Added Abs{,32}.

math.go

@@ -2,6 +2,16 @@ package geom
 
 import "math"
 
+// Abs returns the absolute value.
+func Abs(f float64) float64 {
+	return math.Abs(f)
+}
+
+// Abs32 returns the absolute value.
+func Abs32(f float32) float32 {
+	return float32(Abs(float64(f)))
+}
+
 // IsNaN checks if the floating point number is not a number.
 func IsNaN(f float64) bool {
 	return f != f