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Include edge duration information.

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This commit is contained in:
Daniel Patterson 2016-03-18 13:57:36 -07:00 committed by Patrick Niklaus
parent 879ccfc8c2
commit 4e8ccd6f7d
1 changed files with 89 additions and 21 deletions
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110
src/engine/plugins/tile.cpp
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@ -69,7 +69,7 @@ using FloatLine = std::vector<detail::Point<double>>;
// from mapnik-vector-tile
// Encodes a linestring using protobuf zigzag encoding
inline bool encodeLinestring(const FixedLine& line,
inline bool encodeLinestring(const FixedLine &line,
protozero::packed_field_uint32 &geometry,
std::int32_t &start_x,
std::int32_t &start_y)
@ -145,6 +145,64 @@ Status TilePlugin::HandleRequest(const api::TileParameters &parameters, std::str
// This hits the OSRM StaticRTree
const auto edges = facade.GetEdgesInBox(southwest, northeast);
std::vector<int> used_weights;
std::unordered_map<int, std::size_t> weight_offsets;
uint8_t max_datasource_id = 0;
// Loop over all edges once to tally up all the attributes we'll need.
// We need to do this so that we know the attribute offsets to use
// when we encode each feature in the tile.
for (const auto &edge : edges)
{
int forward_weight = 0, reverse_weight = 0;
uint8_t forward_datasource = 0;
uint8_t reverse_datasource = 0;
if (edge.forward_packed_geometry_id != SPECIAL_EDGEID)
{
std::vector<EdgeWeight> forward_weight_vector;
facade.GetUncompressedWeights(edge.forward_packed_geometry_id, forward_weight_vector);
forward_weight = forward_weight_vector[edge.fwd_segment_position];
std::vector<uint8_t> forward_datasource_vector;
facade.GetUncompressedDatasources(edge.forward_packed_geometry_id,
forward_datasource_vector);
forward_datasource = forward_datasource_vector[edge.fwd_segment_position];
if (weight_offsets.find(forward_weight) == weight_offsets.end())
{
used_weights.push_back(forward_weight);
weight_offsets[forward_weight] = used_weights.size() - 1;
}
}
if (edge.reverse_packed_geometry_id != SPECIAL_EDGEID)
{
std::vector<EdgeWeight> reverse_weight_vector;
facade.GetUncompressedWeights(edge.reverse_packed_geometry_id, reverse_weight_vector);
BOOST_ASSERT(edge.fwd_segment_position < reverse_weight_vector.size());
reverse_weight =
reverse_weight_vector[reverse_weight_vector.size() - edge.fwd_segment_position - 1];
if (weight_offsets.find(reverse_weight) == weight_offsets.end())
{
used_weights.push_back(reverse_weight);
weight_offsets[reverse_weight] = used_weights.size() - 1;
}
std::vector<uint8_t> reverse_datasource_vector;
facade.GetUncompressedDatasources(edge.reverse_packed_geometry_id,
reverse_datasource_vector);
reverse_datasource = reverse_datasource_vector[reverse_datasource_vector.size() -
edge.fwd_segment_position - 1];
}
// Keep track of the highest datasource seen so that we don't write unnecessary
// data to the layer attribute values
max_datasource_id = std::max(max_datasource_id, forward_datasource);
max_datasource_id = std::max(max_datasource_id, reverse_datasource);
}
// TODO: extract speed values for compressed and uncompressed geometries
// Convert tile coordinates into mercator coordinates
@ -152,8 +210,6 @@ Status TilePlugin::HandleRequest(const api::TileParameters &parameters, std::str
max_lat);
const detail::BBox tile_bbox{min_lon, min_lat, max_lon, max_lat};
uint8_t max_datasource_id = 0;
// Protobuf serialized blocks when objects go out of scope, hence
// the extra scoping below.
