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This page uses content from Wikipedia. The original article was at Robots_(1984_video_game). The list of authors can be seen in the page history. As with Rosetta Code, the text of Wikipedia is available under the GNU FDL. (See links for details on variance)

The task is to implement a clone of Ken Arnold's turn-based game Robots.

Simple game where its only objective is to escape from a number of robots, which have been programmed to kill the player.

C++

See Robots/C++.

Common Lisp

See Robots/Common Lisp.

Go

See Robots/Go.

J

This approximately emulates the bsd robots game. There's a few differences (the game board is larger and has an explicitly displayed junk border, to quit early you close the window, ...), but the fundamental mechanics and display should be pretty close.

We use two callbacks here: 'game_handler' to capture keyboard events, and 'sys_timer_z_' to capture timer events when the user uses the 'wait for game over' option.

require'~addons/ide/qt/gl2.ijs'
coinsert'jgl2'

move_handler=: {{
  if. 'char'-:systype do.wd'timer 0'
    select.{.tolower sysdata
      case.'y'do.move _1 _1
      case.'k'do.move  0 _1
      case.'u'do.move  1 _1
      case.'h'do.move _1  0
      case.' 'do.move  0  0
      case.'l'do.move  1  0
      case.'b'do.move _1  1
      case.'j'do.move  0  1
      case.'n'do.move  1  1
      case.'w'do.giveup''
      case.'t'do.teleport''
    end.
  end.
}}

Directions=:({.~ i.&'0'){{)n
Directions:

y k u
 \|/
h- -l
 /|\
b j n

Commands:

w: wait for end
t: teleport

Legend:

+: robot
*: junk heap
@: you

Score: 0
}}

query_handler=: {{game_handler=: m&{{if.'char'-:systype do.x`]@.('ny'i.{.sysdata)0 end.}}}}
teleport=: {{move (dim#:?*/dim)-player}}
start=: {{initlevel 1[score=: 0}}
advance=: {{initlevel level+1}}
color=: [ gltextcolor@glrgb@{{<.0.5+255*y}}
at=: (gltext@[ [ gltextxy@])"1
dim=: 110 72
has=: +./ .=

showscore=: {{
  t=. ];._2 LF,~Directions,":y
  t at"_1] 1130,.14*2+i.#t
  botrow=. I. '+' e."1 >t
  '+' at 1130,14*2+botrow color 1 0 0  
  '*' at 1130,14*3+botrow color 1 0 1*0.5
  '@' at 1130,14*4+botrow color 0 1 0.75
}}

initlevel=: {{
  game_handler=: move_handler
  junk=:(#~ has&(dim-1) +. has&0)dim#:i.*/dim
  'player bots'=: ({.;}.) 1+(dim-2) #: (1+10*y) ? */dim-2
  drawboard level=: y
}}

drawboard=: {{
  glclear''
  glfont '"courier" 12' 
  showscore score   color 0 0 0
  '+' at 10*bots    color 1 0 0
  '*' at 10*junk    color 1 1 0*0.5
  '@' at 10*player  color 0 1 0*0.75
  glpaint''
}}

move=: {{
  player=: player+y
  'hazards crashes'=.(~.;1<#/.~) (2#junk),bots-*bots-"1 player
  junk=: hazards#~crashes
  bots=: hazards#~crashes=0
  score=: level#.5 5,-#bots
  drawboard''
  if.player e.junk,bots do.lose''
  elseif.0=#bots do.win'' end.
}}

lose=: {{
  wd'timer 0'
  glfont '"courier" 96'
  game_handler=: quit`start query_handler
  'Game Over' at 320 320  color 1 0 0
  glfont '"courier" 24'
  'Start over? (y/n)' at 480 480 color 0 0 0
}}

win=: {{
  glfont '"courier" 96'
  game_handler=: quit`advance query_handler
  'You Win' at 320 320  color 0 1 0
  glfont '"courier" 24'
  'Continue? (y/n)' at 480 480 color 0 0 0
}}

giveup=: {{
  sys_timer_z_=: {{move_base_ 0 0}}
  wd'timer 100'
}}

wd'pc game closeok; setp wh 1280 720; cc chase isidraw flush;pshow'
start''

Java

See Robots/Java.

Julia

See Robots/Julia

Kotlin

See Robots/Kotlin.

Phix

See Robots/Phix.

Raku

(formerly Perl 6) The bots single-mindedly chase you, taking the shortest path, ignoring obstacles. Use arrow keys to navigate your character(╂) around the board. Avoid bots(☗) and hazards(☢). "Kill" bots by causing them to crash into hazards or other bots. A dead bot creates another hazard. If you eliminate all of the bots on the board, another wave will spawn in random positions. If you touch a hazard or are touched by a bot, you die(†).

use Term::termios;

constant $saved   = Term::termios.new(fd => 1).getattr;
constant $termios = Term::termios.new(fd => 1).getattr;
# raw mode interferes with carriage returns, so
# set flags needed to emulate it manually
$termios.unset_iflags(<BRKINT ICRNL ISTRIP IXON>);
$termios.unset_lflags(< ECHO ICANON IEXTEN ISIG>);
$termios.setattr(:DRAIN);

