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code guessing, round #43 (completed)

started at ; stage 2 at ; ended at

specification

I've had it with these prompts, man... your challenge is to, uh, squints at paper emulate a spirograph. submissions may be written in any language.

a spirograph is a sort of toy that lets you draw geometric shapes known as hypotrochoids and epitrochoids by rolling a disc around a ring.

today we will emulate this behaviour. given a radius r, a larger radius R, and a distance value d, the goal is to trace out the line drawn by a point of distance d from a circle of radius abs(r) rolling around a circle of radius R.

if r is negative, the result is an epitrochoid and the r circle rolls around the outside of the R circle, such as in this example with R = 3, r = -1, and d = 0.5:

an animation of an epitrochoid being drawn

otherwise, it is a hypotrochoid and it rolls on the inside, such as in this example with R = 5, r = 3, and d = 5:

an animation of a hypotrochoid being drawn

your challenge is to create a program that renders and displays one of these shapes, given the three parameters. you are only required to output the final shape; in the examples above, the only thing to be returned would be the path of the red line at the end of the animation. as any language is allowed, and the output is visual, there is no fixed API.

results

  1. 👑 soup girl +6 -0 = 6
    1. moshikoi
    2. Flamore
    3. dadsdy (was Zaya)
    4. luatic (was taswelll)
    5. seshoumara
    6. LyricLy
    7. Olivia (was dadsdy)
    8. Palaiologos (was Olivia)
    9. razetime (was Palaiologos)
    10. olus2000
    11. taswelll (was JJRubes)
    12. JJRubes (was luatic)
    13. ultlang
    14. Zaya (was razetime)
  2. Olivia +5 -1 = 4
    1. soup girl (was moshikoi)
    2. Flamore
    3. JJRubes (was Zaya)
    4. seshoumara (was taswelll)
    5. Zaya (was seshoumara)
    6. Palaiologos (was LyricLy)
    7. dadsdy
    8. LyricLy (was soup girl)
    9. luatic (was Palaiologos)
    10. olus2000
    11. moshikoi (was JJRubes)
    12. taswelll (was luatic)
    13. ultlang
    14. razetime
  3. taswelll +4 -0 = 4
    1. seshoumara (was moshikoi)
    2. Zaya (was Flamore)
    3. moshikoi (was Zaya)
    4. Flamore (was seshoumara)
    5. luatic (was LyricLy)
    6. soup girl (was dadsdy)
    7. razetime (was soup girl)
    8. Olivia
    9. Palaiologos
    10. olus2000
    11. JJRubes
    12. ultlang (was luatic)
    13. dadsdy (was ultlang)
    14. LyricLy (was razetime)
  4. razetime +4 -1 = 3
    1. taswelll (was moshikoi)
    2. soup girl (was Flamore)
    3. Zaya
    4. LyricLy (was taswelll)
    5. seshoumara
    6. JJRubes (was LyricLy)
    7. moshikoi (was dadsdy)
    8. Olivia (was soup girl)
    9. Palaiologos (was Olivia)
    10. luatic (was Palaiologos)
    11. olus2000
    12. Flamore (was JJRubes)
    13. dadsdy (was luatic)
    14. ultlang
  5. LyricLy +4 -1 = 3
    1. taswelll (was moshikoi)
    2. dadsdy (was Flamore)
    3. luatic (was Zaya)
    4. Olivia (was taswelll)
    5. seshoumara
    6. Zaya (was dadsdy)
    7. Flamore (was soup girl)
    8. Palaiologos (was Olivia)
    9. razetime (was Palaiologos)
    10. olus2000
    11. JJRubes
    12. soup girl (was luatic)
    13. ultlang
    14. moshikoi (was razetime)
  6. luatic +4 -1 = 3
    1. Olivia (was moshikoi)
    2. ultlang (was Flamore)
    3. JJRubes (was Zaya)
    4. LyricLy (was taswelll)
    5. seshoumara
    6. moshikoi (was LyricLy)
    7. dadsdy
    8. Flamore (was soup girl)
    9. soup girl (was Olivia)
    10. Palaiologos
    11. olus2000
    12. razetime (was JJRubes)
    13. taswelll (was ultlang)
