tile_system

package

v0.0.10-a Latest Latest Go to latest Published: May 3, 2016 License: MIT Imports: 7 Imported by: 0

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Valid go.mod file
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Repository

github.com/buckhx/dynamic-tile-server

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Documentation ¶

Overview ¶

package tile_system is a collection of conversion utilities to go between geo/pixel/tile/quadkey space This package uses WGS84 coordinates and a mercator projection

Index ¶

Constants
Variables
func CoordinateToTile(lat, lon float64, zoom uint) (Tile, TilePixel)
type Coords
- func ClippedCoords(lat, lon float64) Coords
type Pixel
type Tile
- func TileFromQuadKey(quadkey string) (tile Tile)
type TileIndex
type TilePixel
- func (p TilePixel) ToCoords() Coords

Constants ¶

View Source

const (
	MinLat       float64 = -85.05112878
	MaxLat       float64 = 85.05112878
	MinLon       float64 = -180
	MaxLon       float64 = 180
	EarthRadiusM float64 = 6378137
)

Variables ¶

View Source

var TileSize uint = 256

Functions ¶

func CoordinateToTile ¶

func CoordinateToTile(lat, lon float64, zoom uint) (Tile, TilePixel)

Types ¶

func ClippedCoords ¶

func ClippedCoords(lat, lon float64) Coords

Coords that have been clipped to Max/Min Lat/Lon

func (Coords) Equals ¶

func (c Coords) Equals(that Coords) bool

func (Coords) String ¶

func (c Coords) String() string

func (Coords) ToPixel ¶

func (c Coords) ToPixel(zoom uint) Pixel

Get the Pixel of the pixel at the zoom level

type Pixel ¶

type Pixel struct {
	X, Y, Z uint
}

Pixel in a WGS84 Mercator map projection with a NW origin (0,0) of the projection

func (Pixel) FloatX ¶

func (p Pixel) FloatX() float64

func (Pixel) FloatY ¶

func (p Pixel) FloatY() float64

func (Pixel) ToCoords ¶

func (p Pixel) ToCoords() Coords

func (Pixel) ToTile ¶

func (p Pixel) ToTile() (tile Tile, tilePixel TilePixel)

Gets the tile that contains this pixel as well as the pixel within that tile.

type Tile ¶

type Tile struct {
	X, Y, Z uint
}

func TileFromQuadKey ¶

func TileFromQuadKey(quadkey string) (tile Tile)

func (Tile) IntX ¶

func (t Tile) IntX() int

func (Tile) IntY ¶

func (t Tile) IntY() int

func (Tile) IntZ ¶

func (t Tile) IntZ() int

func (Tile) QuadKey ¶

func (t Tile) QuadKey() string

func (Tile) ToPixel ¶

func (t Tile) ToPixel() Pixel

func (Tile) ToPixelWithOffset ¶

func (t Tile) ToPixelWithOffset(offset Pixel) (pixel Pixel)

type TileIndex ¶

type TileIndex struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

TileIndex stores indexes values by tile. If a deep level of tile is added and a shallower one is requested, the values are aggregated up. TileIndex is thread safe implementation uses a sorted keyset, trie would be better

func (*TileIndex) Add ¶

func (idx *TileIndex) Add(t Tile, val interface{})

Add adds a value, but will not be indexed

func (*TileIndex) TileRange ¶

func (idx *TileIndex) TileRange(zmin, zmax int) <-chan Tile

TileRange returns a channel of all tiles in the index in the zoom range If zmax is greater than the deepest tile level, the deepest tile level returns Acquires a readlock for duration of returned channel being open

func (*TileIndex) Values ¶

func (idx *TileIndex) Values(t Tile) (vals []interface{})

Values returns a list of values aggregated under the requested tile

type TilePixel ¶

type TilePixel struct {
	X, Y uint
	Tile *Tile
}

Pixel whose origin (0,0) is NW corner of Tile

func (TilePixel) ToCoords ¶

func (p TilePixel) ToCoords() Coords

Source Files ¶

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