Documentation ¶
Overview ¶
Package geom implements efficient geometry types for geospatial applications.
Index ¶
- Constants
- func PointEmptyCoord() float64
- type Bounds
- func (b *Bounds) Clone() *Bounds
- func (b *Bounds) Extend(g T) *Bounds
- func (b *Bounds) IsEmpty() bool
- func (b *Bounds) Layout() Layout
- func (b *Bounds) Max(dim int) float64
- func (b *Bounds) Min(dim int) float64
- func (b *Bounds) Overlaps(layout Layout, b2 *Bounds) bool
- func (b *Bounds) OverlapsPoint(layout Layout, point Coord) bool
- func (b *Bounds) Polygon() *Polygon
- func (b *Bounds) Set(args ...float64) *Bounds
- func (b *Bounds) SetCoords(min, max Coord) *Bounds
- type Coord
- type ErrLayoutMismatch
- type ErrStrideMismatch
- type ErrUnsupportedLayout
- type ErrUnsupportedType
- type Geom0
- func (g *Geom0) Bounds() *Bounds
- func (g *Geom0) Coords() Coord
- func (g *Geom0) Empty() bool
- func (g *Geom0) Ends() []int
- func (g *Geom0) Endss() [][]int
- func (g *Geom0) FlatCoords() []float64
- func (g *Geom0) Layout() Layout
- func (g *Geom0) NumCoords() int
- func (g *Geom0) Reserve(n int)
- func (g *Geom0) SRID() int
- func (g *Geom0) Stride() int
- type GeometryCollection
- func (g *GeometryCollection) Bounds() *Bounds
- func (g *GeometryCollection) CheckLayout(layout Layout) error
- func (g *GeometryCollection) Empty() bool
- func (g *GeometryCollection) Ends() []int
- func (g *GeometryCollection) Endss() [][]int
- func (g *GeometryCollection) FlatCoords() []float64
- func (g *GeometryCollection) Geom(i int) T
- func (g *GeometryCollection) Geoms() []T
- func (g *GeometryCollection) Layout() Layout
- func (g *GeometryCollection) MustPush(gs ...T) *GeometryCollection
- func (g *GeometryCollection) MustSetLayout(layout Layout) *GeometryCollection
- func (g *GeometryCollection) NumGeoms() int
- func (g *GeometryCollection) Push(gs ...T) error
- func (g *GeometryCollection) SRID() int
- func (g *GeometryCollection) SetLayout(layout Layout) error
- func (g *GeometryCollection) SetSRID(srid int) *GeometryCollection
- func (g *GeometryCollection) Stride() int
- type Layout
- type LineString
- func (g *LineString) Area() float64
- func (g *LineString) Clone() *LineString
- func (g *LineString) Coord(i int) Coord
- func (g *LineString) Coords() []Coord
- func (g *LineString) Interpolate(val float64, dim int) (int, float64)
- func (g *LineString) Length() float64
- func (g *LineString) MustSetCoords(coords []Coord) *LineString
- func (g *LineString) NumCoords() int
- func (g *LineString) Reverse()
- func (g *LineString) SetCoords(coords []Coord) (*LineString, error)
- func (g *LineString) SetSRID(srid int) *LineString
- func (g *LineString) SubLineString(start, stop int) *LineString
- func (g *LineString) Swap(g2 *LineString)
- type LinearRing
- func (g *LinearRing) Area() float64
- func (g *LinearRing) Clone() *LinearRing
- func (g *LinearRing) Coord(i int) Coord
- func (g *LinearRing) Coords() []Coord
- func (g *LinearRing) Length() float64
- func (g *LinearRing) MustSetCoords(coords []Coord) *LinearRing
- func (g *LinearRing) NumCoords() int
- func (g *LinearRing) Reverse()
- func (g *LinearRing) SetCoords(coords []Coord) (*LinearRing, error)
- func (g *LinearRing) SetSRID(srid int) *LinearRing
- func (g *LinearRing) Swap(g2 *LinearRing)
- type MultiLineString
- func (g *MultiLineString) Area() float64
