// Gilbert tessellation. Created by Reinder Nijhoff 2023 - @reindernijhoff
//
// https://turtletoy.net/turtle/4823100ba2
//

const poissonRadius = 10; // min=5, max=50, step=1
const angle = 0; // min=0, max=3, step=1 (Free, ∟, ∠, Hex)
const border = 10; //min=0, max=50, step=1

const lines = [];
const disc = PoissonDisc([[0,0]], poissonRadius);
const points = disc.addPoints((300/poissonRadius) **2, 50, 0, 1);

class lineSegment {
    constructor(center, delta, index) {
        this.index = index;
        this.center =[...center];
        this.delta = [...delta];
        this.end = add(center, scale(delta, 0.1));
        this.turtle = new Turtle(center);
        this.done = false;
    }
    
    grow(dt, lines, ignoreIntersections = false) {
        if (this.done) return;
        let end = add(this.end, scale(this.delta, dt));
        let done = Math.abs(end[0]) > 100-border || Math.abs(end[1]) > 100-border;
        
        lines.forEach( (line, index) => {
            if (index === this.index || ignoreIntersections) return;

            const intersection = segment_intersect(this.end, end, line.start.end, line.end.end);
            if (intersection) {
                done = true;
                end = intersection;
            }
        });
        
        this.done = done || ignoreIntersections;
        this.turtle.goto(end);
        this.end = end;
    }
}

class line {
    constructor(start, delta, index, instant = false) {
        this.start = new lineSegment(start, scale(delta,  1), index);
        this.end   = new lineSegment(start, scale(delta, -1), index);
        this.instant = instant;
    }
    
    grow(dt, lines) {
        this.start.grow(this.instant?.9:dt, lines, this.instant);
        this.end.grow(this.instant?.9:dt, lines, this.instant);
    }
}

const drawInstant = (v, i, a) => { [scale(sub(a[(i+1)%a.length], v), .5)].forEach(direction => lines.push(new line(add(v, direction), direction, i, true))); };
fontOutput()/* .map(l => l.map(p => scale(p, Math.min(1, (100-border)/90)))) */.forEach(l => l.forEach(drawInstant));
[[border-100, border-100], [border-100, 100-border], [100-border, 100-border], [100-border, border-100]].forEach(drawInstant);

points.filter(p => Math.abs(p[0]) < 100-border && Math.abs(p[1]) < 100-border).forEach( point => {
    const r = angle == 0 ? Math.random() : angle == 1 ?  (Math.random() * 4 | 0) / 4 : angle == 2? (Math.random() * 8 | 0) / 8: (Math.random() * 6 | 0) / 6;
    const a = r * Math.PI * 2;
    lines.push(new line(point, [Math.sin(a), Math.cos(a)], lines.length));
});

function walk(i) {
    lines.forEach(line => line.grow(1, lines));
    return lines.find(a => !a.start.done || !a.end.done);
}

////////////////////////////////////////////////////////////////
// Poisson-Disc utility code. Created by Reinder Nijhoff 2019
// https://turtletoy.net/turtle/b5510898dc
////////////////////////////////////////////////////////////////
function PoissonDisc(startPoints, radius) {
    class PoissonDiscGrid {
        constructor(sp, radius) {
            this.cellSize = 1/Math.sqrt(2)/radius;
            this.radius2 = radius*radius;
            this.cells = [];
            sp.forEach( p => this.insert(p) );
        }
        insert(p) {
            const x = p[0]*this.cellSize|0, y=p[1]*this.cellSize|0;
            for (let xi = x-1; xi<=x+1; xi++) {
                for (let yi = y-1; yi<=y+1; yi++) {
                    const ps = this.cell(xi,yi);
                    for (let i=0; i<ps.length; i++) {
                        if ((ps[i][0]-p[0])**2 + (ps[i][1]-p[1])**2 < this.radius2) {
                            return false;
                        }
                    }
                }       
            }
            this.cell(x, y).push(p);
            return true;
        }
        cell(x,y) {
            const c = this.cells;
            return (c[x]?c[x]:c[x]=[])[y]?c[x][y]:c[x][y]=[];
        }
    }
    class PoissonDisc {
        constructor(sp, radius) {
            this.result = [...sp];
            this.active = [...sp];
            this.grid = new PoissonDiscGrid(sp, radius);
        }
        addPoints(count, maxTries=16, loosePacking=0, randomGrowOrder=0) {
        	mainLoop: while (this.active.length > 0 && count > 0) {
        		const index = (Math.random() * this.active.length * randomGrowOrder) | 0;
        		const point = this.active[index];
        		for (let i=0; i < maxTries; i++) {
        			const a = Math.random() * 2 * Math.PI;
        			const d = (Math.random()*loosePacking + 1) * radius;
        			const p = [point[0] + Math.cos(a)*d, point[1] + Math.sin(a)*d, point];
        			if (this.grid.insert(p)) {
            			this.result.push(p);
            			this.active.push(p);
            			count--;
            			continue mainLoop;
        			}
        		}
    		    this.active.splice(index, 1);
        	}
        	return this.result;
        }
    }
    return new PoissonDisc(startPoints, radius);
}

