From 251b368cbfccfbe71a644e148f54978ad35eca0b Mon Sep 17 00:00:00 2001
From: Nathan Sweet <>
Date: Mon, 6 Nov 2023 17:50:00 -0400
Subject: [PATCH] [libgdx] Physics scale fixes.

---
 .../spine/PhysicsConstraint.java              | 113 +++++-------------
 1 file changed, 30 insertions(+), 83 deletions(-)

diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
index ee00a916e..ade16d407 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/PhysicsConstraint.java
@@ -154,12 +154,12 @@ public class PhysicsConstraint implements Updatable {
 						r = rotateOffset * mix + ca;
 						c = cos(r);
 						s = sin(r);
-						if (scaleX) scaleOffset += (dx * c + dy * s) * i / l;
+						if (scaleX) scaleOffset += (dx * c + dy * s) * i / l / bone.getWorldScaleX();
 					} else if (scaleX) {
-						float r = rotateOffset * mix + atan2(bone.c, bone.a);
+						float r = atan2(bone.c, bone.a);
 						c = cos(r);
 						s = sin(r);
-						scaleOffset += ((cx - bone.worldX) * c + (cy - bone.worldY) * s) * i / l;
+						scaleOffset += ((cx - bone.worldX) * c + (cy - bone.worldY) * s) * i / l / bone.getWorldScaleX();
 					}
 				}
 				cx = bone.worldX;
@@ -202,93 +202,40 @@ public class PhysicsConstraint implements Updatable {
 			if (y) bone.worldY += yOffset * mix;
 		}
 
-		// Smoothing.
-		if (physics != Physics.none && false) {
-			float a = (Math.min(remaining / data.step, 1) - 1) * mix;
-			if (rotateOrShearX) {
-				float rotateOffset = rotateVelocityLast * a;
-				float r = rotateOffset * mix, ra = bone.a, sin, cos;
-				if (data.rotate) {
-					if (data.shearX) {
-						r *= 0.5f;
-						sin = sin(r);
-						cos = cos(r);
-						bone.a = cos * ra - sin * bone.c;
-						bone.c = sin * ra + cos * bone.c;
-						ra = bone.a;
-					} else {
-						sin = sin(r);
-						cos = cos(r);
-					}
-					float rb = bone.b;
-					bone.b = cos * rb - sin * bone.d;
-					bone.d = sin * rb + cos * bone.d;
+		if (rotateOrShearX) {
+			float r = rotateOffset * mix, ra = bone.a, sin, cos;
+			if (data.rotate) {
+				if (data.shearX) {
+					r *= 0.5f;
+					sin = sin(r);
+					cos = cos(r);
+					bone.a = cos * ra - sin * bone.c;
+					bone.c = sin * ra + cos * bone.c;
+					ra = bone.a;
 				} else {
 					sin = sin(r);
 					cos = cos(r);
 				}
-				bone.a = cos * ra - sin * bone.c;
-				bone.c = sin * ra + cos * bone.c;
-			}
-			if (scaleX) {
+				float rb = bone.b;
+				bone.b = cos * rb - sin * bone.d;
+				bone.d = sin * rb + cos * bone.d;
+			} else {
+				sin = sin(r);
+				cos = cos(r);
 			}
+			bone.a = cos * ra - sin * bone.c;
+			bone.c = sin * ra + cos * bone.c;
 		}
-
-		if (false) {
-			// Local.
-			if (rotateOrShearX) {
-				float r = bone.worldToLocalRotation((atan2(bone.c, bone.a) + rotateOffset * mix) * radDeg) - bone.arotation;
-				if (data.rotate) {
-					if (data.shearX) {
-						r *= 0.5f;
-						bone.ashearX += r;
-					}
-					bone.arotation += r;
-				} else
-					bone.ashearX += r;
-			}
-			if (scaleX) bone.ascaleX *= 1 + scaleOffset * mix;
-			bone.update(null);
-			if (physics == Physics.update) {
-				tx = l * bone.a;
-				ty = l * bone.c;
-			}
-		} else {
-			if (rotateOrShearX) {
-				float r = rotateOffset * mix, ra = bone.a, sin, cos;
-				if (data.rotate) {
-					if (data.shearX) {
-						r *= 0.5f;
-						sin = sin(r);
-						cos = cos(r);
-						bone.a = cos * ra - sin * bone.c;
-						bone.c = sin * ra + cos * bone.c;
-						ra = bone.a;
-					} else {
-						sin = sin(r);
-						cos = cos(r);
-					}
-					float rb = bone.b;
-					bone.b = cos * rb - sin * bone.d;
-					bone.d = sin * rb + cos * bone.d;
-				} else {
-					sin = sin(r);
-					cos = cos(r);
-				}
-				bone.a = cos * ra - sin * bone.c;
-				bone.c = sin * ra + cos * bone.c;
-			}
-			if (scaleX) {
-				float s = 1 + scaleOffset * mix;
-				bone.a *= s;
-				bone.c *= s;
-			}
-			if (physics == Physics.update) {
-				tx = l * bone.a;
-				ty = l * bone.c;
-			}
-			bone.updateAppliedTransform();
+		if (scaleX) {
+			float s = 1 + scaleOffset * mix;
+			bone.a *= s;
+			bone.c *= s;
 		}
+		if (physics == Physics.update) {
+			tx = l * bone.a;
+			ty = l * bone.c;
+		}
+		bone.updateAppliedTransform();
 	}
 
 	/** The bone constrained by this physics constraint. */