Cool Thingy

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(0);

}

var x=300

var y=100

var yspeed=0

var xspeed=3

function draw() {

  for(let i=0; i<100; i++){

    // if(y<height+50){

  stroke(255,0,0,50)

line (width/2,0,x,y)

  x+=xspeed

  if (x>width-300) {yspeed+=0.1;xspeed-=0.1;if (xspeed<=0){yspeed=0;xspeed=-3}}

  if (x<=300) {yspeed+=0.1;xspeed+=0.1;if (xspeed>=0){yspeed=0;xspeed=3}}

  y+=yspeed

    //}

}}