    14. Zaya (was razetime)
  7. Zaya +3 -1 = 2
    1. luatic (was moshikoi)
    2. Flamore
    3. moshikoi (was taswelll)
    4. JJRubes (was seshoumara)
    5. dadsdy (was LyricLy)
    6. LyricLy (was dadsdy)
    7. Olivia (was soup girl)
    8. razetime (was Olivia)
    9. Palaiologos
    10. olus2000
    11. seshoumara (was JJRubes)
    12. soup girl (was luatic)
    13. taswelll (was ultlang)
    14. ultlang (was razetime)
  8. Flamore +4 -3 = 1
    1. soup girl (was moshikoi)
    2. Olivia (was Zaya)
    3. LyricLy (was taswelll)
    4. moshikoi (was seshoumara)
    5. seshoumara (was LyricLy)
    6. dadsdy
    7. JJRubes (was soup girl)
    8. Palaiologos (was Olivia)
    9. taswelll (was Palaiologos)
    10. olus2000
    11. razetime (was JJRubes)
    12. luatic
    13. ultlang
    14. Zaya (was razetime)
  9. moshikoi +2 -1 = 1
    1. Zaya (was Flamore)
    2. JJRubes (was Zaya)
    3. olus2000 (was taswelll)
    4. seshoumara
    5. Palaiologos (was LyricLy)
    6. dadsdy
    7. ultlang (was soup girl)
    8. soup girl (was Olivia)
    9. razetime (was Palaiologos)
    10. LyricLy (was olus2000)
    11. Olivia (was JJRubes)
    12. Flamore (was luatic)
    13. taswelll (was ultlang)
    14. luatic (was razetime)
  10. JJRubes +1 -3 = -2
    1. Flamore (was moshikoi)
    2. luatic (was Flamore)
    3. moshikoi (was Zaya)
    4. ultlang (was taswelll)
    5. seshoumara
    6. soup girl (was LyricLy)
    7. LyricLy (was dadsdy)
    8. Zaya (was soup girl)
    9. dadsdy (was Olivia)
    10. olus2000 (was Palaiologos)
    11. Palaiologos (was olus2000)
    12. Olivia (was luatic)
    13. razetime (was ultlang)
    14. taswelll (was razetime)
  11. ultlang +2 -5 = -3
    1. taswelll (was moshikoi)
    2. JJRubes (was Flamore)
    3. luatic (was Zaya)
    4. razetime (was taswelll)
    5. seshoumara
    6. Palaiologos (was LyricLy)
    7. LyricLy (was dadsdy)
    8. moshikoi (was soup girl)
    9. Zaya (was Olivia)
    10. Flamore (was Palaiologos)
    11. olus2000
    12. soup girl (was JJRubes)
    13. Olivia (was luatic)
    14. dadsdy (was razetime)
  12. dadsdy +1 -4 = -3
    1. luatic (was moshikoi)
    2. Zaya (was Flamore)
    3. ultlang (was Zaya)
    4. olus2000 (was taswelll)
    5. seshoumara
    6. Olivia (was LyricLy)
    7. Palaiologos (was soup girl)
    8. Flamore (was Olivia)
    9. moshikoi (was Palaiologos)
    10. razetime (was olus2000)
    11. soup girl (was JJRubes)
    12. JJRubes (was luatic)
    13. taswelll (was ultlang)
    14. LyricLy (was razetime)
  13. Palaiologos +0 -3 = -3
    1. olus2000 +2 -9 = -7
      1. taswelll (was moshikoi)
      2. soup girl (was Flamore)
      3. luatic (was Zaya)
      4. Palaiologos (was taswelll)
      5. seshoumara
      6. Flamore (was LyricLy)
      7. Olivia (was dadsdy)
      8. LyricLy (was soup girl)
      9. Zaya (was Olivia)
      10. razetime (was Palaiologos)
      11. JJRubes
      12. moshikoi (was luatic)
      13. dadsdy (was ultlang)
      14. ultlang (was razetime)
    2. seshoumara +0 -9 = -9
      1. dadsdy (was moshikoi)
      2. soup girl (was Flamore)
      3. luatic (was Zaya)
      4. ultlang (was taswelll)
      5. Palaiologos (was LyricLy)
      6. JJRubes (was dadsdy)
      7. razetime (was soup girl)
      8. Flamore (was Olivia)
      9. moshikoi (was Palaiologos)
      10. Zaya (was olus2000)
      11. Olivia (was JJRubes)
      12. taswelll (was luatic)
      13. olus2000 (was ultlang)
      14. LyricLy (was razetime)

    entries

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    entry #1

    written by moshikoi
    submitted at
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    comments 2
    razetime

