proj4

README

go-proj4

PROJ.4 binding for go with PROJ.4 embeded.

If you need to use other init/grid files, please use environment variable PROJ_LIB.

LICENSE

MIT, see LICENSE file

Documentation

Index

• func Asset(name string) ([]byte, error)
• func AssetDir(name string) ([]string, error)
• func AssetInfo(name string) (os.FileInfo, error)
• func AssetNames() []string
• func MustAsset(name string) []byte
• func RestoreAsset(dir, name string) error
• func RestoreAssets(dir, name string) error
• type Proj4
  • func NewProj4(def string) (*Proj4, error)
  • func (p *Proj4) Forward(lng, lat float64) (x, y float64, err error)
  • func (p *Proj4) Free()
  • func (p *Proj4) Inverse(x, y float64) (lng, lat float64, err error)
  • func (p *Proj4) IsLatLong() bool
  • func (p *Proj4) Transform(dst *Proj4, xs, ys []float64) error
  • func (p *Proj4) TransformPoint(dst *Proj4, x, y *float64) error

Functions

func Asset

func Asset(name string) ([]byte, error)

Asset loads and returns the asset for the given name. It returns an error if the asset could not be found or could not be loaded.

func AssetDir

func AssetDir(name string) ([]string, error)

AssetDir returns the file names below a certain directory embedded in the file by go-bindata. For example if you run go-bindata on data/... and data contains the following hierarchy:

data/
  foo.txt
  img/
    a.png
    b.png

then AssetDir("data") would return []string{"foo.txt", "img"} AssetDir("data/img") would return []string{"a.png", "b.png"} AssetDir("foo.txt") and AssetDir("notexist") would return an error AssetDir("") will return []string{"data"}.

func AssetInfo

func AssetInfo(name string) (os.FileInfo, error)

AssetInfo loads and returns the asset info for the given name. It returns an error if the asset could not be found or could not be loaded.

func AssetNames

func AssetNames() []string

AssetNames returns the names of the assets.

func MustAsset

func MustAsset(name string) []byte

MustAsset is like Asset but panics when Asset would return an error. It simplifies safe initialization of global variables.

func RestoreAsset

func RestoreAsset(dir, name string) error

RestoreAsset restores an asset under the given directory

func RestoreAssets

func RestoreAssets(dir, name string) error

RestoreAssets restores an asset under the given directory recursively

Types

type Proj4

type Proj4 struct {
	// contains filtered or unexported fields
}

Proj4 represents a proj4 style projection

func NewProj4

func NewProj4(def string) (*Proj4, error)

NewProj4 create new projection from proj4 string (e.g. "+proj=longlat +datum=WGS84 +no_defs").

func (*Proj4) Forward

func (p *Proj4) Forward(lng, lat float64) (x, y float64, err error)

Forward forward point.

func (*Proj4) Free

func (p *Proj4) Free()

Free deallocates the projection.

func (*Proj4) Inverse

func (p *Proj4) Inverse(x, y float64) (lng, lat float64, err error)

Inverse inverse point.

func (*Proj4) IsLatLong

func (p *Proj4) IsLatLong() bool

IsLatLong return true if under proj is geographic

func (*Proj4) Transform

func (p *Proj4) Transform(dst *Proj4, xs, ys []float64) error

Transform transform points to dst projection in place.

func (*Proj4) TransformPoint

func (p *Proj4) TransformPoint(dst *Proj4, x, y *float64) error

TransformPoint transform point to dst projection in place.