package tilecover

import "github.com/paulmach/orb/maptile/tilecover"

Package tilecover computes the covering set of tiles for an orb.Geometry.

Index ¶

• Variables
• func Bound(b orb.Bound, z maptile.Zoom) maptile.Set
• func Collection(c orb.Collection, z maptile.Zoom) (maptile.Set, error)
• func Geometry(g orb.Geometry, z maptile.Zoom) (maptile.Set, error)
• func LineString(ls orb.LineString, z maptile.Zoom) maptile.Set
• func MergeUp(set maptile.Set, min maptile.Zoom) maptile.Set
• func MergeUpPartial(set maptile.Set, min maptile.Zoom, count int) maptile.Set
• func MultiLineString(mls orb.MultiLineString, z maptile.Zoom) maptile.Set
• func MultiPoint(mp orb.MultiPoint, z maptile.Zoom) maptile.Set
• func MultiPolygon(mp orb.MultiPolygon, z maptile.Zoom) (maptile.Set, error)
• func Point(ll orb.Point, z maptile.Zoom) maptile.Set
• func Polygon(p orb.Polygon, z maptile.Zoom) (maptile.Set, error)
• func Ring(r orb.Ring, z maptile.Zoom) (maptile.Set, error)

Variables ¶

var ErrUnevenIntersections = errors.New("tilecover: uneven intersections, ring not closed?")

ErrUnevenIntersections can be returned when clipping polygons and there are issues with the geometries, like the rings are not closed.

Functions ¶

func Bound ¶

func Bound(b orb.Bound, z maptile.Zoom) maptile.Set

Bound creates a tile cover for the bound. i.e. all the tiles that intersect the bound.

func Collection ¶

func Collection(c orb.Collection, z maptile.Zoom) (maptile.Set, error)

Collection returns the covering set of tiles for the geometry collection.

func Geometry ¶

func Geometry(g orb.Geometry, z maptile.Zoom) (maptile.Set, error)

Geometry returns the covering set of tiles for the given geometry.

func LineString ¶

func LineString(ls orb.LineString, z maptile.Zoom) maptile.Set

LineString creates a tile cover for the line string.

func MergeUp ¶

func MergeUp(set maptile.Set, min maptile.Zoom) maptile.Set

MergeUp will merge up the tiles in a given set up to the the give min zoom. Tiles will be merged up only if all 4 siblings are in the set. The tiles in the input set are expected to all be of the same zoom, e.g. outputs of the Geometry function.

func MergeUpPartial ¶

func MergeUpPartial(set maptile.Set, min maptile.Zoom, count int) maptile.Set

MergeUpPartial will merge up the tiles in a given set up to the the give min zoom. Tiles will be merged up if `count` siblings are in the set. The tiles in the input set are expected to all be of the same zoom, e.g. outputs of the Geometry function.

func MultiLineString ¶

func MultiLineString(mls orb.MultiLineString, z maptile.Zoom) maptile.Set

MultiLineString creates a tile cover for the line strings.

func MultiPoint ¶

func MultiPoint(mp orb.MultiPoint, z maptile.Zoom) maptile.Set

MultiPoint creates a tile cover for the set of points,

func MultiPolygon ¶

func MultiPolygon(mp orb.MultiPolygon, z maptile.Zoom) (maptile.Set, error)

MultiPolygon creates a tile cover for the multi-polygon.

func Point ¶

func Point(ll orb.Point, z maptile.Zoom) maptile.Set

Point creates a tile cover for the point, i.e. just the tile containing the point.

func Polygon ¶

func Polygon(p orb.Polygon, z maptile.Zoom) (maptile.Set, error)

Polygon creates a tile cover for the polygon.

func Ring ¶

func Ring(r orb.Ring, z maptile.Zoom) (maptile.Set, error)

Ring creates a tile cover for the ring.

Source Files ¶

helpers.go line_string.go merge.go polygon.go