// rotate and reposition a spike!
switch argument0 {
case 'up':
    image_angle = 0
    x += 16
    y += 16
    break
case 'right':
    image_angle = 270
    x += 15
    y += 16
    break
case 'left':
    image_angle = 90
    x += 16
    y += 15
    break
case 'down':
    image_angle = 180
    x += 15
    y += 15
    break
}