// move all points of w, use the node with id as reference to do a relative move
func (w *Way) MoveTo(id int64, p *point.Point) error {
ref := w.Nodes_[id]
if ref == nil {
return errors.New(fmt.Sprintf("Node #%d not part of Way #%d\n", id, w.Id()))
}
return w.RMoveTo(point.New(ref.Position().Lat-p.Lat, ref.Position().Lon-p.Lon))
}
// Weighted centroid of all area parts
//
// NOTE - when a relation has node members outside of the way members, this will
// probably result in a wrong point (bounding box is taken from all nodes,
// not just way nodes)
func (r *Relation) Centroid() (p *point.Point, err error) {
if !r.IsAreaRelation() {
err = errors.New("Not an area relation")
return
}
var seen []*way.Way
var bb *bbox.BBox
var lat float64
var lon float64
var den float64
wayList, err := r.WayMembersAsWays()
if err != nil {
return
}
bb, err = r.BoundingBox()
if err != nil {
return
}
for _, w := range wayList {
c := w.Centroid()
if c == nil {
err = errors.New(fmt.Sprintf("Way #%d has no centroid?!", w.Id()))
return
}
a := w.Area()
if a == -1.0 {
err = errors.New(fmt.Sprintf("Way #%d has no area", w.Id()))
return
}
count := 0
for _, s := range seen {
if s.Contains(w.Nodes_[0]) {
count += 1
}
}
seen = append(seen, w)
neg := 1.0
if count%2 == 1 {
neg = -1.0
}
lon += a * neg * (c.Lon - bb.LowerLeft.Lon)
lat += a * neg * (c.Lat - bb.LowerLeft.Lat)
den += a * neg
}
return point.New(bb.LowerLeft.Lat+lat/den, bb.LowerLeft.Lon+lon/den), nil
}
func (nl NodeList) BoundingBox() (bb *bbox.BBox, err error) {
if nl == nil {
err = errors.New("Empty Nodelist")
return
}
n := []*Node(nl)
llat := n[0].Position_.Lat
ulat := n[0].Position_.Lat
llon := n[0].Position_.Lon
ulon := n[0].Position_.Lon
l := len(n)
for i := 1; i < l; i++ {
llat = math.Min(llat, n[i].Position_.Lat)
ulat = math.Max(ulat, n[i].Position_.Lat)
llon = math.Min(llon, n[i].Position_.Lon)
ulon = math.Max(ulon, n[i].Position_.Lon)
}
return &bbox.BBox{
LowerLeft: point.New(llat, llon),
UpperRight: point.New(ulat, ulon),
}, nil
}
func (w *Way) Centroid() *point.Point {
if !w.Closed() {
return nil
}
var cx, cy, a float64
l := len(w.Nodes_) - 1
for i := 0; i < l; i++ {
ap := w.Nodes_[i].Position_.Lon*w.Nodes_[i+1].Position_.Lat - w.Nodes_[i+1].Position_.Lon*w.Nodes_[i].Position_.Lat
cx += (w.Nodes_[i].Position_.Lon + w.Nodes_[i+1].Position_.Lon) * ap
cy += (w.Nodes_[i].Position_.Lat + w.Nodes_[i+1].Position_.Lat) * ap
a += ap
}
cx = 2 * cx / (6 * a)
cy = 2 * cy / (6 * a)
return point.New(cy, cx)
}
// implements the osm.Parser interface
func (p *Pbf) Parse() (o *osm.OSM, err error) {
d := osmpbf.NewDecoder(p.r)
err = d.Start(runtime.GOMAXPROCS(-1))
if err != nil {
return
}
o = osm.NewOSM()
var v interface{}
for {
if v, err = d.Decode(); err == io.EOF {
err = nil
break
} else if err != nil {
return
} else {
switch v := v.(type) {
case *osmpbf.Node:
var t tags.Tags
if v.Tags != nil && len(v.Tags) != 0 {
t = tags.Tags(v.Tags)
}
o.Nodes[v.ID] = &node.Node{
Id_: v.ID,
User_: user.New(int64(v.Info.Uid), v.Info.User),
Position_: point.New(v.Lat, v.Lon),
Timestamp_: v.Info.Timestamp,
Changeset_: v.Info.Changeset,
Version_: int64(v.Info.Version),
Visible_: v.Info.Visible,
Tags_: &t,
}
case *osmpbf.Way:
var t tags.Tags
if v.Tags != nil && len(v.Tags) != 0 {
t = tags.Tags(v.Tags)
}
w := &way.Way{
Id_: v.ID,
