Launch rocket with countdown and acceleration in stdout

From Rosetta Code
Launch rocket with countdown and acceleration in stdout is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
Task Description

The task is to simulate the countdown of a rocket launch from 5 down to 0 seconds and then display the moving, accelerating rocket on the standard output device as a simple ASCII art animation.



Go[edit]

Translation of: Rust


...though my rocket is a bit fancier :)

package main
 
import (
"fmt"
"time"
)
 
const rocket = `
/\
( )
( )
/|/\|\
/_||||_\
`

 
func printRocket(above int) {
fmt.Print(rocket)
for i := 1; i <= above; i++ {
fmt.Println(" ||")
}
}
 
func cls() {
fmt.Print("\x1B[2J")
}
 
func main() {
// counting
for n := 5; n >= 1; n-- {
cls()
fmt.Printf("%d =>\n", n)
printRocket(0)
time.Sleep(time.Second)
}
 
// ignition
cls()
fmt.Println("Liftoff !")
printRocket(1)
time.Sleep(time.Second)
 
// liftoff
ms := time.Duration(1000)
for n := 2; n < 100; n++ {
cls()
printRocket(n)
time.Sleep(ms * time.Millisecond)
if ms >= 40 {
ms -= 40
} else {
ms = 0
}
}
}

Julia[edit]

rocket() = println("        /..\\\n        |==|\n        |  |\n        |  |\n",
" | |\n /____\\\n | |\n |SATU|\n | |\n",
" | |\n /| | |\\\n / | | | \\\n /__|_|__|__\\\n /_\\/_\\\n")
 
exhaust() = println(" *****")
cls() = print("\x1B[2J")
curup(n) = print("\e[$(n)A")
curdown(n) = print("\e[$(n)B")
 
function countdown(secs)
print("Countdown...T minus ")
for i in secs:-1:1
print(i, "... ")
sleep(1)
end
print("LIFTOFF!")
end
 
engineburn(rows) = (println("\n"); for i in 1:rows exhaust(); sleep(0.9^i); end)
 
testrocket() = (cls(); rocket(); curup(16); countdown(5); curdown(13); engineburn(30))
 
testrocket()
 
Output:
Countdown...T minus 5... 4... 3...
        /..\
        |==|
        |  |
        |  |
        |  |
       /____\
       |    |
       |SATU|
       |    |
       |    |
      /| |  |\
     / | |  | \
    /__|_|__|__\
       /_\/_\

Perl 6[edit]

Works with: Rakudo version 2019.07.1

Uses ANSI graphics. Works best in a 24 bit ANSI terminal at least 80x24, though bigger is better.

This is a very simple simulation. It assumes a constant ~2G+ acceleration in a gravitational field; so net +10 meters per second². It completely neglects the effects of air friction, impulse, snap, crackle & pop and has an unrealistically clean fuel burn (no contrail). It does however (unlike most of the entries at this time) start at the base of the terminal (on the ground) and go up, rather than starting at the top and dropping a contrail. It calculates and displays an accurate displacement and velocity over time and uses those to scale its vertical screen displacement.

The motion is a little "notchy" as the vertical resolution in a terminal is rather low. Exits after the rocket leaves the visible area of the terminal. See the example animated gif

signal(SIGINT).tap: { cleanup() }
 
my ($rows,$cols) = qx/stty size/.words;
my $v = floor $rows - 9;
my $h = floor $cols / 2 - 4;
my $a = 0;
my $start = now;
my $t = -5;
my $i = 0;
my $j = 0;
 
my @r = Q' |', Q' /_\', Q' | |', Q' /| |\', Q'/_|_|_\';
my @x = Q'
(/|\)', Q' {/|\}', Q' \|/', Q' |';
my @y = Q'
/|\', Q' // \\', Q' (/ \)', Q' \ /'; #'
 
my $sp = ' ' x $h;
 
my $altitude = 0;
my $velocity = 0;
 
my @pal = "\e[38;2;255;0;0m", "\e[38;2;255;255;0m", "\e[38;2;255;155;0m";
constant \W = "\e[38;2;255;255;255m";
 