# reset terminal to original settings and clean up on exit
END { $saved.setattr(:NOW);  print "\e[?25h\n" }

print "\e[?25l"; # hide cursor

my %dir = (
   "\e[A" => 'up',
   "\e[B" => 'down',
   "\e[C" => 'right',
   "\e[D" => 'left',
);

my $x = 100; # nominal "board" width
my $y = 40;  # nominal "board" height

my $human = "\e[0;92m╂\e[0m"; # various
my $robot = "\e[0;91m☗\e[0m"; # entity
my $block = "\e[0;93m☢\e[0m"; # sprite
my $dead  = "\e[1;37m†\e[0m"; # characters
my $wall  = "\e[1;96m█\e[0m";
my $blank = ' ';

my $numbots = 10; # number of bots in each round

# blank playing field
my @scr = flat $wall xx $x, ($wall, $blank xx $x - 2, $wall) xx $y - 2, $wall xx $x;

# put player on board
my $me;
loop {
    $me = ($x+2 .. ($x - 1 ) * $y).roll;
    last if @scr[$me] eq $blank;
}
@scr[$me] = $human;

# Put an assortment of hazards on board
for ^20 {
    my $s = (^$x*$y).pick;
    if @scr[$s] eq $blank { @scr[$s] = $block } else { redo }
}

my $info  = 0;
my $score = 0;

newbots(); # populate board with a fresh wave of bots

loop {
    print "\e[H\e[J";
    print "\e[H";
    print join "\n", @scr.rotor($x)».join;
    print "\nSurvived " , $info , ' bots';

    # Read up to 4 bytes from keyboard buffer.
    # Page navigation keys are 3-4 bytes each.
    # Specifically, arrow keys are 3.
    my $key = $*IN.read(4).decode;

    move %dir{$key} if so %dir{$key};
    movebots();
    last if $key eq 'q'; # (q)uit
}

proto sub move (|) {*};

multi move ('up') {
    if @scr[$me - $x] ne $wall {
        expire() if @scr[$me - $x] ne $blank;
        @scr[$me] = $blank;
        $me = $me - $x;
        @scr[$me] = $human;
    }
}
multi move ('down') {
    if @scr[$me + $x] ne $wall {
        expire() if @scr[$me + $x] ne $blank;
        @scr[$me] = $blank;
        $me = $me + $x;
        @scr[$me] = $human;
    }
}
multi move ('left') {
   if @scr[$me - 1] ne $wall {
        expire() if @scr[$me - 1] ne $blank;
        @scr[$me] = $blank;
        $me = $me - 1;
        @scr[$me] = $human;
    }
}

multi move ('right') {
    if @scr[$me + 1] ne $wall {
        expire() if @scr[$me + 1] ne $blank;
        @scr[$me] = $blank;
        $me = $me + 1;
        @scr[$me] = $human;
    }
}

sub newbots {
    for ^$numbots {
        my $s = (^$x*$y).pick;
        if @scr[$s] eq $blank {
            @scr[$s] = $robot;
        } else {
            redo
        }
    }
}

sub movebots {
    my $mx = $me % $x;
    my $my = $me div $x;
    my @bots = @scr.grep: * eq $robot, :k;
    for @bots -> $b {
        my $bx = $b % $x;
        my $by = $b div $x ;
        if ($mx - $bx).abs < ($my - $by).abs {
            $by += ($my - $by) < 0 ?? -1 !! 1;
        } else {
            $bx += ($mx - $bx) < 0 ?? -1 !! 1;
        }
        my $n = $by * $x + $bx;
        if @scr[$n] eq $robot {
            @scr[$b] = @scr[$n] = $block;
        } elsif @scr[$n] eq $block {
            @scr[$b] = $block;
        } elsif $n == $me {
            expire()
        } else {
            @scr[$b] = $blank;
            @scr[$n] = $robot;
        }
    }
    unless +@bots > 0 {
        newbots();
        $score += $numbots;
    }
    $info = $score + $numbots - @scr.grep: * eq $robot;
}

sub expire {
    @scr[$me] = $dead;
    print "\e[H\e[J";
    print "\e[H";
    print join "\n", @scr.rotor($x)».join;
    print "\nSurvived " , $info , ' bots, but succumbed in the end.';
    exit
}

Sample game:

████████████████████████████████████████████████████████████████████████████████████████████████████
█                                                                                                  █
█                                               ☗                                                  █
█                                 ☢☢                                                               █
█                             †    ☢       ☢                                  ☢                    █
█          ☢                  ☢☢☢☢☢☢                                                               █
█       ☢☢☢☢☢☢☢                ☢☢☢☢☢☢☢                                                             █
█               ☢☢☢☢           ☢  ☢☢                              ☢☢☢                              █
█             ☢☢☢☢☢               ☢☢                                                               █
█            ☢☢☢☢☢☢☢☢             ☢☢☢                        ☢☢☢                                   █
█             ☢ ☢☢☢☢                ☢                                                              █
█              ☢☢☢                                                                                 █
█                                              ☗                                                   █
█               ☢☢☢ ☢                                                                              █
█               ☢☢☢☢☢☢                                                                             █
█                ☢☢☢☢☢☢☢☢                                                                          █
█               ☢☢☢☢☢☢ ☢☢                                                                          █
█               ☢☢☢☢☢☢☢☢                   ☗                                                       █
█               ☢☢☢☢☢☢☢      ☢                                 ☢                                   █
█                 ☢☢ ☢       ☢☢                                                                    █
█                  ☢ ☢       ☢         ☢☢                                                          █
█                 ☢☢                   ☢                                                           █
█           ☢                          ☢                                                           █
█           ☢                                                                                      █
█           ☢                                                                                      █
█                                                                                                  █
█                                                                        ☢                      ☢  █
█                                                                                                  █
█                                                                                                  █
█                                                                                                  █
█                                                                                             ☢    █
█                                                                             ☢             ☢      █
█                                                        ☢                                         █
█                                                                                                  █
█                                                                                                  █
█                                           ☢☢                                                     █
█                                           ☢                                                      █
█                                                                                                  █
█            ☢☢                                                                                    █
████████████████████████████████████████████████████████████████████████████████████████████████████
Survived 117 bots, but succumbed in the end.

Wren

See Robots/Wren.