From 3a448dc362215bc992123d03162a6df435c78072 Mon Sep 17 00:00:00 2001
From: Leon Sorokin <leeoniya@gmail.com>
Date: Mon, 8 Jul 2024 14:42:44 -0500
Subject: [PATCH] fix wind direction math. close #970.

---
 demos/wind-direction.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/demos/wind-direction.html b/demos/wind-direction.html
index 41dabb91..6d689d4c 100644
--- a/demos/wind-direction.html
+++ b/demos/wind-direction.html
@@ -79,7 +79,7 @@
 							let yPx = u.valToPos(speeds[i], 'y2', true);
 
 							let len = 15;
-							let theta = dirs[i] * (Math.PI / 180);
+							let theta = (dirs[i] - 90) * (Math.PI / 180);
 							let dx = len * Math.cos(theta);
 							let dy = len * Math.sin(theta);