package mapnik.vector

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View/edit binary Protocol Buffers messages

• repeated tile.layer layers = 3

Used in: feature

• Unknown = 0

• Point = 1

• LineString = 2

• Polygon = 3

Used in: layer

• optional uint64 id = 1

• repeated uint32 tags = 2

  Tags of this feature. Even numbered values refer to the nth value in the keys list on the tile message, odd numbered values refer to the nth value in the values list on the tile message.

• optional GeomType type = 3

  The type of geometry stored in this feature.

• repeated uint32 geometry = 4

  Contains a stream of commands and parameters (vertices). The repeat count is shifted to the left by 3 bits. This means that the command has 3 bits (0-7). The repeat count indicates how often this command is to be repeated. Defined commands are: - MoveTo: 1 (2 parameters follow) - LineTo: 2 (2 parameters follow) - ClosePath: 7 (no parameters follow) Ex.: MoveTo(3, 6), LineTo(8, 12), LineTo(20, 34), ClosePath Encoded as: [ 9 3 6 18 5 6 12 22 7 ] == command type 7 (ClosePath) ===== relative LineTo(+12, +22) == LineTo(20, 34) === relative LineTo(+5, +6) == LineTo(8, 12) == [00010 010] = command type 2 (LineTo), length 2 === relative MoveTo(+3, +6) == [00001 001] = command type 1 (MoveTo), length 1 Commands are encoded as uint32 varints, vertex parameters are encoded as sint32 varints (zigzag). Vertex parameters are also encoded as deltas to the previous position. The original position is (0,0)

Used in: tile

• required uint32 version = 15

  Any compliant implementation must first read the version number encoded in this message and choose the correct implementation for this version number before proceeding to decode other parts of this message.

• required string name = 1

• repeated feature features = 2

  The actual features in this tile.

• repeated string keys = 3

  Dictionary encoding for keys

• repeated value values = 4

  Dictionary encoding for values

• optional uint32 extent = 5

  The bounding box in this tile spans from 0..4095 units

Variant type encoding

Used in: layer

• optional string string_value = 1

  Exactly one of these values may be present in a valid message

• optional float float_value = 2

• optional double double_value = 3

• optional int64 int_value = 4

• optional uint64 uint_value = 5

• optional sint64 sint_value = 6

• optional bool bool_value = 7