One last intermediate room

Remove unused vars, convert tug_crate arg to table

The tug_crate conversion is for performance. `foreach(tbl, predefined_func)` is substantially faster than a standard `for` loop using the `all` iterator. However, if the function inside the foreach is defined inline, it's much slower due to closure-construction overhead (even though nothing is being closed over). Converting `tug_crate` to take a table as an argument allows foreach to feed right into it, and it also naturally suggests a rewrite a few lines down to get rid of duplicative listing of `mx0,my0,dmx,dmy`, saving several tokens.

I'm going to take a look at can_move to see if it's worth making iits mx0,my0,dmx,dmy arguments into a table as well.

can_move also takes a rope operation table

this is approximately token-neutral but performance-saving. each function parameter makes its call cost worse. When can_move is called inside a loop, we already have a table and we unpack to call can_move; moving the unpack into can_move saves us marshalling cost. It requires us to construct a table in a different spot (where we were not previously doing so) but that spot is not in a loop.

calc_push op loop golf

Reorganizing conditionals saves tokens here.

Fix syntax errors.

This also saves a few tokens and cycles by turning level:tug_crate into a free function. It's not _pretty_ but it's the least bad option.

_calc_push golf redux

Removed unnecessary variable declarations and conditional cases by using an "assume, alternate, verify assumption" pattern and reusing ax0/ay0 when they would never be referenced again.

Fix syntax errors.

Slightly more efficient fix to level_tug_crate.

Reviewed-on: pyrex/chameleonic#25
Co-authored-by: Kistaro Windrider <kistaro@gmail.com>
Co-committed-by: Kistaro Windrider <kistaro@gmail.com>

chameleonic.p8

@@ -1,21 +1,20 @@
 pico-8 cartridge // http://www.pico-8.com
-version 39
+version 41
 __lua__
 -- setup
 modules={}
 real_modules={}
 
-frame=0
 function _init()
  -- printh("restarting")
- _doall("init")
+ _doall"init"
 end
 
-function _update()
- frame+=1
- if (frame%1==0) _doall("update") end
+function _update60()
+ _doall"update" end
 function _draw()
- _doall("draw") end
+ _doall"draw"
+end
 
 function music_on()
  if (stat(54) ~= 0) music(0)
@@ -97,11 +96,10 @@ function linefill(ax,ay,bx,by,r,c)
   local _x1,_y1=x1,y1
   if(y0>y1) x0,y0,x1,y1=x1,y1,x0,y0
   local dx=(x1-x0)/(y1-y0)
-  if(y0<0) x0-=y0*dx y0=-1
   local cy0=y0\1+1
   -- sub-pix shift
   x0+=(cy0-y0)*dx
-  for y=y0\1+1,min(y1\1,127) do
+  for y=cy0,min(y1\1,127) do
    -- open span?
    local span=spans[y]
    if (span) rectfill(x0,y,span,y)
@@ -125,15 +123,6 @@ function sgn0(x)
  return x!=0 and sgn(x) or 0
 end
 
-function inorder(tbl)
- local prev
- for v in all(tbl) do
-  if (prev and v < prev) return
-  prev = v
- end
- return true
-end
-
 function _mnmx(x,y)
  if (x>y)return y,x
  return x,y
@@ -141,20 +130,18 @@ end
 
 
 function _rast(
- xs,ys,x0,y0,x1,y1
+ xys,x0,y0,x1,y1
 )
  local function _add()
-  local n=#xs
-  if (n==0 or xs[n]!=x0 or ys[n]!=y0) add(xs,x0) add(ys,y0)
+  local n=#xys
+  local xy0={x0,y0}
+  if (n==0 or not _anch_eq(xys[n],xy0)) add(xys,xy0)
  end
 
  local dx,dy=abs(x1-x0),abs(y1-y0)
- local sx=-1
- local sy=-1
- if (x0<x1) sx=1
- if (y0<y1) sy=1
+ local sx,sy=sgn(x1-x0),sgn(y1-y0)
 	
- local done,err
+ local err
  if dx>dy then
   err=dx/2.0
   while x0!=x1 do
@@ -266,9 +253,9 @@ end
 title={}
 add(modules,title)
 
