Merge branch 'main' into intro_sequence

previous attempt tried to use shifts to get 0.4 to 0.2 or 0.8 and multiplication to get -0.8, forgetting that the multiplication would also turn 0.4 into 0 along the way. oops. I got ratholed on the mathematical approach, but a very straightforward lookup table can get more done.

Reviewed-on: #14
Co-authored-by: Kistaro Windrider <kistaro@gmail.com>
Co-committed-by: Kistaro Windrider <kistaro@gmail.com>

chameleonic.p8

@@ -7,6 +7,7 @@ real_modules={}
 
 frame=0
 function _init()
+ -- printh("restarting")
  _doall("init") end
 function _update()
  frame+=1
@@ -192,11 +193,7 @@ end
 title={}
 add(modules,title)
 
-function title:init()
-end
-
 blinkcol=10
-
 function title:draw()
  cls(0)
  -- this is right for 72x32
@@ -213,25 +210,14 @@ start_level = 0
 max_level=15
 
 function title:update()
- if time()*4\1%2==0 then
-  blinkcol=10
- else
  blinkcol=9
- end
+ if (time()*4\1%2==0) blinkcol=10
  
- if btnp(0) then
-  start_level -= 1
-  if (start_level<0) start_level=max_level
- end
- if btnp(1) then
-  start_level += 1
-  if (start_level>max_level) start_level=0
- end 
- if btnp(4) or btnp(5) then
-  modules=real_modules
-  _init() 
-  music(0)
- end
+ if (btnp"0") start_level-=1
+ if (btnp"1") start_level+=1
+ start_level%=max_level
+
+ if (btnp"4" or btnp"5") modules=real_modules _init() music(0)
 end
 
 -->8
@@ -246,9 +232,7 @@ end
 function level:reinit(n)
  self.ix=n
  self.todo={}
- self.bigx=(n%8)
- self.bigy=(n\8)
- self.next_crate_id=1
+ self.bigx,self.bigy=n%8,n\8
 
  self:load_dynobjs()
  self:recollide()
@@ -317,7 +301,7 @@ function level:update()
  end
  if #remove>0 then
   self:recollide()
-  self:reanchor(true)
+  self:reanchor()
  end
 end
 
@@ -325,6 +309,7 @@ function level:load_dynobjs()
  self._crates={}
  self._pits={}
 
+ local crate_id=1
  for mx=0,15,1 do
   for my=0,15,1 do
    local mxy=_mix(mx,my)
@@ -334,22 +319,16 @@ function level:load_dynobjs()
    if def then
     self._crates[mxy]={
      s=s,def=def,
-     id=self.next_crate_id,
+     id=crate_id,
      mx=mx,my=my,
      px=px,py=py,
      todo={}
     }
-    self.next_crate_id+=1
+    crate_id+=1
    end
 
-   if s==28 then -- pit
-    self._pits[mxy]={
-      s=s,
-      mx=mx,my=my,
-      px=px,py=py,
-      contents=nil
-    }
-   end
+   -- pit
+   if (s==28) self._pits[mxy]={s=s,mx=mx,my=my,px=px,py=py}
   end
  end
 end
@@ -420,17 +399,14 @@ function level:reanchor()
  end
  shellsort(self._anch_keys)
  for point in self:anchor_points() do
-  if point.ax_old!=nil then
-   if (player.rope!=nil) player.rope:be_pushed_by(point,point.ax_old,point.ay_old)
-   point.ax_old=nil
-   point.ay_old=nil
+  if point.ax_old and player.rope and (point.ax_old != point.ax or point.ay_old != point.ay) then 
+   -- printh("moving: "..tostring({point.ax_old,point.ay_old}).."=>"..tostring({point.ax,point.ay}))
+   player.rope:be_pushed_by(point,point.ax_old,point.ay_old)
   end
- end
- for point in self:anchor_points() do
-  assert(not point.dropped)
+  point.ax_old,point.ay_old=nil,nil
  end
 
