From e1403bd7cac76b59f5bb8089e872711a4865f2d3 Mon Sep 17 00:00:00 2001
From: Antti Tikka <antti.tikka@hotmail.com>
Date: Sat, 5 Sep 2020 19:22:02 +0300
Subject: [PATCH] Fix Align Island by Edge only working in Blender 2.83

---
 op_island_align_edge.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/op_island_align_edge.py b/op_island_align_edge.py
index b15eee7..1e6c7ad 100644
--- a/op_island_align_edge.py
+++ b/op_island_align_edge.py
@@ -126,9 +126,14 @@ def align_island(uv_vert0, uv_vert1, faces):
 			loop[uv_layers].select = True
 
 	diff = uv_vert1 - uv_vert0
-	current_angle = math.atan2(diff.y, diff.x)
+	current_angle = math.atan2(diff.x, diff.y)
 	angle_to_rotate = round(current_angle / (math.pi/2)) * (math.pi/2) - current_angle
 
+	# For some reason bpy.ops.transform.rotate rotates in the opposite
+	# direction in Blender 2.83 than in other versions.
+	if float(bpy.app.version_string[0:4]) == 2.83:
+		angle_to_rotate = -angle_to_rotate
+
 	bpy.ops.uv.select_linked()
 
 	bpy.context.tool_settings.transform_pivot_point = 'CURSOR'