-lvlshimmer = {4,9,10,10,9}
+lvlshimmer = split"4,9,10,10,9"
 function title:draw()
- cls(0)
+ cls"0"
  -- this is right for 72x32
  spr(96,28,56,9,2)
  print("pyrex",32,73,7)
@@ -290,7 +277,7 @@ end
 function title:update()
  if (btnp"0") start_level-=1
  if (btnp"1") start_level+=1
- start_level%=(max_level+1)
+ start_level%=max_level+1
  if btn"3" and not wiped then
   wrongbleep:bleep()
   if (wrongbleep:adequately_warned()) then
@@ -337,10 +324,25 @@ function level:advance()
 end
 
 normpal = {[1]=0,[8]=0,[14]=0}
+ixes=split"5,3,15,10,13,4,9"
+easy=split"1,131,6,129,6,141,12"
+moderate=split"3,139,15,5,6,4,9"
+hard=split"134,135,142,134,6,142,140"
+brutal=split"8,137,9,130,6,13,138"
+
+function level:draw3()
+ local p=easy
+ if (self.ix>=6) p=moderate
+ if (self.ix>=12) p=hard
+ if (self.ix>=21) p=brutal
+ for i=1,7 do
+  pal(ixes[i],p[i],1)
+ end
+end
+
 function level:draw()
- cls(5)
- fillp()
  pal(normpal)
+ cls"10"
  map(
   self.bigx*16,self.bigy*16,
   0,0,16,16,
@@ -430,8 +432,9 @@ end
 function level:recollide_reanchor()
  self._coll={}
  for mx=0,15 do
+  local kmx=mx..","
   for my=0,15 do
-   local mxy=_mix{mx,my}
+   local mxy=kmx..my
    self._coll[mxy]=
     fget(self:_mget(mx,my),7) or
     self._crates[mxy]
@@ -439,18 +442,24 @@ function level:recollide_reanchor()
  end
 
  local anch_new={}
- for dxy in all{{-1,-1},{1,-1},{-1,1},{1,1}} do
+ for dxy in all(gsv[[-1`-1
+ 1`-1
+ -1`1
+ 1`1]]) do
   local dx,dy=unpack(dxy)
-  assert(dx!=0 and dy!=0)
+  local c=self._coll
   for mx0=0,15 do
+   local mx1=mx0+dx
+   local kmx0,kmx1=mx0..",",mx1..","
    for my0=0,15 do
-    local mx1,my1=mx0+dx,my0+dy
+    local my1=my0+dy
 
+    -- bypass mcoll for MEGA SPEED
     if (
-     self:mcoll(mx0,my0) and not self:get_crate(mx0,my0) and
-     not self:mcoll(mx0,my1) and
-     not self:mcoll(mx1,my0) and
-     not self:mcoll(mx1,my1)
+     c[kmx0..my0] and not self:get_crate(mx0,my0) and
+     not c[kmx0..my1] and
+     not c[kmx1..my0] and
+     not c[kmx1..my1]
     ) then
      local key=_mix{"GEOM",mx0,my0,dx,dy}
      anch_new[key]= {
@@ -494,10 +503,6 @@ function level:recollide_reanchor()
  if player.rope then
   player.rope:experience_anchor_moves(moves)
  end
-
- for point in self:anchor_points() do
-  point.moved=nil
- end
 end
 
 function level:win_at(mx,my)
@@ -558,7 +563,8 @@ function level:spawn_exit()
  assert(spawned)
 end
 
-function level:mcoll(mx,my)
+function level:mcoll(mxy)
+ local mx,my=unpack(mxy)
  if ((mx | my) & 0xFFF0!=0) return true
  return self._coll[_mix{mx,my}]
 end
@@ -633,15 +639,17 @@ end
 
 ropecheck=split"-0.6,0.4,0.4"
 
+-- argument "o" is a rope operation:
+-- array of [mx0,my0,dmx,dmy]
 function level:can_move(
- is_player,
- mx0,my0,dmx,dmy,exclude_src,exclude_dst
+ is_player,o,exclude_src,exclude_dst
 )
+ local mx0,my0,dmx,dmy=unpack(o)
  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(mx1,my1) or player.x==mx1 and player.y==my1) return 
+ if (self:mcoll{mx1,my1} or player.x==mx1 and player.y==my1) return 
 
  if player.rope then
   local w,h=1.2,0.2
@@ -652,7 +660,12 @@ function level:can_move(
  return true
 end
 
