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geom_point.go
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geom_point.go
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package geography
import (
"database/sql/driver"
"encoding/binary"
"errors"
"fmt"
"strconv"
"github.com/go-courier/geography/encoding/mvt"
"github.com/go-courier/geography/encoding/wkb"
"github.com/go-courier/geography/encoding/wkt"
)
type Point [2]float64
func (p Point) IsZero() bool {
return p[0] == 0 && p[1] == 0
}
func (p Point) ToGeom() Geom {
return p
}
func (p Point) Clip(bound Bound) Geom {
if !bound.Intersects(p.Bound()) {
return nil
}
return p
}
func (p Point) Project(transform Transform) Geom {
return transform(p)
}
func (Point) Type() string {
return "Point"
}
func (p Point) Bound() Bound {
return Bound{p, p}
}
func (p Point) Equal(geom Geom) bool {
if point, ok := geom.(Point); ok {
return p[0] == point[0] && p[1] == point[1]
}
return false
}
func (p Point) X() float64 {
return p[0]
}
func (p Point) Y() float64 {
return p[1]
}
func (p Point) Lon() float64 {
return p[0]
}
func (p Point) Lat() float64 {
return p[1]
}
func (p *Point) UnmarshalWKB(r *wkb.WKBReader, order binary.ByteOrder, tpe wkb.GeometryType) error {
if tpe != wkb.PointType {
return errors.New("not point wkb")
}
if err := r.ReadBinary(order, &p[0]); err != nil {
return err
}
if err := r.ReadBinary(order, &p[1]); err != nil {
return err
}
switch r.SRS {
case SRS3857:
p[0], p[1] = PseudoMercatorToWGS84(p[0], p[1])
}
return nil
}
func (Point) DataType(driverName string) string {
if driverName == "mysql" {
return "POINT"
}
return "geometry(POINT)"
}
func (Point) Cap() int {
return 3
}
func (p Point) DrawFeature(w *mvt.FeatureWriter) {
w.MoveTo(1, func(i int) mvt.Coord {
return p
})
}
func (p Point) Geometry() []uint32 {
w := mvt.NewFeatureWriter(p.Cap())
p.DrawFeature(w)
return w.Data()
}
func (p Point) MarshalWKT(w *wkt.WKTWriter) {
x, y := p[0], p[1]
switch w.SRS {
case SRS3857:
x, y = WGS84ToPseudoMercator(x, y)
}
fmt.Fprintf(w, "%g %g", x, y)
}
func (Point) ValueEx() string {
return "ST_GeomFromText(?," + strconv.FormatInt(SRS3857, 10) + ")"
}
func (p Point) Value() (driver.Value, error) {
return wkt.MarshalWKT(p, SRS3857), nil
}
func (p *Point) Scan(src interface{}) error {
return scan(src, p)
}