Lucid TurtleToy 🐢

Image by Karl Ibri at unsplash.com/photos/cqqz2bweoau

Modified version of Text Contour code by @reinder at 2D SDF and Contour Lines

```const paletteSize = 10;

// You can find the Turtle API reference here: https://turtletoy.net/syntax
Canvas.setpenopacity(-1/paletteSize);
let baleSize = paletteSize;
const bales = Array.apply(null,{length: paletteSize}).map(b => new Bale(baleSize--));
bales[9].up();

let limit = 0;
let ratio = 0;
const precision = .8;

const text = new Text();
const segments = text.print(new Turtle(-59,-40), "Lucid TurtleToy", 0.5);

function sdSegment( p, a, b ) {
function scale(a,b) { return [a[0]*b,a[1]*b]; }
function sub(a,b) { return [a[0]-b[0],a[1]-b[1]]; }
function dot(a,b) { return a[0]*b[0]+a[1]*b[1]; }
function length(a) { return Math.sqrt(dot(a,a)); }

const pa = sub(p, a), ba = sub(b, a);
const h = Math.max(0, Math.min(1, dot(pa,ba)/dot(ba,ba)));
return length(sub(pa, scale(ba,h)));
}

function map(p) {
function scale(a,b) { return [a[0]*b,a[1]*b]; }
function add(a,b) { return [a[0]+b[0],a[1]+b[1]]; }

p = add(scale(p, 0.713), [1e-8, 1e-8]);
let d = 10000;
for (let i=0; i<segments.length; i++) {
d = Math.min(d, sdSegment(p, segments[i][0], segments[i][1]));
}
return d;
}

const cache = new Float64Array((300/precision*2)**2);
cache.fill(1000);

function cachedMap(p) {
const id = ((((p[0]+150)/precision*2)|0) + ((((p[1]+150)/precision*2)|0) * 300/precision*2));
if (cache[id] < 500) {
return cache[id];
} else {
return cache[id] = map(p);
}
}

// The walk function will be called until it returns false.
function walk(i) {
if(i == 0) {
limit = image.length * image[0].length;
ratio = 200 / image[0].length;
}

if(i < 20) {
const pairs = ContourLines(1+i/5, precision, cachedMap);
const lines = mergePairs(pairs);

lines.forEach(line => {
let baleIndex = i/2|0;
bales[baleIndex].jump(line[0]);
for (let j=1; j<line.length; j++)
bales[baleIndex].goto(line[j]);
if(i<7) {
bales[6+baleIndex].jump(line[0]);
for (let j=1; j<line.length; j++)
bales[6+baleIndex].goto(line[j]);
}
});
return true;
}

const x = (i - 20) % image[0].length;
const y = (i - 20)/ image[0].length | 0;

bales[image[y][x]].jump(x*ratio - 100, y*ratio - .125);
bales[image[y][x]].circle(.25);
bales[image[y][x]].jump(x*ratio - 100, y*ratio - .06125);
bales[image[y][x]].circle(.125);
return i - 19 < limit;
}

function mergePairs(pairs) {
function dist_sqr(a,b) { return (a[0]-b[0])**2+(a[1]-b[1])**2; }
const np = [];
while (pairs.length) {
const l = pairs.pop(), eps = 1e-16;
np.push(l);
for (let p0 = l[l.length-1], i=0; i<pairs.length; i++) {
const p1 = pairs[i];
if (dist_sqr(p0, p1[0]) <= eps) {
l.push(pairs.splice(i, 1)[0][1]);
}
if (dist_sqr(p0, p1[1]) <= eps) {
l.push(pairs.splice(i, 1)[0][0]);
}
}
}
return np;
}

////////////////////////////////////////////////////////////////
// Contour Lines utility code. Created by Reinder Nijhoff 2020
// https://turtletoy.net/turtle/104c4775c5
////////////////////////////////////////////////////////////////
function ContourLines(z, step, zFunc) {
function lerp(a,b,t) { return [a[0]*(1-t)+b[0]*t,a[1]*(1-t)+b[1]*t]; }
const intersectSegmentZ = (z, v1, v2) => {
if (v1[2] === v2[2]) return false;
const t = (z - v1[2]) / (v2[2] - v1[2]);
if (t < 0 || t > 1) return false;
return lerp(v1, v2, t);
}
const intersectTriangleZ = (z, p1, p2, p3) => {
const p = [];
const v1 = intersectSegmentZ(z, p1, p2);
const v2 = intersectSegmentZ(z, p2, p3);
const v3 = intersectSegmentZ(z, p3, p1);
if (v1 && v2) p.push([v1, v2]);
if (v1 && v3) p.push([v1, v3]);
if (v2 && v3) p.push([v2, v3]);

return p;
}
