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vendor/github.com/paulmach/orb/planar/README.md

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+# orb/planar [![Godoc Reference](https://pkg.go.dev/badge/github.com/paulmach/orb)](https://pkg.go.dev/github.com/paulmach/orb/planar)
+
+The geometries defined in the `orb` package are generic 2d geometries.
+Depending on what projection they're in, e.g. lon/lat or flat on the plane,
+area and distance calculations are different. This package implements methods
+that assume the planar or Euclidean context.
+
+## Examples
+
+Area of 3-4-5 triangle:
+
+```go
+r := orb.Ring{{0, 0}, {3, 0}, {0, 4}, {0, 0}}
+a := planar.Area(r)
+
+fmt.Println(a)
+// Output:
+// 6
+```
+
+Distance between two points:
+
+```go
+d := planar.Distance(orb.Point{0, 0}, orb.Point{3, 4})
+
+fmt.Println(d)
+// Output:
+// 5
+```
+
+Length/circumference of a 3-4-5 triangle:
+
+```go
+r := orb.Ring{{0, 0}, {3, 0}, {0, 4}, {0, 0}}
+l := planar.Length(r)
+
+fmt.Println(l)
+// Output:
+// 12
+```