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geom_multi_polygon.go
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geom_multi_polygon.go
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package geography
import (
"database/sql/driver"
"encoding/binary"
"errors"
"strconv"
"github.com/go-courier/geography/encoding/mvt"
"github.com/go-courier/geography/encoding/wkb"
"github.com/go-courier/geography/encoding/wkt"
)
type MultiPolygon []Polygon
func (mp MultiPolygon) ToGeom() Geom {
return mp
}
func (mp MultiPolygon) Clip(b Bound) Geom {
var result MultiPolygon
for i := range mp {
g := mp[i].Clip(b)
if g != nil {
result = append(result, g.(Polygon))
}
}
return result
}
func (mp MultiPolygon) Project(transform Transform) Geom {
nextMp := make(MultiPolygon, len(mp))
for i := range mp {
nextMp[i] = mp[i].Project(transform).(Polygon)
}
return nextMp
}
func (MultiPolygon) Type() string {
return "MultiPolygon"
}
func (mp MultiPolygon) Bound() Bound {
if len(mp) == 0 {
return emptyBound
}
bound := mp[0].Bound()
for i := 1; i < len(mp); i++ {
bound = bound.Union(mp[i].Bound())
}
return bound
}
func (mp MultiPolygon) Equal(g Geom) bool {
switch multiPolygon := g.(type) {
case MultiPolygon:
if len(mp) != len(multiPolygon) {
return false
}
for i, p := range mp {
if !p.Equal(multiPolygon[i]) {
return false
}
}
return true
}
return false
}
func (mp MultiPolygon) MarshalWKT(w *wkt.WKTWriter) {
for i, polygon := range mp {
w.WriteGroup(polygon.MarshalWKT, i)
}
}
func (mp *MultiPolygon) UnmarshalWKB(r *wkb.WKBReader, order binary.ByteOrder, tpe wkb.GeometryType) error {
if tpe != wkb.MultiPolygonType {
return errors.New("not multi line string wkb")
}
var numOfPolygons uint32
if err := r.ReadBinary(order, &numOfPolygons); err != nil {
return err
}
result := make(MultiPolygon, 0, numOfPolygons)
for i := 0; i < int(numOfPolygons); i++ {
p := Polygon{}
if err := r.ReadWKB(&p); err != nil {
return err
}
result = append(result, p)
}
*mp = result
return nil
}
func (mp MultiPolygon) Cap() int {
c := 0
for _, p := range mp {
c += p.Cap()
}
return c
}
func (mp MultiPolygon) DrawFeature(w *mvt.FeatureWriter) {
for _, p := range mp {
p.DrawFeature(w)
}
}
func (mp MultiPolygon) Geometry() []uint32 {
w := mvt.NewFeatureWriter(mp.Cap())
mp.DrawFeature(w)
return w.Data()
}
func (MultiPolygon) DataType(driverName string) string {
if driverName == "mysql" {
return "MULTIPOLYGON"
}
return "geometry(MULTIPOLYGON)"
}
func (MultiPolygon) ValueEx() string {
return "ST_GeomFromText(?," + strconv.FormatInt(SRS3857, 10) + ")"
}
func (mp MultiPolygon) Value() (driver.Value, error) {
return wkt.MarshalWKT(mp, SRS3857), nil
}
func (mp *MultiPolygon) Scan(src interface{}) error {
return scan(src, mp)
}