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\begin{document}

\raggedright
\footnotesize
\begin{multicols}{2}

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\begin{center}
\Large{\textbf{Enigma Level API II}} \\
\large{\textbf{task driven approach}} \\
\end{center}

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\section*{Position Tasks}

\subsection*{Creating Positions}
\begin{tabular}{@{}ll@{}}
\verb!pos = po(7, 3)!      & "po()" to generate a position \\
\verb!pos = po({7, 3})!    & using a table as argument \\
\verb!pos = obj!           & every object is a valid position \\
\verb!pos = po(12.3, 3.7)! & a position within a grid (for an actor)
\end{tabular}

\subsection*{Position Constants}
\begin{tabular}{@{}ll@{}}
\verb!{7,3}! & valid position for all arguments and operations
\end{tabular}

\subsection*{Coordinate Access}
\begin{tabular}{@{}ll@{}}
\verb!x,y = pos.x, pos.y!           & member access \\
\verb!x,y = pos["x"], pos["y"]!     & member access \\
\verb!x,y = pos:xy()!               & \\
\verb!x,y = obj.x, obj.y!           & works on objects too \\
\verb!x,y = obj:xy()!               &
\end{tabular}

\subsection*{Position Calculation}
\begin{tabular}{@{}ll@{}}
\verb!pos = obj + {2,7}!         & adding offset \\
\verb!dpos = obj1 - obj2!        & difference vector \\
\verb!dpos2 = 2 * dpos!          & scalar multiplication \\
\verb!dpos3 = dpos / 2!          & \\
\verb!dpos3 = (obj1 - obj2) / 2! & middle between objects
\end{tabular}

\subsection*{Center positions for set actors}
\begin{tabular}{@{}ll@{}}
\verb!pos_centered1 = pos + {0.5, 0.5 }! & by offset \\
\verb!pos_centered2 = #pos!              & by special feature \\
\verb!pos_centered3 = #obj!              &
\end{tabular}

\subsection*{Round a position to a grid}
\begin{tabular}{@{}ll@{}}
\verb!grid_pos = pos:grid()!                & to integer coordinates \\
\verb!grid_pos = ((pos1 - pos2)/2):grid()!  &
\end{tabular}

\subsection*{Position comparison}
\begin{tabular}{@{}ll@{}}
\verb!pos_centered1 == pos_centered2! & Lua's equality operator \\
\verb!pos_centered1 ~= pos_centered2! & Lua's inequality operator
\end{tabular}

\subsection*{Position existence}
\begin{tabular}{@{}ll@{}}
\verb!pos:exists()! &
\end{tabular}

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\section*{Attribute Tasks}

\subsection*{Single Attribute Setting}
\begin{tabular}{@{}ll@{}}
\verb!obj["destination"] = po(7,3)!  & simple object attribute \\
\verb!wo["Brittleness"] = 7.0!       & global world attribute \\
\verb!obj["_myattribute"] = "what"!  & userattribute                % ??
\end{tabular}

\subsection*{Multiple Attribute Setting}
\begin{tabular}{@{}ll@{}}
\verb!obj:set({target=mydoor, action="open"})! & set multiple attributes
\end{tabular}

\subsection*{Requesting Attributes}
\begin{tabular}{@{}ll@{}}
\verb!value = obj["attr_name"]!             & get the value \\
\verb!value = obj.attr_name!                & \\
\verb!value = wo["Brittleness"]!            & get the value of a global level constant \\
\verb!if wo["IsDifficult"] then ... end!    & often used difficult-mode switch
\end{tabular}

\subsection*{Reset Attributes}
\begin{tabular}{@{}ll@{}}
\verb!obj["length"] = nil!     & the default length, e.g. '1' \\
\verb!obj["color"] = nil!      & delete color attribute - no color \\
\verb!obj["length"] = DEFAULT! & the default length, e.g. '1'
\end{tabular}