- func (g *MultiLineString) Clone() *MultiLineString
- func (g *MultiLineString) Coords() [][]Coord
- func (g *MultiLineString) Ends() []int
- func (g *MultiLineString) Length() float64
- func (g *MultiLineString) LineString(i int) *LineString
- func (g *MultiLineString) MustSetCoords(coords [][]Coord) *MultiLineString
- func (g *MultiLineString) NumLineStrings() int
- func (g *MultiLineString) Push(ls *LineString) error
- func (g *MultiLineString) Reverse()
- func (g *MultiLineString) SetCoords(coords [][]Coord) (*MultiLineString, error)
- func (g *MultiLineString) SetSRID(srid int) *MultiLineString
- func (g *MultiLineString) Swap(g2 *MultiLineString)
- type MultiPoint
- func (g *MultiPoint) Area() float64
- func (g *MultiPoint) Clone() *MultiPoint
- func (g *MultiPoint) Coord(i int) Coord
- func (g *MultiPoint) Coords() []Coord
- func (g *MultiPoint) Ends() []int
- func (g *MultiPoint) Length() float64
- func (g *MultiPoint) MustSetCoords(coords []Coord) *MultiPoint
- func (g *MultiPoint) NumCoords() int
- func (g *MultiPoint) NumPoints() int
- func (g *MultiPoint) Point(i int) *Point
- func (g *MultiPoint) Push(p *Point) error
- func (g *MultiPoint) Reverse()
- func (g *MultiPoint) SetCoords(coords []Coord) (*MultiPoint, error)
- func (g *MultiPoint) SetSRID(srid int) *MultiPoint
- func (g *MultiPoint) Swap(g2 *MultiPoint)
- type MultiPolygon
- func (g *MultiPolygon) Area() float64
- func (g *MultiPolygon) Clone() *MultiPolygon
- func (g *MultiPolygon) Coords() [][][]Coord
- func (g *MultiPolygon) Endss() [][]int
- func (g *MultiPolygon) Length() float64
- func (g *MultiPolygon) MustSetCoords(coords [][][]Coord) *MultiPolygon
- func (g *MultiPolygon) NumPolygons() int
- func (g *MultiPolygon) Polygon(i int) *Polygon
- func (g *MultiPolygon) Push(p *Polygon) error
- func (g *MultiPolygon) Reverse()
- func (g *MultiPolygon) SetCoords(coords [][][]Coord) (*MultiPolygon, error)
- func (g *MultiPolygon) SetSRID(srid int) *MultiPolygon
- func (g *MultiPolygon) Swap(g2 *MultiPolygon)
- type NewMultiPointFlatOption
- type Point
- func (g *Point) Area() float64
- func (g *Point) Clone() *Point
- func (g *Point) Length() float64
- func (g *Point) M() float64
- func (g *Point) MustSetCoords(coords Coord) *Point
- func (g *Point) SetCoords(coords Coord) (*Point, error)
- func (g *Point) SetSRID(srid int) *Point
- func (g *Point) Swap(g2 *Point)
- func (g *Point) X() float64
- func (g *Point) Y() float64
- func (g *Point) Z() float64
- type Polygon
- func (g *Polygon) Area() float64
- func (g *Polygon) Clone() *Polygon
- func (g *Polygon) Coords() [][]Coord
- func (g *Polygon) Ends() []int
- func (g *Polygon) Length() float64
- func (g *Polygon) LinearRing(i int) *LinearRing
- func (g *Polygon) MustSetCoords(coords [][]Coord) *Polygon
- func (g *Polygon) NumLinearRings() int
- func (g *Polygon) Push(lr *LinearRing) error
- func (g *Polygon) Reverse()
- func (g *Polygon) SetCoords(coords [][]Coord) (*Polygon, error)
- func (g *Polygon) SetSRID(srid int) *Polygon
- func (g *Polygon) Swap(g2 *Polygon)
- type T
Examples ¶
Constants ¶
const PointEmptyCoordHex = 0x7FF8000000000000
PointEmptyCoordHex is the hex representation of a NaN that represents an empty coord in a shape.
Variables ¶
This section is empty.
Functions ¶
func PointEmptyCoord ¶
func PointEmptyCoord() float64
PointEmptyCoord is the NaN float64 representation of the empty coordinate.
