let size = 800;

let trees = [];

​

function setup() {

  createCanvas(size, size);//, WEBGL);

  background(220);

​

  // for (let _ = 0; _ < 5; _++) {

    let startPoint = [width/2,height-1]//[random(size * 0.25, size*0.75), random(size*0.25,size*0.75)];

    let length = randomBetween(90, 120);

    let weight = randomBetween(20, 35);

    strokeWeight(weight);

    stroke(30);

    let branchAngle = PI / 2;

    branch(startPoint, weight, length, branchAngle);

  // }

  // Scale brushes to adapt to canvas size

    // brush.scaleBrushes(1.5)

​

    // Activate the flowfield we're going to use

    // brush.field("seabed")

}

​

function draw() {

  // orbitControl();

}

​

function branch(startPoint, weight, length, angle) {

  // 𝑥1=𝑥+𝑛cos𝜃

  // 𝑦1=𝑦+𝑛sin𝜃

  let x1 = startPoint[0] + length * cos(angle);

  let y1 = startPoint[1] - length * sin(angle);

  let endpoint = [x1, y1];

​

  strokeWeight(weight);

  line(startPoint[0], startPoint[1], endpoint[0], endpoint[1]);

​

  let angleMax = angle + PI / 4;

  let angleMin = angle - PI / 4;

  let angleDiff = randomBetween(0, angleMax - angleMin - PI / 16);

  let angle1 = angleMax - angleDiff / 2;

  let angle2 = angleMin + angleDiff / 2;

  let newWeight = randomBetween(weight * 0.6, weight * 0.8);

  let newLength = randomBetween(length * 0.7, length * 0.9);

​

  if (newLength < 3) {

    return;

  }

​

  branch(endpoint, newWeight, newLength, angle1);

  branch(endpoint, newWeight, newLength, angle2);

}

​

function randomBetween(low, high) {

  return random(high - low) + low;

}

​