-function level:tug_crate(mx0,my0,dmx,dmy)
+-- argument is a rope operation:
+--  array of [mx0,my0,dmx,dmy]
+-- must be a free function
+--   to use as a foreach target
+function level_tug_crate(t)
+ local self,mx0,my0,dmx,dmy=level,unpack(t)
  local mxy0=_mix{mx0,my0}
  local existing=self._crates[mxy0]
  if (not existing) return
@@ -671,6 +684,47 @@ function level:tug_crate(mx0,my0,dmx,dmy)
  self._crates[_mix{mx1,my1}]=existing
 end
 
+-->8
+-- particles
+particles={}
+add(real_modules,particles)
+function particles:init()
+ self.a={}
+end
+function particles:update()
+ local a2={}
+ for i in all(particles.a) do
+  i.t+=1
+  i[1]+=i.dx
+  i[2]+=i.dy
+  i.dy+=i.ddy
+  if (i.t<i.mt) add(a2,i)
+ end
+ particles.a=a2
+end
+
+function particles:move(x,y,dx,dy)
+ for i=0,1,0.25 do
+  local px=(x+dx*i)*8+2
+  local py=(y+dy*i)*8+4
+  px+=rnd"4"
+  py+=rnd"6"
+  add(self.a,{
+   px,py,6,
+   dx=rnd()-0.5,
+   dy=-rnd(0.5),
+   ddy=0.02,
+   t=-rnd"4",
+   mt=4+rnd"4"
+  })
+ end
+end
+
+function particles:draw()
+ for i in all(particles.a) do
+  if (i.t>0) pset(unpack(i))
+ end
+end
 -->8
 --player handling
 player={}
@@ -734,12 +788,13 @@ function player:update()
   else
    local x,y=self.x,self.y
    local function try_move(dx,dy,f)
-    if level:can_move(true,x,y,dx,dy,0,2) then 
+    if level:can_move(true,{x,y,dx,dy},0,2) then 
      self.todo=f 
-     self.cooldown=3
+     self.cooldown=8
      local t=f[#f]
      t.x=x+dx
      t.y=y+dy
+     particles:move(x,y,dx,dy)
      return
     end
     wrongbleep:bleep()
@@ -756,7 +811,7 @@ function player:update()
     local dx,dy=self.orientx,self.orienty
     if (dy!=0) dx=0
 
-    while not level:mcoll(x,y) do x+=dx y+=dy end
+    while not level:mcoll{x,y} do x+=dx y+=dy end
 
     self.rope=rope:new(
      {x+0.5-dx*0.5,y+0.5-dy*0.5},
@@ -802,7 +857,7 @@ end
 
 function player:_vanish_if_requested() 
  if kbd:btn(5) then
-  self.vanish_frame+=1
+  self.vanish_frame+=0.5
 
   if (self.fall_frame>0 or self.vanish_frame>20) then
    self.rope=nil
@@ -811,7 +866,7 @@ function player:_vanish_if_requested()
    self.vanish_frame=20
   end
  else
-  self.vanish_frame-=1
+  self.vanish_frame-=0.5
  end
 
  self.vanish_frame=max(self.vanish_frame,0)
@@ -862,7 +917,7 @@ function player:draw()
   -- vanish colors
   local vanish=split"13,15,14,5,4,12,2,3,9,10"
   for i,ilc in ipairs(vanish) do
-   if (vanish_level>i/#vanish) pal(ilc,5)
+   if (vanish_level>i/#vanish) pal(ilc,10)
   end
 
   if (self.fall_frame>3) local zc=@0x5f00&0xf0 for i=0x5f00,0x5f0c,4 do poke4(i,0x0505.0505) end poke(0x5f00,zc|0x01)
@@ -872,7 +927,7 @@ function player:draw()
  if (self.orientx==1) rx+=6
 
  if self.rope then
-  local rx_adj,ry_adj=self.rope:affected_src_xy(rx,ry)
+  local rx_adj,ry_adj=self.rope:affected_src_xy{rx,ry}
   if rx_adj then
    local drx,dry=rx_adj-rx,ry_adj-ry
    rx,ry=rx+drx,ry+dry
@@ -880,17 +935,16 @@ function player:draw()
   end
  end
 