////////////////////////////////////////////////////////////////
// 2D math functions
////////////////////////////////////////////////////////////////

function scale(a,b) { return [a[0]*b,a[1]*b]; }
function add(a,b) { return [a[0]+b[0],a[1]+b[1]]; }
function sub(a,b) { return [a[0]-b[0],a[1]-b[1]]; }
function segment_intersect(l1p1, l1p2, l2p1, l2p2) {
	const d   = (l2p2[1] - l2p1[1]) * (l1p2[0] - l1p1[0]) - (l2p2[0] - l2p1[0]) * (l1p2[1] - l1p1[1]);
	if (d === 0) return false;
	const n_a = (l2p2[0] - l2p1[0]) * (l1p1[1] - l2p1[1]) - (l2p2[1] - l2p1[1]) * (l1p1[0] - l2p1[0]);
	const n_b = (l1p2[0] - l1p1[0]) * (l1p1[1] - l2p1[1]) - (l1p2[1] - l1p1[1]) * (l1p1[0] - l2p1[0]);
	const ua = n_a / d;
	const ub = n_b / d;
	if (ua >= 0 && ua <= 1 && ub >= 0 && ub <= 1) {
		return [l1p1[0] + ua * (l1p2[0] - l1p1[0]), l1p1[1] + ua * (l1p2[1] - l1p1[1])];
	}
	return false;
}