User_: user.New(int64(v.Info.Uid), v.Info.User),
Timestamp_: v.Info.Timestamp,
Changeset_: v.Info.Changeset,
Version_: int64(v.Info.Version),
Visible_: v.Info.Visible,
Tags_: &t,
}
var nd []*node.Node
for _, id := range v.NodeIDs {
n := o.Nodes[id]
if n == nil {
err = errors.New(fmt.Sprintf("Missing node #%d in way #%d", id, v.ID))
o = nil
return
}
nd = append(nd, n)
}
w.Nodes_ = nd
o.Ways[v.ID] = w
case *osmpbf.Relation:
var t tags.Tags
if v.Tags != nil && len(v.Tags) != 0 {
t = tags.Tags(v.Tags)
}
r := &relation.Relation{
Id_: v.ID,
User_: user.New(int64(v.Info.Uid), v.Info.User),
Timestamp_: v.Info.Timestamp,
Changeset_: v.Info.Changeset,
Version_: int64(v.Info.Version),
Visible_: v.Info.Visible,
Tags_: &t,
}
var members []*relation.Member
for _, m := range v.Members {
member := &relation.Member{Role: m.Role, Id_: m.ID}
switch m.Type {
case osmpbf.NodeType:
member.Type_ = item.TypeNode
member.Ref = o.GetNode(m.ID)
case osmpbf.WayType:
member.Type_ = item.TypeWay
member.Ref = o.GetWay(m.ID)
case osmpbf.RelationType:
member.Type_ = item.TypeRelation
member.Ref = o.GetRelation(m.ID)
}
if member.Ref == nil {
err = errors.New(fmt.Sprintf("Missing member #%d (%s) in way #%d", m.ID, member.Type(), v.ID))
o = nil
return
}
members = append(members, member)
}
r.Members_ = members
o.Relations[v.ID] = r
default:
log.Printf("ERROR: unknown type %T\n", v)
}
}
}
return
}
func (x *DotOSM) parseItem(line string) (i item.Item, err error) {
prefix, closed, m := x.parseLine(line)
var ts time.Time
if m["timestamp"] != "" {
ts, err = time.Parse(time.RFC3339, m["timestamp"])
if err != nil {
err = errors.New(fmt.Sprintf("Failed to parse timestamp '%s': %s\n", m["timestamp"], err))
return
}
}
switch prefix {
case "<node":
n := &node.Node{
Id_: str2int64(m["id"]),
User_: user.New(str2int64(m["uid"]), m["user"]),
Position_: point.New(str2float64(m["lat"]), str2float64(m["lon"])),
Timestamp_: ts,
Version_: str2int64(m["version"]),
Changeset_: str2int64(m["changeset"]),
Visible_: str2bool(m["visible"]),
}
if !closed {
n.Tags_ = x.parseTags("node")
}
// fmt.Printf("NODE=%q\n", n)
return n, nil
case "<way":
if closed {
err = errors.New(fmt.Sprintf("Way %s has no nodes\n", m["id"]))
return
}
w := &way.Way{
Id_: str2int64(m["id"]),
User_: user.New(str2int64(m["uid"]), m["user"]),
Timestamp_: ts,
Version_: str2int64(m["version"]),
Changeset_: str2int64(m["changeset"]),
Visible_: str2bool(m["visible"]),
}
var t *tags.Tags
var nd []*node.Node
t, nd, err = x.parseWay(str2int64(m["id"]))
if err != nil {
return
}
w.Tags_ = t
w.Nodes_ = nd
// fmt.Printf("WAY=%q\n", w)
return w, nil
case "<relation":
if closed {
err = errors.New(fmt.Sprintf("Relation %s has no members\n", m["id"]))
return
}
rel := &relation.Relation{
Id_: str2int64(m["id"]),
User_: user.New(str2int64(m["uid"]), m["user"]),
Timestamp_: ts,
Version_: str2int64(m["version"]),
Changeset_: str2int64(m["changeset"]),
Visible_: str2bool(m["visible"]),
}
members, tags := x.parseRelation(str2int64(m["id"]))
rel.Members_ = members
rel.Tags_ = tags
// fmt.Printf("RELATION=%q\n", rel)
return rel, nil
case "<osm":
// fmt.Printf("OSM=%q\n", m)
case "</osm>":
// fmt.Printf("/OSM\n")
case "<bounds":
// fmt.Printf("BOUNDS=%q\n", m)
default:
// fmt.Printf("OTHER=%q\n", m)
}
return &xmlItem{t: item.TypeUnknown}, nil
}