let opening=199;

let position=225;

​

function setup() 

{

  createCanvas(800, 600);

}

​

​

function draw()

{

  if((x_axis!=1))

  {background(255);

    noStroke();

    fill(100,100,100);

    rect(x_axis,0,50,450);

  fill(255);

  rect(x_axis,opening,50,100);

  }

  else

  {x_axis =949;

   opening=random(0,349);

   }

  fill(0,100);

  rect(949,0,50,450);

  rect(0,0,50,450);

  x_axis-=3;

  fill(255,0,0);

  ellipse(199,position,30,30);

  position=position+2;

  if(!((opening<=position)&&(position<=opening+100))&&(x_axis<=199)&&(x_axis>=149))

  {noLoop();}

  if(position==449||position==0)

  {

    noLoop();

  }

  if(mouseIsPressed)

    {

      if(position!=0)

        position-=5;

}

    }

​

​

​