+ setpal()
  if self.orientx==-1 then
-  setpal()
   spr(16,px+6,py-2,1,1)
   spr(17,px+1,py,1,1)
-  if (self.rope and invis_level<=0.25) pal() self.rope:draw(self.x*8+self.px+1,self.y*8+self.py+2) setpal()
+  if (self.rope and invis_level<=0.25) pal() self.rope:draw{self.x*8+self.px+1,self.y*8+self.py+2} setpal()
   spr(head,px-3,py-3,1,1)
  else
-  setpal()
   spr(16,px-6,py-2,1,1,true)
   spr(17,px-1,py,1,1,true)
-  if (self.rope and invis_level<=0.25) pal() self.rope:draw(self.x*8+self.px+7,self.y*8+self.py+2) setpal()
+  if (self.rope and invis_level<=0.25) pal() self.rope:draw{self.x*8+self.px+7,self.y*8+self.py+2} setpal()
   spr(head,px+3,py-3,1,1,true)
  end
  pal()
@@ -937,13 +991,7 @@ function rope:update()
 
  elseif self.state.name=="latched" then
   if (not self.latch) wrongbleep:bleep(5) self:destroy() return
-
-  if self.latch.rec then
-   if self.latch.rec.dead==true then 
-    self:destroy()
-   end
-  end
-
+  if (self.latch.rec and self.latch.rec.dead) self:destroy()
   if (not self:_check_pinch()) self:destroy()
 
  elseif self.state.name=="destroy" then -- destroy
@@ -959,125 +1007,100 @@ function rope:destroy(reelin)
  self.state={name="destroy",frame=0,reelin=reelin}
 end
 
-function rope:affected_src_xy(artificial_px,artificial_py)
- -- this is the loop from :draw but simplified
- if (not self.state.reelin) return 
-
- perc_to_show=(1.0-self.state.frame/8)^2
- local points=self:_anchors_simplified()
- points[#points]={x=artificial_px,y=artificial_py}
-
- local len=0
- for i=1,#points-1 do len+=distance(points[i],points[i+1]) end
- local len_to_show=perc_to_show*len
-
- local len_cumulative=0
- for i=1,#points-1 do
-  local src=points[i]
-  local dst=points[i+1]
-
-  local x,y=dst.x,dst.y
-  local dx,dy=src.x-x,src.y-y
-
-  local len_here=len_to_show-len_cumulative
-  local dist_base=distance_dxy(dx,dy)
-  len_cumulative+=dist_base 
-
-  if len_here>0 and dist_base>0 then
-   local coef=min(len_here/dist_base,1.0)
-
-   return x+dx-dx*coef,y+dy-dy*coef
-  end
- end
-
- return points[1]
-end
-
-function rope:draw(artificial_px,artificial_py)
- local points,highlight,hypo_ops,hypo_blocks=self:_tug(true)
- local n,perc_to_show,from_end = self.state.name,1.0
+function rope:_resegment(points,artificial_pxy,cb)
+ local n,perc_to_show,from_end=self.state.name,1.0
  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/4)^2
  if (self.state.reelin) from_end=true
-
+ local artificial_px,artificial_py=unpack(artificial_pxy)
  points[#points]={x=artificial_px,y=artificial_py}
 
  local len=0
  for i=1,#points-1 do
   len+=distance(points[i],points[i+1])
  end
- local len_to_show=perc_to_show*len
+ local len_to_show,ia,iz,istep=perc_to_show*len,#points-1,1,-1
+ if (from_end) ia,iz,istep=iz,ia,1
 
