Created 2025-09-30
/**
* ============================================================================
* = Donut, Donut, and Donut!!! =
* ============================================================================
*
* > This first donut code is ported from https://www.a1k0n.net/js/donut.js,
* > the original author is Alex Naka, please refer to the original post for
* > more math details: https://www.a1k0n.net/2011/07/20/donut-math.html
*
* In this example, we draw a donut by a "donut" code, and the code for
* formatting the "donut" code is also a "donut" code. So, there are three
* donuts in this example!!!
*/
// Click to change the rotation speed of the donut.
const S = recho.number(10, {min: 5, max: 30, step: 1});
const T = recho.interval(30);
//➜
//➜
//➜
//➜ $$$@@@@@@
//➜ #####**###$$$$@@@@$
//➜ ##**!!!==!!!**##$$$@@@$$
//➜ ##*!=!===;;:;=!!*##$$$$$$$$#
//➜ *#**!!=;::~~~~::==**##$$$$$$$#*
//➜ ###*!=;:~-,...,-~;=!*###$$$$$$##*
//➜ !####*!=:~,.......~;=!*###$$$$$$##*
//➜ =#$$$##*=:-..... .~;!!*####$$$$###*!
//➜ *$$$$$#*!;~.. ~=!**###########**=
//➜ !#$$@@$$#*=~. :=!**###########**!=
//➜ !#$@@@@$$#*; ;!!***##########***!!;
//➜ !#$$@@@@$$#*!!!!****##########****!!=:
//➜ =*#$$$$$$$#################*****!!!=:
//➜ ;!*##$$$$##############*******!!!=;;
//➜ :;!**############*********!*!!!==;:
//➜ :=!!!***************!*!*!!!!==;:~
//➜ :;!===!***!!!!!!!!!!!!!!===;:~-
//➜ ~:;=====!!!!!!!!!====;;;::~,
//➜ -~::;;;===;=;;;;;;:::~-.
//➜
{
var b=[];var z=[];
var A=1+(T*0.07*S)/10;var
B=1+(T*0.03*S)/10;var sin=/***/
Math.sin;var cos=Math.cos;var cA=
cos(A),sA=sin(A),cB=cos(B),sB=sin(B);
for(var k=0;k<1760;k++){b[k]=k%80==79?
"\n":" ";z[k]=0;}for (var j=0;j<6.28;j+=
0.07){var ct=/**/ cos(j),st=sin(j);
for(var i=0;i< 6.28;i+=0.02){
var sp=sin(i), cp=cos(i),h=ct
+2,D=1/(sp*h* sA+st*cA+5),t
=sp*h*cA-st*sA; var x=0|(40+30
*D*(cp*h*cB-t* sB)),y=0|(12+15
*D*(cp*h*sB+t*/**/ cB)),o=x+80*y,N=
0|(8*((st*sA-sp*ct* cA)*cB-sp*ct*sA-st*cA
-cp*ct*sB));if(y<22&&y>=0&&x>=0&&x<79&&
D>z[o]){z[o]=D;b[o]=".,-~:;=!*#$@"[N>
0?N:0];}}}echo(b.join(""));/*****
*******************************
*************************
******************/
}
/**
* We use a format function to format the code for drawing the
* donut. The readable code is as follows:
*/
//➜
//➜
//➜ var b=[];var z=[];
//➜ var A=1+(T*0.07*S)/10;var
//➜ B=1+(T*0.03*S)/10;var sin=/***/
//➜ Math.sin;var cos=Math.cos;var cA=
//➜ cos(A),sA=sin(A),cB=cos(B),sB=sin(B);
//➜ for(var k=0;k<1760;k++){b[k]=k%80==79?
//➜ "\n":" ";z[k]=0;}for (var j=0;j<6.28;j+=
//➜ 0.07){var ct=/**/ cos(j),st=sin(j);
//➜ for(var i=0;i< 6.28;i+=0.02){
//➜ var sp=sin(i), cp=cos(i),h=ct
//➜ +2,D=1/(sp*h* sA+st*cA+5),t
//➜ =sp*h*cA-st*sA; var x=0|(40+30
//➜ *D*(cp*h*cB-t* sB)),y=0|(12+15
//➜ *D*(cp*h*sB+t*/**/ cB)),o=x+80*y,N=
//➜ 0|(8*((st*sA-sp*ct* cA)*cB-sp*ct*sA-st*cA
//➜ -cp*ct*sB));if(y<22&&y>=0&&x>=0&&x<79&&
//➜ D>z[o]){z[o]=D;b[o]=".,-~:;=!*#$@"[N>
//➜ 0?N:0];}}}echo(b.join(""));/*****
//➜ *******************************
//➜ *************************
//➜ ******************/
//➜
//➜
echo(format(`
var b = [];
var z = [];
var A = 1 + (T * 0.07 * S) / 10;
var B = 1 + (T * 0.03 * S) / 10;
var sin = Math.sin;
var cos = Math.cos;
var cA = cos(A),
sA = sin(A),
cB = cos(B),
sB = sin(B);
for (var k = 0; k < 1760; k++) {
b[k] = k % 80 == 79 ? "\\n" : " ";
z[k] = 0;
}
for (var j = 0; j < 6.28; j += 0.07) {
var ct = cos(j),
st = sin(j);
for (var i = 0; i < 6.28; i += 0.02) {
var sp = sin(i),
cp = cos(i),
h = ct + 2,
D = 1 / (sp * h * sA + st * cA + 5),
t = sp * h * cA - st * sA;
var x = 0 | (40 + 30 * D * (cp * h * cB - t * sB)),
y = 0 | (12 + 15 * D * (cp * h * sB + t * cB)),
o = x + 80 * y,
N = 0 | (8 * ((st * sA - sp * ct * cA) * cB - sp * ct * sA - st * cA - cp * ct * sB));
if (y < 22 && y >= 0 && x >= 0 && x < 79 && D > z[o]) {
z[o] = D;
b[o] = ".,-~:;=!*#$@"[N > 0 ? N : 0];
}
}
}
echo(b.join(""));
`));
/**
* !!! The format function is also a "donut" code !!!
