Show blocked moves as an animated X.

I am not convinced the sprite is very good. This could help the player learn what pulls were considered before proposing the ones that would occur if the player pulled the tongue. Or it's just visual noise that sucks. Anyway, this correctly captures what the blocked considered moves were, and we can decide whether to use it or not.

chameleonic.p8

@@ -1,20 +1,21 @@
 pico-8 cartridge // http://www.pico-8.com
-version 41
+version 39
 __lua__
 -- setup
 modules={}
 real_modules={}
 
+frame=0
 function _init()
  -- printh("restarting")
- _doall"init"
+ _doall("init")
 end
 
-function _update60()
+function _update()
- _doall"update" end
+ frame+=1
+ if (frame%1==0) _doall("update") end
 function _draw()
- _doall"draw"
+ _doall("draw") end
-end
 
 function music_on()
  if (stat(54) ~= 0) music(0)
@@ -96,10 +97,11 @@ 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=cy0,min(y1\1,127) do
+  for y=y0\1+1,min(y1\1,127) do
    -- open span?
    local span=spans[y]
    if (span) rectfill(x0,y,span,y)
@@ -123,6 +125,15 @@ 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
@@ -130,18 +141,20 @@ end
 
 
 function _rast(
- xys,x0,y0,x1,y1
+ xs,ys,x0,y0,x1,y1
 )
  local function _add()
-  local n=#xys
+  local n=#xs
-  local xy0={x0,y0}
+  if (n==0 or xs[n]!=x0 or ys[n]!=y0) add(xs,x0) add(ys,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,sy=sgn(x1-x0),sgn(y1-y0)
+ local sx=-1
+ local sy=-1
+ if (x0<x1) sx=1
+ if (y0<y1) sy=1
 	
- local err
+ local done,err
  if dx>dy then
   err=dx/2.0
   while x0!=x1 do
@@ -253,9 +266,9 @@ end
 title={}
 add(modules,title)
 
-lvlshimmer = split"4,9,10,10,9"
+lvlshimmer = {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)
@@ -277,7 +290,7 @@ 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
@@ -324,25 +337,10 @@ 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,
@@ -432,9 +430,8 @@ end
 function level:recollide_reanchor()
  self._coll={}
  for mx=0,15 do
-  local kmx=mx..","
   for my=0,15 do
-   local mxy=kmx..my
+   local mxy=_mix{mx,my}
    self._coll[mxy]=
     fget(self:_mget(mx,my),7) or
     self._crates[mxy]
@@ -442,24 +439,18 @@ function level:recollide_reanchor()
  end
 
  local anch_new={}
- for dxy in all(gsv[[-1`-1
+ for dxy in all{{-1,-1},{1,-1},{-1,1},{1,1}} do
- 1`-1
- -1`1
- 1`1]]) do
   local dx,dy=unpack(dxy)
-  local c=self._coll
+  assert(dx!=0 and dy!=0)
   for mx0=0,15 do
-   local mx1=mx0+dx
-   local kmx0,kmx1=mx0..",",mx1..","
    for my0=0,15 do
-    local my1=my0+dy
+    local mx1,my1=mx0+dx,my0+dy
 
-    -- bypass mcoll for MEGA SPEED
     if (
-     c[kmx0..my0] and not self:get_crate(mx0,my0) and
+     self:mcoll(mx0,my0) and not self:get_crate(mx0,my0) and
-     not c[kmx0..my1] and
+     not self:mcoll(mx0,my1) and
-     not c[kmx1..my0] and
+     not self:mcoll(mx1,my0) and
-     not c[kmx1..my1]
+     not self:mcoll(mx1,my1)
     ) then
      local key=_mix{"GEOM",mx0,my0,dx,dy}
      anch_new[key]= {
@@ -503,6 +494,10 @@ 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)
@@ -563,8 +558,7 @@ function level:spawn_exit()
  assert(spawned)
 end
 
-function level:mcoll(mxy)
+function level:mcoll(mx,my)
- local mx,my=unpack(mxy)
  if ((mx | my) & 0xFFF0!=0) return true
  return self._coll[_mix{mx,my}]
 end
@@ -639,17 +633,15 @@ 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,o,exclude_src,exclude_dst
+ is_player,
+ mx0,my0,dmx,dmy,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
@@ -660,12 +652,7 @@ function level:can_move(
  return true
 end
 