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\section*{Object Tasks}

\subsection*{Creating Objects}
\begin{tabular}{@{}ll@{}}
\verb!wo[pos] = {"st_chess", color=WHITE, name="Atrax"}! & on grid pos \\
\verb!wo[#pos] = {"ac_bug"}!             & actor centered on grid pos \\
\verb!wo[pos] = {"#ac_bug"}!             & actor centered on grid pos \\
\verb!wo[pos] = {"ac_bug", 0.3, 0.7}!    & actor with offsets to pos \\
\verb!wo[my_floor] = {"it_magicwand"}!   & set an wand on top of a given floor obj \\
\verb!wo[pos] = ti["x"]!                 & tile based object definition
\end{tabular}

\subsection*{Object Naming}
\begin{tabular}{@{}ll@{}}
\verb!no["Atrax"] = obj!                            & \\
\verb!wo[pos] = {"st_chess", name="Atrax"}!         & \\
\verb!wo[pos] = {"st_chess", "Atrax", color=WHITE }!&
\end{tabular}

\subsection*{Object Autonaming}
Each new object will have a unique name. \\
\begin{tabular}{@{}ll@{}}
\verb!wo[pos] = {"st_chess", name="Atrax#"}! & autonamed chesstones
\end{tabular}

\subsection*{Requesting Objects}
\begin{tabular}{@{}ll@{}}
\verb!obj = no["Atrax"]!        & named object retrieval from repository \\
\verb!obj = fl(pos)!            & floor at pos \\
\verb!obj = it(x,y)!            & item at pos \\
\verb!obj = st(pos)!            & stone at pos \\
\verb!obj = wo:it(pos)!         & item at pos \\
\verb!my_item = it(my_floor)!   & get the item that is on top of the given floor
\end{tabular}

\subsection*{Killing Objects}
\begin{tabular}{@{}ll@{}}
\verb!wo[pos] = {"it_nil"}! & \\
\verb!obj:kill()!           & be carefull with kill
\end{tabular}

\subsection*{Comparing Objects}
\begin{tabular}{@{}ll@{}}
\verb!obj1 == obj2! & \\
\verb!obj1 ~= obj2! &
\end{tabular}

\subsection*{Existence of an object}
\begin{tabular}{@{}ll@{}}
\verb!obj:exists()!     & object exists? \\
\verb!-obj!             & unary minus operator on object \\
\verb!if -obj then ...! &
\end{tabular}

\subsection*{Messages}
\begin{tabular}{@{}ll@{}}
\verb!my_boulder:message("orientate", WEST)! & \\
\verb!my_boulder:orientate(EAST)!            & \\
\verb!my_door:open()!
\end{tabular}

\subsection*{Object Classification}
\begin{tabular}{@{}ll@{}}
\verb!obj:is("st_chess")!       & \\
\verb!obj:is("st")!             & \\
\verb!obj:is("st_chess_black")! &
\end{tabular}

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\section*{Group Tasks}

\subsection*{Creating Groups}
\begin{tabular}{@{}ll@{}}
\verb!group = no["Atrax#*"]!            & a group of all matching objects, wildcards "*","?" allowed \\
\verb!group = grp(obj1, obj2, obj3)!    & a group of several objects \\
\verb!group = grp({obj1, obj2, obj3})!  & a group of objects set up in a table \\
\verb!group = grp()!                    & an empty group
\end{tabular}

\subsection*{Group Usage}
\begin{tabular}{@{}ll@{}}
\verb!floor_group["friction"] = 3.2!    & set attribute on all floors in the grou \\
\verb!door_group:message("open")!       & send message to all members \\
\verb!door_group:open()!                & open all doors in the group \\
\verb!stone_group:kill()!               & \\
\verb!wo[floor_group] = {"it_coin_m"}!  & add some money on all floor positions
\end{tabular}
\begin{tabular}{@{}ll@{}}
\verb!wo[pos] = {"st_switch", target=door_group, action="open"}! & multitargets \\
\verb!wo[pos] = {"st_switch", target="door#*", action="close"}!  &
\end{tabular}

