.com/protocol-buffers/docs/proto#specifying_field_rules
* NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future.
*/
shapeId; // 1 [string]
/**
* Encoded polyline representation of the shape. This polyline must contain at least two points.
* For more information about encoded polylines, see https://developers.google.com/maps/documentation/utilities/polylinealgorithm
* This field is required as per reference.md, but needs to be specified here optional because "Required is Forever"
* See https://developers.google.com/protocol-buffers/docs/proto#specifying_field_rules
* NOTE: This field is still experimental, and subject to change. It may be formally adopted in the future.
*/
encodedPolyline; // 2 [string]
/**
* @param pbf - The Protobuf object to read from
* @param end - The end position of the message in the buffer
*/
constructor(pbf, end) {
pbf.readFields(this.#readShape, this, end);
}
/**
* @param tag - The tag of the message
* @param shape - The shape to mutate
* @param pbf - The Protobuf object to read from
*/
#readShape(tag, shape, pbf) {
if (tag === 1)
shape.shapeId = pbf.readString();
else if (tag === 2)
shape.encodedPolyline = pbf.readString();
else
throw new Error(`GTFSRealtimeShape: Unexpected tag: ${tag}`);
}
}
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