--- argument is a rope operation:
+function level:tug_crate(mx0,my0,dmx,dmy)
---  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
@@ -684,47 +671,6 @@ function level_tug_crate(t)
  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={}
@@ -788,13 +734,12 @@ 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=8
+     self.cooldown=3
      local t=f[#f]
      t.x=x+dx
      t.y=y+dy
-     particles:move(x,y,dx,dy)
      return
     end
     wrongbleep:bleep()
@@ -811,7 +756,7 @@ 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},
@@ -857,7 +802,7 @@ end
 
 function player:_vanish_if_requested() 
  if kbd:btn(5) then
-  self.vanish_frame+=0.5
+  self.vanish_frame+=1
 
   if (self.fall_frame>0 or self.vanish_frame>20) then
    self.rope=nil
@@ -866,7 +811,7 @@ function player:_vanish_if_requested()
    self.vanish_frame=20
   end
  else
-  self.vanish_frame-=0.5
+  self.vanish_frame-=1
  end
 
  self.vanish_frame=max(self.vanish_frame,0)
@@ -917,7 +862,7 @@ 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,10)
+   if (vanish_level>i/#vanish) pal(ilc,5)
   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)
@@ -927,7 +872,7 @@ 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
@@ -935,16 +880,17 @@ 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()
@@ -991,7 +937,13 @@ function rope:update()
 
  elseif self.state.name=="latched" then
   if (not self.latch) wrongbleep:bleep(5) self:destroy() return
-  if (self.latch.rec and self.latch.rec.dead) self:destroy()
+
+  if self.latch.rec then
+   if self.latch.rec.dead==true then 
+    self:destroy()
+   end
+  end
+
   if (not self:_check_pinch()) self:destroy()
 
  elseif self.state.name=="destroy" then -- destroy
@@ -1007,100 +959,125 @@ function rope:destroy(reelin)
  self.state={name="destroy",frame=0,reelin=reelin}
 end
 
-function rope:_resegment(points,artificial_pxy,cb)
+function rope:affected_src_xy(artificial_px,artificial_py)
- local n,perc_to_show,from_end=self.state.name,1.0
+ -- 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
  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,ia,iz,istep=perc_to_show*len,#points-1,1,-1
+ local len_to_show=perc_to_show*len
- if (from_end) ia,iz,istep=iz,ia,1
 
- for i=ia,iz,istep do
+ local len_cumulative=0
-  local src,dst=points[i],points[i+1]
+ local ia,iz,istep=#points-1,1,-1
-  local x,y=dst.x,dst.y
+ if (from_end) ia,iz,istep=1,#points-1,1
-  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]
 
- self:_resegment(points,artificial_pxy,
+  local x,y=dst.x,dst.y
-  function(x,y,dx,dy,i) 
+  local dx,dy=src.x-x,src.y-y
-   colorh(i)
+
-   foreach(TONGUE_SEGS,function(row)
+  local len_here=len_to_show-len_cumulative
-    local d0,d1,w=unpack(row)
+  local dist_base=distance_dxy(dx,dy)
-    linefill(x+d0*dx,y+d0*dy,x+d1*dx,y+d1*dy,w)
+  len_cumulative+=dist_base 
-   end)
+
-   circfill(x+dx,y+dy,1)
+  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
+
+   colorh(i)
+
+   local function lf(d0,d1,w)
+    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
  end
- )
 
  -- draw latch
  local l=self.latch
- if l and l.rec and (self.state.reelin or self:latched()) then
+ if l and l.rec and (perc_to_show>=1.0 or from_end) 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 (l.dx==-1) rfsplit"0,3,2,4"
+  if (ldx==-1) rfsplit"0,3,2,4"
-  if (l.dx==1) rfsplit"5,3,7,4"
+  if (ldx==1) rfsplit"5,3,7,4"
-  if (l.dy==-1) rfsplit"3,0,4,2"
+  if (ldy==-1) rfsplit"3,0,4,2"
-  if (l.dy==1) rfsplit"3,5,4,7"
+  if (ldy==1) rfsplit"3,5,4,7"
   camera()
   color()
  end
 
