Reorient head based on tongue angle

chameleonic.p8

@@ -425,6 +425,10 @@ function level:can_move(
   return false
  end
 
+ if player.x==mx0+dmx and player.y==my0+dmy then
+  return false
+ end
+ 
  -- todo: check tongue collision
  if player.rope then
   local px,py=mx0*8,my0*8
@@ -588,6 +592,10 @@ function player:update()
   local rx,ry=self:_rope_pos()
   self.rope:drag_dst(rx,ry)
 
+  local tdx,tdy=self.rope:tug_orientxy()
+  if (tdx!=0) self.orientx=tdx
+  if (tdy!=0) self.orienty=tdy
+
   if self.rope:done() then
    self.rope=nil
    add(self.todo,{})
@@ -1214,6 +1222,23 @@ end
 -->8
 -- moved here because it's complicated
 
+function rope:tug_orientxy()
+ local a1=self:_anc(#self.ancs+1)
+ local a0=self:_anc(#self.ancs)
+ local dx=a0.x-a1.x
+ local tdx=0
+ if (dx>3) tdx=1
+ if (dx<-3) tdx=-1
+
+ local dy=a0.y-a1.y
+ local tdy=0
+ if abs(dy)>abs(dx)/2 then 
+  if (dy>3) tdy=1
+  if (dy<-3) tdy=-1
+ end
+ return tdx,tdy
+end
+
 function rope:tug()
  self:_make_consistent()
  if (self.under_destruction) return