    (R r d)←⍺. You can thank me later


    moshikoi *known at the time as [author of #1] replying to razetime

    ok i will thank you later


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    spiro.apls Unicode text, UTF-8 text
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    e  ¯1
    
    cycloid  {
      R  1
      r  2
      d  3
      x  ((R - r) × (2  )) + d × 2   × (R - r) ÷ r
      y  ((R - r) × (1  )) - d × 1   × (R - r) ÷ r
      x y
    }
    
    plot  {
      bin  (  )   ( ÷ 2) + 
      (   1 + bin)  ' o'
    }
    
    draw  {
      size  1
      resolution  2
      R  1
      r  2
      d  3
      cycle  | 2 × resolution × (R  r) ÷ R
      size plot ↓⍉↑ ((size ÷ 2) ÷ R + d + |r) ×  cycloid ( cycle) ÷ resolution
    }
    
      (50 50) draw (8 ¯2 0.3) 
    

    entry #2

    written by Flamore
    submitted at
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    comments 5
    LyricLy

    you have a skill issue


    Flamore *known at the time as [author of #2]

    no i wrote it in 10 minutes


    luatic replying to Flamore

    you have a time issue then


    olive

    tiny error with args, just needs the Z adding

    @@ -36 +36 @@
    -        function EpiX(R,r,d,t){
    +        function EpiX(R,r,d,t,Z){
    @@ -39 +39 @@
    -        function EpiY(R,r,d,t){
    +        function EpiY(R,r,d,t,Z){
    @@ -42 +42 @@
    -        function HypX(R,r,d,t){
    +        function HypX(R,r,d,t,Z){
    @@ -45 +45 @@
    -        function HypY(R,r,d,t){
    +        function HypY(R,r,d,t,Z){
    @@ -57,2 +57,2 @@
    -                let x = EpiX(R,r,d,t);
    -                let y = EpiY(R,r,d,t);
    +                let x = EpiX(R,r,d,t,Z);
    +                let y = EpiY(R,r,d,t,Z);
    @@ -76,2 +76,2 @@
    -                let x = HypY(R,r,d,t)
    -                let y = HypY(R,r,d,t)
    +                let x = HypY(R,r,d,t,Z);
    +                let y = HypY(R,r,d,t,Z);
    

    olive

    found the bug

    @@ -76,2 +76,2 @@
    -                let x = HypY(R,r,d,t)
    +                let x = HypX(R,r,d,t,Z);
    

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    spiro.html ASCII text

    entry #3

    written by Zaya
    submitted at
    1 like

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    comments 0

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    main.lua ASCII text
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    -- sample usage: love . 5 3 5
    
    local R = arg[2] and tonumber(arg[2]) or 3
    local r = arg[3] and tonumber(arg[3]) or -1
    local d = arg[4] and tonumber(arg[4]) or 0.5
    local max_radius = R + math.abs(r) + d
    local Rpx = R * 25
    local rpx = r * 25
    local dpx = d * 25
    
    local x, y = max_radius * 25, max_radius * 25
    local data = love.image.newImageData(1024, 1024)
    for angle = 0, 360, 0.1 do
        local x1 = Rpx * math.cos(angle * math.pi / 180)
        local y1 = Rpx * math.sin(angle * math.pi / 180)
        data:setPixel(x + x1, y + y1, 0, 0, 1, 1)
    end
    
    local img = love.graphics.newImage(data)
    local angle = 0
    function love.draw()
        angle = angle - 1
    
        local radius = (Rpx - rpx)
        local x1 = radius * math.cos(angle * math.pi / 180)
        local y1 = radius * math.sin(angle * math.pi / 180)
        local xo, yo = x + x1, y + y1
        data:setPixel(xo, yo, 1, 1, 1, 1)
    
        local ratio = (1 - (R/r))
        local x1 = dpx * math.cos(angle * ratio * math.pi / 180)
        local y1 = dpx * math.sin(angle * ratio * math.pi / 180)
        data:setPixel(xo + x1, yo + y1, 1, 0, 0, 1)
    
