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====== ZZT Enhancer's ZZT-OOP enhancements ======

<WRAP center round todo 60%>
This article is a stub. You can help by reverse-engineering things.
</WRAP>

===== General principles =====

  * ZZT Enhancer commands are prefixed with ''']''. This makes regular ZZT see them as comments, due to the preceding apostrophe. Prefixing the ZZT Enhancer command with ' makes its parser also treat it as a comment.
  * Variables must always be specified in quotes, like ''']add "stones" 1''.

===== Variables =====

TODO (potential names: ''lastmx'', ''lastmy'', ''songpos'', ''songrow'', ''songvol'', ''enhancer'', ''playerx'', ''playery'', ''playerdist'')

===== String IDs =====

^ ID ^ String ^
| 7 | ''Torches:'' |
| 8 | ''   Gems:'' |
| 11 | '' T '' |
| 25 | '' Torch'' |

TODO: Complete list.

===== Commands =====

==== n, s, e, w, ne, sw, se, nw ====

Move while preserving background color.

TODO

==== tn, ts, te, tw, tne, tsw, tse, tnw ====

TODO

==== activate ====

Takes two arguments.

==== add ====

Syntax: ''add "variable" x''

Adds ''x'' to ''"variable"''.

==== addcstat ====

Syntax: ''addcstat ypos color char name "variable"''

Adds a stat to the sidebar, at Y position ''ypos'', with an icon ''color'', ''char'', name ''name'', tracking variable ''"variable"''.

==== allocscreen ====

Syntax: ''allocscreen number_of_screens''

Allocate ''number_of_screens'' screens, addressable from ''0'' to ''number_of_screens - 1''.

==== becomeb ====

Syntax: ''becomeb element color''.

Becomes a statless ''element'' of color ''color''.

==== becomeo ====

Syntax: ''becomeo element_id color ??? ??? ???''

Becomes a statted element with the specified parameters.

==== bgfade ====

Takes four arguments.

==== blinkmode ====

Takes one argument.

==== border ====

Takes one argument.

==== changeb ====

Syntax: ''changeb from_element from_color to_element to_color''.

Changes all instances of a given element ID and color to the other element ID and color. ? may be used as a wildcard in from_color. Faster than ZZT ''#change''.

TODO: Can ? be used elsewhere?

==== charedit ====

Takes three arguments.

==== charid ====

Syntax: ''charid element_id char_id''

Changes the rendering character for ''element_id'' to ''char_id''.

TODO: Does this work on elements with custom rendering logic? (Text, objects, etc.)

==== chstr ====

Syntax: ''chstr string_id contents''

Replaces the string with ID ''string_id'' with ''contents''.

==== color, colour ====

Syntax: ''color x''

Sets the color value of the tile to ''x''.

==== colorxy, colourxy ====

Takes three arguments.

==== cropscreen ====

Syntax: ''cropscreen screen_index x1 y1 width height x2 y2''

TODO

==== defaultpal ====

Takes no arguments.

==== delete ====

Syntax: ''delete "variable"''

Deletes the variable ''"variable"''.

==== deletecstat ====

Seemingly **not implemented** as of Enhancer 0.3b. TODO: Verify

Syntax: ''deletecstat ypos''

Removes the custom stat at ''ypos''.

==== dieitem ====

Syntax: ''dieitem''

Destroys the object and moves stat 0 - the player - to its location.

==== divide ====

Syntax: ''divide "variable" x''

Divides ''"variable"'' by ''x''.

==== dualfont ====

Takes no arguments.

==== dup ====

Takes three or four arguments.

==== enhance ====

Syntax: ''enhance [16-byte lower-case hex value]''

TODO

==== enhancedlogo ====

Takes one argument.

==== eraseplayer ====

Takes no arguments.

==== extern ====

Takes between one and eight arguments.

==== externc ====

Takes between one and eight arguments.

==== freescreen ====

Syntax: ''freescreen''.

Deallocate all allocated screens. The opposite of ''allocscreen''.

==== freewav ====

Takes one argument.

==== global ====

Takes no arguments.

==== goto ====

Takes one argument.

==== if ====

Operators:

  * ''=='' - equal
  * ''!='' - not equal
  * ''>='' - greater than or equal
  * ''<='' - smaller than or equal
  * ''>>'' - greater than
  * ''<<'' - smaller than

==== ifat ====

Syntax: ''ifat x y element color command''.

If, at location ''x'', ''y'', there is an element ''element'' of color ''color'', execute ''command''.