- local len_cumulative=0
- local ia,iz,istep=#points-1,1,-1
- if (from_end) ia,iz,istep=1,#points-1,1
+ for i=ia,iz,istep do
+  local src,dst=points[i],points[i+1]
+  local x,y=dst.x,dst.y
+  local dx,dy=src.x-x,src.y-y
+
+  local dist_base=sqrt(dx*dx+dy*dy)
+
+  local coef=min(len_to_show/dist_base,1.0)
+  len_to_show-=dist_base 
+  dx,dy=dx*coef,dy*coef
+
+  if (from_end) x,y=src.x-dx,src.y-dy
+
+  local v0,v1=cb(x,y,dx,dy,i)
+  if (coef<1) return v0,v1
+ end
+end
+
+function rope:affected_src_xy(artificial_pxy)
+ if (not self.state.reelin) return 
+
+ return self:_resegment(
+  self:_anchors_simplified(),artificial_pxy,
+  function(x,y) return x,y end
+ )
+end
+
+TONGUE_SEGS=gsv[[0`0.25`1
+0.25`0.9`0.5
+0.9`1`1]]
+
+function rope:draw(artificial_pxy)
+ local points,highlight,hypo_ops,hypo_blocks=self:_tug(true)
 
  local function colorh(ix)
   color(8)
   if (highlight==ix) color(12)
  end
- for i=ia,iz,istep do
-  local src=points[i]
-  local dst=points[i+1]
-
-  local x,y=dst.x,dst.y
-  local dx,dy=src.x-x,src.y-y
-
-  local len_here=len_to_show-len_cumulative
-  local dist_base=distance_dxy(dx,dy)
-  len_cumulative+=dist_base 
-
-  if len_here>0 and dist_base>0 then
-   local coef=min(len_here/dist_base,1.0)
-
-   if from_end then
-    x,y=x+dx-dx*coef,y+dy-dy*coef
-   end
-   dx,dy=dx*coef,dy*coef
 
+ self:_resegment(points,artificial_pxy,
+  function(x,y,dx,dy,i) 
    colorh(i)
-
-   local function lf(d0,d1,w)
+   foreach(TONGUE_SEGS,function(row)
+    local d0,d1,w=unpack(row)
     linefill(x+d0*dx,y+d0*dy,x+d1*dx,y+d1*dy,w)
-   end
-
-   lf(0,0.25,1.0)
-   lf(0.25,1,0.5)
-   lf(0.9,1,1.0)
-   circfill(x+dx+0.5,y+dy+0.5,1.0)
+   end)
+   circfill(x+dx,y+dy,1)
   end
- end
+ )
 
  -- draw latch
  local l=self.latch
- if l and l.rec and (perc_to_show>=1.0 or from_end) then
+ if l and l.rec and (self.state.reelin or self:latched()) then
   local function rfsplit(x) rectfill(unpack(split(x))) end
-  local ldx,ldy=l.dx,l.dy
   colorh(0)
   camera(-l.rec.px,-l.rec.py)
-  if (ldx==-1) rfsplit"0,3,2,4"
-  if (ldx==1) rfsplit"5,3,7,4"
-  if (ldy==-1) rfsplit"3,0,4,2"
-  if (ldy==1) rfsplit"3,5,4,7"
+  if (l.dx==-1) rfsplit"0,3,2,4"
+  if (l.dx==1) rfsplit"5,3,7,4"
+  if (l.dy==-1) rfsplit"3,0,4,2"
+  if (l.dy==1) rfsplit"3,5,4,7"
   camera()
   color()
  end
 
  -- hypothetical
  local time=t()-self.flicker_t
- if n=="latched" and time>0 and not level:busy() then
-  if time%0.5>0.25 then
-   for o in all(hypo_ops) do
+ local flicker_on=time%0.5>0.25
+ if self:latched() and time>0 and not level:busy() then
+  if flicker_on then
+   foreach(hypo_ops, function(o)
     local mx0,my0,dmx,dmy=unpack(o)
-    local px1,py1=(mx0+dmx)*8,(my0+dmy)*8
-    spr(14,px1,py1)
-   end
+    spr(14,(mx0+dmx)*8,(my0+dmy)*8)
+   end)
   end
-  for o in all(hypo_blocks) do
+  foreach(hypo_blocks, function(o) 
    local x,y,dx,dy=unpack(o)
-   spr(53,8*x+4*dx,8*y+4*dy,1,1,time%0.5>0.25)
-  end
+   spr(34,8*x+4*dx,8*y+4*dy,1,1,flicker_on)
+  end)
  end
 
