You are just getting started and already have a pro version of GS?
Strange, but if so, lucky you...
Look at the manual for 'accelerate'.
Here is how you can use it:
action plane()
{
VECTOR force;
VECTOR dist;
while(1)
{
force.x = 10 * key_force.x * time_step; // play with 10
accelerate(dist.x,force.x,0.5); // play with 0.5 (lower it)
c_move(my,dist,nullvector,IGNORE_PASSABLE|GLIDE);
wait(1);
}
}
