​

function setup() {

  createCanvas(1920,1080);

  fullscreen(true);

}

​

function draw() {

  background(220);

  if (mM && mouseIsPressed){

    lines.push(createVector(mouseX,mouseY));

    lines.push(createVector(pmouseX,pmouseY));

  }

  if (lines !== []){

    for (let i = 1; i<lines.length; i+= 2){

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

    }

  }

}

​

//mouse moved true or fasle

  function mM(){

    if(mouseX !== pmouseX || mouseY !== pmouseY){

      return true;

    } else {

      return false;

    }

  }

​