        img:replacePixels(data)
        love.graphics.draw(img, 0, 0, 0, 1, 1)
    end
    

    entry #4

    written by taswelll
    submitted at
    2 likes

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    cg43.sh ASCII text
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    #!/bin/sh
    # USAGE: ./cg43.sh 6 5 1N (d R r)
    sed -i 's/return math.floor(x)/return Fraction(math.floor(x))/' x7/core.py
    echo P1 > img
    echo 640 480 >> img
    cp cg43.x7 cg43.x7.tmp
    echo "$* ;2" >> cg43.x7.tmp
    python -m x7 cg43.x7.tmp >> img
    pnmtopng img > img.png
    rm img cg43.x7.tmp
    
    cg43.x7 ASCII text
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    d.;p2D0.{Z+d;p+;p2*DJ2*;p*f- 6iM2*1+` d{_M1fT^*} Mi1fE1+*`` ZfD` 0fEf-`fp}M^*24*J24D`fp
    355 113D:p d_&&`;p2**ed0>`N`24*Ji{M24D_d0+`f_f`d_+`lpf;1fp`D*;1` Z+}v_ppp480i640i0$$`E 320 240.Z24*+J`eE3iM^+1-`fp`f_s`s1$`p``EE
    

    entry #5

    written by seshoumara
    submitted at
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    cg43_spirograph.dc SVG XML document
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    #!/usr/bin/dc -f
    
    [Problem]c
    	# spirograph: hypotrochoids and epitrochoids (echo 'R r d' as input*)
    	# https://cg.esolangs.gay/43/
    [Restrictions]c
    	# *negative numbers are given using _ prefix, not - which is a dc command
    	# the SVG shape can't be saved to a file, only printed :(
    
    
    [main]c
    [
    	#save each input parameter to its own register
    	?sdsrsR
    	#based on r's sign execute the approppriate shape drawing function
    	0lr>hlex
    ]sm
    
    
    #TODO: fix it!!
    [hypotrochoids]c
    [
    	#gen angle range using LCM(r,R)/R as scaling factor
    	lrlRlLxlR/dsf
    	360*lSx10k
    	#calculate plot coordinates, stored in x and y arrays
    	[
    		ddddd
    		#calculate x
    		lRlr-rlAxlCx*r
    		lRlr-lr/*lAxlCxld*
    		+r:x
    		#calculate y
    		lRlr-rlAxlCx d*1r-lVxv *r
    		lRlr-lr/*lAxlCx d*1r-lVxv ld*
    		-r:y
    		#loop back if there's still an angle to process
    		z0r>_
    	]ds_x
    	#print then quit
    	0klpxqq
    ]sh
    
    
    #TODO: fix it!!
    [epitrochoids]c
    [
    	#make r positive
    	lrlVxsr
    	#gen angle range using no (1) scaling factor
    	1dsf
    	360*lSx10k
    	#calculate plot coordinates, stored in x and y arrays
    	[
    		ddddd
    		#calculate x
    		lRlr+rlAxlCx*r
    		lRlr+lr/*lAxlCxld*
    		-r:x
    		#calculate y
    		lRlr+rlAxlCx d*1r-lVxv *r
    		lRlr+lr/*lAxlCx d*1r-lVxv ld*
    		-r:y
    		#loop back if there's still an angle to process
    		z0r>_
    	]ds_x
    	#print then quit
    	0klpxqq
    ]se
    
    
    [print]c
    [
    	#gen angle range
    	lf360*lSx
    	#print SVG header
    	[<?xml version="1.0" encoding="UTF-8" standalone="no"?>]nAP
    	[<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" ]n
    	["http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">]nAP
    	[<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg" ]n
    	[xmlns:xlink="http://www.w3.org/1999/xlink">]nAP
    	[  <path d="]n
    	#add start point
    	d[M ]n;xn[ ]nr;yn
    	[
    		#add line segment
    		d[ L ]n;xn[ ]nr;yn
    		#loop back if there's still an angle to process
    		z0r>_
    	]ds_x
    	#print SVG footer
    	[ Z"/>]nAP[</svg>]nAP
    ]sp
    
