//Declare variables (put at the beginning outside of any command) 
// keep track of the location of rectangles
int xpos = 0;   // horizontal (x) position left square
int ypos = 1;   // vertical (y)position left square
int xpos2 = 1024;
int ypos2 = 8;
int w = 20; //square width
int h = 8; // square height
int speed = 1; //speed of square movement per pixel
boolean moveit_right = true;
boolean moveit_left = true;

// Code that runs forever goes here -set up the applet
void setup() {
  size(1024,17); // applet size
  framerate(30); // speed of animation
}


void draw(){
  background(150); // bg color
  
 // drawing the squares
noStroke(); 
fill(#66ff33); //square on the left
rect(xpos, ypos, w, h);
smooth ();
noFill();

noStroke(); 
fill(#66ff33); //square on the right
rect(xpos2, ypos2, w, h);
smooth ();
noFill();

xpos = xpos + speed; //left square moving right
     
   if (moveit_right == true) {
    xpos = xpos + 5;
  } 
  else {  // else going left subtract 5
    xpos = xpos - 5;
  }

  // if on right edge start going left
  if (xpos > width) {
    moveit_right = false;
  }
  // if on left edge start going right
  else if (xpos < 0) {
    moveit_right = true;
  }


xpos2 = xpos2 - speed; // right square moving left
  
   if (moveit_left == true) {
    xpos2 = xpos2 + 5;
  } 
  else {  // else going left subtract 5
    xpos2 = xpos2 - 5;
  }

  // if on right edge start going left
  if (xpos2 > width) {
    moveit_left = false;
  }
  // if on left edge start going right
  else if (xpos2 < 0) {
    moveit_left = true;
  }


}