Determining walkable areas...

[OldManPete]

This is probably a really easy question, but I've searched though the manual and I don't think I can find what I'm looking for...

What I was wondering if there is a way to tell if a certain coordinate is a walkable area....

For examle:

IF (character.x - 25) is a walkable area{
     do something
ELSE
     character.StopMoving()
}

Any help'd be greatly appreciated.... Thanks

[Gilbert]

GetWalkableAreaAt()