    
    #TODO: fix it!!
    ######################### MATH #########################
    
    #3: [stop] -> [0 1 2 3 ... stop]
    [seq]c
    [
    	0r
    	[
    		#push increment and float stop to top
    		rd1+3R
    		#push [increment stop]
    		d3Rd_4Rr
    		#loop back if stop != increment
    		!=_
    	]ds_x
    	#pop stop
    	d-+
    ]sS
    
    
    #2: [a b] -> [GCD]
    [GCD]c
    [
    	#change to [max min]
    	d3Rd_4Rr
    	[r]s_>_
    	#Euclidean algorithm
    	[
    		#change to [min max%min]
    		d_3R%
    		#loop back on non-zero remainder
    		d0r>_
    	]ds_x
    	#pop remainder (0), GCD=min
    	+
    ]sG
    
    
    #2: [a b] -> [LCM]
    [LCM]c
    [
    	#push [a b]
    	d3Rd_4Rr
    	#change to [|ab| GCD]
    	*lVx
    	_3RlGx
    	#divide to get LCM
    	/
    ]sL
    
    
    #1: [a] -> [cos]
    [COS]c
    [
    	10k
    	#Taylor serie
    	dddddddd*******40320/r
    	dddddd*****720/0r-r
    	dddd***24/r
    	d*2/0r-
    	1++++0k
    ]sC
    
    
    #1: [degrees] -> [radians]
    [d2g]c
    [
    	10k
    	#push 1 rad
    	180 3.1415926535 /
    	#convert
    	/0k
    ]sA
    
    
    #1: [a] -> [abs]
    [abs]c
    [
    	10kd*v0k
    ]sV
    
    ########################################################
    
    lmx
    

    entry #6

    written by LyricLy
    submitted at
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    core.wfs ASCII text
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    #!/usr/bin/env -S wolframscript -function -signature Integer Integer Real String -f
    (* wrong orientation for the r < 0 case but I don't think it matters *)
    ({R, r, d, file} |-> Export[file, ParametricPlot[{(R - r) Cos[t] + d Cos[t ((R - r) / r)], (R - r) Sin[t] - d Sin[t ((R - r) / r)]}, {t, 0, 2 Pi (LCM[R, r] / R)}]])
    

    entry #7

    written by dadsdy
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    submission.txt ASCII text
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    Desmos Latex (paste in)
    c\left(t\right)=\left(\cos t,\sin t\right)
    f\left(r,R,d,t\right)=\left(R-r\right)c\left(t\left|r\right|\right)+d\operatorname{sgn}\left(r\right)c\left(t\operatorname{sgn}\left(r\right)\left(r-R\right)\right)
    f\left(3,5,5,t\right)
    f\left(-1,3,0.5,t\right)
    

    entry #8

    written by soup girl
    submitted at
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    LyricLy

    Written out with signs. Formatted

    /* I mean it's not
    like anybody was
    going to compile
    it anyway lmao */
    #include <math.h>
    #include <stdio.h>
    #include <stdlib.h>
    void draw(int Rn,
    int Rd,int rn,int rd,
    int dn,int dd,char*
    fn){int an=Rn*rd,
    ad=Rd*rn,ae=ad;
    double bn=an-ad;
    while(ae)ae^=an
    ^=ae^=an%=ae;
    ad/=an;double bd
    =rd*Rd,w=bn/bd,
    v=w*rd/rn,d=dn/
    dd,m=512.0/(Rn*dd
    *rd+Rd*dn*rd-Rd*
    dd*rn)*Rd*dd*rd;
    unsigned char*img
    =calloc(1,1049600
    );for(double t=0;t
    <6.284*ad;t+=
    0.0001){int x=(w*
    cos(t)+d*cos(v*t))
    *m-1; int y=(w*sin(
    t)-d*sin(v*t))*m-1;
    img[x-1024*y+
    523776]=1;}FILE*
    fp=fopen(fn,"w");
    fputs("P3 1024 1"
    "024 255 ",fp);for
    (int i=0;i<1048576;
    i++)fputs(img[i]?
    "0 0 0 ":"255 255"
    " 255 ",fp);fclose(
    fp);free(img);}int
    main(){draw(5,1,3,1
    ,5,1,"test1.ppm");
    draw(5,1,31,10,5,1,
    "test2.ppm");}
    // code guessing
    int main(){draw(5,1
    ,3,1,5,1,"test1.ppm"
    );draw(5,1,31,10,
    5,1,"test2.ppm");}
    

