View difference between Paste ID: DFxktzKh and H2HmBEfa

 if y < 0 {
     vspeed = abs(vspeed)
 }
 if y > room_height {
     vspeed = -abs(vspeed)
 }
 if x < 0 {
     hspeed = abs(hspeed)
 }
 if x > room_width {
     hspeed = -abs(hspeed)
 }