*/
function /********/
format(code,{w=80,h=24,K=/**/
["var"],R1=11,R2=4}={}){let n=w
*h,mi=-1,M=new Array(n).fill(null),
T=code.replace('" "',"__")/**********/
.replace(/\s+/g," ").split(" ").filter((d)=>
d!=="").map((d)=>d.replace("__",'" "')),tn=
T.length;for(let i=0;i <n;i++){let x=i%w,y=/**/
Math.floor(i/w),d= Math.hypot((x-w/2)
/2,y-h/2),m=d<R1&& d>R2;if(m)mi=i;/**/
M[i]=m?1:x===w-1 ?"\n":" ";}let ni=
-1;for(let i=0, wi=0;i<n;i++){if
(M[i]!==1)/****/ continue;if(wi<
tn){let s=T[wi];if (K.some((k)=>/**/
s.includes(k)))s=s +" ";let si=0;while
(M[i+si]===1)si++;if(si<s.length-1)s=si-1<=0?
" ":"/*"+"*".repeat(Math.max(0,si-4))+"*/";
else wi++;for(let k=0;k<s.length;k++)M[(ni
=i+k)]=s[k];}else if(i-ni<=2)M[i]="/*"[i
-ni-1];else if(mi-i<=1)M[i]="/*"[mi-i];
else M[i]="*";}return M.join("")
;}/**************************
******************/
/**
* We use format function to format itself. Note that we have to manually
* adjust a little bit to make sure the formatted code actually runs,
* including changing "" to " ", and unwrapping `M.join("")`, etc.
*/
//➜
//➜ function /********/
//➜ format(code,{w=80,h=24,K=/**/
//➜ ["var"],R1=11,R2=4}={}){let n=w
//➜ *h,mi=-1,M=new Array(n).fill(null),
//➜ T=code.replace('" "',"" "")/**********/
//➜ .replace(/s+/g,"").split("").filter((d)=>
//➜ d!=="").map((d)=>d.replace("" "",'""')),tn=
//➜ T.length;for(let i=0;i <n;i++){let x=i%w,y=/**/
//➜ Math.floor(i/w),d= Math.hypot((x-w/2)
//➜ /2,y-h/2),m=d<R1&& d>R2;if(m)mi=i;/**/
//➜ M[i]=m?1:x===w-1 ?"":"";}let ni=
//➜ -1;for(let i=0, wi=0;i<n;i++){if
//➜ (M[i]!==1)/****/ continue;if(wi<
//➜ tn){let s=T[wi];if (K.some((k)=>/**/
//➜ s.includes(k)))s=s +"";let si=0;while
//➜ (M[i+si]===1)si++;if(si<s.length-1)s=si-1<=0?
//➜ "":"/*"+"*".repeat(Math.max(0,si-4))+"*/";
//➜ else wi++;for(let k=0;k<s.length;k++)M[(ni
//➜ =i+k)]=s[k];}else if(i-ni<=2)M[i]="/*"[i
//➜ -ni-1];else if(mi-i<=1)M[i]="/*"[mi
//➜ -i];else M[i]="*";}return /***/
//➜ M.join("");}/**************
//➜ ******************/
//➜
echo(format(`
function format(code, {w = 80, h = 24, K = ["var"], R1 = 11, R2 = 4 } = {}) {
let n = w * h,
mi = -1,
M = new Array(n).fill(null),
T = code
.replace('" "', "__")
.replace(/\s+/g, " ")
.split(" ")
.filter((d) => d !== "")
.map((d) => d.replace("__", '" "')),
tn = T.length;
for (let i = 0; i < n; i++) {
let x = i % w,
y = Math.floor(i / w),
d = Math.hypot((x - w / 2) / 2, y - h / 2),
m = d < R1 && d > R2;
if (m) mi = i;
M[i] = m ? 1 : x === w - 1 ? "\n" : " ";
}
let ni = -1;
for (let i = 0, wi = 0; i < n; i++) {
if (M[i] !== 1) continue;
if (wi < tn) {
let s = T[wi];
if (K.some((k) => s.includes(k))) s = s + " ";
let si = 0;
while (M[i + si] === 1) si++;
if (si < s.length - 1) s = si - 1 <= 0 ? " " : "/*" + "*".repeat(Math.max(0, si - 4)) + "*/";
else wi++;
for (let k = 0; k < s.length; k++) M[(ni = i + k)] = s[k];
} else if (i - ni <= 2) M[i] = "/\*"[i - ni - 1];
else if (mi - i <= 1) M[i] = "/\*"[mi - i];
else M[i] = "*";
}
return M.join("");
}
`, {K:["let", "function", "new", "else", "return"], R1:12}));