    post a comment


    spirograph.tar.mp4.bz3.zip Zip archive data, at least v2.0 to extract, compression method=store
    dir Code Guessing
    dir region
    r.-1.-1.mca data
    r.-1.0.mca data
    r.0.-1.mca data
    r.0.0.mca Intel ia64 COFF executable, no relocation info, no line number info, stripped, 334 sections, symbol offset=0x1bf0200, 16973824 symbols, created Sun Sep 6 19:12:00 1970, 1st section name ""
    level.dat gzip compressed data, from Unix
    1
    cg: couldn't decode file contents
    

    entry #9

    written by Olivia
    submitted at
    2 likes

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    spiro.m Unicode text, UTF-8 text
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    function spironolactone(R,r,d)
    [~,D]=rat(R/abs(r));%D←R÷⍨R∧|r
    t=2i*pi*(0:1e-3:D);%t←({○0j2×⍳D×⍵}÷⊢)1000
    plot((R-r)*exp(t)+d*exp(t-R/r*t))%]Plot (9∘○{⍺⍵}11∘○) ((R-r)×*t)+d×*t×1-R÷r
    end
    

    entry #10

    written by Palaiologos
    submitted at
    0 likes

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    spiro.apl Unicode text, UTF-8 text
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     spiro{
         R r dv600 600255
         x{((R+r)×2)+d×2(×R+r)÷r}
         y{((R+r)×1)-d×1(×R+r)÷r}
          {( 1)⎕NPUT(255,'P2',⍴),' ',⍕,} v{
            v[300+⌊20×x;300+⌊20×y]0
         }¨(62831×(R∧|r)÷R)×1e¯4
     }
    

    entry #11

    written by olus2000
    submitted at
    4 likes

    guesses
    comments 1
    olus2000

    It's a lexaloffle post now, with an embeddable cart and stuff!


    post a comment


    TIO.txt ASCII text, with very long lines (1081)
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    Try It Online:
    https://pico-8-edu.com/?c=AHB4YQYaAwDrwX4wefP9V58dnf0SySNkz-AEYXN79QZN9gwPEN5-w1F33XVRf0ybDhxW3XRXEdzVJkkb31UVQV0U1Um7a8HOzsAzDM0kD1C9wGEjg91Uv9AHa1Nj4drCQhQ-QNQU1dxMO74ydt-clg2OawobLCYrZogTR4wlo2NR_BLXpVbwyytUQ0sDD9FqBgQ7AyNS4sryZnGgG12wxtZEPxPF1dRasjUcLzTPsxY4xtATzTs5QmtgdmeqFRTHnr1fyR5zI2USjsTnjfo_z_LLG31tq_ep6pHttZmpCcWhfiHYUhcYWGjGHI-GESuOX5DnwZ6jNM2TiproCr_Rrvg5oSt_OH66Qo7SFT8W0pmkEVQJZ0ZHX6Pb6tdHF2eybCMWU38mmu49dFnilYlkvG03bkgH6jsVAxQTipXtdWMckY-V04POv1Ykg2cq9yXpxogv0lQw0PcpJAZmlhY3mpl2e37MA5ojaxvZkA_akZG4mgyLYmIiSRaSGcuuVE0SmUGjZF8NLvZGF28kckG6BvmOYbXDdA7LQ6f0hoUFzNAtzO-pz6wHbVUNjly5f0YYDi2kS004oCIyX1xh-lzQLsyktTPGAu_K0OwFt95hggP6sEsmFjTppbKyObCtb1PtHNEtHRBuh_N3bK2aTsC_vr5gf2NoZKGuZ4aadFEewhTrAweEO4U8pJZgo4CnpS1hONRMF9PFhqaJX-enHZE7XnuOP6qsqhzvyPFHlA2rjlc8e6Nv6mZhb6_feJE3OaIbjSebrXBlQWe_gZyPqpmwXKMSE6jEGk5pvnO6cUrh2jCkUrgXpoJtBYKsX0pFEIKlBUVd_UVviKZXQz7mEJ31gYBRHUs2rATW0mKzV3FDVzZN18wK9rpK_uApth7DGkb0l0Q71WaHcCdg3SNhMDUUJUMbReiqAzbKqHF9AtesbFRV0rgegSlWoyuGVtpbdARGjNgWSZ8uKtnDOvvVgH69REKS5ATLr3JEpHLPQ6SvVu_YT22-Q1bStjukW7E_tC8A&g=w-w-w-w1HQHw-w2Xw-w3Xw-w2HQH
    
