From 40d85508b390426910b7ec5ef66c0953ec7d01a2 Mon Sep 17 00:00:00 2001
From: cha0s <git@cha0s.io>
Date: Tue, 20 Apr 2021 06:26:13 -0500
Subject: [PATCH] fix: radians -> angle

---
 packages/math/src/math.js  | 2 +-
 packages/math/test/math.js | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/math/src/math.js b/packages/math/src/math.js
index a69ace8..1577fd2 100644
--- a/packages/math/src/math.js
+++ b/packages/math/src/math.js
@@ -52,7 +52,7 @@ export const add = (l, r) => l + r;
 export const div = (l, r) => l / r;
 export const frac = (number) => number % 1;
 export const angleFromRad = (r) => (
-  (360 + ((2 * Math.PI - (r + HALF_PI)) % (Math.PI * 2)) / -PI_180) % 360
+  (360 + ((2 * Math.PI - ((Math.PI - r) + HALF_PI + Math.PI)) % (Math.PI * 2)) / -PI_180) % 360
 );
 export const angleRange = (angle, delta) => ({
   min: 360 + (angle - delta),
diff --git a/packages/math/test/math.js b/packages/math/test/math.js
index 019c04e..51ea336 100644
--- a/packages/math/test/math.js
+++ b/packages/math/test/math.js
@@ -4,8 +4,8 @@ import {angleFromRad, HALF_PI, PI} from '../src/math';
 
 it('can translate radians into degrees', () => {
   expect(angleFromRad(0)).to.equal(90);
-  expect(angleFromRad(HALF_PI)).to.equal(180);
+  expect(angleFromRad(HALF_PI)).to.equal(0);
   expect(angleFromRad(PI)).to.equal(270);
-  expect(angleFromRad(PI + HALF_PI)).to.equal(0);
+  expect(angleFromRad(PI + HALF_PI)).to.equal(180);
   expect(angleFromRad(2 * PI)).to.equal(90);
 });