// variables & new types
class Bunny {
  float x, y;     // coordinate of bunny
  float dx, dy;   // x and y speed of bunny
  boolean isLeft; // orientation of bunny   
  int count;      // how many times the bunny
  // banged its head on a wall
}


int num;           // number of bunnies
Bunny [] bunnies;  // array to hold all num bunnies
PImage leftB, rightB;


// initialization
void setup() {
  size(600, 400);
  rightB = loadImage("right.png");
  leftB  = loadImage("left.png");

  // Create the array that will hold all the bunnies.
  // This just makes the array it does not make any
  // actual bunnies (instances of Bunny type)
  bunnies = new Bunny[20]; 

  // populate the array with actual bunnies
  for (int i=0; i<20; i+=1) {
    // create a bunny
    bunnies[i] = new Bunny();

    // set random coordinates for bunny
    bunnies[i].x = random(50, width-50);
    bunnies[i].y = random(50, height-50);

    // set random speed for bunnies
    bunnies[i].dx = random(0.5, 2.5);
    bunnies[i].dy = 0.0;
    
    // set random direction
    bunnies[i].isLeft = (random(1) < 0.5);
  }
}

// main program
void draw() {
  background(127);
  for (int i=0; i<20; i+=1) {
    // draw the bunny
    if (bunnies[i].isLeft)
      image( leftB, bunnies[i].x, bunnies[i].y);
    else
      image( rightB, bunnies[i].x, bunnies[i].y);

    // update bunny location    
    if (bunnies[i].isLeft) {
      if (bunnies[i].x < 50) {
        bunnies[i].isLeft = false; // turn around
        bunnies[i].count += 1;
        bunnies[i].dx *= random(0.8, 1.75);
        if (bunnies[i].dx > 25) bunnies[i].dx = 25;
        bunnies[i].x += bunnies[i].dx;
      }
      else {
        bunnies[i].x -= bunnies[i].dx;
      }
    }
    else {
      if (bunnies[i].x > width-50) {
        bunnies[i].isLeft = true; // turn around
        bunnies[i].count += 1;
        bunnies[i].dx *= random(0.8, 1.75);
        if (bunnies[i].dx > 25) bunnies[i].dx = 25;
        bunnies[i].x -= bunnies[i].dx;
      }
      else {
        bunnies[i].x += bunnies[i].dx;
      }
    }
  }
}