​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

​

  noFill();

  beginShape();

  for( let i = 0; i < points.length; i++){

    vertex(points[i].x, points[i].y);

  }

  endShape();

}

​

function mouseClicked()

{

  points.push({

    x: mouseX,

    y: mouseY

  })

  console.log(points);

}

​

function keyPressed()

{

  if( key == " "){

    points = [];

  }

}