Types ¶
type Bounds ¶
type Bounds struct {
// contains filtered or unexported fields
}
A Bounds represents a multi-dimensional bounding box.
func (*Bounds) OverlapsPoint ¶
OverlapsPoint determines if the bounding box overlaps the point (point is within or on the border of the bounds).
func (*Bounds) Set ¶
Set sets the minimum and maximum values. args must be an even number of values: the first half are the minimum values for each dimension and the second half are the maximum values for each dimension. If necessary, the layout of b will be extended to cover all the supplied dimensions implied by args.
type Coord ¶
type Coord []float64
A Coord represents an N-dimensional coordinate.
func (Coord) Equal ¶
Equal compares that all ordinates are the same in this and the other coords. It is assumed that this coord and other coord both have the same (provided) layout.
type ErrLayoutMismatch ¶
An ErrLayoutMismatch is returned when geometries with different layouts cannot be combined.
func (ErrLayoutMismatch) Error ¶
func (e ErrLayoutMismatch) Error() string
type ErrStrideMismatch ¶
An ErrStrideMismatch is returned when the stride does not match the expected stride.
func (ErrStrideMismatch) Error ¶
func (e ErrStrideMismatch) Error() string
type ErrUnsupportedLayout ¶
type ErrUnsupportedLayout Layout
An ErrUnsupportedLayout is returned when the requested layout is not supported.
func (ErrUnsupportedLayout) Error ¶
func (e ErrUnsupportedLayout) Error() string
type ErrUnsupportedType ¶
type ErrUnsupportedType struct {
Value interface{}
}
An ErrUnsupportedType is returned when the requested type is not supported.
func (ErrUnsupportedType) Error ¶
func (e ErrUnsupportedType) Error() string
type Geom0 ¶
type Geom0 struct { FlatCoordinates []float64 // contains filtered or unexported fields }
func (*Geom0) Endss ¶
Endss returns the end indexes of sub-sub-structures of g, i.e. an empty slice.
func (*Geom0) FlatCoords ¶
FlatCoordinates returns the flat coordinates of g.
type GeometryCollection ¶
type GeometryCollection struct {
// contains filtered or unexported fields
}
A GeometryCollection is a collection of arbitrary geometries with the same SRID.
func NewGeometryCollection ¶
func NewGeometryCollection() *GeometryCollection
NewGeometryCollection returns a new empty GeometryCollection.
func (*GeometryCollection) Bounds ¶
func (g *GeometryCollection) Bounds() *Bounds
Bounds returns the bounds of all the geometries in g.
func (*GeometryCollection) CheckLayout ¶
func (g *GeometryCollection) CheckLayout(layout Layout) error
CheckLayout checks all geometries in the collection match the given layout.
func (*GeometryCollection) Empty ¶
func (g *GeometryCollection) Empty() bool
Empty returns true if the collection is empty. This can return true if the GeometryCollection contains multiple Geometry objects which are all empty.
func (*GeometryCollection) FlatCoords ¶
func (g *GeometryCollection) FlatCoords() []float64
FlatCoords panics.
func (*GeometryCollection) Geom ¶
func (g *GeometryCollection) Geom(i int) T
Geom returns the ith geometry in g.
func (*GeometryCollection) Geoms ¶
func (g *GeometryCollection) Geoms() []T
Geoms returns the geometries in g.
func (*GeometryCollection) Layout ¶
func (g *GeometryCollection) Layout() Layout
Layout returns the smallest layout that covers all of the layouts in g's geometries.
func (*GeometryCollection) MustPush ¶
func (g *GeometryCollection) MustPush(gs ...T) *GeometryCollection
MustPush pushes gs to g. It panics on any error.
func (*GeometryCollection) MustSetLayout ¶
func (g *GeometryCollection) MustSetLayout(layout Layout) *GeometryCollection
MustSetLayout sets g's layout. It panics on any error.
func (*GeometryCollection) NumGeoms ¶
func (g *GeometryCollection) NumGeoms() int
NumGeoms returns the number of geometries in g.
func (*GeometryCollection) Push ¶
func (g *GeometryCollection) Push(gs ...T) error
Push appends geometries.
