color red,green,blue;
int textX=800,stage;
class ball
{
  int x,y,speedX=0,speedY=0,Width=(int)random(200,300),iFrames;
  color fill;
  void movement()
  {
    if(iFrames==0)
    {
    if(y >= height-(Width/2) ||y <=0+(Width/2))speedY=-speedY;
    if(x >= width-(Width/2) ||x <=0+(Width/2))speedX=-speedX;
    }
    else iFrames--;

    x=x+speedX;
    y=y+speedY;
  }
  void render()
  {
    fill(fill);
    ellipse(x,y,Width,Width);
  }
}

ball a = new ball();
ball b = new ball();
ball c = new ball();
ball d = new ball();

void setup()
{
  size(1000,800);
  red=(int)random(255);
  green=(int)random(255);
  blue=(int)random(255);
  a.x=200;
  a.y=200;
  b.x=600;
  b.y=200;
  c.x=200;
  c.y=600;
  d.x=600;
  d.y=600;
}

void draw()
{
  background(red,green,blue);
  fill(255);
  text("julius janeliunas",textX,10);
  if(stage==0)
  {
  if(textX>0)textX=textX-5;
  else stage++;
  println(stage);
  }
  if(stage==1)
  {
    a.movement();
    a.render();
    b.movement();
    b.render();
    c.movement();
    c.render();
    d.movement();
    d.render();
  }
  if(dist(a.x,a.y,b.x,b.y)<a.Width/2+b.Width/2)
  {
    a.speedX=-a.speedX;
    a.speedY=-a.speedY;
    b.speedX=-b.speedX;
    b.speedY=-b.speedY;
    a.iFrames=10;
  }
  if(dist(a.x,a.y,c.x,c.y)<a.Width/2+c.Width/2)
  {
    a.speedX=-a.speedX;
    a.speedY=-a.speedY;
    c.speedX=-c.speedX;
    c.speedY=-c.speedY;
  }
  if(dist(a.x,a.y,d.x,d.y)<a.Width/2+d.Width/2)
  {
    a.speedX=-a.speedX;
    a.speedY=-a.speedY;
    d.speedX=-d.speedX;
    d.speedY=-d.speedY;
  }
}

void keyPressed()
{
  if(key=='b')
  {
  a.fill=#FF0000;
  b.fill=#FFFF00;
  c.fill=#FFFFFF;
  d.fill=#000000;
  }
  if(keyCode==115)
  {
  a.speedX=(int)random(5,15);
  b.speedX=(int)random(5,15);
  c.speedX=(int)random(5,15);
  d.speedX=(int)random(5,15);
  a.speedY=(int)random(5,15);
  b.speedY=(int)random(5,15);
  c.speedY=(int)random(5,15);
  d.speedY=(int)random(5,15);
  }
}