print "\e[?25l\e[48;5;232m";
 
loop {
if $t >= 0 {
$velocity = 5 * $t²;
$altitude = $velocity * $t / 2;
$a = ($altitude / $v).round;
}
cleanup() if $a > $rows + 5;
 
print "\e[H\e[J", "\n" xx $v, W, $sp, @r.join("\n$sp"), "\n", $sp;
if $t < 0 {
print Q'\/ \/'
} else {
exhaust( @pal[$i], $a )
}
print W, "\n", '▔' x $cols, @pal[1];
printf "\n Time: T %-4s %9s Altitude: %6.2f meters Velocity: %5.1f m/sec\n",
$t < 0 ?? "- {$t.round.abs}" !! "+ {$t.round}",
$t < 0 ?? '' !! $a == 0 ?? 'Ignition!' !! 'Lift-off!',
$altitude.round(.01), $velocity.round(.1);
 
++$i;
$i %= 3;
++$j;
$j %= 2;
$t = (now - $start - 5);
sleep .05;
}
 
sub exhaust ($clr, $a) {
print Q'\/', $clr, Q'/^\', W, Q'\/'; #'
return if $a == 0;
if $a < 4 {
print "\n", $clr,
$sp, ( $j ?? @x[^$a].join("\n$sp") !! @y[^$a].join("\n$sp"))
} else {
print "\n", $clr,
$sp, ( $j ?? @x.join("\n$sp") !! @y.join("\n$sp"));
print "\n" x $a - 4;
}
}
 
# clean up on exit, reset ANSI codes, scroll, re-show the cursor & clear screen
sub cleanup () { print "\e[0m", "\n" xx 50, "\e[H\e[J\e[?25h"; exit(0) }
Sample output:

See rocket-perl6.gif (offsite animated gif image)

Phix[edit]

sequence rocket = split("""
/\
/ \
| |
| |
/|/\|\
/_||||_\
""","\n")
 
integer lines = 0, l = 0, t = 5
atom s = 1
 
while length(rocket) do
if t>0 then
rocket[$] = sprintf("T minus %d...",t)
-- allow console resize during countdown:
lines = video_config()[VC_SCRNLINES]
if l!=lines-7 then l = 0 end if
else
if l=1 then
rocket = rocket[2..$]
else
l -= (length(rocket)>6)
if length(rocket)<12 then
rocket = append(rocket," ** ")
elsif length(rocket)=12 then
rocket = append(rocket," ")
end if
end if
s = s*0.95
end if
if l=0 then
clear_screen()
cursor(NO_CURSOR)
l = lines-7
end if
position(l,1)
puts(1,join(rocket,"\n"))
sleep(s)
t -= 1
if t=0 then rocket = rocket[1..$-1] end if
end while
cursor(BLOCK_CURSOR)

Racket[edit]

Translation of: Go
#lang racket
 
(define rocket #<<EOF
/\
( )
( )
/|/\|\
/_||||_\
EOF
)
 
(define (cls) (displayln "\x1B[2J"))
 
(define (print-rocket n)
(displayln rocket)
(for ([i (in-range n)]) (displayln "")))
 
(for ([i (in-range 5 0 -1)])
(cls)
(printf "~a =>\n" i)
(print-rocket 0)
(sleep 1))
 
(cls)
(printf "Liftoff!\n")
(print-rocket 1)
(sleep 1)
 
(for/fold ([ms 1000] #:result (void)) ([n (in-range 2 100)])
(cls)
(print-rocket n)
(sleep (/ ms 1000))
(if (>= ms 40) (- ms 40) 0))

REXX[edit]

This REXX program hard-codes the name of the (OS) command to clear the terminal screen   (CLS).

