mirror of
https://github.com/coding-horror/basic-computer-games.git
synced 2025-12-23 07:29:02 -08:00
337 lines
11 KiB
Perl
Executable File
337 lines
11 KiB
Perl
Executable File
#!/usr/bin/env perl
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use 5.010; # To get 'state' and 'say'
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use strict; # Require explicit declaration of variables
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use warnings; # Enable optional compiler warnings
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use English; # Use more friendly names for Perl's magic variables
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use List::Util qw{ shuffle }; # Shuffle an array.
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use Scalar::Util qw{ looks_like_number };
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use Term::ReadLine; # Prompt and return user input
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our $VERSION = '0.000_01';
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use constant ROW_TPLT => ( '%4d' x 8 ) . "\n";
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print <<'EOD';
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SPLAT
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Creative Computing Morristown, New Jersey
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Welcome to 'Splat' -- the game that simulates a parachute
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jump. Try to open your chute at the last possible
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moment without going splat.
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EOD
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while ( 1 ) {
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say '';
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my $initial_altitude = int( 9001 * rand() + 1000 );
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my $nominal_terminal_velocity;
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if ( get_yes_no( 'Select your own terminal velocity' ) ) {
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$nominal_terminal_velocity = get_input(
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'What terminal velocity (mi/hr)? ',
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sub { looks_like_number( $ARG ) && $ARG > 0 },
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'Please enter a positive number',
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);
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# Convert miles per hour to feet per second
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$nominal_terminal_velocity = $nominal_terminal_velocity * 5280 / 3600;
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} else {
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$nominal_terminal_velocity = int( 1000 * rand() );
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say "OK. Terminal velocity = $nominal_terminal_velocity mi/hr"
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}
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my $terminal_velocity = dither( $nominal_terminal_velocity );
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my $nominal_gravity; # Acceleration due to gravity
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if ( get_yes_no( 'Want to select acceleration due to gravity' ) ) {
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} else {
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state $body = [
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[ q<Fine. You're on Mercury. Acceleration = 12.2 ft/sec/sec.>,
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12.2 ],
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[ q<All right. You're on Venus. Acceleration = 28.3 ft/sec/sec.>,
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28.3 ],
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[ q<Then you're on Earth. Acceleration = 32.16 ft/sec/sec.>,
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32.16 ],
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[ q<Fine. You're on the Moon. Acceleration = 5.15 ft/sec/sec.>,
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5.15 ],
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[ q<All right. You're on Mars. Acceleration = 12.5 ft/sec/sec.>,
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12.5 ],
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[ q<Then you're on Jupiter. Acceleration = 85.2 ft/sec/sec.>,
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85.2 ],
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[ q<Fine. You're on Saturn. Acceleration = 37.6 ft/sec/sec.>,
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37.6 ],
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[ q<All right. You're on Uranus. Acceleration = 33.8 ft/sec/sec.>,
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33.8 ],
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[ q<Then you're on Neptune. Acceleration = 39.6 ft/sec/sec.>,
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39.6 ],
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[ q<Fine. You're on the Sun. Acceleration = 896 ft/sec/sec.>,
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896 ],
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];
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my $pick = $body->[ rand scalar @{ $body } ];
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say $pick->[0];
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$nominal_gravity = $pick->[1];
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}
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my $gravity = dither( $nominal_gravity );
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print <<"EOD";
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Altitude = $initial_altitude ft
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Term. velocity = $nominal_terminal_velocity ft/sec +/- 5%
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Acceleration = $nominal_gravity ft/sec/sec +/- 5%
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Set the timer for your freefall
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EOD
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my $drop_time = get_input(
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'How many seconds? ',
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sub { m/ \A [0-9]+ \z /smx },
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"Please enter an unsigned integer\n",
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);
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print <<'EOD';
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Here we go.
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Time (sec) Dist to fall (ft)
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========== =================
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EOD
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if ( defined( my $altitude = make_jump(
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$initial_altitude,
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$gravity,
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$terminal_velocity,
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$drop_time ) )
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) {
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# Successful jump
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state $succesful = [];
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state $ordinal = [ qw{ 1st 2nd 3rd } ];
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if ( defined( my $ord = $ordinal->[ @{ $succesful } ] ) ) {
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say "Amazing!!! Not nad for your $ord successful jump!!!";
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} else {
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my $jumps = @{ $succesful };
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my $worse = grep { $_ > $altitude } @{ $succesful };
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my $fractile = 1 - $worse / $jumps;
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my $better = $jumps - $worse;
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if ( $fractile <= 0.1 ) {
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print <<"EOD";
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Wow! That's some jumping. Of the $jumps successful jumps
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before yours, only $better opened their chutes lower than
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you did.
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EOD
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} elsif ( $fractile <= 0.25 ) {
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print <<"EOD";
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Pretty good! $jumps successful jumps preceded yours and only
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$better of them got lower than you did before their chutes
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opened.
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EOD
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} elsif ( $fractile <= 0.5 ) {
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print <<"EOD";
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Not bad. There have been $jumps successful jumps before yours.
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You were beaten out by $better of them.
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EOD
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} elsif ( $fractile <= 0.75 ) {
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print <<"EOD";
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Conservative, aren't you? You ranked only $better in the
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$jumps successful jumps before yours.
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EOD
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} elsif ( $fractile <= 0.9 ) {
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print <<"EOD";
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Humph! Don't you have any sporting blood? There were
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$jumps successful jumps before yours and you came in $worse jumps
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better than the worst. Shape up!!!
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EOD
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} else {
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print <<"EOD";
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Hey! You pulled the rip cord much too soon. $jumps successful
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jumps before yours and you came in number $better! Get with it!