==== ifbup ====

Takes two arguments.

==== ifoat ====

Takes six arguments.

==== ifoup ====

Takes four arguments.

==== jump ====

Takes two arguments.

==== keyvar ====

Takes two arguments.

==== keyvard ====

Takes one argument.

==== loadfont ====

Takes two arguments.

==== loadfontres ====

Takes two arguments.

==== loadpal ====

Takes one argument.

==== loadpalres ====

Takes one argument.

==== loadscreen ====

Takes one argument.

==== loadscreenres ====

Syntax: ''loadscreenres screen_index resource_index''

Loads screen from resource ''resource_index'' to slot ''screen_index''.

==== loadwav ====

Takes two arguments.

==== loadwavres ====

Takes two arguments.

==== lockplayer ====

Takes one argument.

==== mainfont ====

Takes one argument.

==== mod ====

Takes two arguments.

==== mousepoll ====

Takes one argument.

==== moveplayer ====

Syntax: ''moveplayer x y''

Moves the player to location ''x'', ''y''.

==== moveplayerhere ====

Takes no arguments.

==== multiply ====

TODO: Is mul also valid?

Syntax: ''multiply "variable" x''

Multiplies ''"variable"'' by ''x''.

==== playerchar ====

Syntax: ''playerchar char_id''.

Sets the player character to ''char_id''.

==== playercharn, playerchars, playerchare, playercharw ====

Takes one argument.

==== playercol ====

Syntax: ''playercol color''.

Sets the player color to ''color'' (0 - 255).

==== playsong ====

Syntax: ''playsong filename''.

Plays the song ''filename''.

==== playsongres ====

Syntax: ''playsongres resource_index''.

Playes the song at asset index ''resource_index''.

==== playwav ====

Takes five arguments.

==== putblock ====

Syntax: ''putblock x y element color''.

Place a statless ''element'' of color ''color'' at position ''x'', ''y''.

==== putcolor, putcolour ====

Takes three arguments.

==== putmes ====

Takes three arguments.

==== putobj ====

Syntax: ''putobj x y element_id color ??? ??? ???''

Place a statted element with the specified parameters at location ''x'', ''y''.

==== putobjup ====

Syntax: ''putobjup element_id color ??? ??? ???''

TODO

==== putsave ====

Takes five arguments.

==== puttext ====

Syntax: ''puttext x y color text''

Puts the "''text''" string in color ''color'' location ''x'', ''y''.

==== putval ====

Takes four arguments.

==== random ====

Takes two arugments.

==== rel ====

Takes the following types of arguments: ''player'', ''self'', or ''<x> <y>''.

Makes future "x, y" location arguments be calculated relative to the provided target.

==== restorescreen ====

Syntax: ''restorescreen screen_index x y''.

Restores the screen slot ''screen_index'' to (''x'', ''y'').

==== rgb ====

Syntax: ''rgb id r g b''

Set the color ''id'' to color values ''r'', ''g'', ''b'' (range 0-63).

==== savescreen ====

Syntax: ''savescreen screen_index x1 y1 x2 y2''.

Saves the screen area from (''x1'', ''y1'') to (''x2'', ''y2'') to the screen slot ''screen_index''.

==== scrollchar ====

Takes four arguments.

==== secfont ====

Takes one argument.

==== set ====

Syntax: ''set "variable" x''

Sets the variable ''"variable"'' to the value ''x''.

==== setcoli ====

Syntax: ''setcoli c x''

Sets the intensity of color ''c'' to ''x'' (0 - 100).

==== setmusicvol ====

Syntax: ''setmusicvol x''

Sets the music volume to ''x'' (0 - 100).

==== setpali ====

Syntax: ''setpali x''

Sets the global palette intensity to ''x'' (0 - 100).

==== setsongpos ====

Takes one argument.

==== singlefont ====

Takes no arguments.

==== showpal ====

Takes no arguments.

==== statvar ====

Takes two arguments.

==== stopsong ====

Stops the currently playing song.

==== subtract ====

Syntax: ''subtract "variable" x''

Subtracts ''x'' from ''"variable"''.

==== teleport ====

Takes four arguments.

==== uneraseplayer ====

Takes two arguments.

==== unlockplayer ====

Takes no arguments.

==== varstat ====

Takes two arguments.

==== walk ====

Syntax: ''walk x y''

Sets the walking direction to ''x'', ''y''. For instance, ''walk -1 -1'' will cause the object to walk north-west.

==== walkxy ====

Takes four arguments.