- if (player.rope!=nil) player.rope:relax()
+ if (player.rope) player.rope:relax()
 end
 
 function level:win_at(mx,my)
@@ -466,7 +442,9 @@ function level:spawn_exit()
   if (self:_mget(x,y)!=18) return
   for nx=x-1,x+1 do
    for ny=y-1,y+1 do
-    if nx<0 or ny<0 or nx>15 or ny>15 then
+    -- next check: is at least one of
+    -- nx or ny out of range [0, 15]?
+    if (nx | ny) & 0xFFF0 ~= 0 then
      self._wins[_mix(nx,ny)]=true
     end
    end
@@ -500,26 +478,24 @@ end
 
 function _amix(ax,ay)
  return ax..","..ay
- --if (ax<0 or ay<0 or ax>31 or ay>31) return nil
- --return ay*32+ax
 end
 
 function _mix(mx,my)
   return mx..","..my
- --if (mx<0 or my<0 or mx>15 or my>15) return nil
- --return my*16+mx
 end
 
+-- crate spec:
+-- "up" == 1
+-- "right" == 2
+-- "down" == 4
+-- "left" == 8
+--
+--    +1+
+--    8 2
+--    +4+
 function level:_get_cratedef(s)
- if (s<64 or s>=80) return nil
- 
- local s2=s-64
- return {
-  up=s2&1!=0,
-  right=s2&2!=0,
-  down=s2&4!=0,
-  left=s2&8!=0
- }
+ if (s<64 or s>=80) return
+ return s & 0x000F
 end
 
 function level:get_latch(dx,dy,px,py)
@@ -530,12 +506,7 @@ function level:get_latch(dx,dy,px,py)
  local dx1,dy1=-sgn0(dx),-sgn0(dy)
 
  if crate then
-  if
-   (crate.def.up and dy>0) or
-   (crate.def.down and dy<0) or 
-   (crate.def.left and dx>0) or
-   (crate.def.right and dx<0)
-  then
+  if crate.def & dy1*dy1*(2.5+1.5*dy1)+dx1*dx1*(5-3*dx1) ~= 0 then
    return {
     el="crate",
     dx=dx1,dy=dy1,
@@ -564,39 +535,22 @@ function level:get_latch(dx,dy,px,py)
 	end
 end
 
+ropecheck=split"-0.6,0.4,0.4"
+
 function level:can_move(
  is_player,
  mx0,my0,dmx,dmy,exclude_src,exclude_dst
 )
- if is_player and self:win_at(mx0+dmx,my0+dmy) then
-  return true 
- end
- if is_player and self:get_open_pit(mx0+dmx,my0+dmy) then
-  return wrongbleep:adequately_warned()
- end
+ local mx1,my1=mx0+dmx,my0+dmy
+ if (is_player and self:win_at(mx1,my1)) return true 
+ if (is_player and self:get_open_pit(mx1,my1)) return wrongbleep:adequately_warned()
 
- if self:mcoll(mx0+dmx,my0+dmy) then
-  return false
- end
+ if (self:mcoll(mx1,my1) or player.x==mx1 and player.y==my1) return false
 
- if player.x==mx0+dmx and player.y==my0+dmy then
-  return false
- end
- 
- -- todo: check tongue collision
  if player.rope then
-  local chk=false
-  if dmx==0 and dmy==-1 then
-   chk=player.rope:collide_mrect(mx0+0.4,my0-0.8,0.2,1.6,exclude_src,exclude_dst)
-  elseif dmx==0 and dmy==1 then
-   chk=player.rope:collide_mrect(mx0+0.4,my0+0.2,0.2,1.6,exclude_src,exclude_dst)
-  elseif dmx==-1 and dmy==0 then
-   chk=player.rope:collide_mrect(mx0-0.8,my0+0.4,1.6,0.2,exclude_src,exclude_dst)
-  elseif dmx==1 and dmy==0 then
-   chk=player.rope:collide_mrect(mx0+0.2,my0+0.4,1.6,0.2,exclude_src,exclude_dst)
-  end
-
-  if (chk) return false
+  local w,h=1.2,0.2
+  if (dmx==0) w,h=0.2,1.2
+  if (player.rope:collide_mrect(mx0+ropecheck[dmx+2],my0+ropecheck[dmy+2],w,h,exclude_src,exclude_dst)) return false
  end
  
