// A tortoise, a goose & a bicycle. Created by Reinder Nijhoff 2019
// @reindernijhoff
//
// https://turtletoy.net/turtle/d93671dfa0
//

function Translate(x,y) { return p => [p[0]+x, p[1]+y]; }
function Scale(s) { return p => [p[0]*s, p[1]*s]; }
function Circle(r) { return p => { let ry = r - p[1]; a = p[0]/r;
                                   return [ry*Math.cos(a), ry*Math.sin(a)]; } }

function Spiral(f) {
    return p => {
        const x = p[0];
        const y = p[1];
        
        const angle = Math.sqrt((x + 1) * 2 / f);
        const radius = f*angle - y;
        
        return [radius*Math.cos(angle), radius*Math.sin(angle)];
    }
}

const factor = Math.PI;
const numHouses = 400;

const turtle = new Tortoise();
turtle.addTransform(Spiral(factor));
turtle.forward(numHouses*25); 
turtle.forward(numHouses*25);


function walk(i) {
    if (Math.random() > .67) {
        const h = new Tortoise();
        h.addTransform(Scale(.3));
        h.addTransform(Translate(i * 20 + 25, 0));
        h.addTransform(Spiral(factor));
        drawHouse(h);
    } else if (Math.random() > .5) {
        const h = new Tortoise();
        h.addTransform(Scale(.18));
        h.addTransform(Translate(i * 20 + 25, 0));
        h.addTransform(Spiral(factor));
        drawBicycle(h, 0, 0)
    } else {
        const h = new Tortoise();
        h.addTransform(Scale(.15));
        h.addTransform(Translate(i * 20 + 25, -3.5));
        h.addTransform(Spiral(factor));
        goose(h);
    }
    
    return i < numHouses - 1;
}

// House
function drawHouse(t) {
    square(t, [-10,-20], [30,0]);
    square(t, [-5,-15], [2,-8]);
    square(t, [7,0], [14,-15]);
    square(t, [19,-15], [25,-8]);
    square(t, [-25,-15], [-15,-8]);
    for (let i=-20; i<=20; i+=4) {
        t.jmp(i,-30); t.goto(i+10,-20);
    }
    t.jmp(-20,-30); t.goto(20,-30);
    t.jmp(-20,-30); t.goto(-30,-20);
    t.jmp(-30,-20); t.goto(-30,0);
    t.jmp(-30,0); t.goto(-10,0);
}
function square(t, lt, rb) {
    t.jmp(lt); t.goto(lt[0], rb[1]); t.goto(rb), t.goto(rb[0], lt[1]); t.goto(lt);
}

function drawBicycle(t, x, y) {
    t = t.addTransform(Translate(x, y));
    t.jmp(-15,-20); t.circle(10);
    t.jmp( 15,-20); t.circle(10);
    t.jmp(-15, -10); 
        t.goto(0, -10); t.goto(10, -25); 
        t.goto(-5, -25); t.goto(-15, -10);
    t.jmp( 0, -10); t.goto(-6, -28); t.goto(-8, -28); t.goto(-2, -28);  
    t.jmp( 15, -10); t.goto( 9, -28);  t.goto( 14, -28); t.circle(2, 180);
}

// Goose by imakerobots: https://turtletoy.net/turtle/a6b25da0df
//
const a=[-128.964, -86.085,
-129.279, -87.079,
-129.776, -88.158,
-130.277, -89.07,
-130.848, -90.015,
-131.467, -90.985,
-132.115, -91.968,
-132.769, -92.957];
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const list = [a,b,c,d,f,g];

function goose(t) {
    const scale =.2;
    for(let k=0;k<list.length;++k) {
        let j=0;
        t.penup();
        t.goto(
             scale*list[k][j*2+0],
            -scale*list[k][j*2+1]
            );
        t.pendown();
        for(j=1;j<list[k].length/2;++j) {
            t.goto(
                 scale*list[k][j*2+0],
                -scale*list[k][j*2+1]
                );
        }
        t.penup();
    }
}

////////////////////////////////////////////////////////////////
// Tortoise utility code (Minimal Turtle and Transforms)
// https://turtletoy.net/turtle/102cbd7c4d
////////////////////////////////////////////////////////////////

function Tortoise(x, y) {
    class Tortoise extends Turtle {
        constructor(x, y) {
            super(x, y);
            this.ps = Array.isArray(x) ? [...x] : [x || 0, y || 0];
            this.transforms = [];
        }
        addTransform(t) {
            this.transforms.push(t);
            this.jump(this.ps);
            return this;
        }
        applyTransforms(p) {
            if (!this.transforms) return p;
            let pt = [...p];
            this.transforms.map(t => { pt = t(pt); });
            return pt;
        }
        goto(x, y) {
            const p = Array.isArray(x) ? [...x] : [x, y];
            const pt = this.applyTransforms(p);
            if (this.isdown() && (this.pt[0]-pt[0])**2 + (this.pt[1]-pt[1])**2 > 4) {
               this.goto((this.ps[0]+p[0])/2, (this.ps[1]+p[1])/2);
               this.goto(p);
            } else {
                super.goto(pt);
                this.ps = p;
                this.pt = pt;
            }
        }
        position() { return this.ps; }
    }
    return new Tortoise(x,y);
}