  -- debug
@@ -1158,7 +1181,7 @@ function rope:relax()
 
   local adxy,position_new=calc_tension(n0,n1,n2)
   local anch=level:anchor_at_tension(n1,adxy)
-  if not anch or _anch_eq(n1,position_new) then
+  if not anch then
    self:_drag(n1,position_new,{_anch_unpack(n1)})
    _anch_del(n1)
   else n0=n0.next end
@@ -1171,60 +1194,43 @@ function rope:_check_pinch()
 
  local n0=self.src
 
- local qxs,qys={},{}
+ local qxys={}
  while true do 
   local n1=n0.next
   if (not n1) break 
 
   local n0ax,n0ay=_anch_unpack(n0)
   local n1ax,n1ay=_anch_unpack(n1)
-  _rast(qxs,qys,flr(n0ax*2),flr(n0ay*2),flr(n1ax*2),flr(n1ay*2)) 
+  _rast(qxys,n0ax\0.5,n0ay\0.5,n1ax\0.5,n1ay\0.5) 
   n0=n1
  end
 
- local function _possible_tiles(qx,qy)
-  local mx0=(qx-1)\2
-  local mx1=qx\2
-  local my0=(qy-1)\2
-  local my1=qy\2
-
+ local function _possible_tiles(t)
+  local qx,qy=unpack(qxys[t])
   local poss={}
-  for mx=mx0,mx1 do
-   for my=my0,my1 do
-    add(poss,{mx=mx,my=my})
+  for mx=(qx-1)\2,qx\2 do
+   for my=(qy-1)\2,qy\2 do
+    if (not level:mcoll{mx,my}) add(poss,{mx,my})
    end
   end
-  return poss
- end
- local function _blocked(qx,qy)
-  for i in all(_possible_tiles(qx,qy)) do
-   if (not level:mcoll(i.mx,i.my)) return 
-  end
-  return true
+  return all(poss)
  end
 
  -- find cases where i move through an impassable zone
- for i=1,#qxs do
-  if (_blocked(qxs[i],qys[i])) return 
+ for i=1,#qxys do
+  if (not _possible_tiles(i)()) return 
  end
 
  -- find cases where i am cut off diagonally
- for i=3,#qxs do
-  local qx1,qy1=qxs[i-1],qys[i-1]
-  if qx1%2==0 and qy1%2==0 then
+ for i=3,#qxys do
+  local qx1,qy1=unpack(qxys[i-1])
+  if (qx1|qy1)&1==0 then
    local ok
-   for m0 in all(_possible_tiles(qxs[i-2],qys[i-2])) do
-    for m2 in all(_possible_tiles(qxs[i],qys[i])) do
-     local mx0,my0=m0.mx,m0.my
-     local mx2,my2=m2.mx,m2.my
-     if not (level:mcoll(mx0,my0) or level:mcoll(mx2,my2)) then
-      local dmx,dmy=abs(mx2-mx0),abs(my2-my0)
-
-      if dmx==1 and dmy==1 and level:mcoll(mx0,my2) and level:mcoll(mx2,my0) then
-      else
-       ok=true
-      end
-     end
+   for m0 in _possible_tiles(i-2) do
+    for m2 in _possible_tiles(i) do
+     local mx0,my0=unpack(m0)
+     local mx2,my2=unpack(m2)
+     if (mx0==mx2 or my0==my2 or not level:mcoll{mx0,my2} or not level:mcoll{mx2,my0}) ok=true
     end
    end
 
@@ -1454,10 +1460,6 @@ function _which_side(xy,x0y0,x1y1)
  return sgn0((x1-x0)*(y-y0) - (y1-y0)*(x-x0))
 end
 
-function distance_dxy(dx,dy)
- return sqrt(dx*dx+dy*dy)
-end
-
 function distance(p1,p2)
  local dx=p2.x-p1.x
  local dy=p2.y-p1.y
@@ -1540,22 +1542,19 @@ function rope:_tug(hypothetically)
  local blocks = {}
  for i=#ancs-1,2,-1 do
   local ops_before_trash,blocks_before_trash=self:_calc_push(ancs[i+1],ancs[i],ancs[i-1],ancs[i-2])
-  local ops_to_do,corners={}
+  local ops = {}
   for b in all(blocks_before_trash) do add(blocks, b) end
   if #ops_before_trash>0 then 
-   ops_to_do=ops_before_trash
+   ops=ops_before_trash
   else 
    local ops_after_trash,blocks_after_trash=self:_calc_push(ancs[i-2],ancs[i-1],ancs[i],ancs[i+1])
-   ops_to_do=ops_after_trash
+   ops=ops_after_trash
    for b in all(blocks_after_trash) do add(blocks,b) end
   end
 