func (*GeometryCollection) SetLayout ¶
func (g *GeometryCollection) SetLayout(layout Layout) error
SetLayout sets g's layout.
func (*GeometryCollection) SetSRID ¶
func (g *GeometryCollection) SetSRID(srid int) *GeometryCollection
SetSRID sets g's SRID and the SRID of all its elements.
func (*GeometryCollection) Stride ¶
func (g *GeometryCollection) Stride() int
Stride returns the stride of g's layout.
type Layout ¶
type Layout int
A Layout describes the meaning of an N-dimensional coordinate. Layout(N) for N > 4 is a valid layout, in which case the first dimensions are interpreted to be X, Y, Z, and M and extra dimensions have no special meaning. M values are considered part of a linear referencing system (e.g. classical time or distance along a path). 1-dimensional layouts are not supported.
func (Layout) MIndex ¶
MIndex returns the index of the M dimension, or -1 if the l does not have an M dimension.
type LineString ¶
type LineString struct {
// contains filtered or unexported fields
}
A LineString represents a single, unbroken line, linearly interpreted between zero or more control points.
func NewLineString ¶
func NewLineString(l Layout) *LineString
NewLineString returns a new LineString with layout l and no control points.
func NewLineStringFlat ¶
func NewLineStringFlat(layout Layout, flatCoords []float64) *LineString
NewLineStringFlat returns a new LineString with layout l and control points FlatCoordinates.
func (*LineString) Area ¶
func (g *LineString) Area() float64
Area returns the area of g, i.e. zero.
func (*LineString) Clone ¶
func (g *LineString) Clone() *LineString
Clone returns a copy of g that does not alias g.
func (*LineString) Coords ¶
func (g *LineString) Coords() []Coord
Coords unpacks and returns all of g's coFlatCoordsordinates.
func (*LineString) Interpolate ¶
func (g *LineString) Interpolate(val float64, dim int) (int, float64)
Interpolate returns the index and delta of val in dimension dim.
func (*LineString) MustSetCoords ¶
func (g *LineString) MustSetCoords(coords []Coord) *LineString
MustSetCoords is like SetCoords but it panics on any error.
func (*LineString) NumCoords ¶
func (g *LineString) NumCoords() int
NumCoords returns the number of coordinates in g.
func (*LineString) Reverse ¶
func (g *LineString) Reverse()
Reverse reverses the order of g's coordinates.
func (*LineString) SetCoords ¶
func (g *LineString) SetCoords(coords []Coord) (*LineString, error)
SetCoords sets the coordinates of g.
func (*LineString) SetSRID ¶
func (g *LineString) SetSRID(srid int) *LineString
SetSRID sets the SRID of g.
func (*LineString) SubLineString ¶
func (g *LineString) SubLineString(start, stop int) *LineString
SubLineString returns a LineString from starts at index start and stops at index stop of g. The returned LineString aliases g.
func (*LineString) Swap ¶
func (g *LineString) Swap(g2 *LineString)
Swap swaps the values of g and g2.
type LinearRing ¶
type LinearRing struct {
// contains filtered or unexported fields
}
A LinearRing is a linear ring.
func NewLinearRing ¶
func NewLinearRing(layout Layout) *LinearRing
NewLinearRing returns a new LinearRing with no coordinates.
func NewLinearRingFlat ¶
func NewLinearRingFlat(layout Layout, flatCoords []float64) *LinearRing
NewLinearRingFlat returns a new LinearRing with the given flat coordinates.
func (*LinearRing) Coords ¶
func (g *LinearRing) Coords() []Coord
Coords unpacks and returns all of g's coFlatCoordsordinates.
func (*LinearRing) Length ¶
func (g *LinearRing) Length() float64
Length returns the length of the perimeter.
func (*LinearRing) MustSetCoords ¶
func (g *LinearRing) MustSetCoords(coords []Coord) *LinearRing
MustSetCoords sets the coordinates and panics if there is any error.
func (*LinearRing) NumCoords ¶
func (g *LinearRing) NumCoords() int
NumCoords returns the number of coordinates in g.
func (*LinearRing) Reverse ¶
func (g *LinearRing) Reverse()
Reverse reverses the order of g's coordinates.
