aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

2016 Update

Browse source
This commit is contained in:
Tina Müller 2016-12-05 22:15:40 +01:00
parent 948b86eafa
commit dcf5d15da3
7965 changed files with 139854 additions and 31002 deletions
Download patch file Download diff file Expand all files Collapse all files

73
Task/Langtons-ant/REXX/langtons-ant.rexx
View file

@ -1,37 +1,36 @@
/*REXX program implements Langton's ant walk and displays the ant's path*/
parse arg dir char . /*allow specification: ant facing*/
if char=='' then char='#' /*binary colors: 0≡white, 1≡black*/
@.=0 /*define stem array (all white).*/
Lb=1 ; Rb=100 /* left boundry, right boundry.*/
Bb=1 ; Tb=100 /*bottom " top " */
x=(Rb-Lb)%2 ; y=(Tb-Bb)%2 /*approximate center (walk start)*/
if dir=='' then dir=random(1,4) /*ant is facing random direction,*/
$.=1; $.0=4; $.2=2; $.3=3; $.4=4 /*1≡north 2≡east 3≡south 4≡west*/
/*───────────────────────────────────────────ant walks hither & thither.*/
do steps=1 until x<Lb | x>Rb | y<Bb | y>Tb /*walk until out─of─bounds*/
black=@.x.y; @.x.y= \ @.x.y /*ant's cell color code; flip it.*/
if black then dir=dir-1 /*if cell was black, turn left.*/
else dir=dir+1 /* " " " white, turn right.*/
dir=$.dir /*possibly adjust for under/over.*/
select /*ant walks direction it's facing*/
when dir==1 then y= y + 1 /*walking north? Then go "up". */
when dir==2 then x= x + 1 /* " east? " " "right"*/
when dir==3 then y= y - 1 /* " south? " " "down".*/
when dir==4 then x= x - 1 /* " west? " " "left".*/
end /*select*/
end /*steps*/
/*───────────────────────────────────────────the ant is finished walking*/
say center(" Langton's ant walked" steps 'steps. ', 79, "─"); say
/* [↓] show Langton's ant's trail*/
do minx =Lb to Rb /*find leftmost non─blank column.*/
do y=Bb to Tb /*search row by row for the min. */
if @.minx.y then leave minx /*found one, now quit searching. */
end /*y*/
end /*minx*/ /*above code crops left of array.*/
do y=Tb to Bb by -1; _= /*display a plane (row) of cells.*/
do x=minx to Rb; _=_ || @.x.y /*build a cell row for display. */
end /*x*/
_=strip(translate(_,char,10), 'T') /*color the cells: black | white.*/
if _\=='' then say _ /*say line, strip trailing blanks*/
end /*y*/ /*stick a fork in it, we're done.*/
/*REXX program implements Langton's ant walk and displays the ant's path (finite field).*/
parse arg dir char seed . /*obtain optional arguments from the CL*/
if datatype(seed, 'W') then call random ,,seed /*Integer? Then use it as a RANDOM SEED*/
if dir=='' | dir=="," then dir=random(1, 4) /*ant is facing a random direction, */
if char=='' | char=="," then char= '#' /*binary colors: 0≡white, 1≡black. */
parse value scrSize() with sd sw . /*obtain the terminal's depth and width*/
sd=sd-6; sw=sw-1 /*adjust for terminal's useable area. */
x=1000000 ; y=1000000 /*start ant's walk in middle of nowhere*/
$.=1; $.0=4 ; $.2=2; $.3=3; $.4=4 /* 1≡north 2≡east 3≡south 4≡west.*/
@.=0 ; minx=x; miny=y; maxx=x; maxy=y /*define stem array, default: all white*/
/* [↓] ant walks hither and thither. */
do steps=1 until (maxx-miny>sw) | (maxy-miny>sd) /*'til the ant is out─of─bounds.*/
black=@.x.y; @.x.y= \ @.x.y /*invert (flip) ant's cell color code.*/
if black then dir=dir-1 /*if cell color was black, turn left.*/
else dir=dir+1 /* " " " " white, turn right.*/
dir=$.dir /*possibly adjust for under/over. */
select /*ant walks the direction it's facing. */
when dir==1 then y= y + 1 /*is ant walking north? Then go up. */
when dir==2 then x= x + 1 /* " " " east? " " right.*/
when dir==3 then y= y - 1 /* " " " south? " " down. */
when dir==4 then x= x - 1 /* " " " west? " " left. */
end /*select*/
minx=min(minx, x); maxx=max(maxx, x) /*find the minimum and maximum of X. */
miny=min(miny, y); maxy=max(maxy, y) /* " " " " " " Y. */
end /*steps*/
/*finished walking, it's out-of-bounds.*/
say center(" Langton's ant walked " steps ' steps. ', 79, "─")
@.1000000.1000000='█' /*show the ant's initial starting point*/
@.x.y= '∙' /*show where the ant went out-of-bounds*/
/* [↓] show Langton's ant's trail. */
do y=maxy to miny by -1; _= /*display a single row of cells. */
do x=minx to maxx; _=_ || @.x.y /*build a cell row for the display. */
end /*x*/
_=strip( translate(_, char, 10), 'T') /*color the cells: black or white. */
if _\=='' then say _ /*display line (strip trailing blanks).*/
end /*y*/ /*stick a fork in it, we're all done. */