zp

function setup(){

  createCanvas(windowWidth, windowHeight);

}

​

function draw (){

  background(35);

  for(let x=0;x<width;x=x+20){

  line (x,0,mouseX,mouseY)

  line (x,height,mouseX,mouseY)

  } 

  strokeWeight(5);

  stroke(0,127,255);

  point(mouseX,mouseY);

  line(0,0,mouseX,mouseY);

  line(width,height,mouseX,mouseY);

  line(0,height,mouseX,mouseY);

  line(width,0,mouseX,mouseY);

}