diff --git a/cross.py b/cross.py
index 1160071..8f5518a 100644
--- a/cross.py
+++ b/cross.py
@@ -20,35 +20,35 @@ class Cross():
 
     def draw(self):
         Color(*(self.color))
-        Rectangle(pos=(self.pos.x-self.size*1.5,self.pos.y-self.size*0.5),size=(3*self.size,self.size))
-        Rectangle(pos=(self.pos.x-self.size*0.5,self.pos.y-self.size*1.5),size=(self.size,3*self.size))
+        Rectangle(pos=((self.pos.x-1.5)*self.size,(self.pos.y-0.5)*self.size),size=(3*self.size,self.size))
+        Rectangle(pos=((self.pos.x-0.5)*self.size,(self.pos.y-1.5)*self.size),size=(self.size,3*self.size))
 
         # stroke
         Color(1,1,1)
         Line(points=(
-        *(self.pos.x-self.size*0.5,self.pos.y-self.size*0.5),
-        *(self.pos.x-self.size*0.5,self.pos.y-self.size*1.5),
-        *(self.pos.x+self.size*0.5,self.pos.y-self.size*1.5),
-        *(self.pos.x+self.size*0.5,self.pos.y-self.size*0.5),
-        *(self.pos.x+self.size*1.5,self.pos.y-self.size*0.5),
-        *(self.pos.x+self.size*1.5,self.pos.y+self.size*0.5),
-        *(self.pos.x+self.size*0.5,self.pos.y+self.size*0.5),
-        *(self.pos.x+self.size*0.5,self.pos.y+self.size*1.5),
-        *(self.pos.x-self.size*0.5,self.pos.y+self.size*1.5),
-        *(self.pos.x-self.size*0.5,self.pos.y+self.size*0.5),
-        *(self.pos.x-self.size*1.5,self.pos.y+self.size*0.5),
-        *(self.pos.x-self.size*1.5,self.pos.y-self.size*0.5),
-        *(self.pos.x-self.size*0.5,self.pos.y-self.size*0.5),
+        *((self.pos.x-0.5)*self.size,(self.pos.y-0.5)*self.size),
+        *((self.pos.x-0.5)*self.size,(self.pos.y-1.5)*self.size),
+        *((self.pos.x+0.5)*self.size,(self.pos.y-1.5)*self.size),
+        *((self.pos.x+0.5)*self.size,(self.pos.y-0.5)*self.size),
+        *((self.pos.x+1.5)*self.size,(self.pos.y-0.5)*self.size),
+        *((self.pos.x+1.5)*self.size,(self.pos.y+0.5)*self.size),
+        *((self.pos.x+0.5)*self.size,(self.pos.y+0.5)*self.size),
+        *((self.pos.x+0.5)*self.size,(self.pos.y+1.5)*self.size),
+        *((self.pos.x-0.5)*self.size,(self.pos.y+1.5)*self.size),
+        *((self.pos.x-0.5)*self.size,(self.pos.y+0.5)*self.size),
+        *((self.pos.x-1.5)*self.size,(self.pos.y+0.5)*self.size),
+        *((self.pos.x-1.5)*self.size,(self.pos.y-0.5)*self.size),
+        *((self.pos.x-0.5)*self.size,(self.pos.y-0.5)*self.size),
         ))
 
     # check whether a cross at pos interacts with cross
     def check_interaction(self,pos):
-        return ((pos-self.pos)/self.size).int()**2>=5
+        return (pos-self.pos).int()**2>=5
 
     # find position along a line that comes in contact with the line going through pos in direction v
     def move_on_line_to_stick(self,pos,v):
         # relative to cross
-        return self.move_on_line_to_stick_relative((pos-self.pos)/self.size,v/self.size)*self.size+self.pos
+        return self.move_on_line_to_stick_relative(pos-self.pos,v)+self.pos
     def move_on_line_to_stick_relative(self,x,v):
 
         # if x is in the right quadrant
@@ -136,8 +136,8 @@ class Cross_painter(Widget):
     def on_touch_down(self,touch):
         # create new cross
         if touch.button=="right":
-            if self.check_add(Point(touch.x,touch.y)):
-                new=Cross(touch.x,touch.y)
+            if self.check_add(Point(touch.x/Cross.size,touch.y/Cross.size)):
+                new=Cross(touch.x/Cross.size,touch.y/Cross.size)
                 with self.canvas:
                     new.draw()
                 # add to list
@@ -150,7 +150,7 @@ class Cross_painter(Widget):
                 self.selected.selected=False
 
             # find cross under touch
-            self.selected=self.find_cross(Point(touch.x,touch.y))
+            self.selected=self.find_cross(Point(touch.x/Cross.size,touch.y/Cross.size))
             # select
             if self.selected!=None:
                 self.selected.selected=True
@@ -160,7 +160,7 @@ class Cross_painter(Widget):
     def on_touch_move(self,touch):
         # only move on left click
         if touch.button=="left" and self.selected!=None:
-            self.selected.pos=self.check_move(Point(touch.x,touch.y),self.selected)
+            self.selected.pos=self.check_move(Point(touch.x/Cross.size,touch.y/Cross.size),self.selected)
             # redraw
             self.canvas.clear()
             self.draw()
@@ -169,7 +169,7 @@ class Cross_painter(Widget):
     # find the cross at position pos
     def find_cross(self,pos):
         for cross in self.crosses:
-            if cross_distx(pos,cross.pos)<=cross.size/2 or cross_disty(pos,cross.pos)<=cross.size/2:
+            if cross_distx(pos,cross.pos)<=0.5 or cross_disty(pos,cross.pos)<=0.5:
                 return cross
         # none found
         return None