poly

Documentation

Index

• type Polygon
  • func New(coordinates string) (Polygon, error)
  • func NewFromPoints(points []*xmlquery.Node) (Polygon, error)
  • func (p Polygon) BoundingRectangle() image.Rectangle
  • func (p Polygon) Inside(point image.Point) bool
  • func (p Polygon) String() string

Types

type Polygon

type Polygon []image.Point

Polygon defines a list of closed points that define a polygon.

func New

func New(coordinates string) (Polygon, error)

New creates a new polygon from a whitespace separated list of comma separated coordinates e.g. `1,2 3,4 5,6`. A polygon contains at least 3 points.

func NewFromPoints

func NewFromPoints(points []*xmlquery.Node) (Polygon, error)

NewFromPoints from a node list of `<Point x="1" y="2"/>` entities.

func (Polygon) BoundingRectangle

func (p Polygon) BoundingRectangle() image.Rectangle

BoundingRectangle returns the minimal rectangle containing all of the polygon's points.

func (Polygon) Inside

func (p Polygon) Inside(point image.Point) bool

Inside returns true if the given point lies within the polygon. Implementation: https://stackoverflow.com/questions/217578/how-can-i-determine-whether-a-2d-point-is-within-a-polygon

func (Polygon) String

func (p Polygon) String() string