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In SWiSH MAX and Flash MX, the variables always have a path, where
they are defined/creaetd. And they visible (by other scripts in movie)
in that path by default.
For example if we define a variable as x=15; on first
frame of the movie (in main timeline), all the scripts (either on frames
or even buttons' action), will be using variable 'x' directly.
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e.g.
x=x+10;
or
x+=10;
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Note : Read this part more carefully.
1. Now the problem is "how to use variable 'x' in sprite
which is created within the main timeline?".
The answer is very simple! Just use path of the variable 'x' to access
it as :
Why did we attach '_root.' with variable name?
Because the variable 'x' was defined in main timeline (root of movie).
2. If you have defined a variable 'y' in the timeline of
a sprite 'myspr' and you want to use variable 'y' in main timeline script
(either on frame or on button's action);
It is so simple;
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use
[color=blue]myspr.y=135;[/color]
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The path to variable is actaully '_root.mysprite.y' in current level (_level0.mysprite.y).
[quote]
Note : if you want to learn about levels please [CLICK HERE
[/quote]
We referred only 'myspr.y' because our script (accessing the variable) was
in root, so there is no need to add compelte path.
In case, we have another sprite 'myspr2', and from within that we want to
access variable 'y' previously defined in sprite 'myspr';
WHAT WILL WE DO ?
We will use absolute path of variable 'y' which becomes
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_root.myspr.y=786;
or
_parent.myspr.y=786;
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WHAT IS '_parent'?
_parent is used to reffer the any object or variable created in Parent Path
to current Path (either _root or sub sprite).
Concept would be more clear by below image
[img]http://www.swish-db.com/Board/attach/tut4i1.gif[/img]
For example you have a sprite in main timeline named 'pspr' which contains
further one sprite in it named 'cspr'.
Now you have defined a variable in timeline of 'pspr' as
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onframe(1) {
var_name = "the value is swish-db";
}
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and you wish to access it in 'cspr', HOW TO DO THAT ?
Whenever we need to reffer any variable or object in 'pspr' from 'cspr'
(in timeline of 'cspr'), we will be using
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_parent.var_name = "now the value is db-board";
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3. Uses of 'this'
'this' reffers to current sprite, as compairing to _parnet and _root, which
reffer to some absolute path in movie.
It is especially used when we need to load or send variables from
out-resources (may be a PHP/ASP script) to SwiSH MAX.
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e.g.1.
this.loadVariables("script.asp",'GET');
// To send variables of current path to 'script.asp' via GET method.
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e.g.2.
this.myvar = "this is my new value";
// Assign a text/string value to variable in current path!
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Using paths with variables or objects is a good programming approach,
which prevents/eleminates the chances ambiguity or tow/more variables
of same name defined in different paths.
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