  -- hypothetical
  local time=t()-self.flicker_t
- local flicker_on=time%0.5>0.25
+ if n=="latched" and time>0 and not level:busy() then
- if self:latched() and time>0 and not level:busy() then
+  if time%0.5>0.25 then
-  if flicker_on then
+   for o in all(hypo_ops) do
-   foreach(hypo_ops, function(o)
     local mx0,my0,dmx,dmy=unpack(o)
-    spr(14,(mx0+dmx)*8,(my0+dmy)*8)
+    local px1,py1=(mx0+dmx)*8,(my0+dmy)*8
-   end)
+    spr(14,px1,py1)
    end
-  foreach(hypo_blocks, function(o) 
+  end
+  for o in all(hypo_blocks) do
    local x,y,dx,dy=unpack(o)
-   spr(34,8*x+4*dx,8*y+4*dy,1,1,flicker_on)
+   spr(53,8*x+4*dx,8*y+4*dy,1,1,time%0.5>0.25)
-  end)
+  end
  end
 
  -- debug
@@ -1181,7 +1158,7 @@ function rope:relax()
 
   local adxy,position_new=calc_tension(n0,n1,n2)
   local anch=level:anchor_at_tension(n1,adxy)
-  if not anch then
+  if not anch or _anch_eq(n1,position_new) then
    self:_drag(n1,position_new,{_anch_unpack(n1)})
    _anch_del(n1)
   else n0=n0.next end
@@ -1194,43 +1171,60 @@ function rope:_check_pinch()
 
  local n0=self.src
 
- local qxys={}
+ local qxs,qys={},{}
  while true do 
   local n1=n0.next
   if (not n1) break 
 
   local n0ax,n0ay=_anch_unpack(n0)
   local n1ax,n1ay=_anch_unpack(n1)
-  _rast(qxys,n0ax\0.5,n0ay\0.5,n1ax\0.5,n1ay\0.5) 
+  _rast(qxs,qys,flr(n0ax*2),flr(n0ay*2),flr(n1ax*2),flr(n1ay*2)) 
   n0=n1
  end
 
- local function _possible_tiles(t)
+ local function _possible_tiles(qx,qy)
-  local qx,qy=unpack(qxys[t])
+  local mx0=(qx-1)\2
+  local mx1=qx\2
+  local my0=(qy-1)\2
+  local my1=qy\2
+
   local poss={}
-  for mx=(qx-1)\2,qx\2 do
+  for mx=mx0,mx1 do
-   for my=(qy-1)\2,qy\2 do
+   for my=my0,my1 do
-    if (not level:mcoll{mx,my}) add(poss,{mx,my})
+    add(poss,{mx=mx,my=my})
    end
   end
-  return all(poss)
+  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
  end
 
  -- find cases where i move through an impassable zone
- for i=1,#qxys do
+ for i=1,#qxs do
-  if (not _possible_tiles(i)()) return 
+  if (_blocked(qxs[i],qys[i])) return 
  end
 
  -- find cases where i am cut off diagonally
- for i=3,#qxys do
+ for i=3,#qxs do
-  local qx1,qy1=unpack(qxys[i-1])
+  local qx1,qy1=qxs[i-1],qys[i-1]
-  if (qx1|qy1)&1==0 then
+  if qx1%2==0 and qy1%2==0 then
    local ok
-   for m0 in _possible_tiles(i-2) do
+   for m0 in all(_possible_tiles(qxs[i-2],qys[i-2])) do
-    for m2 in _possible_tiles(i) do
+    for m2 in all(_possible_tiles(qxs[i],qys[i])) do
-     local mx0,my0=unpack(m0)
+     local mx0,my0=m0.mx,m0.my
-     local mx2,my2=unpack(m2)
+     local mx2,my2=m2.mx,m2.my
-     if (mx0==mx2 or my0==my2 or not level:mcoll{mx0,my2} or not level:mcoll{mx2,my0}) ok=true
+     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
     end
    end
 
