// method to handle keyboard events
void keyPressed()
{
    
  if(keyCode == LEFT) // change image
    activeImg--;
  if(keyCode == RIGHT) // change image
    activeImg++;
  if(activeImg >= img.length)
    activeImg = 0;
  if(activeImg < 0)
    activeImg = img.length-1;
  if(key == 'a') // artificial intelligence
    if(ai == true)
      ai = false;
    else
      ai = true;
  if(key == 'u') // outline
     if(outline)
       outline = false;
     else
       outline = true;
  if(key == 'l') // loupe
    if(loupe)
      loupe = false;
    else
      loupe = true;
  if(key == 'm') // magnet
    if(come)
      come = false;
    else
      come = true;
  if(key == 's') // statistics
    if(showStatistic)
      showStatistic = false;
    else
      showStatistic = true;
  if(key == 'f') // reproduction
    if(reproduction)
      reproduction = false;
    else
      reproduction = true;
  if(key == 'n') // reaload images
    loadImages();
  if(key == 'k') // kill all
    killAll();
  menu();
}


// method to handle mouseklicks
void mousePressed()
{
  if(mouseX<500) // add new worm
  {
    population.add(new worm(area.width * mouseY + mouseX, img[activeImg].get(mouseX, mouseY))); // add new worm to population
    lengthSlider.active = false;
  }
  if(mouseX > speedSlider.left && mouseX <  speedSlider.right  && mouseY >  speedSlider.top && mouseY <  speedSlider.bottom) // speedslighter event
  {
    speedSlider.drag(mouseX);
    speedSlider.dragged = true;
    speed = speedSlider.value;
  }
  if(mouseX > lengthSlider.left && mouseX <  lengthSlider.right  && mouseY >  lengthSlider.top && mouseY <  lengthSlider.bottom && lengthSlider.active) // lengthslider event
  {
    lengthSlider.drag(mouseX);
    lengthSlider.dragged = true;
    maxWormLength = lengthSlider.value;
  }
  speed = ceil(sqrt((float)((float)maxWormLength / 1000) * speedSlider.value)); // calculate speed
  if(mouseX > img[activeImg].width+29 && mouseX < img[activeImg].width+29+39*5 && mouseY > 57 && mouseY < 57 + 34) { // Image Navigation event
    activeImg = floor((mouseX-(img[activeImg].width+29))/39);
  }
  menu();
}

void mouseDragged()
{
  if(speedSlider.dragged)
    speedSlider.drag(mouseX);
  if(lengthSlider.dragged && lengthSlider.active)
    lengthSlider.drag(mouseX);
  speed = ceil(sqrt((float)((float)maxWormLength / 1000) * speedSlider.value));
  maxWormLength = lengthSlider.value;
}

void mouseReleased()
{
  speedSlider.dragged = false;
  lengthSlider.dragged = false;
}