[lua] Fixed Path/TransformConstraint handling of reflection

spine-lua/PathConstraint.lua

@@ -137,7 +137,19 @@ function PathConstraint:update ()
 	local boneX = positions[1]
 	local boneY = positions[2]
 	local offsetRotation = data.offsetRotation
-	local tip = rotateMode == PathConstraintData.RotateMode.chain and offsetRotation == 0
+	local tip = false;
+	if offsetRotation == 0 then
+			tip = rotateMode == PathConstraintData.RotateMode.chain
+	else
+		tip = false;
+		local p = self.target.bone;
+		if p.a * p.d - p.b * p.c > 0 then
+			offsetRotation = offsetRotation * utils.degRad
+		else
+			offsetRotation = offsetRotation * -utils.degRad
+		end
+	end
+
 	local i = 0
 	local p = 3
 	while i < boneCount do
@@ -173,13 +185,15 @@ function PathConstraint:update ()
 			else
 				r = math_atan2(dy, dx)
 			end
-			r = r - (math_atan2(c, a) - math_rad(offsetRotation))
+			r = r - math_atan2(c, a)			
 			if tip then
 				cos = math_cos(r)
 				sin = math_sin(r)
 				local length = bone.data.length
 				boneX = boneX + (length * (cos * a - sin * c) - dx) * rotateMix;
 				boneY = boneY + (length * (sin * a + cos * c) - dy) * rotateMix;
+			else
+				r = r + offsetRotation
 			end
 			if r > math_pi then
 				r = r - math_pi2

spine-lua/TransformConstraint.lua

@@ -29,6 +29,7 @@
 -------------------------------------------------------------------------------
 
 local setmetatable = setmetatable
+local utils = require "spine-lua.utils"
 local math_pi = math.pi
 local math_pi2 = math.pi * 2
 local math_atan2 = math.atan2
@@ -79,6 +80,10 @@ function TransformConstraint:update ()
 	local tb = target.b
 	local tc = target.c
 	local td = target.d
+	local degRadReflect = 0;
+	if ta * td - tb * tc > 0 then degRadReflect = utils.degRad else degRadReflect = -utils.degRad end
+	local offsetRotation = self.data.offsetRotation * degRadReflect
+	local offsetShearY = self.data.offsetShearY * degRadReflect
 	local bones = self.bones
 	for i, bone in ipairs(bones) do
 		local modified = false
@@ -87,7 +92,7 @@ function TransformConstraint:update ()
 			local b = bone.b
 			local c = bone.c
 			local d = bone.d
-			local r = math_atan2(tc, ta) - math_atan2(c, a) + math_rad(self.data.offsetRotation);
+			local r = math_atan2(tc, ta) - math_atan2(c, a) + offsetRotation
 			if r > math_pi then
 				r = r - math_pi2
 			elseif r < -math_pi then
@@ -143,7 +148,7 @@ function TransformConstraint:update ()
 			elseif r < -math_pi then
 				r = r + math_pi2
 			end
-			r = by + (r + math_rad(self.data.offsetShearY)) * shearMix
+			r = by + (r + offsetShearY) * shearMix
 			local s = math_sqrt(b * b + d * d)
 			bone.b = math_cos(r) * s
 			bone.d = math_sin(r) * s

spine-lua/utils.lua

@@ -30,6 +30,8 @@
 
 local utils = {}
 
+utils.degRad = math.pi / 180
+
 function tablePrint (tt, indent, done)
 	done = done or {}
 	for key, value in pairs(tt) do