    cg43.p8.png PNG image data, 160 x 205, 8-bit/color RGBA, non-interlaced

    entry #12

    written by JJRubes
    submitted at
    3 likes

    guesses
    comments 0

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    index.html ASCII text
    p5.min.js Unicode text, UTF-8 text, with very long lines (65497)
    sketch.js ASCII text
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    let Rslider;
    let rslider;
    let dslider;
    function setup() {
      createCanvas(400, 400);
      background(0);
      Rslider = createSlider(0, 30, 5);
      Rslider.position(20, 20);
      rslider = createSlider(-15, 15, 3);
      rslider.position(220, 20);
      dslider = createSlider(0, 30, 5);
      dslider.position(20, 360);
    }
    
    const gcd = (a, b) => b == 0 ? a : gcd (b, a % b)
    const lcm = (a, b) =>  a / gcd (a, b) * b
    function hypoX(R, r, d, theta) {
      if (R == r) { return d * cos(theta); }
      return (R - r) * cos(theta) + d * cos((R - r) / r * theta);
    }
    function hypoY(R, r, d, theta) {
      if (R == r) { return d * sin(theta); }
      return (R - r) * sin(theta) - d * sin((R - r) / r * theta);
    }
    
    function scale_and_draw(R, r, d, rot) {
      let extent = TWO_PI * lcm(r, R) / R;
      let k = (width / 2 - 10) / (R - r + d);
      if (r > R) {
        k = (width / 2 - 10) / (r - R + d);
      }
      R *= k; r *= k; d *= k;
      
      noFill();
      beginShape();
      for(let i = 0; i < 1000; i++) {
        let x = hypoX(R, r, d, extent / 1000 * i);
        let y = hypoY(R, r, d, extent / 1000 * i);
        let acc_factor = mag(x, y);
        let wobble_dir = TWO_PI - TWO_PI * noise(5 * rot, x / 200, y / 200);
        let x_temp = x * cos(rot) - y * sin(rot) + 5 * cos(wobble_dir);
        y = x * sin(rot) + y * cos(rot) + 5 * sin(wobble_dir);
        x = x_temp;
        
        vertex(x + width / 2, y + height / 2);
      }
      endShape(CLOSE);
    }
    
    let rotation = 0;
    let smooth_vel = 0.001;
    function draw() {
      let R = Rslider.value();
      let r = rslider.value();
      if (r == 0) { r = 1/2; }
      let d = dslider.value();
      background(0, 100);
      strokeWeight(2);
      stroke(255);
      let vel = mag(movedX / width, movedY / height);
      vel *= vel * 3;
      vel += 0.001;
      smooth_vel = 0.9 * smooth_vel + 0.1 * vel;
      scale_and_draw(R, r, d, rotation, smooth_vel);
      rotation += smooth_vel;
    }
    
    style.css ASCII text
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    html, body {
      margin: 0;
      padding: 0;
    }
    canvas {
      display: block;
    }
    