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EOD
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}
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}
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push @{ $succesful }, $altitude;
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} else {
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# Splat
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say q<I'll give you another chance.>;
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}
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next if get_yes_no( 'Do you want to play again' );
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next if get_yes_no( 'Please' );
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print <<'EOD';
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Ssssssssss.
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EOD
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last;
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}
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# Return the first argument modified by up to plus or minus some
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# fraction specified by the second argument (default 0.05)
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sub dither {
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my ( $arg, $fract ) = @_;
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$fract //= 1 / 20;
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return $arg + ( $arg * rand() * $fract ) - ( $arg * rand() * $fract );
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}
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use constant FORMAT_FALL => "%10.1f %10d\n";
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use constant FORMAT_SPLAT => "%10.1f %s\n";
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sub make_jump {
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my ( $initial_altitude, $gravity, $terminal_velocity, $drop_time ) = @_;
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my $altitude;
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foreach my $step ( 0 .. 8 ) {
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my $time = $step * $drop_time / 8;
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if ( $time > $terminal_velocity / $gravity ) {
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# Terminal velocity reached
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printf "Terminal velocity reached at T plus %.2f seconds.\n",
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$terminal_velocity / $gravity;
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for my $step ( $step .. 8 ) {
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my $time = $step * $drop_time / 8;
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$altitude = $initial_altitude - (
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$terminal_velocity * $terminal_velocity /
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( 2 * $gravity ) + $terminal_velocity * (
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$time - $terminal_velocity / $gravity ) );
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if ( $altitude > 0 ) {
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printf FORMAT_FALL, $time, $altitude;
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} else {
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splat(
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$terminal_velocity / $gravity + (
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$initial_altitude -
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$terminal_velocity * $terminal_velocity /
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( 2 * $gravity ) ) / $terminal_velocity,
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);
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return;
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}
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}
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last;
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} else {
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$altitude = $initial_altitude - $gravity / 2 * $time * $time;
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if ( $altitude > 0 ) {
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printf FORMAT_FALL, $time, $altitude;
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} else {
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splat( sqrt( 2 * $initial_altitude / $gravity ) );
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return;
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}
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}
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}
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say 'Chute open.';
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return $altitude;
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}
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sub splat {
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my ( $time ) = @_;
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printf FORMAT_SPLAT, $time, 'Splat!';
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state $rip = [
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q<Requiescat in pace.>,
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q<May the angel of heaven lead you into paradise.>,
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q<Rest in peace.>,
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q<Son-of-a-gun.>,
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q<#$%&&%!$>,
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q<A kick in the pants is a boost if you're headed right.>,
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q<Hmmm. Should have picked a shorter time.>,
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q<Mutter. Mutter. Mutter.>,
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q<Pushing up daisies.>,
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q<Easy come, easy go.>,
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];
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say $rip->[ rand scalar @{ $rip } ];
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return;
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}
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# Get input from the user. The arguments are:
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# * The prompt
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# * A reference to validation code. This code receives the response in
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# $ARG and returns true for a valid response.
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# * A warning to print if the response is not valid. This must end in a
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# return.
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# The first valid response is returned. An end-of-file terminates the
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# script.
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sub get_input {
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my ( $prompt, $validate, $warning ) = @ARG;
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# If no validator is passed, default to one that always returns
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# true.
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$validate ||= sub { 1 };
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# Create the readline object. The 'state' causes the variable to be
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# initialized only once, no matter how many times this subroutine is
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# called. The do { ... } is a compound statement used because we
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# need to tweak the created object before we store it.
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state $term = do {
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my $obj = Term::ReadLine->new( 'reverse' );
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$obj->ornaments( 0 );
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$obj;
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};
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while ( 1 ) { # Iterate indefinitely
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# Read the input into the topic variable, localized to prevent
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# Spooky Action at a Distance. We exit on undef, which signals
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# end-of-file.
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exit unless defined( local $ARG = $term->readline( $prompt ) );
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# Return the input if it is valid.
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return $ARG if $validate->();
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# Issue the warning, and go around the merry-go-round again.
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warn $warning;
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}
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}
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# Get a yes-or-no answer. The argument is the prompt, which will have
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# '? [y/n]: ' appended. The donkey work is done by get_input(), which is
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# requested to validate the response as beginning with 'y' or 'n',
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# case-insensitive. The return is a true value for 'y' and a false value
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# for 'n'.
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sub get_yes_no {
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my ( $prompt ) = @ARG;
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state $map_answer = {
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n => 0,
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y => 1,
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};
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my $resp = lc get_input(
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"$prompt? [y/n]: ",
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sub { m/ \A [yn] /smxi },
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"Please respond 'y' or 'n'\n",
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);
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return $map_answer->{ substr $resp, 0, 1 };
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}
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__END__
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=head1 TITLE
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splat.pl - Play the game 'splat' from Basic Computer Games
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=head1 SYNOPSIS
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splat.pl
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=head1 DETAILS
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This Perl script is a port of C<splat>, which is the 73rd entry in
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Basic Computer Games.
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This is a very basic port. All I really did was untangle the spaghetti.
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=head1 PORTED BY
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Thomas R. Wyant, III F<wyant at cpan dot org>
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=head1 COPYRIGHT AND LICENSE
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Copyright (C) 2022 by Thomas R. Wyant, III
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This program is free software; you can redistribute it and/or modify it
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under the same terms as Perl 5.10.0. For more details, see the Artistic
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License 1.0 at
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L<https://www.perlfoundation.org/artistic-license-10.html>, and/or the
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Gnu GPL at L<http://www.gnu.org/licenses/old-licenses/gpl-1.0.txt>.
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This program is distributed in the hope that it will be useful, but
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without any warranty; without even the implied warranty of
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merchantability or fitness for a particular purpose.
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=cut
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# ex: set expandtab tabstop=4 textwidth=72 :
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