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package orb
import (
"fmt"
"math"
)
// Round will round all the coordinates of the geometry to the given factor.
// The default is 6 decimal places.
func Round(g Geometry, factor ...int) Geometry {
if g == nil {
return nil
}
f := float64(DefaultRoundingFactor)
if len(factor) > 0 {
f = float64(factor[0])
}
switch g := g.(type) {
case Point:
return Point{
math.Round(g[0]*f) / f,
math.Round(g[1]*f) / f,
}
case MultiPoint:
if g == nil {
return nil
}
roundPoints([]Point(g), f)
return g
case LineString:
if g == nil {
return nil
}
roundPoints([]Point(g), f)
return g
case MultiLineString:
if g == nil {
return nil
}
for _, ls := range g {
roundPoints([]Point(ls), f)
}
return g
case Ring:
if g == nil {
return nil
}
roundPoints([]Point(g), f)
return g
case Polygon:
if g == nil {
return nil
}
for _, r := range g {
roundPoints([]Point(r), f)
}
return g
case MultiPolygon:
if g == nil {
return nil
}
for _, p := range g {
for _, r := range p {
roundPoints([]Point(r), f)
}
}
return g
case Collection:
if g == nil {
return nil
}
for i := range g {
g[i] = Round(g[i], int(f))
}
return g
case Bound:
return Bound{
Min: Point{
math.Round(g.Min[0]*f) / f,
math.Round(g.Min[1]*f) / f,
},
Max: Point{
math.Round(g.Max[0]*f) / f,
math.Round(g.Max[1]*f) / f,
},
}
}
panic(fmt.Sprintf("geometry type not supported: %T", g))
}
func roundPoints(ps []Point, f float64) {
for i := range ps {
ps[i][0] = math.Round(ps[i][0]*f) / f
ps[i][1] = math.Round(ps[i][1]*f) / f
}
}
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