\subsection*{Group Operations}
\begin{tabular}{@{}ll@{}}
\verb!doors_lasers = doorgrp + lasergrp!     & join of two groups \\
\verb!lasergrp     = doors_lasers - doorgrp! & difference of two groups \\
\verb!common_doors = doorgrp1 * doorgrp2!    & intersection of two groups
\end{tabular}

\subsection*{Group Members}
\begin{tabular}{@{}ll@{}}
\verb!count = #mygroup!      & -- number of objects in the group \\
\verb!obj   = mygroup[5]!    & -- 5th object of the group \\
\verb!obj   = mygroup[-1]!   & -- last object of the group \\
\verb!for i = 1, #mygroup do obj = mygroup[i] ... end! & \\
\verb!for obj in mygroup do ... end! & \\
\end{tabular}

\subsection*{Shuffled Group}
\begin{tabular}{@{}ll@{}}
\verb!shuffled_group = sorted_group:shuffle()!  & \\
\verb!shuffled_group = no["Atrax#*"]:shuffle()! &
\end{tabular}

\subsection*{Sorted Group}
\begin{tabular}{@{}ll@{}}
\verb!sorted_group = group:sort("linear", po(2, 1))! & \\
\verb!sorted_group = group:sort("linear")! & \\
\verb!sorted_group = group:sort("circular")! & \\
\verb!sorted_group = group:sort()! &
\end{tabular}

\subsection*{Subset Group}
\begin{tabular}{@{}ll@{}}
\verb!sub_group = group:sub(2)!     & -- first two objects \\
\verb!sub_group = group:sub(-2)!    & -- last two objects \\
\verb!sub_group = group:sub(2, 4)!  & -- objects from 2 to 4 \\
\verb!sub_group = group:sub(2, -2)! & -- two objects starting with 2
\end{tabular}

\subsection*{Nearest Object}
\begin{tabular}{@{}ll@{}}
\verb!object = group:nearest(reference)! &
\end{tabular}

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\section*{Tiles}

\subsection*{Tiles}
\begin{tabular}{@{}ll@{}}
\verb!ti["_"] = {"fl_sahara"}!  & simple tile \\
\verb!ti["__"] = {"fl_sahara"}! & two char tile \\
\verb!ti[".."] = {"fl_sand"}!   & \\
\verb!ti["##"] = {"st blocker"}! &
\end{tabular}
\begin{tabular}{@{}ll@{}}
\verb!ti["switch_template"] = {"st_switch"}! & tiles can hav arbitrary names too \\
\verb!ti[".."] = {"fl_abyss"}!               & redefinition causes error \\
\verb!ti[".w"] = ti[".."] .. {"it_magicwand"}! & concatenation of several tiles possible \\
\verb!ti[" w"] = {"fl_abyss"} .. ti({"it_magicwand"})! & \\
\end{tabular}


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\section*{Named Positions Tasks}
\subsection*{Named Position Usage}
\begin{tabular}{@{}ll@{}}
\verb!obj["name"] = "anchor1"! & \\
\verb!obj:kill()!              & \\
\verb!pos = po["anchor1"]!     & position still available \\
\verb!po["anchor2"] = pos!     &
\end{tabular}

\subsection*{Creating Position Lists}
\begin{tabular}{@{}ll@{}}
\verb!polist = po["deepwater#*"]! & positionlist with pos \\
\verb!polist = po(grp)!           & of all group objects
\end{tabular}

\subsection*{Position List Usage}
\begin{tabular}{@{}ll@{}}
\verb!wo[polist] = ti["x"]! & \\
\verb!grp = fl(polist)!     &
\end{tabular}

\subsection*{Position List Operations}
\begin{tabular}{@{}ll@{}}
\verb!wo[polist .. po["beach#*"]] = {"it_banana"}!
\end{tabular}

