mirror of https://github.com/tidwall/tile38.git
132 lines
3.7 KiB
Go
132 lines
3.7 KiB
Go
package geojson
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import (
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"github.com/tidwall/tile38/geojson/geo"
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"github.com/tidwall/tile38/geojson/geohash"
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"github.com/tidwall/tile38/geojson/poly"
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)
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// SimplePoint is a geojson object with the type "Point" and where there coordinate is 2D and there is no bbox.
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type SimplePoint struct {
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X, Y float64
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}
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// New2DPoint creates a SimplePoint
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func New2DPoint(x, y float64) SimplePoint {
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return SimplePoint{x, y}
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}
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func fillSimplePoint(coordinates Position, bbox *BBox, err error) (SimplePoint, error) {
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return SimplePoint{X: coordinates.X, Y: coordinates.Y}, err
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}
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// CalculatedBBox is exterior bbox containing the object.
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func (g SimplePoint) CalculatedBBox() BBox {
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return BBox{
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Min: Position{X: g.X, Y: g.Y, Z: 0},
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Max: Position{X: g.X, Y: g.Y, Z: 0},
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}
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}
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// CalculatedPoint is a point representation of the object.
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func (g SimplePoint) CalculatedPoint() Position {
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return Position{X: g.X, Y: g.Y, Z: 0}
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}
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// Geohash converts the object to a geohash value.
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func (g SimplePoint) Geohash(precision int) (string, error) {
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p := g.CalculatedPoint()
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return geohash.Encode(p.Y, p.X, precision)
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}
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// PositionCount return the number of coordinates.
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func (g SimplePoint) PositionCount() int {
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return 1
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}
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// Weight returns the in-memory size of the object.
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func (g SimplePoint) Weight() int {
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return 2 * 8
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}
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// MarshalJSON allows the object to be encoded in json.Marshal calls.
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func (g SimplePoint) MarshalJSON() ([]byte, error) {
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return []byte(g.JSON()), nil
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}
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// JSON is the json representation of the object. This might not be exactly the same as the original.
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func (g SimplePoint) JSON() string {
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return level1JSON("Point", Position{X: g.X, Y: g.Y, Z: 0}, nil)
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}
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// String returns a string representation of the object. This might be JSON or something else.
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func (g SimplePoint) String() string {
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return g.JSON()
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}
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func (g SimplePoint) bboxPtr() *BBox {
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return nil
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}
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func (g SimplePoint) hasPositions() bool {
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return true
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}
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// WithinBBox detects if the object is fully contained inside a bbox.
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func (g SimplePoint) WithinBBox(bbox BBox) bool {
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return poly.Point(Position{X: g.X, Y: g.Y, Z: 0}).InsideRect(rectBBox(bbox))
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}
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// IntersectsBBox detects if the object intersects a bbox.
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func (g SimplePoint) IntersectsBBox(bbox BBox) bool {
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return poly.Point(Position{X: g.X, Y: g.Y, Z: 0}).InsideRect(rectBBox(bbox))
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}
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// Within detects if the object is fully contained inside another object.
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func (g SimplePoint) Within(o Object) bool {
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return withinObjectShared(g, o,
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func(v Polygon) bool {
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return poly.Point(Position{X: g.X, Y: g.Y, Z: 0}).Inside(polyExteriorHoles(v.Coordinates))
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},
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func(v MultiPolygon) bool {
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for _, c := range v.Coordinates {
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if !poly.Point(Position{X: g.X, Y: g.Y, Z: 0}).Inside(polyExteriorHoles(c)) {
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return false
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}
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}
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return true
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},
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)
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}
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// Intersects detects if the object intersects another object.
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func (g SimplePoint) Intersects(o Object) bool {
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return intersectsObjectShared(g, o,
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func(v Polygon) bool {
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return poly.Point(Position{X: g.X, Y: g.Y, Z: 0}).Intersects(polyExteriorHoles(v.Coordinates))
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},
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func(v MultiPolygon) bool {
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for _, c := range v.Coordinates {
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if poly.Point(Position{X: g.X, Y: g.Y, Z: 0}).Intersects(polyExteriorHoles(c)) {
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return true
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}
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}
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return false
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},
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)
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}
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// Nearby detects if the object is nearby a position.
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func (g SimplePoint) Nearby(center Position, meters float64) bool {
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return geo.DistanceTo(center.Y, center.X, g.Y, g.X) <= meters
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}
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// IsBBoxDefined returns true if the object has a defined bbox.
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func (g SimplePoint) IsBBoxDefined() bool {
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return false
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}
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// IsGeometry return true if the object is a geojson geometry object. false if it something else.
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func (g SimplePoint) IsGeometry() bool {
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return true
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}
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