From 5cab7e946071f447bf2626339d6be3dcf28dddcc Mon Sep 17 00:00:00 2001
From: Nathan Sweet <nathan.sweet@gmail.com>
Date: Wed, 3 Jun 2020 15:47:46 +0200
Subject: [PATCH] Fixed 1-bone IK for transform mode noRotationOrReflection
 when skeleton scale is applied.

---
 .../src/com/esotericsoftware/spine/IkConstraint.java   | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
index f3402a0f0..82fb4e5b1 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
@@ -185,10 +185,12 @@ public class IkConstraint implements Updatable {
 			ty = targetY - bone.worldY;
 			break;
 		case noRotationOrReflection:
-			rotationIK += atan2(pc, pa) * radDeg;
-			float ps = Math.abs(pa * pd - pb * pc) / (pa * pa + pc * pc);
-			pb = -pc * ps;
-			pd = pa * ps;
+			float s = Math.abs(pa * pd - pb * pc) / (pa * pa + pc * pc);
+			float sa = pa / bone.skeleton.scaleX;
+			float sc = pc / bone.skeleton.scaleY;
+			pb = -sc * s * bone.skeleton.scaleX;
+			pd = sa * s * bone.skeleton.scaleY;
+			rotationIK += atan2(sc, sa) * radDeg;
 			// Fall through.
 		default:
 			float x = targetX - p.worldX, y = targetY - p.worldY;