protozero::pbf_writer tile_writer{pbf_buffer};
@ -224,8 +280,9 @@ Status TilePlugin::HandleRequest(const api::TileParameters &parameters, std::str
max_datasource_id = std::max(max_datasource_id, forward_datasource);
max_datasource_id = std::max(max_datasource_id, reverse_datasource);
const auto encode_tile_line = [&layer_writer, &edge, &id](
const detail::FixedLine &tile_line, const std::uint32_t speed_kmh, const std::uint8_t datasource,
const auto encode_tile_line = [&layer_writer, &edge, &id, &max_datasource_id](
const detail::FixedLine &tile_line, const std::uint32_t speed_kmh,
const std::size_t duration, const std::uint8_t datasource,
std::int32_t &start_x, std::int32_t &start_y)
{
// Here, we save the two attributes for our feature: the speed and the
@ -250,11 +307,14 @@ Status TilePlugin::HandleRequest(const api::TileParameters &parameters, std::str
field.add_element(0); // "speed" tag key offset
field.add_element(
std::min(speed_kmh, 127u)); // save the speed value, capped at 127
field.add_element(1); // "is_small" tag key offset
field.add_element(1); // "is_small" tag key offset
field.add_element(128 +
(edge.component.is_tiny ? 0 : 1)); // is_small feature
field.add_element(2); // "datasource" tag key offset
field.add_element(2); // "datasource" tag key offset
field.add_element(130 + datasource); // datasource value offset
field.add_element(3); // "duration" tag key offset
field.add_element(130 + max_datasource_id + 1 +
duration); // duration value offset
}
{
// Encode the geometry for the feature
@ -274,7 +334,8 @@ Status TilePlugin::HandleRequest(const api::TileParameters &parameters, std::str
static_cast<std::uint32_t>(round(length / forward_weight * 10 * 3.6));
auto tile_line = coordinatesToTileLine(a, b, tile_bbox);
encode_tile_line(tile_line, speed_kmh, forward_datasource, start_x, start_y);
encode_tile_line(tile_line, speed_kmh, weight_offsets[forward_weight],
forward_datasource, start_x, start_y);
}
// Repeat the above for the coordinates reversed and using the `reverse`
@ -289,7 +350,8 @@ Status TilePlugin::HandleRequest(const api::TileParameters &parameters, std::str
static_cast<std::uint32_t>(round(length / reverse_weight * 10 * 3.6));
auto tile_line = coordinatesToTileLine(b, a, tile_bbox);
encode_tile_line(tile_line, speed_kmh, reverse_datasource, start_x, start_y);
encode_tile_line(tile_line, speed_kmh, weight_offsets[reverse_weight],
reverse_datasource, start_x, start_y);
}
}
}
@ -300,18 +362,17 @@ Status TilePlugin::HandleRequest(const api::TileParameters &parameters, std::str
layer_writer.add_string(3, "speed");
layer_writer.add_string(3, "is_small");
layer_writer.add_string(3, "datasource");
layer_writer.add_string(3, "duration");
// Now, we write out the possible speed value arrays and possible is_tiny
// values. Field type 4 is the "values" field. It's a variable type field,
// so requires a two-step write (create the field, then write its value)
for (std::size_t i = 0; i < 128; i++)
{
{
// Writing field type 4 == variant type
protozero::pbf_writer values_writer(layer_writer, 4);
// Attribute value 5 == uin64 type
values_writer.add_uint64(5, i);
}
// Writing field type 4 == variant type
protozero::pbf_writer values_writer(layer_writer, 4);
// Attribute value 5 == uin64 type
values_writer.add_uint64(5, i);
}
{
protozero::pbf_writer values_writer(layer_writer, 4);
@ -325,12 +386,19 @@ Status TilePlugin::HandleRequest(const api::TileParameters &parameters, std::str
}
for (std::size_t i = 0; i <= max_datasource_id; i++)
{
{
// Writing field type 4 == variant type
protozero::pbf_writer values_writer(layer_writer, 4);
// Attribute value 1 == string type
values_writer.add_string(1, facade.GetDatasourceName(i));
}
// Writing field type 4 == variant type
protozero::pbf_writer values_writer(layer_writer, 4);
// Attribute value 1 == string type
values_writer.add_string(1, facade.GetDatasourceName(i));
}
for (auto weight : used_weights)
{
// Writing field type 4 == variant type
protozero::pbf_writer values_writer(layer_writer, 4);
// Attribute value 2 == float type
// Durations come out of OSRM in integer deciseconds, so we convert them
// to seconds with a simple /10 for display
values_writer.add_double(3, weight / 10.);
}
}