func readNodes(
nodes []*osmpbf.Node,
block *osmpbf.PrimitiveBlock,
stringtable stringTable) ([]element.Node, []element.Node) {
coords := make([]element.Node, len(nodes))
nds := make([]element.Node, 0, len(nodes)/8)
granularity := int64(block.GetGranularity())
latOffset := block.GetLatOffset()
lonOffset := block.GetLonOffset()
coordScale := 0.000000001
for i := range nodes {
id := *nodes[i].Id
lon := *nodes[i].Lon
lat := *nodes[i].Lat
coords[i].Id = id
coords[i].Long = (coordScale * float64(lonOffset+(granularity*lon)))
coords[i].Lat = (coordScale * float64(latOffset+(granularity*lat)))
if stringtable != nil {
tags := parseTags(stringtable, nodes[i].Keys, nodes[i].Vals)
if tags != nil {
if _, ok := tags["created_by"]; ok && len(tags) == 1 {
// don't add nodes with only created_by tag to nodes cache
} else {
nd := coords[i]
nd.Tags = tags
nds = append(nds, nd)
}
}
}
}
return coords, nds
}
func readDenseNodes(
dense *osmpbf.DenseNodes,
block *osmpbf.PrimitiveBlock,
stringtable stringTable) (coords []element.Node, nodes []element.Node) {
var lastId int64
var lastLon, lastLat int64
coords = make([]element.Node, len(dense.Id))
nodes = make([]element.Node, 0, len(dense.Id)/8)
granularity := int64(block.GetGranularity())
latOffset := block.GetLatOffset()
lonOffset := block.GetLonOffset()
coordScale := 0.000000001
lastKeyValPos := 0
for i := range coords {
lastId += dense.Id[i]
lastLon += dense.Lon[i]
lastLat += dense.Lat[i]
coords[i].Id = lastId
coords[i].Long = (coordScale * float64(lonOffset+(granularity*lastLon)))
coords[i].Lat = (coordScale * float64(latOffset+(granularity*lastLat)))
if stringtable != nil && len(dense.KeysVals) > 0 {
if dense.KeysVals[lastKeyValPos] != 0 {
tags := parseDenseNodeTags(stringtable, &dense.KeysVals, &lastKeyValPos)
if tags != nil {
if _, ok := tags["created_by"]; ok && len(tags) == 1 {
// don't add nodes with only created_by tag to nodes cache
} else {
nd := coords[i]
nd.Tags = tags
nodes = append(nodes, nd)
}
}
} else {
lastKeyValPos += 1
}
}
}
return coords, nodes
}