PbfParser::Geometry PbfParser::getGeometry(ParserContext& _ctx, protobuf::message _geomIn) {
Geometry geometry;
pbfGeomCmd cmd = pbfGeomCmd::moveTo;
uint32_t cmdRepeat = 0;
double invTileExtent = (1.0/(_ctx.tileExtent-1.0));
int64_t x = 0;
int64_t y = 0;
size_t numCoordinates = 0;
while(_geomIn.getData() < _geomIn.getEnd()) {
if(cmdRepeat == 0) { // get new command, length and parameters..
uint32_t cmdData = static_cast<uint32_t>(_geomIn.varint());
cmd = static_cast<pbfGeomCmd>(cmdData & 0x7); //first 3 bits of the cmdData
cmdRepeat = cmdData >> 3; //last 5 bits
}
if(cmd == pbfGeomCmd::moveTo || cmd == pbfGeomCmd::lineTo) { // get parameters/points
// if cmd is move then move to a new line/set of points and save this line
if(cmd == pbfGeomCmd::moveTo) {
if (geometry.coordinates.size() > 0) {
geometry.sizes.push_back(numCoordinates);
}
numCoordinates = 0;
}
x += _geomIn.svarint();
y += _geomIn.svarint();
// bring the points in 0 to 1 space
Point p;
p.x = invTileExtent * (double)x;
p.y = invTileExtent * (double)(_ctx.tileExtent - y);
if (numCoordinates == 0 || geometry.coordinates.back() != p) {
geometry.coordinates.push_back(p);
numCoordinates++;
}
} else if(cmd == pbfGeomCmd::closePath) {
// end of a polygon, push first point in this line as last and push line to poly
geometry.coordinates.push_back(geometry.coordinates[geometry.coordinates.size() - numCoordinates]);
geometry.sizes.push_back(numCoordinates + 1);
numCoordinates = 0;
}
cmdRepeat--;
}
void PbfParser::extractGeometry(protobuf::message& _geomIn, int _tileExtent, std::vector<Line>& _out, const MapTile& _tile) {
pbfGeomCmd cmd = pbfGeomCmd::moveTo;
uint32_t cmdRepeat = 0;
double invTileExtent = (1.0/(double)_tileExtent);
Line line;
int64_t x = 0;
int64_t y = 0;
while(_geomIn.getData() < _geomIn.getEnd()) {
if(cmdRepeat == 0) { // get new command, lengh and parameters..
uint32_t cmdData = static_cast<uint32_t>(_geomIn.varint());
cmd = static_cast<pbfGeomCmd>(cmdData & 0x7); //first 3 bits of the cmdData
cmdRepeat = cmdData >> 3; //last 5 bits
}
if(cmd == pbfGeomCmd::moveTo || cmd == pbfGeomCmd::lineTo) { // get parameters/points
// if cmd is move then move to a new line/set of points and save this line
if(cmd == pbfGeomCmd::moveTo) {
if(line.size() > 0) {
_out.push_back(line);
}
line.clear();
}
x += _geomIn.svarint();
y += _geomIn.svarint();
// bring the points in -1 to 1 space
Point p;
p.x = invTileExtent * (double)(2 * x - _tileExtent);
p.y = invTileExtent * (double)(_tileExtent - 2 * y);
line.push_back(p);
} else if( cmd == pbfGeomCmd::closePath) { // end of a polygon, push first point in this line as last and push line to poly
line.push_back(line[0]);
_out.push_back(line);
line.clear();
}
cmdRepeat--;
}
