cmd: send group

internal/util/map.go

@@ -0,0 +1,16 @@
+package util
+
+import "math"
+
+func ShortDistance(w, h uint32, x1, y1, x2, y2 float64) float64 {
+	dx := math.Abs(x2 - x1)
+	dy := math.Abs(y2 - y1)
+	if dx > float64(w/2) {
+		dx = float64(h) - dx
+	}
+	if dy > float64(h/2) {
+		dy = float64(h) - dy
+	}
+	return math.Sqrt(math.Pow(dx, 2) + math.Pow(dy, 2))
+
+}

internal/util/map_test.go

@@ -0,0 +1,27 @@
+package util_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/iliadenisov/galaxy/internal/number"
+	"github.com/iliadenisov/galaxy/internal/util"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestShortDistance(t *testing.T) {
+	for i, tc := range []struct {
+		w, h              uint32
+		x1, y1, x2, y2, d float64
+	}{
+		{10, 10, 0, 0, 5, 5, 7.071},
+		{10, 10, 0, 0, 5.01, 5.01, 7.057},
+		{10, 10, 2, 2, 8, 2, 4.},
+		{10, 10, 8, 7, 1, 7, 3.},
+	} {
+		t.Run(fmt.Sprint(i), func(t *testing.T) {
+			d := util.ShortDistance(tc.w, tc.h, tc.x1, tc.y1, tc.x2, tc.y2)
+			assert.Equal(t, tc.d, number.Fixed3(d))
+		})
+	}
+}