function fontOutput() { return [[[-77,-35.6],[-77,-40],[-62.62292754540243,-40],[-62.62292754540243,-35.6],[-67.61146377270121,-35.6],[-67.61146377270121,-20],[-72.01146377270122,-20],[-72.01146377270122,-35.6]],[[-50.645855090804865,-40],[-46.24585509080487,-40],[-46.24585509080487,-26.666666666666664],[-46.268014948940944,-26.143606028481035],[-46.33435790045488,-25.623770233065127],[-46.444474918989314,-25.110364240960628],[-46.597687096507364,-24.606553370833684],[-46.793049828986405,-24.115443784232735],[-47.029358640215996,-23.640063335069687],[-47.305156607794274,-23.183342901893674],[-47.61874334553897,-22.74809831805018],[-47.96818548693372,-22.337013011132107],[-48.35132860497552,-21.95262145875635],[-48.76581049493363,-21.597293562666458],[-49.209075738127254,-21.27322003750035],[-49.678391456931436,-20.982398904306052],[-50.17086416387644,-20.72662317207755],[-50.68345760096016,-20.507469783258088],[-51.21301145918836,-20.326289891365644],[-51.75626086293053,-20.184200530682155],[-52.309856498963846,-20.08207772936575],[-52.870385266102936,-20.02055110844581],[-53.43439131810365,-20],[-53.998397370104364,-20.02055110844581],[-54.55892613724346,-20.08207772936575],[-55.11252177327677,-20.184200530682155],[-55.65577117701894,-20.326289891365644],[-56.18532503524714,-20.507469783258088],[-56.69791847233086,-20.72662317207755],[-57.19039117927586,-20.982398904306052],[-57.659706898080046,-21.27322003750035],[-58.10297214127367,-21.597293562666458],[-58.51745403123178,-21.95262145875635],[-58.90059714927359,-22.337013011132107],[-59.25003929066833,-22.74809831805018],[-59.56362602841303,-23.183342901893674],[-59.839423995991304,-23.640063335069687],[-60.0757328072209,-24.115443784232735],[-60.271095539699935,-24.606553370833684],[-60.424307717217985,-25.110364240960628],[-60.53442473575242,-25.623770233065127],[-60.600767687266355,-26.14360602848103],[-60.62292754540243,-26.666666666666664],[-60.62292754540243,-40],[-56.222927545402435,-40],[-56.222927545402435,-26.666666666666664],[-56.21433141884059,-26.48882604968355],[-56.18859603713381,-26.312081879242143],[-56.145880067468205,-26.137523841926615],[-56.08644686800126,-25.966228146083452],[-56.01066286417124,-25.79925088663913],[-55.91899528956248,-25.637621533923692],[-55.812009305255025,-25.48233658664385],[-55.690364515418565,-25.33435342813706],[-55.55481090063345,-25.194584423784917],[-55.40618419401097,-25.063891295977157],[-55.24540072862086,-24.943079811306596],[-55.073451787993164,-24.83289481275012],[-54.89139749452569,-24.734015627464057],[-54.70036027347685,-24.647051878506367],[-54.50151793284075,-24.57253972630775],[-54.29609640176918,-24.510938563064318],[-54.08536217231079,-24.462628180431935],[-53.87061449106644,-24.427906427984354],[-53.65317734890185,-24.406987376871577],[-53.43439131810365,-24.4],[-53.21560528730545,-24.406987376871577],[-52.99816814514086,-24.427906427984354],[-52.78342046389651,-24.462628180431935],[-52.57268623443812,-24.510938563064318],[-52.36726470336656,-24.57253972630775],[-52.168422362730446,-24.647051878506367],[-51.97738514168161,-24.734015627464057],[-51.795330848214135,-24.83289481275012],[-51.62338190758644,-24.943079811306596],[-51.46259844219633,-25.063891295977157],[-51.31397173557385,-25.194584423784917],[-51.178418120788734,-25.33435342813706],[-51.056773330952275,-25.48233658664385],[-50.94978734664482,-25.637621533923692],[-50.85811977203606,-25.79925088663913],[-50.78233576820604,-25.966228146083452],[-50.722902568739094,-26.137523841926615],[-50.680186599073494,-26.312081879242143],[-50.65445121736671,-26.488826049683553],[-50.645855090804865,-26.666666666666664]],[[-44.24585509080487,-40],[-44.24585509080487,-20],[-39.84585509080487,-20],[-39.84585509080487,-27.8],[-38.40678987112092,-27.8],[-34.50678987112092,-20],[-29.8687826362073,-20],[-33.94386817100639,-28.150171069598183],[-33.19944058779606,-28.464860202450957],[-32.78154139144001,-28.698894997440036],[-32.38329259722321,-28.964996334312822],[-32.00714954139318,-29.26152360983981],[-31.65543127096936,-29.58664863476206],[-31.33030624604711,-29.93836690518588],[-31.03377897052012,-30.314509961015915],[-30.767677633647338,-30.712758755232713],[-30.533642838658253,-31.130657951588763],[-30.33311748788845,-31.56563106257295],[-30.167337886806862,-32.01499633431282],[-30.037326121781472,-32.47598328047898],[-29.94388375857696,-32.94574976325459],[-29.887586900435217,-33.42139951606015],[-29.8687826362073,-33.9],[-29.887586900435217,-34.378600483939856],[-29.94388375857696,-34.85425023674541],[-30.037326121781472,-35.32401671952102],[-30.167337886806862,-35.78500366568718],[-30.33311748788845,-36.23436893742705],[-30.533642838658253,-36.66934204841124],[-30.767677633647338,-37.087241244767284],[-31.03377897052012,-37.48549003898408],[-31.33030624604711,-37.86163309481412],[-31.65543127096936,-38.21335136523794],[-32.00714954139318,-38.538476390160184],[-32.38329259722322,-38.83500366568718],[-32.78154139144001,-39.10110500255996],[-33.19944058779606,-39.33513979754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