  return true
@@ -605,22 +559,21 @@ end
 function level:tug_crate(mx0,my0,dmx,dmy)
  local mxy0=_mix(mx0,my0)
  local existing=self._crates[mxy0]
- if (existing==nil) return
+ if (not existing) return
  
  self._crates[mxy0]=nil
-
  local mx1,my1=mx0+dmx,my0+dmy
- local mxy1=_mix(mx1,my1) 
+ local px1,py1=mx1*8,my1*8
  existing.todo={
-  {px=mx1*8+dmx,py=my1*8+dmy,mx=mx1,my=my1,update=function()
+  {px=px1+dmx,py=py1+dmy,mx=mx1,my=my1,update=function()
    self:recollide()
    self:reanchor()
    return true
   end},
-  {px=mx1*8,py=my1*8}
+  {px=px1,py=py1}
  }
 
- self._crates[mxy1]=existing
+ self._crates[_mix(mx1,my1)]=existing
 end
 
 -->8
@@ -629,54 +582,27 @@ player={}
 add(real_modules,player)
 
 function player:init()
- --self:reinit(8,14)
-
  -- don't change this on reinit:
  -- it stays the same when the level is changed or reloaded
  self.vanish_frame=0 
 end
 
 function player:reinit(x,y)
- self.x=x
- self.y=y
- self.px=0
- self.py=0
+ self.x,self.y=x,y
+ self.px,self.py=0,0
  self.todo={}
 
  self.fall_frame=0
- self.reset_frame=0
  
- self.orientx=-1
- self.orienty=0
- 
- self.rope=nil
-end
-
-function player:any_busy()
- if (#self.todo>0) return true
- if (level:busy()) return true
- return false
+ self.orientx,self.orienty=-1,0
 end
 
 function player:update()
- local _addall=function(t,xs)
-  for i in all(xs) do
-   add(t,i)
-  end
- end
-
- local f4 = function(xs) 
-  -- todo: other anim stuff
-  xs[#xs].px=0
-  xs[#xs].py=0
-  return xs
- end
-
  -- this is a non-gameplay action that takes precedence over 
  -- all gameplay actions
  self:_vanish_if_requested()
 
- if not self:any_busy() then
+ if not (#self.todo>0 or level:busy()) then
   if level:win_at(self.x,self.y) then
    level:advance()
    return
@@ -699,29 +625,25 @@ function player:update()
   end
 
   if kbd:btn(4) then
-   if kbd:btnp(4) and self.rope!=nil then 
+   if kbd:btnp(4) and self.rope then 
     self.rope:destroy()
     kbd:release(4)
    end
    -- wait for user to release it
   else
+   local function try_move(dx,dy,f)
+    if (level:can_move(true,self.x,self.y,dx,dy,0,2)) self.todo=f return
+    wrongbleep:bleep()
+   end
    if kbd:btn(0) then 
-    if level:can_move(true,self.x,self.y,-1,0,0,2) then
-     self.todo=f4({{orientx=-1,orienty=0,px=-2},{px=-7},{x=self.x-1}})
-    else wrongbleep:bleep() end
+    try_move(-1,0,{{orientx=-1,orienty=0,px=-2},{px=-7},{x=self.x-1,px=0}})
    elseif kbd:btn(1) then
-    if level:can_move(true,self.x,self.y,1,0,0,2) then
-     self.todo=f4({{orientx=1,orienty=0,px=2},{px=7},{x=self.x+1}})
-    else wrongbleep:bleep() end
+    try_move(1,0,{{orientx=1,orienty=0,px=2},{px=7},{x=self.x+1,px=0}})
    elseif kbd:btn(2) then
-    if level:can_move(true,self.x,self.y,0,-1,0,2) then
-     self.todo=f4({{orienty=-1,py=-2},{py=-7},{y=self.y-1}})
-    else wrongbleep:bleep() end
+    try_move(0,-1,{{orienty=-1,py=-2},{py=-7},{y=self.y-1,py=0}})
    elseif kbd:btn(3) then
-    if level:can_move(true,self.x,self.y,0,1,0,2) then
-     self.todo=f4({{orienty=1,py=2},{py=7},{y=self.y+1}})
-    else wrongbleep:bleep() end
-   elseif self.rope==nil and kbd:btnr(4) then
+    try_move(0,1,{{orienty=1,py=2},{py=7},{y=self.y+1,py=0}})
+   elseif not self.rope and kbd:btnr(4) then
     local dx,dy=self.orientx,self.orienty
     if (dy!=0) dx=0
 
