int circle =0;
int speed =5;

void setup() {
  size(400, 600);
}

void draw() 
{
  background(0);
  //change x by speed
  circle = circle + speed;
  
  //if we have reached the reverse speed
    if ((circle > 400) || (circle < 0))
{
    
  speed = speed * -1;
} 
  // display a circle
   fill(150);
   stroke(0);
  
  
   fill(0, 0, 255);   
   //--  rect(60, 100, 30, 60);
   noStroke();
   triangle( 60,100, 192,100, 230,400 );
   triangle( 188,100, 230,400, 360, 400 );

  fill(255,0,0);   
  beginShape();
  vertex(60,300);
  vertex(90, 300);
  vertex(160, 500);
  vertex(130, 500);
  endShape(CLOSE);
   

   fill(255, 0, 100);
   ellipse(circle, 500, 35, 35);
   fill(255, 255, 0);
   ellipse(mouseX/2, mouseY/2, 150, 100);
}