\subsection*{Position List Members}
\begin{tabular}{@{}ll@{}}
\verb!for i = 1, #pogrp do! & iterate over polist \\
\verb!    wo[polist[i]] = {"it_cherry"}! \\
\verb!end!
\end{tabular}

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\section*{Other}
\subsection*{Nearest Object}
\begin{tabular}{@{}ll@{}}
\verb!ti["F"] = {"st_floppy", target="@door#*"}! & target is always the nearest door \\
\verb!ti["B"] = {"st_blocker", name="door#"}!    & resolved at levelloadtime
\end{tabular}
\begin{tabular}{@{}ll@{}}
\verb!ti["o"] = {"#ac_pearl_white", "s#", owner=DEFAULT}! & target is always the currently nearest actor \\
\verb!ti["q"] = {"it_rubberband", anchor2="@@s#*"}!       & resolved at runtime when needed
\end{tabular}

\subsection*{Callbacks from switchlike objects}
\verb!function my_callback(value, sender) ... end!
Sender is the senderobject, value it's state.

\subsection*{Checkerboard floor}
\verb!ti["x"] = ti({"fl_rough_red", checkerboard=0}) .. {"fl_rough_blue", checkerboard=1}!


\section*{World}
\subsection*{World Initialization}
\verb!width, height = wo(topresolver, defaultkey, map)!
\verb!width, height = wo(topresolver, defaultkey, width, height)!

\subsection*{World Advanced Methods}
\verb!wo:add(tile_declarations)!
\verb!wo:add(target, tile_declarations)!

\verb!wo:drawBorder(upperleft_edge, lowerright_edge, tile)!
\verb!wo:drawBorder(upperleft_edge, width, height, tile)!

\verb!wo:drawMap(resolver, anchor, ignore, map, [readdir])!
\verb!wo:drawMap(resolver, anchor, libmap-map, [readdir])!

\verb!wo:drawRect(upperleft_edge, lowerright_edge, tile)!
\verb!wo:drawRect(upperleft_edge, width, height, tile)!

\verb!wo:shuffleOxyd(rules)! \\
\verb!wo:shuffleOxyd()!
\verb!wo:shuffleOxyd({no["borderoxyds#*"]:sort("circular"), circular=true})!
\verb!wo:shuffleOxyd({"leftoxyds#*","rightoxyds#*", min=3, max=5})!

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\section*{Resolvers}
\subsection*{Autotiling}
\verb!res.autotile(subresolver, rules)!
\verb!res.autotile(ti, {"A", "template_switch"}, {"L", "template_laser})!
\verb!res.autotile(ti, {"a", "e", "template_trigger}, {"A", "E", "template_door"})!

\subsection*{Composer}
\verb!res.composer(subresolver)!
\verb!res.composer(subresolver, sequence)!
\begin{tabular}{@{}ll@{}}
\verb!res.composer(ti)!         & \\
\verb!res.composer(ti, "211")!  & decompose the last two chars together
\end{tabular}

\subsection*{Puzzler}
load the library before use:
\verb!<el:dependency el:path="lib/libpuzzle"!
\verb! el:id="lib/libpuzzle" el:release="3" el:preload="true"/>!
\verb!res.puzzle(subresolver, rules)!
\begin{tabular}{@{}ll@{}}
\verb!res.puzzle(ti, "B", "Y", "I", "M")!  & Don't forget appr. tile declarations
\end{tabular}

\subsection*{Random}
\verb!res.random(subresolver, hits, replacements)!
\verb!res.random(ti, "x", {"a", "b"})!
\verb!res.random(ti, {{"x", "y"},{"i","j"}}, {{"a", 2}, {"b", 1}})!

\subsection*{Custom Resolver}
\verb!tile = myresolver(key, x, y)!

\begin{center}
\rule{0.6\linewidth}{0.25pt} \\
Compiled from Enigma 1.21 reference manual by Raoul
\end{center}

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