    entry #13

    written by luatic
    submitted at
    0 likes

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    dir spirou
    main.lua Unicode text, UTF-8 text
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    -- (c) 2021 🥺🥺🥺
    -- this code was manualy cursed to meet the lowest standards ✅✅✅
    -- "Inter-token spacing is the root of all evil." - Mahatma Gandhi
    local splurped={}
    do
    	local ts={_G}
    	local s={}
    	repeat
    		local ns={}
    		local fr={}
    		for _,t in pairs(ts) do
    			s[t]=1
    			for k,v in pairs(t) do
    				if fr[k]==nil then
    					fr[k]=v
    				else
    					fr[k]=fr
    				end
    				if type(v)=="table" and not s[v] then
    					ns[#ns+1]=v
    				end
    			end
    		end
    		for k,v in pairs(fr) do
    			if splurped[k]==nil and v~=fr then
    				splurped[k]=v
    			end
    		end
    		ts=ns
    	until#ts==0
    end
    setfenv(1,setmetatable({},{__index=splurped}))
    local function mapva(f,...)
    	if select("#",...)==0 then return end
    	return f((...)),mapva(f,select(2,...))
    end
    p,x,pts,stp=400,0,{},{} -- 400² is the HOLY RESOLUTION - DO NOT TOUCH!
    function love.load(args)
    	R,r,d=mapva(tonumber,unpack(args))
    	m=p/(R-r+abs(d))*0.5*0.75
    	R,r,d=R*m,r*m,d*m
    	mdt = min(abs(1/(R-r)),abs(r/(R-r)/d))/10
    	setTitle(((r<0)and"epi"or"hypo").."trochoid")
    	setMode(p,p)
    end
    function love.update(fdt)
    	n=ceil(fdt/mdt)
    	dt=fdt/n
    	for i=1,n do
    		x=x-dt
    		y=-x*(R-r)/r
    		cx,cy=p/2,p/2
    		rx,ry=cx+(R-r)*cos(x),cy+(R-r)*sin(x)
    		px,py=floor(rx-d*cos(y)),floor(ry-d*sin(y))
    		h=py*p+px
    		if not stp[h] then
    			stp[h]=1
    			insert(pts,{px,py})
    		end
    	end
    end
    function love.draw()
    	setColor(0,1,0,1)
    	ellipse("line",cx,cy,R,R)
    	ellipse("line",rx,ry,abs(r),abs(r))
    	line(rx,ry,px,py)
    	setColor(1,0,0,1)
    	points(pts)
    end
    
    uhh.txt ASCII text
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    so uh i maded some sussy hax but they shoud work on
    LOVE 11.3 (Mysterious Mysteries)
    oh uh also run is "love . R r d" in foldr
    

    entry #14

    written by ultlang
    submitted at
    1 like

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    comments 0

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    taswelll.py Unicode text, UTF-8 text
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    # Code by LyricLy
    from PIL import Image
    from math import sin,cos,radians as rad,\
     copysign as s
    i = Image.new(mode='L',size=(512,512))
    s = 0
     #code by code by code
    def tf(s,point):
     return (int(s*point[0]+256),int(\
      s*point[1]+256))
    def spiro(R,r,d):
     assert R>r
     s = 250/max(R,R-r,R-r+d)
     for a in range(3600):
      α=a*r/10 # Code by RocketRace
      p=(cos(rad(α))*R,sin(rad(α))*R)
      i.putpixel(tf(s, p),120)
      c=(p[0]-cos(rad(α))*r,p[1]-\
       sin(rad(α))*r)
      i.putpixel(tf(s,c),80)
      δ=rad(α)+-1*rad(α)*R/r
      path=(cos(δ)*d+c[0],sin(δ)*d+c[1])
      i.putpixel(tf(s,path),255)
     i.save("spiro.png")
    spiro(5,3,5)
    # coded by palaiologos
    

    entry #15

    written by razetime
    submitted at
    1 like

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    comments 0

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    g.py ASCII text, with CRLF line terminators
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    from manim import *
    
    class e(Scene):
    	def construct(self):
    		r=float(input("r = "))
    		R=float(input("R = "))
    		d=float(input("d = "))
    		d/=r
    		p=ValueTracker(0)
    		C=Circle(radius=R)
    		c=always_redraw(lambda:VGroup(Circle(radius=abs(r),color=GREEN),Dot().shift(abs(d*r)*RIGHT),Dot(),Line().set_length(d*r).shift(0.5*d*r*RIGHT)).rotate(p.get_value(),about_point=ORIGIN).move_to(C.get_center()).shift((R+r)*RIGHT).rotate(abs(r/R)*p.get_value(),about_point=C.get_center()))
    		t=TracedPath(c[1].get_center)
    		self.play(Create(C))
    		self.play(Create(c))
    		self.add(t)
    		self.play(p.animate.set_value(20*PI), run_time=10, rate_func=rate_functions.linear)
    		self.wait() 
    
    with tempconfig({"quality": "medium_quality", "preview": True}):
    	scene=e()
    	scene.render()