func (*LinearRing) SetCoords ¶
func (g *LinearRing) SetCoords(coords []Coord) (*LinearRing, error)
SetCoords sets the coordinates.
func (*LinearRing) SetSRID ¶
func (g *LinearRing) SetSRID(srid int) *LinearRing
SetSRID sets the SRID of g.
func (*LinearRing) Swap ¶
func (g *LinearRing) Swap(g2 *LinearRing)
Swap swaps the values of g and g2.
type MultiLineString ¶
type MultiLineString struct {
// contains filtered or unexported fields
}
A MultiLineString is a collection of LineStrings.
func NewMultiLineString ¶
func NewMultiLineString(layout Layout) *MultiLineString
NewMultiLineString returns a new MultiLineString with no LineStrings.
func NewMultiLineStringFlat ¶
func NewMultiLineStringFlat(layout Layout, flatCoords []float64, ends []int) *MultiLineString
NewMultiLineStringFlat returns a new MultiLineString with the given flat coordinates.
func (*MultiLineString) Area ¶
func (g *MultiLineString) Area() float64
Area returns the area of g, i.e. 0.
func (*MultiLineString) Clone ¶
func (g *MultiLineString) Clone() *MultiLineString
Clone returns a deep copy.
func (*MultiLineString) Coords ¶
func (g *MultiLineString) Coords() [][]Coord
Coords returns all of g's coordinates.
func (*MultiLineString) Ends ¶
func (g *MultiLineString) Ends() []int
Ends returns the end indexes of all sub-structures in g.
func (*MultiLineString) Length ¶
func (g *MultiLineString) Length() float64
Length returns the sum of the length of the LineStrings.
func (*MultiLineString) LineString ¶
func (g *MultiLineString) LineString(i int) *LineString
LineString returns the ith LineString.
func (*MultiLineString) MustSetCoords ¶
func (g *MultiLineString) MustSetCoords(coords [][]Coord) *MultiLineString
MustSetCoords sets the coordinates and panics on any error.
func (*MultiLineString) NumLineStrings ¶
func (g *MultiLineString) NumLineStrings() int
NumLineStrings returns the number of LineStrings.
func (*MultiLineString) Push ¶
func (g *MultiLineString) Push(ls *LineString) error
Push appends a LineString.
func (*MultiLineString) Reverse ¶
func (g *MultiLineString) Reverse()
Reverse reverses the order of coordinates for each sub-structure in g.
func (*MultiLineString) SetCoords ¶
func (g *MultiLineString) SetCoords(coords [][]Coord) (*MultiLineString, error)
SetCoords sets the coordinates.
func (*MultiLineString) SetSRID ¶
func (g *MultiLineString) SetSRID(srid int) *MultiLineString
SetSRID sets the SRID of g.
func (*MultiLineString) Swap ¶
func (g *MultiLineString) Swap(g2 *MultiLineString)
Swap swaps the values of g and g2.
type MultiPoint ¶
type MultiPoint struct {
// contains filtered or unexported fields
}
A MultiPoint is a collection of Points.
func NewMultiPoint ¶
func NewMultiPoint(layout Layout) *MultiPoint
NewMultiPoint returns a new, empty, MultiPoint.
func NewMultiPointFlat ¶
func NewMultiPointFlat( layout Layout, flatCoords []float64, opts ...NewMultiPointFlatOption, ) *MultiPoint
NewMultiPointFlat returns a new MultiPoint with the given flat coordinates. Assumes no points are empty by default. Use `NewMultiPointFlatOptionWithEnds` to specify empty points.
func (*MultiPoint) Area ¶
func (g *MultiPoint) Area() float64
Area returns the area of g, i.e. zero.
func (*MultiPoint) Coord ¶
func (g *MultiPoint) Coord(i int) Coord
Coord returns the ith coord of g.
func (*MultiPoint) Coords ¶
func (g *MultiPoint) Coords() []Coord
Coords unpacks and returns all of g's coordinates.
func (*MultiPoint) Ends ¶
func (g *MultiPoint) Ends() []int
Ends returns the end indexes of all sub-structures in g.
