41 lines
859 B
Go
41 lines
859 B
Go
package geo
|
|
|
|
import "math"
|
|
|
|
func EuclideanDistance(x1, y1, x2, y2 float64) float64 {
|
|
if x1 == x2 {
|
|
return math.Abs(y1 - y2)
|
|
} else if y1 == y2 {
|
|
return math.Abs(x1 - x2)
|
|
} else {
|
|
return math.Sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2))
|
|
}
|
|
}
|
|
|
|
// compare a and b and consider them equal if
|
|
// difference is less than precision e (e.g. e=0.001)
|
|
func PrecisionCompare(a, b, e float64) int {
|
|
if math.Abs(a-b) < e {
|
|
return 0
|
|
}
|
|
if a < b {
|
|
return -1
|
|
}
|
|
return 1
|
|
}
|
|
|
|
// TruncateDecimals truncates floats to keep up to 3 digits after decimal, to avoid issues with floats on different machines.
|
|
// Since we're not launching rockets, 3 decimals is enough precision for what we're doing
|
|
func TruncateDecimals(v float64) float64 {
|
|
return float64(int(v*1000)) / 1000
|
|
}
|
|
|
|
func Sign(i float64) int {
|
|
if i < 0 {
|
|
return -1
|
|
}
|
|
if i > 0 {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|