const result = [];
for (let x = -100; x <= 100; x += step) {
for (let y = -100; y <= 100; y += step) {
const corners = [[x, y], [x+step, y], [x+step, y+step], [x, y+step]];
corners.forEach( c => c[2] = zFunc(c) );
const c3 = [x+step/2, y+step/2, zFunc([x+step/2, y+step/2])];
for (let i=0; i<4; i++) {
result.push(...intersectTriangleZ(z, corners[i], corners[(i+1) & 3], c3));
}
}
}
return result;
}

////////////////////////////////////////////////////////////////
// Text utility code. Created by Reinder Nijhoff 2019
// https://turtletoy.net/turtle/1713ddbe99
////////////////////////////////////////////////////////////////

function Text() {
class Text {
print (t, str, scale = 1, italic = 0, kerning = 1) {
const r = [];
t.up();
let pos = [t.x(), t.y()], h = t.h(), o = pos;
str.split('').map(c => {
const i = c.charCodeAt(0) - 32;
if (i < 0 ) {
pos = o = this.rotAdd([0, 48*scale], o, h);
} else if (i > 96 ) {
pos = this.rotAdd([16*scale, 0], o, h);
} else {
const d = dat[i], lt = d[0]*scale, rt = d[1]*scale, paths = d[2];
paths.map( p => {
p.map( (s, i) => {
const p0 = [t.x(), t.y()];
t.goto(this.rotAdd([(s[0]-s[1]*italic)*scale - lt, s[1]*scale], pos, h));
if (i>0) r.push([p0, [t.x(), t.y()]]);
});
});
pos = this.rotAdd([(rt - lt)*kerning, 0], pos, h);
}
});
t.down();
return r;
}
return [Math.cos(h)*a[0] - Math.sin(h)*a[1] + b[0],
Math.cos(h)*a[1] + Math.sin(h)*a[0] + b[1]];
}
}

const dat = ('br>eoj^jl<jqirjskrjq>brf^fe<n^ne>`ukZdz<qZjz<dgrg<cmqm>`thZhw<lZlw<qao_l^h^e_caccdeefg'+
'gmiojpkqmqporlshsercp>^vs^as<f^h`hbgdeeceacaab_d^f^h_k`n`q_s^<olmmlolqnspsrrspsnqlol>]wtgtfsereqfph'+
'nmlpjrhsdsbraq`o`makbjifjekckaj_h^f_eaecffhimporqssstrtq>eoj`i_j^k_kajcid>cqnZl\\j_hcghglhqjulxnz>c'+
'qfZh\\j_lcmhmllqjuhxfz>brjdjp<egom<ogem>]wjajs<ajsj>fnkojpiojnkokqis>]wajsj>fnjniojpkojn>_usZaz>`ti'+
'^f_dbcgcjdofrisksnrpoqjqgpbn_k^i^>`tfbhak^ks>`tdcdbe`f_h^l^n_o`pbpdofmicsqs>`te^p^jfmfogphqkqmppnrk'+
'shserdqco>`tm^clrl<m^ms>`to^e^dgefhekenfphqkqmppnrkshserdqco>`tpao_l^j^g_ebdgdlepgrjsksnrppqmqlping'+
'hcecddaf_i^j^m_oapepjoomrjshserdp>fnjgihjikhjg<jniojpkojn>fnjgihjikhjg<kojpiojnkokqis>^vrabjrs>]wag'+
'sg<amsm>^vbarjbs>asdcdbe`f_h^l^n_o`pbpdofngjijl<jqirjskrjq>]xofndlcicgdfeehekfmhnknmmnk<icgefhfkgmh'+
'q^qs<chqh>fnj^js>brn^nnmqlrjshsfreqdndl>_tc^cs<q^cl<hgqs>`qd^ds<dsps>^vb^bs<b^js<r^js<r^rs>_uc^cs<c'+
'^qs<q^qs>_uh^f_daccbfbkcndpfrhslsnrppqnrkrfqcpan_l^h^>_tc^cs<c^l^o_p`qbqepgohlici>_uh^f_daccbfbkcnd'+
'pfrhslsnrppqnrkrfqcpan_l^h^<koqu>_tc^cs<c^l^o_p`qbqdpfoglhch<jhqs>`tqao_l^h^e_caccdeefggmiojpkqmqpo'+
'rlshsercp>brj^js<c^q^>_uc^cmdpfrisksnrppqmq^>asb^js<r^js>^v`^es<j^es<j^os<t^os>`tc^qs<q^cs>asb^jhjs'+
'<r^jh>`tq^cs<c^q^<csqs>cqgZgz<hZhz<gZnZ<gznz>cqc^qv>cqlZlz<mZmz<fZmZ<fzmz>brj\\bj<j\\rj>asazsz>fnkc'+
'ieigjhkgjfig>atpeps<phnfleiegfehdkdmepgrislsnrpp>`sd^ds<dhffhekemfohpkpmopmrkshsfrdp>asphnfleiegfeh'+
'dkdmepgrislsnrpp>atp^ps<phnfleiegfehdkdmepgrislsnrpp>asdkpkpiognfleiegfehdkdmepgrislsnrpp>eqo^m^k_j'+
'bjs<gene>atpepuoxnylzizgy<phnfleiegfehdkdmepgrislsnrpp>ate^es<eihfjemeofpips>fni^j_k^j]i^<jejs>eoj^'+
'k_l^k]j^<kekvjyhzfz>are^es<oeeo<ikps>fnj^js>[y_e_s<_ibfdegeifjijs<jimfoeretfuius>ateees<eihfjemeofp'+
'ips>atiegfehdkdmepgrislsnrppqmqkphnfleie>`sdedz<dhffhekemfohpkpmopmrkshsfrdp>atpepz<phnfleiegfehdkd'+
'mepgrislsnrpp>cpgegs<gkhhjfleoe>bsphofleieffehfjhkmlompopporlsisfrep>eqj^jokrmsos<gene>ateeeofrhsks'+
'mrpo<peps>brdejs<pejs>_ubefs<jefs<jens<rens>bseeps<pees>brdejs<pejshwfydzcz>bspees<eepe<esps>cqlZj['+
'i\\h^h`ibjckekgii<j[i]i_jakbldlfkhgjkllnlpkrjsiuiwjy<ikkmkojqirhthvixjylz>fnjZjz>cqhZj[k\\l^l`kbjci'+