@@ -1460,6 +1454,10 @@ 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
@@ -1542,19 +1540,22 @@ 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 = {}
+  local ops_to_do,corners={}
   for b in all(blocks_before_trash) do add(blocks, b) end
   if #ops_before_trash>0 then 
-   ops=ops_before_trash
+   ops_to_do=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=ops_after_trash
+   ops_to_do=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
-   foreach(ops, level_tug_crate)
+
+   for o in all(ops) do level:tug_crate(unpack(o)) end
    return true
   end
  end
@@ -1603,19 +1604,18 @@ function rope:_tug(hypothetically)
   end
   
   if not invalid_move then
-   local mv = {mx0,my0,dmx,dmy}
+   if level:can_move(false,mx0,my0,dmx,dmy,1,0) then
-   if level:can_move(false,mv,1,0) then
+    if (hypothetically) return ancs,0,{{mx0,my0,dmx,dmy}},blocks
-    if (hypothetically) return ancs,0,{mv},blocks
 
-    level_tug_crate(mv) 
+    level:tug_crate(mx0,my0,dmx,dmy) 
     return true
    else
-    add(blocks, mv)
+    add(blocks, {mx0,my0,dmx,dmy})
    end
   end
  end
 
- if (hypothetically) return ancs,32767,{},blocks -- invalid
+ if (hypothetically) return ancs,0,{},blocks
  return 
 end
 
@@ -1640,16 +1640,21 @@ function rope:_calc_push(
    smy=-smy
   end
   
-  local dmx=1 -- maybe push right?
+  local mx,dmx
   if anch.adx==-1 and a0.x>an.x+7 then
    -- push left
-   ax0, dmx=ax0-1,-1
+   mx=ax0-1
-  elseif anch.adx!=1 or a0.x>=an.x-7 then
+   dmx=-1
+  elseif anch.adx==1 and a0.x<an.x-7 then
+   -- push right
+   mx=ax0
+   dmx=1
+  else
    return {}
   end
   
   for my=my0,my1,smy do
-   add(ops,{ax0,my,dmx,0})
+   add(ops,{mx,my,dmx,0})
   end
  end
  
@@ -1661,28 +1666,40 @@ function rope:_calc_push(
    smx=-smx
   end
   
-  local dmy=1 -- maybe push down?
+  local my,dmy
   if anch.ady==-1 and a0.y>an.y+6 then
    -- push up
-   ay0,dmy=ay0-1,-1
+   my=ay0-1
-  elseif anch.ady!=1 or a0.y>=an.y-6 then
+   dmy=-1
+   
+  elseif anch.ady==1 and a0.y<an.y-6 then
+   -- push down
+   my=ay0
+   dmy=1
+  else
    return {}
   end
   
   for mx=mx0,mx1,smx do
-   add(ops,{mx,ay0,0,dmy})
+   add(ops,{mx,my,0,dmy})
   end
  end
 
  local ops2,blocked={},{}
  for o in all(ops) do
-  local mx,my=unpack(o)
+  local mx,my,dmx,dmy=unpack(o)
-  if level:mcoll{mx,my} then
+  if not level:mcoll(mx,my) then
-   if (not level:get_crate(mx, my)) break
+   -- great!
-   if not level:can_move(false,o,0,0) then
+  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
+    break
+   end
    add(ops2,o)
   end
  end
@@ -1950,28 +1967,28 @@ __gfx__
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+0000ff000000000000000000efe33e5e11111111e5e33efee5e33efeefe33e5eff1ff1ffffffffffffffffffffffffff88888888555555555555555588888888
-000f00f0000000000aa00aa0efe33eee11ffff11eee33efeeee33effffe33e5eff1ff1ffffffffffffffffffffffffff88888888aa88aa88aa88aa8888888888
+000f00f0000000000aa00aa0efe33eee11ffff11eee33efeeee33effffe33e5eff1ff1ffffffffffffffffffffffffff88888888558855885588558888888888
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-eeee0000cc04405500444400efeeee5e11111111e5eeeefeeeeeeeeeeeeeeeeeffffffffffffffffff1ff1ffffffffff8888888888888888aaaaaaaaaaaaaaaa
+eeee0000cc04405500444400efeeee5e11111111e5eeeefeeeeeeeeeeeeeeeeeffffffffffffffffff1ff1ffffffffff88888888888888885555555555555555
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@@ -2006,38 +2023,38 @@ eeee0000cc04405500444400efeeee5e11111111e5eeeefeeeeeeeeeeeeeeeeeffffffffffffffff
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