/*REXX pgm does a countdown and then display the launching of a rocket (ASCII animation)*/
parse arg cntDown . /*obtain optional argument from the CL.*/
if cntDown=='' | cntDown=="," then cntDown= 5 /*Not specified? Then use the default.*/
@. = /* [↓] glyphs for the rocket ship. */
@.1= ' /\ '
@.2= ' | | '
@.3= ' | | '
@.4= ' | | '
@.5= ' /|/\|\ '
@.6= '/_||||_\'
do rs=1 while @.rs\=='' /*determine size of the rocket (height)*/
end /*rs*/
rs= rs - 1 /*the true rocket size (height). */
cls= 'CLS' /*the command used to clear the screen.*/
parse value scrsize() with sd sw .
sw= sw - 1 /*usable screen width on some systems. */
sd= sd - 3 /* " " depth " " " */
air= sd - 1 - rs /*"amount" of sky above the rocket. */
say
do j=cntDown by -1 to 1 /* [↓] perform countdown; show rocket.*/
cls /*use this command to clear the screen.*/
say right(j, 9) 'seconds' /*display the amount of seconds to go. */
call sky /*display the sky above the rocket. */
call rocket /*display the rocket (on the ground). */
call delay 1 /*wait one second during the countdown.*/
end /*j*/
 
say left('',9) "liftoff!" /*announce liftoff of the rocket. */
cls /*use this command to clear the screen.*/
call sky /*display the sky above the rocket. */
period= 1
dt= period / sd /*acceleration (period is decreasing).*/
call rocket /*display the rocket (in flight). */
do sd+4; say /*"make" the rocket appear to fly. */
period= format(period-period*dt,,3) /*calculate the decrease in the period.*/
call delay max(period, .001) /*wait for a diminishing time interval.*/
end /*sd+4*/
exit /*stick a fork in it, da rocket is gone*/
/*──────────────────────────────────────────────────────────────────────────────────────*/
sky: do air; say; end /*air*/; return /*display the sky above the rocket. */
rocket: do ship=1 for rs; say left('', sw%2 - 5) @.ship; end /*ship*/; return

This REXX program makes use of   SCRSIZE   REXX program (or BIF) which is used to determine the screen
width and depth of the terminal (console).   Some REXXes don't have this BIF.

The   SCRSIZE.REX   REXX program is included here   ───►   SCRSIZE.REX.

Rust[edit]

 
use std::{thread, time};
 
fn print_rocket(above: u32) {
print!(
" oo
oooo
oooo
oooo
");
for _num in 1..above+1 {
println!(" ||");
}
}
 
fn main() {
 
// counting
for number in (1..6).rev() {
print!("\x1B[2J");
println!("{} =>", number);
print_rocket(0);
let dur = time::Duration::from_millis(1000);
thread::sleep(dur);
}
 
// ignition
print!("\x1B[2J");
println!("Liftoff !");
print_rocket(1);
let dur = time::Duration::from_millis(1000);
thread::sleep(dur);
 
// liftoff
let mut dur_time : u64 = 1000;
for number in 2..100 {
print!("\x1B[2J");
print_rocket(number);
let dur = time::Duration::from_millis(dur_time);
thread::sleep(dur);
dur_time -= if dur_time >= 30 {30} else {dur_time};
}
}
 
 

zkl[edit]

Translation of: Go

Uses ANSI terminal codes.

var [const] rocket=
#<<<
0'~
/\
( )
( )
/|/\|\
/_||||_\
~, flame=" **";
#<<<
 
fcn cls { print("\x1B[2J") }
fcn cursorUp(n) { print("\e[%dA".fmt(n)) }
fcn cursorDown(n){ print("\e[%dB".fmt(n)) }
fcn cursor2Col(n){ print("\e[%dG".fmt(n)) }
 
fcn __main__{
tall,tall := rocket.counts(), tall[tall.find("\n")+1];
cls(); print(rocket); cursorUp(tall);
 
// count down to ignition
print("T minus: ");
foreach n in ([5..1, -1]){ print(n," "); Atomic.sleep(1); }
print(" Liftoff !"); cursorDown(tall); cursor2Col(1);
 
// liftoff
ms:=1.0; // 1 sec
do(25){
println(flame); Atomic.sleep(ms);
ms=(ms - 0.04).max(0); // 40 milliseconds faster than last time
}
}
Output:
T minus: 5 4 3 2 1     Liftoff !
    /\
   (  )
   (  )
  /|/\|\
 /_||||_\
    **
    **
    **
    **