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feat(server): add geocondig api to govpolygon
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package govpolygon | ||
|
|
||
| import ( | ||
| "github.com/JamesLMilner/quadtree-go" | ||
| geojson "github.com/paulmach/go.geojson" | ||
| ) | ||
|
|
||
| type Quadtree struct { | ||
| qt *quadtree.Quadtree | ||
| ft map[quadtree.Bounds]string | ||
| } | ||
|
|
||
| func NewQuadtree(f []*geojson.Feature) *Quadtree { | ||
| ft := map[quadtree.Bounds]string{} | ||
| qt := &quadtree.Quadtree{ | ||
| MaxObjects: 10, | ||
| MaxLevels: 100, | ||
| Objects: make([]quadtree.Bounds, 0), | ||
| Nodes: make([]quadtree.Quadtree, 0), | ||
| } | ||
|
|
||
| for _, f := range f { | ||
| b, ok := bounds(f.Geometry) | ||
| if !ok { | ||
| continue | ||
| } | ||
|
|
||
| qt.Insert(b) | ||
| ft[b] = f.Properties["code"].(string) | ||
| } | ||
|
|
||
| return &Quadtree{ | ||
| qt: qt, | ||
| ft: ft, | ||
| } | ||
| } | ||
|
|
||
| func (q *Quadtree) Find(lng, lat float64) (string, bool) { | ||
| res := q.qt.RetrieveIntersections(quadtree.Bounds{ | ||
| X: lng, | ||
| Y: lat, | ||
| }) | ||
| if len(res) == 0 { | ||
| return "", false | ||
| } | ||
|
|
||
| r, ok := q.ft[res[0]] | ||
| return r, ok | ||
| } | ||
|
|
||
| func bounds(g *geojson.Geometry) (b quadtree.Bounds, _ bool) { | ||
| if !g.IsMultiPolygon() && !g.IsPolygon() { | ||
| return | ||
| } | ||
|
|
||
| if g.IsPolygon() { | ||
| g = &geojson.Geometry{ | ||
| Type: "MultiPolygon", | ||
| MultiPolygon: [][][][]float64{g.Polygon}, | ||
| } | ||
| } | ||
|
|
||
| minlat := -1.0 | ||
| minlng := -1.0 | ||
| maxlat := -1.0 | ||
| maxlng := -1.0 | ||
|
|
||
| for _, polygon := range g.MultiPolygon { | ||
| for _, ring := range polygon { | ||
| for _, p := range ring { | ||
| lng := p[0] | ||
| lat := p[1] | ||
|
|
||
| if minlat == -1 || lat < minlat { | ||
| minlat = lat | ||
| } | ||
| if minlng == -1 || lng < minlng { | ||
| minlng = lng | ||
| } | ||
|
|
||
| if maxlat == -1 || lat > maxlat { | ||
| maxlat = lat | ||
| } | ||
| if maxlng == -1 || lng > maxlng { | ||
| maxlng = lng | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return quadtree.Bounds{ | ||
| X: minlng, | ||
| Y: minlat, | ||
| Width: maxlng - minlng, | ||
| Height: maxlat - minlat, | ||
| }, true | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| package govpolygon | ||
|
|
||
| import ( | ||
| "context" | ||
| "path/filepath" | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func TestQuadtree(t *testing.T) { | ||
| p := NewProcessor(filepath.Join(dirpath, "japan_city.geojson")) | ||
| ctx := context.Background() | ||
| f, _, err := p.ComputeGeoJSON(ctx, nil) | ||
| assert.NoError(t, err) | ||
|
|
||
| q := NewQuadtree(f.Features) | ||
| res, ok := q.Find(139.760296, 35.686067) | ||
| assert.True(t, ok) | ||
| assert.Equal(t, "13101", res) | ||
| } | ||
|
|
||
| func BenchmarkQuadtree(b *testing.B) { | ||
| p := NewProcessor(filepath.Join(dirpath, "japan_city.geojson")) | ||
| ctx := context.Background() | ||
| f, _, _ := p.ComputeGeoJSON(ctx, nil) | ||
| q := NewQuadtree(f.Features) | ||
|
|
||
| b.ResetTimer() | ||
| for i := 0; i < b.N; i++ { | ||
| _, _ = q.Find(139.760296, 35.686067) | ||
| } | ||
| } |