Game Development Community

Scope question

by Alex Head · in Torque Game Builder · 02/20/2011 (1:32 pm) · 1 replies

While going over the documentation tutorials i noticed that within a script functions are either explicitly scoped or not and I do not know why.

for example in the fish game player.cs script there is "function PlayerFish::updateMovement()" and "function FishPlayerUp()". Both functions are usable only by the PlayerFish class, so why the diffrence?
NextNext Thread
PrevPrevious Thread
More from Torque Game Builder


Torque Owner Chris Labombard
Premium Preferred
#1
02/21/2011 (5:44 am)
PlayerFish:: functions can be called like this

%obj = new t2dStaticSprite()
{
scenegraph = t2dScene;
class = "PlayerFish";
};

%obj.updateMovement();

Only playerFish can do that because they have the class name.

You can explicitly call

PlayerFish::updateMovement(%differentObject);

since the function is defined as:
function PlayerFish::updateMovement(%this)

....

If you used function FishPlayerUp(%this) you would have to call it as

%obj = new t2dStaticSprite()
{
scenegraph = t2dScene;
class = "PlayerFish";
};

fishPlayerUp(%obj);

for every single object. Not very convenient, especially with callbacks. For example you could have an onPositionTarget callback after calling moveTo on a t2d object.... Then when your obejct gets where it's moving it calls the callback. If you had a FishPlayer class static sprite then it would call:

function FishPlayer::onPositionTarget(%this)

which you can define in your code to do custom code for the FishPlayer only.

Hope this helps.