​

function setup() {

  createCanvas(windowWidth, windowHeight);

}

​

function draw() {

  background(220, 20, 120);

​

  // draw

  for (let i = 1; i < mPos.length; i++) {

    line(mPos[i].x, mPos[i].y, mPos[i - 1].x, mPos[i - 1].y);

  }

}

​

function mouseMoved() {

  mPos.push({ x: mouseX, y: mouseY });

}

​