@@ -736,41 +658,35 @@ function player:update()
     
     self.todo={{
      update=function()
-      return self.rope==nil or self.rope:latched()
+      return not self.rope or self.rope:latched()
      end
     }}
    elseif kbd:btnp(5) then
-    if self.rope!=nil then
-     if (not self.rope:tug()) wrongbleep:bleep(9)
-    end
+    if (self.rope and not self.rope:tug()) wrongbleep:bleep(9)
    end
   end
  end
 
- if self.rope then
-  self.rope:update()
- end
  _apply(self,self.todo)
 
  if self.rope then
   self.rope:update()
   if self.rope:done_reeling() then 
-   self.x=self.rope.latch.rec.mx+self.rope.latch.dx
-   self.y=self.rope.latch.rec.my+self.rope.latch.dy
+   local latch=self.rope.latch
+   self.x=latch.rec.mx+latch.dx
+   self.y=latch.rec.my+latch.dy
   end
 
-  local rx=self.x+self.px/8+0.5
-  local ry=self.y+self.py/8+0.5
-  -- do the hokey pokey to work out kinks in the rope
-  self.rope:drag_dst(rx,ry)
+  self.rope:drag_dst(
+   self.x+self.px/8+0.5,
+   self.y+self.py/8+0.5
+  )
 
   local tdx,tdy=self.rope:tug_orientxy()
-  if (tdx!=0) self.orientx=tdx
-  if (tdy!=0) self.orienty=tdy
+  if (tdx) self.orientx=tdx
+  if (tdy) self.orienty=tdy
 
-  if self.rope:done() then
-   self.rope=nil
-  end
+  if (self.rope:done()) self.rope=nil
  end
 end
 
@@ -799,23 +715,27 @@ function player:draw()
  local px=self.x*8+self.px+wrongbleep:vibrate()
  local py=self.y*8+self.py+wrongbleep:vibrate()
 
-
  local head=1-self.orienty
 
  local vanish_level=max((self.vanish_frame-4)/16,0)
  local invis_level=max(self.fall_frame/10,4*(vanish_level-0.75))
  if (invis_level>=1.0) return
 
- --px+=sin(vanish_level*16)*max(vanish_level-0.1,0)*1
+ --[[
  local HEAD=14--3
  local BODY=12--12
  local TAIL=14--14
  local IRIS=7--9
  local PUPIL=0--0
+ ]]
 
- local setpal=function()
-  -- base colors
-  pal{
+  -- in order: head,body,iris,pupil,body again,tail
+ local palette=split"-1,14,14,12,12,-1,-1,-1,7,0,-1,12,14,14,14"
+ local function setpal()
+  --[[
+   -- head
+   nil,14,14,
+   --body
    [2]=HEAD,
    [3]=HEAD,
    [4]=BODY,
@@ -826,7 +746,8 @@ function player:draw()
    [13]=TAIL,
    [14]=TAIL,
    [15]=TAIL,
-  }
+  ]]
+  pal(palette)
 
   -- vanish colors
   local vanish=split"13,15,14,5,4,12,2,3,9,10"
@@ -834,11 +755,7 @@ function player:draw()
    if (vanish_level>i/#vanish) pal(ilc,1)
   end
 