func (*MultiPoint) MustSetCoords ¶
func (g *MultiPoint) MustSetCoords(coords []Coord) *MultiPoint
MustSetCoords sets the coordinates and panics on any error.
func (*MultiPoint) NumCoords ¶
func (g *MultiPoint) NumCoords() int
NumCoords returns the number of coordinates in g.
func (*MultiPoint) NumPoints ¶
func (g *MultiPoint) NumPoints() int
NumPoints returns the number of Points.
func (*MultiPoint) Reverse ¶
func (g *MultiPoint) Reverse()
Reverse reverses the order of coordinates for each sub-structure in g.
func (*MultiPoint) SetCoords ¶
func (g *MultiPoint) SetCoords(coords []Coord) (*MultiPoint, error)
SetCoords sets the coordinates.
func (*MultiPoint) SetSRID ¶
func (g *MultiPoint) SetSRID(srid int) *MultiPoint
SetSRID sets the SRID of g.
func (*MultiPoint) Swap ¶
func (g *MultiPoint) Swap(g2 *MultiPoint)
Swap swaps the values of g and g2.
type MultiPolygon ¶
type MultiPolygon struct {
// contains filtered or unexported fields
}
A MultiPolygon is a collection of Polygons.
func NewMultiPolygon ¶
func NewMultiPolygon(layout Layout) *MultiPolygon
NewMultiPolygon returns a new MultiPolygon with no Polygons.
func NewMultiPolygonFlat ¶
func NewMultiPolygonFlat(layout Layout, flatCoords []float64, endss [][]int) *MultiPolygon
NewMultiPolygonFlat returns a new MultiPolygon with the given flat coordinates.
func (*MultiPolygon) Area ¶
func (g *MultiPolygon) Area() float64
Area returns the sum of the area of the individual Polygons.
func (*MultiPolygon) Clone ¶
func (g *MultiPolygon) Clone() *MultiPolygon
Clone returns a deep copy.
func (*MultiPolygon) Coords ¶
func (g *MultiPolygon) Coords() [][][]Coord
Coords returns all the coordinates in g.
func (*MultiPolygon) Endss ¶
func (g *MultiPolygon) Endss() [][]int
Endss returns a list of all the sub-sub-structures in g.
func (*MultiPolygon) Length ¶
func (g *MultiPolygon) Length() float64
Length returns the sum of the perimeters of the Polygons.
func (*MultiPolygon) MustSetCoords ¶
func (g *MultiPolygon) MustSetCoords(coords [][][]Coord) *MultiPolygon
MustSetCoords sets the coordinates and panics on any error.
func (*MultiPolygon) NumPolygons ¶
func (g *MultiPolygon) NumPolygons() int
NumPolygons returns the number of Polygons.
func (*MultiPolygon) Polygon ¶
func (g *MultiPolygon) Polygon(i int) *Polygon
Polygon returns the ith Polygon.
func (*MultiPolygon) Reverse ¶
func (g *MultiPolygon) Reverse()
Reverse reverses the order of coordinates for each sub-sub-structure in g.
func (*MultiPolygon) SetCoords ¶
func (g *MultiPolygon) SetCoords(coords [][][]Coord) (*MultiPolygon, error)
SetCoords sets the coordinates.
func (*MultiPolygon) SetSRID ¶
func (g *MultiPolygon) SetSRID(srid int) *MultiPolygon
SetSRID sets the SRID of g.
func (*MultiPolygon) Swap ¶
func (g *MultiPolygon) Swap(g2 *MultiPolygon)
Swap swaps the values of g and g2.
type NewMultiPointFlatOption ¶
type NewMultiPointFlatOption func(*MultiPoint)
NewMultiPointFlatOption represents an option that can be passed into NewMultiPointFlat.
func NewMultiPointFlatOptionWithEnds ¶
func NewMultiPointFlatOptionWithEnds(ends []int) NewMultiPointFlatOption
NewMultiPointFlatOptionWithEnds allows passing ends to NewMultiPointFlat, which allows the representation of empty points.
type Point ¶
type Point struct {
Geom0
}
A Point represents a single point.
func NewPointEmpty ¶
NewPointEmpty allocates a new Point with no coordinates.
func NewPointFlat ¶
NewPointFlat allocates a new Point with layout l and flat coordinates FlatCoordinates.
func NewPointFlatMaybeEmpty ¶
NewPointFlatMaybeEmpty returns a new point, checking whether the point may be empty by checking wther all the points are NaN.
func (*Point) MustSetCoords ¶
MustSetCoords is like SetCoords but panics on any error.
type Polygon ¶
type Polygon struct {
// contains filtered or unexported fields
}
A Polygon represents a polygon as a collection of LinearRings. The first LinearRing is the outer boundary. Subsequent LinearRings are inner boundaries (holes).
func NewPolygon ¶
NewPolygon returns a new, empty, Polygon.
