[TDO2000]

hmmm I don't really know a formular for this but a way to emulate something like this is able with using vars for vertical and horizontal movement...

something like this for example:

NPC Code:

---

if(playerenters){

  this.vx=1;

  this.vy=-1;

  timeout=.05;

}



if(timeout){

  if(!onwall(x+(width/2)+this.vx+(.025*this.vx),y+height/2)){x+=this.vx;}

  else {this.vx=this.vx*(-1);}



  if(!onwall(x+(width/2),y+(height/2)+this.vy+(.025*this.vy))){y+=this.vy;}

  else {this.vy=this.vy*(-1);}



  timeout=.05;

}

---

it's like the pong ball