code 4 wille

if(x <= 0 )
{
    x = xstart;
    y = ystart;
    global.pointsB ++;

    hspd = choose(2,3,4);
    vspd = choose(2,3,4);

    hspeed = choose(-hspd,hspd);
   vspeed = choose(-vspd,vspd);
}

if( x >= room_width)
{
    x = xstart;
    y = ystart;
    global.pointsA ++;

    hspd = choose(2,3,4);
    vspd = choose(2,3,4);

    hspeed = choose(-hspd,hspd);
    vspeed = choose(-vspd,vspd);
}