Example ¶
unitSquare := NewPolygon(XY).MustSetCoords([][]Coord{ {{0, 0}, {1, 0}, {1, 1}, {0, 1}, {0, 0}}, }) fmt.Printf("unitSquare.Area() == %f", unitSquare.Area())
Output: unitSquare.Area() == 1.000000
func NewPolygonFlat ¶
NewPolygonFlat returns a new Polygon with the given flat coordinates.
func (*Polygon) Coords ¶
func (g *Polygon) Coords() [][]Coord
Coords returns all of g's coordinates.
func (*Polygon) Ends ¶
func (g *Polygon) Ends() []int
Ends returns the end indexes of all sub-structures in g.
func (*Polygon) LinearRing ¶
func (g *Polygon) LinearRing(i int) *LinearRing
LinearRing returns the ith LinearRing.
func (*Polygon) MustSetCoords ¶
MustSetCoords sets the coordinates and panics on any error.
func (*Polygon) NumLinearRings ¶
NumLinearRings returns the number of LinearRings.
func (*Polygon) Reverse ¶
func (g *Polygon) Reverse()
Reverse reverses the order of coordinates for each sub-structure in g.
type T ¶
type T interface { Layout() Layout Stride() int Bounds() *Bounds FlatCoords() []float64 Ends() []int Endss() [][]int SRID() int Empty() bool }
T is a generic interface implemented by all geometry types.
func TransformInPlace ¶
TransformInPlace replaces all coordinates in g using f.
Source Files ¶
Directories ¶
Path | Synopsis |
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Package bigxy contains robust geographic functions on planar (xy) data.
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Package bigxy contains robust geographic functions on planar (xy) data. |
encoding
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ewkb
Package ewkb implements Extended Well Known Binary encoding and decoding.
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Package ewkb implements Extended Well Known Binary encoding and decoding. |
ewkbhex
Package ewkbhex implements Extended Well Known Binary encoding and decoding of strings.
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Package ewkbhex implements Extended Well Known Binary encoding and decoding of strings. |
geojson
Package geojson implements GeoJSON encoding and decoding.
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Package geojson implements GeoJSON encoding and decoding. |
igc
Package igc implements an IGC parser.
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Package igc implements an IGC parser. |
kml
Package kml implements KML encoding.
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Package kml implements KML encoding. |
wkb
Package wkb implements Well Known Binary encoding and decoding.
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Package wkb implements Well Known Binary encoding and decoding. |
wkbcommon
Package wkbcommon contains code common to WKB and EWKB encoding.
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Package wkbcommon contains code common to WKB and EWKB encoding. |
wkbhex
Package wkbhex implements Well Known Binary encoding and decoding of strings.
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Package wkbhex implements Well Known Binary encoding and decoding of strings. |
wkt
Package wkt implements Well Known Text encoding and decoding.
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Package wkt implements Well Known Text encoding and decoding. |
examples
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internal
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cmd/parse-igc
parse-igc parsers all IGC files passed on the command line and prints any errors encountered.
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parse-igc parsers all IGC files passed on the command line and prints any errors encountered. |
Package xy contains low-level planar (xy) geographic functions.
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Package xy contains low-level planar (xy) geographic functions. |
internal/robustdeterminate
Package robustdeterminate implements an algorithm to compute the sign of a 2x2 determinant for double precision values robustly.
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Package robustdeterminate implements an algorithm to compute the sign of a 2x2 determinant for double precision values robustly. |
Package xyz contains operations in 3d coordinate space.
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Package xyz contains operations in 3d coordinate space. |