// CSC220F19DemoB_Function Parson's csc120 recap
int elx, ely ;
int exspeed, eyspeed ;
int ewidth = 75, eheight = 50 ;

// setup() called once at the start of Run
void setup() {
  size(500, 500);  // At a minimum set display window size in setup().
  frameRate(60);    // Must be explicit in newer Macs after setting size.
  elx = width / 2 ;
  ely = height / 3 ;
  exspeed = 5 ;
  eyspeed = -3 ;
  rectMode(CENTER);
  ellipseMode(CENTER);
}

// draw() is called in a loop at the frameRate, defaults to once every 60th sec.
void draw() {
  background(255, 255, 0);  // screen color, use Tools -> Color Selector, RGB
  display();  // function call to the display() function to display avatar
  move(); 
}

void display() {
  // display my avatar
  stroke(0, 0, 255); // Sets stroke around shapes, alternatively noStroke()
  fill(255, 128, 0); // Sets fill within closed shape, alternatively noFill()
  ellipse(elx, ely, ewidth, eheight); // X, Y, Ewidth, Eheight
  stroke(0);
  fill(255);
  rect(elx, ely, ewidth/2, eheight/2);
}

void move() {
  // move my avatar
  elx = elx + exspeed ;
  ely += eyspeed ;
  if (elx > width+ewidth) {
    // if horizontal loc is off right side of display
    exspeed = - exspeed ;  // reverse direction
  } else if (elx < 0-ewidth) {
    // if horizontal loc is off left side of display
    exspeed = - exspeed ;
  }
  if (ely < 0-eheight || ely > height+eheight) {
    // if vertical off top or bottom
    eyspeed = - eyspeed ;
  }
}