ddmyx/scripts/FlyingAI/FlyingAI.gml

function enemy_flying_ai()
{
	x_spd = facing * x_base_spd;
	y_spd = facing_y * y_base_spd;
	
    if place_meeting(x, y + y_spd, oParentSolid)
    {
        while !place_meeting(x, y + sign(y_spd), oParentSolid)
            y += sign(y_spd);
			
		facing_y = -facing_y;
    }
    if place_meeting(x + x_spd, y, oParentSolid)
    {
        while !place_meeting(x + sign(x_spd), y, oParentSolid)
            x += sign(x_spd);
	
		facing = -facing;
    }
    set_sprite(sEnemyFlying);
}