-  local ops=ops_to_do
-
   if #ops>0 then
    if (hypothetically) return ancs,i-1,ops,blocks
-
-   for o in all(ops) do level:tug_crate(unpack(o)) end
+   foreach(ops, level_tug_crate)
    return true
   end
  end
@@ -1604,18 +1603,19 @@ function rope:_tug(hypothetically)
   end
   
   if not invalid_move then
-   if level:can_move(false,mx0,my0,dmx,dmy,1,0) then
-    if (hypothetically) return ancs,0,{{mx0,my0,dmx,dmy}},blocks
+   local mv = {mx0,my0,dmx,dmy}
+   if level:can_move(false,mv,1,0) then
+    if (hypothetically) return ancs,0,{mv},blocks
 
-    level:tug_crate(mx0,my0,dmx,dmy) 
+    level_tug_crate(mv) 
     return true
    else
-    add(blocks, {mx0,my0,dmx,dmy})
+    add(blocks, mv)
    end
   end
  end
 
- if (hypothetically) return ancs,0,{},blocks
+ if (hypothetically) return ancs,32767,{},blocks -- invalid
  return 
 end
 
@@ -1640,21 +1640,16 @@ function rope:_calc_push(
    smy=-smy
   end
   
-  local mx,dmx
+  local dmx=1 -- maybe push right?
   if anch.adx==-1 and a0.x>an.x+7 then
    -- push left
-   mx=ax0-1
-   dmx=-1
-  elseif anch.adx==1 and a0.x<an.x-7 then
-   -- push right
-   mx=ax0
-   dmx=1
-  else
+   ax0, dmx=ax0-1,-1
+  elseif anch.adx!=1 or a0.x>=an.x-7 then
    return {}
   end
   
   for my=my0,my1,smy do
-   add(ops,{mx,my,dmx,0})
+   add(ops,{ax0,my,dmx,0})
   end
  end
  
@@ -1666,38 +1661,26 @@ function rope:_calc_push(
    smx=-smx
   end
   
-  local my,dmy
+  local dmy=1 -- maybe push down?
   if anch.ady==-1 and a0.y>an.y+6 then
    -- push up
-   my=ay0-1
-   dmy=-1
-   
-  elseif anch.ady==1 and a0.y<an.y-6 then
-   -- push down
-   my=ay0
-   dmy=1
-  else
+   ay0,dmy=ay0-1,-1
+  elseif anch.ady!=1 or a0.y>=an.y-6 then
    return {}
   end
   
   for mx=mx0,mx1,smx do
-   add(ops,{mx,my,0,dmy})
+   add(ops,{mx,ay0,0,dmy})
   end
  end
 
  local ops2,blocked={},{}
  for o in all(ops) do
-  local mx,my,dmx,dmy=unpack(o)
-  if not level:mcoll(mx,my) then
-   -- great!
-  else
-   local crate=level:get_crate(mx,my)
-   if crate then
-    if not level:can_move(false,mx,my,dmx,dmy,0,0) then
-     add(blocked,o)
-     break
-    end
-   else
+  local mx,my=unpack(o)
+  if level:mcoll{mx,my} then
+   if (not level:get_crate(mx, my)) break
+   if not level:can_move(false,o,0,0) then
+    add(blocked,o)
     break
    end
    add(ops2,o)
@@ -1967,28 +1950,28 @@ __gfx__
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-00000000aa0000000000000000ccbb00000cb0000002900000000000000000000000000000000000000000000000000019911991999117111991199111711999
-0000000077a000000000000000000000000cb0000020090000000000000000000000000000000000000000000000000019999991999999911997799119999999
+00000000990000006060000000000000000000000000000000000000000000000000000000000000000000000000000019977991999999911999999119999999
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@@ -2023,38 +2006,38 @@ eeee0000cc04405500444400efeeee5e11111111e5eeeefeeeeeeeeeeeeeeeeeffffffffffffffff
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