let l = 5;

let speeed = 100;

let crossesCount, doesntCrossCount;

let pieP;

​

function setup() {

    createCanvas(400, 400);

    background(0);

    stroke(255);

    for (let x = 0; x <= width; x += t) {

    line(x, 0, x, height);

    }

    crossesCount = 0;

    doesntCrossCount = 0;

    pieDiv = createDiv("0.0");

}

​

function draw() {

    for (let n = 0; n < speeed; ++n) {

    let x0 = random(width);

    let x1 = random(width);

    let y0 = random(height);

    let y1 = random(height);

    let xc = (x0 + x1) / 2;

    let yc = (y0 + y1) / 2;

    let dst = dist(x0, y0, x1, y1);

    let scl = l / dst;

    let nx0 = xc + (x0 - xc) * scl;

    let ny0 = yc + (y0 - yc) * scl;

    let nx1 = xc + (x1 - xc) * scl;

    let ny1 = yc + (y1 - yc) * scl;

​

    let closest = round(xc / t);

    let closestX = closest * t;

​

    if( (nx0 < closestX && nx1 > closestX) ||

        (nx1 < closestX && nx0 > closestX) ) {

        ++crossesCount;

        stroke(0,255,0);

    } else {

        ++doesntCrossCount;

        stroke(255,0,0);

    }

    line (nx0, ny0, nx1, ny1);

    }

    let prob = crossesCount / (crossesCount + doesntCrossCount);

    let pie = 2 * l / (prob * t);

    //    console.log(pie);

    pieDiv.html(pie);

}

​