>>>>on mouseUp me
>>>>global gMoveAmt
>>>>set myIndex = 1
>>>>repeat while not the mouseDown
>>>>setMoveAmt = setAt (gMoveAmt, myIndex)
>>>>set myIndex = myIndex +1
>>>>if myIndex > 100 then exit repeat
>>>>end repeat
>>>>end
>>>
>>>That's a repeat loop. Not optimum, but better than the first.
>>
>>May I know where my mistake lies?
>
>Sure. I'm not sure why you're checking for the mouseDown.
The purpose of using �repeat while not the mouse Down� is so that a
mouseDown event would interrupt the repeat loop.
I mustn�t do this?
>If that's not relevant, this would be a bit faster:
>
>repeat with myIndex = 1 to 100
> setMoveAmt = setAt(gMoveAmt, myIndex)
>end repeat
>
You mean write it like this:
On MouseUp me
repeat with myIndex = 1 to 100
setMoveAmt = setAt(gMoveAmt, myIndex)
end repeat
end
>A couple of comments. You do realize that you're building a list, right?
I�m not trying to build a list, I�m trying to move sprites. Many times, I
have difficulty trying to create what I want. It�s tough.
>Actually, that code won't work, because setAt requires 3 parameters--the
>list, the position, and the value. setMoveAmt will contain only TRUE or
>FALSE, the result of the setAt operation. Did you mean to use getAt?
Thanks for explaining. The getAt function is used to retrieve a particular
value from a list
by specifying the position the value occupies in that list?
I checked both the lingo dictionary as well as Special Edition using
Macromedia Director 8 but they use it only in this context::
(from the Lingo Dictionary)
Example This statement causes the Message window to display the third item
in the answers list, which consists of [10, 12, 15, 22]:
put getAt(answers, 3)
-- 15
However, I don�t think this is what you mean?
Is this the way to use the getAt function?
On MouseUp me
Repeat with myIndex = 1 to 100
gMoveAmt .getAt( )
end repeat
end
>property pMyLocH
>
>on beginSprite
> pMyLocH = sprite(me.spriteNum).locH
>end
>
>on getMyLocH
> return pMyLocH
>end
>
>In that example, you have one behavior, but 100 different values for
>pMyLocH--one for each sprite.
In Lingo in a Nutshell, Pg 331, Bruce Epstein has thoroughly confused me:
�Property variables ( beginning with the letter �p� for clarity ) are used
instead
of global variables. Properties are declared with the keyword property,
and can contain a different value for each instance of the object (that is,
each timer). If we used global, multiple timers would trample the values
held in the globals.�
Do you understand what he is writing?
What is the meaning of the last line? i.e. �if we used global,�held in the
globals�?
Can I safely say that a property is a characteristic of an object and in
your example above MyLocH is the property?
>Globals, on the other hand, are not inherently bad unless used to excess.
When is it used to excess?
>Just remember that their value will be the same no matter where you are.
Yes.
>
>>>>1. What is the meaning of [:] ? I notice it is used in
>>>>getPropertyDescriptionLists.
>>>
>>>That declares an empty property list.
>>
>>The purpose of declaring an empty property list is to add items to the
>>list. You didn't do that, you just defined it immediately?
>
>It's always best to initialize variables.
on getPropertyDescriptionList
if the currentSpriteNum = 0 then exit
return \
[ \
#pMoveAmt: \
[ \
#comment: "Distance to move? ", \
#format: #integer, \
#default: 5 \
] \
]
end getPropertyDescriptionList
The [:] ensures that the variable is a property list, and that it is empty.
If you try to add a
>property and value to an uninitialized variable, it will return an error
>because it's not a property list.
I�m sorry, but I don�t think you initialized variables in the example
above?
A variable is created the first time you assign a value to it, this is
known as initializing a variable.
When I use the getPropertyDescriptionList handler, am I going into Object
Oriented programming?
Thanks very much
Genevieve
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