From 46cb953c36dc109ca0089dd10babbaf7ee290cae Mon Sep 17 00:00:00 2001
From: Chewxy <chewxy@gmail.com>
Date: Fri, 2 Jul 2021 09:17:39 +1000
Subject: [PATCH] Fixed #21 (#22)
---
atan2.go | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/atan2.go b/atan2.go
index 3da4f6d..a1990ca 100644
--- a/atan2.go
+++ b/atan2.go
@@ -2,6 +2,25 @@ package math32
import "math"
-func Atan2(x, y float32) float32 {
- return float32(math.Atan2(float64(x), float64(y)))
+// Atan2 returns the arc tangent of y/x, using the signs of the two to determine the quadrant of the return value.
+// Special cases are (in order):
+// Atan2(y, NaN) = NaN
+// Atan2(NaN, x) = NaN
+// Atan2(+0, x>=0) = +0
+// Atan2(-0, x>=0) = -0
+// Atan2(+0, x<=-0) = +Pi
+// Atan2(-0, x<=-0) = -Pi
+// Atan2(y>0, 0) = +Pi/2
+// Atan2(y<0, 0) = -Pi/2
+// Atan2(+Inf, +Inf) = +Pi/4
+// Atan2(-Inf, +Inf) = -Pi/4
+// Atan2(+Inf, -Inf) = 3Pi/4
+// Atan2(-Inf, -Inf) = -3Pi/4
+// Atan2(y, +Inf) = 0
+// Atan2(y>0, -Inf) = +Pi
+// Atan2(y<0, -Inf) = -Pi
+// Atan2(+Inf, x) = +Pi/2
+// Atan2(-Inf, x) = -Pi/2
+func Atan2(y, x float32) float32 {
+ return float32(math.Atan2(float64(y), float64(x)))
}
--
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