-  if self.fall_frame>3 then
-   local zc=@0x5f00&0xf0
-   for i=0x5f00,0x5f0c,4 do poke4(i,0x0101.0101) end
-   poke(0x5f00,zc|0x01)
-  end
+  if (self.fall_frame>3) local zc=@0x5f00&0xf0 for i=0x5f00,0x5f0c,4 do poke4(i,0x0101.0101) end poke(0x5f00,zc|0x01)
  end
 
  local rx,ry=self.x*8+self.px+1,self.y*8+self.py+2
@@ -846,7 +763,7 @@ function player:draw()
 
  if self.rope then
   local rx_adj,ry_adj=self.rope:affected_src_xy(rx,ry)
-  if rx_adj!=nil then
+  if rx_adj then
    local drx,dry=rx_adj-rx,ry_adj-ry
    rx,ry=rx+drx,ry+dry
    px,py=px+drx,py+dry
@@ -880,8 +797,8 @@ function rope:new(
  local r={
   id=0,
   anchors={
-   {ax=src_ax,ay=src_ay,prev=nil,next=nil},
-   {ax=dst_ax,ay=dst_ay,prev=nil,next=nil}
+   {ax=src_ax,ay=src_ay},
+   {ax=dst_ax,ay=dst_ay}
   },
   state={name="cast",frame=0},
   latch=latch,
@@ -914,10 +831,7 @@ function rope:update()
  elseif self.state.name=="latched" then
   if (self.latch==nil) wrongbleep:bleep(5) self:destroy() return
 
-  if 
-   self.latch!=nil and
-   self.latch.rec!=nil 
-  then
+  if self.latch and self.latch.rec then
    self:drag_src(
     self.latch.rec.mx+0.5+self.latch.ax_offset,
     self.latch.rec.my+0.5+self.latch.ay_offset
@@ -979,11 +893,10 @@ end
 
 function rope:draw(artificial_px,artificial_py)
  local points,highlight=self:_tug(true)
- if (self.state.name=="done") return
- local perc_to_show=1.0
- local from_end=false
- if (self.state.name=="cast") perc_to_show=self.state.frame/2
- if (self.state.name=="destroy") perc_to_show=(1.0-self.state.frame/8)^2
+ local n,perc_to_show,from_end = self.state.name,1.0,false
+ if (n=="done") return
+ if (n=="cast") perc_to_show=self.state.frame/2
+ if (n=="destroy") perc_to_show=(1.0-self.state.frame/8)^2
  if (self.state.reelin) from_end=true
 
  points[#points]={x=artificial_px,y=artificial_py}
@@ -1046,6 +959,7 @@ function rope:draw(artificial_px,artificial_py)
  end
 
  -- debug
+ --[[
  local n1=self.src
  local sy=0
  while true do
@@ -1057,8 +971,9 @@ function rope:draw(artificial_px,artificial_py)
    if (n1.associated_with.ady>0) y-=1
   end
   rectfill(x-1,y-1,x+1,y+1,12)
-  print("ax="..n1.ax..",ay="..n1.ay,0,sy)
-  sy+=7
+  print("ax="..n1.ax..",ay="..n1.ay,72,sy)
+  print(tostring(n1.associated_with and (not n1.associated_with.dropped and n1.associated_with.ax==n1.ax and n1.associated_with.ay==n1.ay)),76,sy+7)
+  sy+=14
 
   local n0=n1.prev
   local n2=n1.next
@@ -1092,6 +1007,7 @@ function rope:draw(artificial_px,artificial_py)
 	 pset(x+p.adx,y,11)
 	 pset(x,y+p.ady,11)
 	end
+ ]]
 end
 
 function rope:drag_dst(x,y)
@@ -1110,6 +1026,21 @@ function rope:drag(n1,ax_new,ay_new)
 end
 
 function rope:relax()
+ local n0=self.src
+ while true do
+  if (n0==nil) break
+  if n0.associated_with and n0.associated_with.dropped then
+   for i in level:anchor_points() do
+    if i.ax==n0.ax and i.ay==n0.ay then
+     n0.associated_with=i
+     break
+    end
+   end
+  end
+
+  n0=n0.next
+ end
+
  local n0=self.src
  while true do
   local n1=n0.next
@@ -1145,8 +1076,9 @@ function rope:relax()
 
    local would,x1_new,y1_new=would_stick(x0,y0,n1.associated_with,x2,y2)
    if not would and not (n1.ax==x1_new and n1.ay==y1_new) then
+    -- printh("dragging: "..tostring{n1.associated_with, {x1_new, y1_new}})
     -- printh("relaxing: "..tostring(n0.associated_with).."->"..tostring(n1.associated_with).."->"..tostring(n2.associated_with))
-    self:_drag(n1,x1_new,y1_new)
+    self:_drag(n1,x1_new,y1_new,n1.ax,n1.ay)
     n0=n1.prev
     n2=n1.next
     n0.next=n2
@@ -1232,13 +1164,8 @@ function would_stick(x0,y0,anchor,x2,y2)
  local dx=x2-x0
  local dy=y2-y0
 
