test dw distances

pkg/generator/map.go

@@ -2,6 +2,7 @@ package generator
 
 import (
 	"fmt"
+	"math"
 	"math/rand"
 
 	"github.com/iliadenisov/galaxy/pkg/generator/plotter"
@@ -67,6 +68,18 @@ func (m Map) NewCoordinate(deadZoneRaduis float64) (Coordinate, error) {
 	}
 }
 
+func (m Map) ShortDistance(from, to Coordinate) float64 {
+	dx := math.Abs(to.X - from.X)
+	dy := math.Abs(to.Y - from.Y)
+	if dx > float64(m.Width/2) {
+		dx = float64(m.Width) - dx
+	}
+	if dy > float64(m.Height/2) {
+		dy = float64(m.Height) - dy
+	}
+	return math.Sqrt(math.Pow(dx, 2) + math.Pow(dy, 2))
+}
+
 func NewPlanet(c Coordinate, size, resources float64) Planet {
 	return Planet{
 		Position:  c,