createCanvas(400, 400);

}

​

​

function draw(){

  background(0);

  translate(width / 2, height / 2);

  let pos = createVector(200, 200);

  let mouse = createVector(mouseX, mouseY);

  let v = p5.Vector.sub(mouse, pos);

//   v.normalize();

//   v.mult(50);

  v.setMag(50);

  strokeWeight(4);

  stroke(255);

  line(0, 0, v.x, v.y);

}