- -- there is no reason for an acute angle to stick around in this world
- --[[
- local ang0=atan2(x2-x1,y2-y1)
- local ang2=atan2(x0-x1,y0-y1)
- local diff=abs((ang0-ang2 + 0.5)%1-0.5)
- if (diff<0.25) return false,x0,y0,0,0
- ]]--
+ if (x1==x0 and y1==y0) return false
+ if (x1==x2 and y1==y2) return false
 
  local adx,ady
  local x1_new,y1_new
@@ -1270,21 +1197,24 @@ function rope:be_pushed_by(anchor,ax_old,ay_old)
  local ax_new,ay_new=anchor.ax,anchor.ay
  while true do
   n1=n0.next
-  if (n1==nil) return
+  if (not n1) return
 
   local nx0,ny0=n0.ax,n0.ay
   local nx1,ny1=n1.ax,n1.ay
 
+  local nxmn,nxmx = _mnmx(nx0,nx1)
+  local nymn,nymx = _mnmx(ny0,ny1)
+  -- printh(tostring({anchor,nxmn,nxmx,nymn,nymx}))
+
   if
-   (ax_new==ax_old and nx0<=anchor.ax and anchor.ax<=nx1) and 
-   (ay_new==ay_old and ny0<=anchor.ay and anchor.ay<=ny1) and 
-   not (anchor.ax==nx0 and anchor.ay==ny0) and
-   not (anchor.ax==nx1 and anchor.ay==ny1) and
+   (ax_new!=ax_old or (nxmn<=anchor.ax and anchor.ax<=nxmx)) and 
+   (ay_new!=ay_old or (nymn<=anchor.ay and anchor.ay<=nymx)) and 
 
    (_which_side(ax_old,ay_old,nx0,ny0,nx1,ny1)!= 
     _which_side(ax_new,ay_new,nx0,ny0,nx1,ny1) 
    ) and would_stick(nx0,ny0,anchor,nx1,ny1)
   then
+   -- printh("found (in): "..tostring({{nx0,ny0},{nx1,ny1}, anchor}))
    local nx05,ny05
    if ax_new==ax_old then
     nx05=anchor.ax
@@ -1311,8 +1241,14 @@ function rope:be_pushed_by(anchor,ax_old,ay_old)
  end
 end
 
-function rope:_drag(n1,ax1_new,ay1_new)
- local function _sweep_radar(ax_pivot,ay_pivot,ax_far0,ay_far0,ax_far1,ay_far1)
+function rope:_drag(n1,ax1_new,ay1_new,ax_removing,ay_removing)
+ local function _sweep_radar(ax_lhs,ay_lhs,ax_rhs,ay_rhs,ax_pivot,ay_pivot,ax_far0,ay_far0,ax_far1,ay_far1)
+  local function _uncreatable(anchor)
+   return (anchor.ax==ax_lhs and anchor.ay==ay_lhs) or
+    (anchor.ax==ax_rhs and anchor.ay==ay_rhs) or
+    (anchor.ax==ax_removing and anchor.ay==ay_removing)
+  end
+
   if (ax_far0==ax_far1 and ay_far0==ay_far1) return nil
 
