Pie plate selector and tweening patch

src/shared/AlgebraEasings.lua

@@ -10,9 +10,15 @@ type LinearFunction = (a: number, b: number, t: number) -> number
 export type EasingStyles = {
     Linear: LinearFunction,
 	InOutBack: EaseFunction,
-	OutBounce: EaseFunction
+	OutBounce: EaseFunction,
+	InQuad: EaseFunction
 }
 
+local function flip(x: number): number
+	return x*0-x
+	
+end
+
 local Ease = {} :: EasingStyles
 --Google straight up gives wrong/bad math
 
@@ -32,4 +38,8 @@ function Ease.OutBounce(n)
 		n<0.909091 and (.9375*(1.*d1-2.4*n*n1)/d1)) or (.984375*(1.*d1-2.66667*n*n1))/d1
 end
 
+function Ease.InQuad(n)
+	return n*n
+end
+
 return Ease

src/shared/Tween.lua

@@ -42,10 +42,12 @@ function Tween:Start(PostInstance, PostProperties, PostTweenSettings)
 
     if PostProperties then
         if self.PreProperties then
-            for tween_prop, tween_value in PostProperties do
-                Props[tween_prop] = tween_value
+            if Props then
+                print("Tween library: Combining PostProperties and PreProperties together", debug.traceback())
+                for tween_prop, tween_value in PostProperties do
+                    Props[tween_prop] = tween_value
+                end
             end
-            print("Tween library: Combining PostProperties and PreProperties together", debug.traceback())
         else
             Props = PostProperties
         end