mirror of
https://github.com/go-gitea/gitea
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38
vendor/github.com/blevesearch/bleve/geo/geo.go
generated
vendored
38
vendor/github.com/blevesearch/bleve/geo/geo.go
generated
vendored
@ -37,6 +37,12 @@ var geoTolerance = 1E-6
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var lonScale = float64((uint64(0x1)<<GeoBits)-1) / 360.0
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var latScale = float64((uint64(0x1)<<GeoBits)-1) / 180.0
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// Point represents a geo point.
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type Point struct {
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Lon float64
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Lat float64
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}
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// MortonHash computes the morton hash value for the provided geo point
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// This point is ordered as lon, lat.
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func MortonHash(lon, lat float64) uint64 {
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@ -168,3 +174,35 @@ func checkLongitude(longitude float64) error {
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}
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return nil
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}
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func BoundingRectangleForPolygon(polygon []Point) (
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float64, float64, float64, float64, error) {
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err := checkLongitude(polygon[0].Lon)
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if err != nil {
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return 0, 0, 0, 0, err
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}
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err = checkLatitude(polygon[0].Lat)
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if err != nil {
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return 0, 0, 0, 0, err
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}
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maxY, minY := polygon[0].Lat, polygon[0].Lat
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maxX, minX := polygon[0].Lon, polygon[0].Lon
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for i := 1; i < len(polygon); i++ {
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err := checkLongitude(polygon[i].Lon)
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if err != nil {
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return 0, 0, 0, 0, err
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}
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err = checkLatitude(polygon[i].Lat)
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if err != nil {
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return 0, 0, 0, 0, err
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}
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maxY = math.Max(maxY, polygon[i].Lat)
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minY = math.Min(minY, polygon[i].Lat)
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maxX = math.Max(maxX, polygon[i].Lon)
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minX = math.Min(minX, polygon[i].Lon)
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}
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return minX, maxY, maxX, minY, nil
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}
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