   if ax_far0==ax_far1 then
@@ -1323,9 +1259,7 @@ function rope:_drag(n1,ax1_new,ay1_new)
    for ay_far_new in _stepfrom(ay_far0,ay_far1) do
     for anchor in level:anchor_points() do
      if 
-      not (anchor.ax==ax_pivot and anchor.ay==ay_pivot) and
-      -- not (anchor.ax==ax_far0 and anchor.ay==ay_far0) and
-      not (anchor.ax==ax_far1 and anchor.ay==ay_far1) and
+      not _uncreatable(anchor) and
       (ax0<=anchor.ax and anchor.ax<=ax1) and 
       would_stick(ax_pivot,ay_pivot,anchor,ax_far,ay_far_new) and
       (
@@ -1346,11 +1280,9 @@ function rope:_drag(n1,ax1_new,ay1_new)
    for ax_far_new in _stepfrom(ax_far0,ax_far1) do
     for anchor in level:anchor_points() do
      if 
-      not (anchor.ax==ax_pivot and anchor.ay==ay_pivot) and
-      -- not (anchor.ax==ax_far0 and anchor.ay==ay_far0) and
-      not (anchor.ax==ax_far1 and anchor.ay==ay_far1) and
-      would_stick(ax_pivot,ay_pivot,anchor,ax_far_new,ay_far) and
+      not _uncreatable(anchor) and
       (ay0<=anchor.ay and anchor.ay<=ay1) and 
+      would_stick(ax_pivot,ay_pivot,anchor,ax_far_new,ay_far) and
       (
         _which_side(anchor.ax,anchor.ay,ax_pivot,ay_pivot,ax_far_old,ay_far) !=
         _which_side(anchor.ax,anchor.ay,ax_pivot,ay_pivot,ax_far_new,ay_far)
@@ -1371,7 +1303,10 @@ function rope:_drag(n1,ax1_new,ay1_new)
  local n0=n1.prev
  while true do
   if (n0==nil) break
-  local anch=_sweep_radar(n0.ax,n0.ay,ax1_old,ay1_old,ax1_new,ay1_new)
+  local anch=_sweep_radar(
+   n0.ax,n0.ay,n1.ax,n1.ay,
+   n0.ax,n0.ay,ax1_old,ay1_old,ax1_new,ay1_new
+   )
   if (anch==nil) break
   local n05={ax=anch.ax,ay=anch.ay,associated_with=anch,prev=n0,next=n1}
   -- printh("creating pre: "..tostring(n0.associated_with).."->"..tostring(n05.associated_with).."->"..tostring(n1.associated_with))
@@ -1383,7 +1318,10 @@ function rope:_drag(n1,ax1_new,ay1_new)
  local n2=n1.next
  while true do
   if (n2==nil) break
-  local anch=_sweep_radar(n2.ax,n2.ay,ax1_old,ay1_old,ax1_new,ay1_new)
+  local anch=_sweep_radar(
+   n1.ax,n1.ay,n2.ax,n2.ay,
+   n2.ax,n2.ay,ax1_old,ay1_old,ax1_new,ay1_new
+  )
   if (anch==nil) break
   local n15={ax=anch.ax,ay=anch.ay,associated_with=anch,prev=n1,next=n2}
   -- printh("creating post: "..tostring(n1.associated_with).."->"..tostring(n15.associated_with).."->"..tostring(n2.associated_with))
@@ -1397,7 +1335,7 @@ function _stepfrom(x0,x1)
  local done=false
  if x0==x1 then
   return function() 
-   if (done) return nil
+   if (done) return
    done=true return x0
   end
  end
@@ -1479,12 +1417,12 @@ function rope:tug_orientxy()
  local a1=self.dst
  local a0=self.dst.prev
  local dx=a0.ax-a1.ax
- local tdx=0
+ local tdx=nil
  if (dx>3/8) tdx=1
  if (dx<-3/8) tdx=-1
 
  local dy=a0.ay-a1.ay
- local tdy=0
+ local tdy=nil
  if abs(dy)>abs(dx)/2 then 
   if (dy>3/8) tdy=1
   if (dy<-3/8) tdy=-1
@@ -1726,8 +1664,8 @@ end
 level_text={by_lvl={}}
 add(real_modules,level_text)
 level_text_raw={
- "9`9`11`\f7\#0press 🅾️ to mlem & unmlem",
- "9`33`17`\f7\#0❎ to yoink"
+ "0`9`11`\f7\#0press 🅾️ to mlem & unmlem",
+ "0`33`17`\f7\#0❎ to yoink"
 }
 function level_text:init()
  for i=0,32 do level_text.by_lvl[i]={} end
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