Added MapFloatBetween util-function

pkg/utils.go

@@ -15,3 +15,11 @@ func check(err error) {
 		log.Fatal(err)
 	}
 }
+
+type Numeric interface {
+	float64
+}
+
+func MapFloatBetween[T Numeric](value, start1, stop1, start2, stop2 T) T {
+	return start2 + (value-start1)*(stop2-start2)/(stop1-start1)
+}

pkg/utils_test.go

@@ -0,0 +1,14 @@
+package gomus_test
+
+import (
+	"testing"
+
+	gomus "git.cesium.pw/niku/gomus/pkg"
+)
+
+func TestMapBetween(t *testing.T) {
+	r := gomus.MapFloatBetween(2, 1, 3, 5, 10)
+	if r != 7.5 {
+		t.Fatalf("Expected value to be mapped to #, got: %f", r)
+	}
+}