'eigki<j[k]k_jaibhdhfihmjilhnhpirjskukwjy<kkimiojqkrltlvkxjyhz>^vamakbhdgfghhlknlplrksi<akbidhfhhill'+
'nmpmrlsisg>brb^bscsc^d^dsese^f^fsgsg^h^hsisi^j^jsksk^l^lsmsm^n^nsoso^p^psqsq^r^rs').split('>').map(
r=> { return [r.charCodeAt(0)-106,r.charCodeAt(1)-106, r.substr(2).split('<').map(a => {const ret
= []; for (let i=0; i<a.length; i+=2) {ret.push(a.substr(i, 2).split('').map(b => b.charCodeAt(0)
-106));} return ret; })]; });

return new Text();
}

////////////////////////////////////////////////////////////////
// Bale utility code - Created by Jurgen Westerhof 2022
// https://turtletoy.net/turtle/7269af8a23
// Abusing the opacity, usage:
//      Canvas.setpenopacity(1/baleSize);
//      const bales = Array.apply(null,{length: baleSize}).map(b => new Bale(baleSize--);
// Then use bales[x] wherever you would use a turtle object to 'draw'
// in 'color' x (i.e Polygon hatching with a bale object and .15 interspacing)
////////////////////////////////////////////////////////////////
function Bale(n) {
class Bale {
constructor(n) { this.turtles = Array.apply(null,{length: n}).map(i => new Turtle()); }

back(e)         { this.turtles.map(t => t.back(e)); return this; }
backward(e)     { this.turtles.map(t => t.backward(e)); return this; }
bk(e)           { this.turtles.map(t => t.bk(e)); return this; }
fd(e)           { this.turtles.map(t => t.fd(e)); return this; }
forward(e)      { this.turtles.map(t => t.forward(e)); return this; }

left(e)         { this.turtles.map(t => t.left(e)); return this; }
lt(e)           { this.turtles.map(t => t.lt(e)); return this; }
right(e)        { this.turtles.map(t => t.right(e)); return this; }
rt(e)           { this.turtles.map(t => t.rt(e)); return this; }

seth(e)         { this.turtles.map(t => t.seth(e)); return this; }

setx(e)         { this.turtles.map(t => t.setx(e)); return this; }
sety(e)         { this.turtles.map(t => t.sety(e)); return this; }

setpos(x, y)        { this.turtles.map(t => t.setpos(x, y)); return this; }
setposition(x, y)   { this.turtles.map(t => t.setposition(x, y)); return this; }

degrees(e)      { this.turtles.map(t => t.degrees(e)); return this; }

goto(x, y)      { this.turtles.map(t => t.goto(x, y)); return this; }
jmp(x, y)       { this.turtles.map(t => t.jmp(x, y)); return this; }
jump(x, y)      { this.turtles.map(t => t.jump(x, y)); return this; }

circle(radius, extent, steps) { this.turtles.map(t => t.circle(radius, extent, steps)); return this; }

clone()         { let b = new Bale(this.turtle.length); this.turtles.map((t, k) => b.turtles[k] = t.clone()); return b; }

h()             { return this.turtles[0].h(); }

home()          { this.turtles.map(t => t.home()); return this; }

isdown()        { return this.turtles[0].isdown(); }

pos()           { return this.turtles[0].pos(); }
position()      { return this.turtles[0].position(); }

pd()            { this.turtles.map(t => t.pd()); return this; }
pendown()       { this.turtles.map(t => t.pendown()); return this; }
penup()         { this.turtles.map(t => t.penup()); return this; }
pu()            { this.turtles.map(t => t.pu()); return this; }
down()          { this.turtles.map(t => t.down()); return this; }
up()            { this.turtles.map(t => t.up()); return this; }

x()             { return this.turtles[0].x(); }
xcor()          { return this.turtles[0].xcor(); }
y()             { return this.turtles[0].y(); }
ycor()          { return this.turtles[0].ycor(); }
}
return new Bale(n);
}

const image = [[9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9],
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];```