points

Documentation

Index

• func Area(pts []maths.Pt) (a float64)
• func BBox(pts []maths.Pt) (bb [4]float64)
• func BBoxFloat64(pts ...[2]float64) (bb [2][2]float64, err error)
• func Centroid(pts []maths.Pt) (center maths.Pt)
• func Paired(pts []maths.Pt) ([][2]maths.Pt, error)
• func Reverse(a []maths.Pt) []maths.Pt
• func RotatePos(pts []maths.Pt, pos int)
• func RotateToLowestsFirst(pts []maths.Pt)
• func SinArea(pts []maths.Pt) (a float64)
• func SlopeIntercept(pt1, pt2 maths.Pt) (m, b float64, defined bool)
• func SortAndUnique(pts []maths.Pt) []maths.Pt
• type BoundingBox
  • func (bb BoundingBox) Area() float64
  • func (bb BoundingBox) AsGeoJSON() string
  • func (bb BoundingBox) ContainBB(bb1 [4]float64) bool
  • func (bb BoundingBox) Contains(pt maths.Pt) bool
  • func (bb BoundingBox) ContainsLine(l maths.Line) bool
  • func (bb BoundingBox) ConvertSRID(fromID, toID uint64) BoundingBox
  • func (bb BoundingBox) DisjointBB(bbox2 [4]float64) bool
  • func (bb BoundingBox) LREdges() [4]maths.Line
  • func (bb BoundingBox) PointAt(i int) maths.Pt
• type ByXY
  • func (t ByXY) Len() int
  • func (t ByXY) Less(i, j int) bool
  • func (t ByXY) Sort()
  • func (t ByXY) Swap(i, j int)
• type Extent
  • func (e Extent) Area() float64
  • func (e Extent) Contains(pt [2]float64) bool
  • func (e Extent) ContainsExtent(ee Extent) bool
  • func (e Extent) ContainsLine(line [2][2]float64) bool
  • func (e Extent) ContainsPoints(pts ...[2]float64) bool
  • func (e Extent) Edges() [][2][2]float64
  • func (e Extent) InclusiveContainsLine(line [2][2]float64) bool
  • func (e Extent) IntersectPt(ln [2][2]float64) (pts [][2]float64, ok bool)
  • func (e Extent) LREdges() [][2][2]float64
  • func (e Extent) LowerLeft() [2]float64
  • func (e Extent) LowerRight() [2]float64
  • func (e Extent) TopLeft() [2]float64
  • func (e Extent) TopRight() [2]float64
  • func (e Extent) Verticies() [][2]float64

Functions

func Area

func Area(pts []maths.Pt) (a float64)

func BBox

func BBox(pts []maths.Pt) (bb [4]float64)

TODO:gdey — should we return an error?

func BBoxFloat64

func BBoxFloat64(pts ...[2]float64) (bb [2][2]float64, err error)

func Centroid

func Centroid(pts []maths.Pt) (center maths.Pt)

func Paired

func Paired(pts []maths.Pt) ([][2]maths.Pt, error)

func Reverse

func Reverse(a []maths.Pt) []maths.Pt

func RotatePos

func RotatePos(pts []maths.Pt, pos int)

func RotateToLowestsFirst

func RotateToLowestsFirst(pts []maths.Pt)

func SinArea

func SinArea(pts []maths.Pt) (a float64)

func SlopeIntercept

func SlopeIntercept(pt1, pt2 maths.Pt) (m, b float64, defined bool)

func SortAndUnique

func SortAndUnique(pts []maths.Pt) []maths.Pt

Types

type BoundingBox

type BoundingBox [4]float64

func (BoundingBox) Area

func (bb BoundingBox) Area() float64

func (BoundingBox) AsGeoJSON

func (bb BoundingBox) AsGeoJSON() string

func (BoundingBox) ContainBB

func (bb BoundingBox) ContainBB(bb1 [4]float64) bool

func (BoundingBox) Contains

func (bb BoundingBox) Contains(pt maths.Pt) bool

func (BoundingBox) ContainsLine

func (bb BoundingBox) ContainsLine(l maths.Line) bool

func (BoundingBox) ConvertSRID

func (bb BoundingBox) ConvertSRID(fromID, toID uint64) BoundingBox

func (BoundingBox) DisjointBB

func (bb BoundingBox) DisjointBB(bbox2 [4]float64) bool

func (BoundingBox) LREdges

func (bb BoundingBox) LREdges() [4]maths.Line

func (BoundingBox) PointAt

func (bb BoundingBox) PointAt(i int) maths.Pt

type ByXY

type ByXY []maths.Pt

func (ByXY) Len

func (t ByXY) Len() int

func (ByXY) Less

func (t ByXY) Less(i, j int) bool

func (ByXY) Sort

func (t ByXY) Sort()

func (ByXY) Swap

func (t ByXY) Swap(i, j int)

type Extent

type Extent [2][2]float64

Extent describes a retangular region.

func (Extent) Area

func (e Extent) Area() float64

Area returns the are of the Extent.

func (Extent) Contains

func (e Extent) Contains(pt [2]float64) bool

Contains return weather the point is contained by the Extent.

func (Extent) ContainsExtent

func (e Extent) ContainsExtent(ee Extent) bool

ContainsExtent returns weather the points of the second extent are containted by the first extent.

func (Extent) ContainsLine

func (e Extent) ContainsLine(line [2][2]float64) bool

ContainsLine returns weather both points of the line are contained by the Extent.

func (Extent) ContainsPoints

func (e Extent) ContainsPoints(pts ...[2]float64) bool

ContainsPoints returns weather all the given points are contained by the Extent.

func (Extent) Edges

func (e Extent) Edges() [][2][2]float64

Edges return in clockwise order the edges that make up this extent. And edge is a line made up of two points.

func (Extent) InclusiveContainsLine

func (e Extent) InclusiveContainsLine(line [2][2]float64) bool

func (Extent) IntersectPt

func (e Extent) IntersectPt(ln [2][2]float64) (pts [][2]float64, ok bool)

IntersectPt returns the intersect point if one exists.

func (Extent) LREdges

func (e Extent) LREdges() [][2][2]float64

LREdges returns the edges of the region so that the upper left most edges to the lower right edges are returned. Basically sorting by the x values first then the y values.

func (Extent) LowerLeft

func (e Extent) LowerLeft() [2]float64

func (Extent) LowerRight

func (e Extent) LowerRight() [2]float64

func (Extent) TopLeft

func (e Extent) TopLeft() [2]float64

func (Extent) TopRight

func (e Extent) TopRight() [2]float64

func (Extent) Verticies

func (e Extent) Verticies() [][2]float64

Verticies return the verticies of the Extent.