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package orb
// EarthRadius is the radius of the earth in meters. It is used in geo distance calculations.
// To keep things consistent, this value matches WGS84 Web Mercator (EPSG:3857).
const EarthRadius = 6378137.0 // meters
// DefaultRoundingFactor is the default rounding factor used by the Round func.
var DefaultRoundingFactor = 1e6 // 6 decimal places
// Orientation defines the order of the points in a polygon
// or closed ring.
type Orientation int8
// Constants to define orientation.
// They follow the right hand rule for orientation.
const (
// CCW stands for Counter Clock Wise
CCW Orientation = 1
// CW stands for Clock Wise
CW Orientation = -1
)
// A DistanceFunc is a function that computes the distance between two points.
type DistanceFunc func(Point, Point) float64
// A Projection a function that moves a point from one space to another.
type Projection func(Point) Point
// Pointer is something that can be represented by a point.
type Pointer interface {
Point() Point
}
// A Simplifier is something that can simplify geometry.
type Simplifier interface {
Simplify(g Geometry) Geometry
LineString(ls LineString) LineString
MultiLineString(mls MultiLineString) MultiLineString
Ring(r Ring) Ring
Polygon(p Polygon) Polygon
MultiPolygon(mp MultiPolygon) MultiPolygon
Collection(c Collection) Collection
}
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