RE: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
I think your code won't center correctly does it? Don't know if []
syntax is slower than creating a local var fisrt, but just in case added
it.
function center(ob1:MovieClip, ob_ar:Array) {
var x:Number = ob1._x - (ob1._width/2);
var y:Number = ob1._y;
for (var i = 0; iob_ar.length; i++) {
var mc : MovieClip = on_ar[i];
mc._x = x + (mc._width/2);
mc._y = y + (mc._width/2);
}
}
Top of my head, didn't test it.
Ben Smeets
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Alistair
Colling
Sent: vrijdag 11 mei 2007 13:41
To: flashcoders@chattyfig.figleaf.com
Subject: [Flashcoders] Quick syntax q: how to write a function that
canreceive an undefined number of parameters
Hi there, just a quick syntax question, I want to receive a function
that will centre the position of all objects passed to that of the first
object passed but the number of objects passed may vary. This is the
syntax I am currently using, is this the best way to do it?
Thanks for any comments in advance :)
Ali
//ob1 is the object that the objects in the array centre themselves to
public static function center(ob1:Object, ob_ar:Array) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 0; iob_ar.length; i++) {
ob_ar[i]._x = targetX+(ob1._width/2);
ob_ar[i]._y = targetY+(ob1._width/2);
}
}
center(myMC, [myMC2, myMC3, myMC4]);
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RE: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
The parameters received by a function are automatically stored in a built-in
array called arguments. So you can do something like this:
public static function center(obj1:Object) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 1; iob_ar.length; i++) {
arguments[i]._x = targetX+(ob1._width/2);
arguments[i]._y = targetY+(ob1._width/2);
}
}
}
Btw, obj1 doesn't have to be passed seperately either - you can use
var targetX:Number = arguments[0]._x; - but there's no reason to do so in
your code, and this way the method is a bit more clear.
The only caveat is that, depending on the rest of your code, if you have to
pass an unknown number of movie clips, there's a chance your original
function might actually make more sense...
Cheers,
Karina
-Original Message-
From: Alistair Colling [mailto:[EMAIL PROTECTED]
Sent: 11 May 2007 12:41
To: flashcoders@chattyfig.figleaf.com
Subject: [Flashcoders] Quick syntax q: how to write a
function that canreceive an undefined number of parameters
Hi there, just a quick syntax question, I want to receive a
function that will centre the position of all objects passed
to that of the first object passed but the number of objects
passed may vary. This is the syntax I am currently using, is
this the best way to do it?
Thanks for any comments in advance :)
Ali
//ob1 is the object that the objects in the array centre
themselves to public static function center(ob1:Object, ob_ar:Array) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 0; iob_ar.length; i++) {
ob_ar[i]._x = targetX+(ob1._width/2);
ob_ar[i]._y = targetY+(ob1._width/2);
}
}
center(myMC, [myMC2, myMC3, myMC4]);
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Re: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
Thanks Karina this is the sort of thing I was looking for, as you say
it may be clearer to code this fn the way I initially said but I was
interested in how to code this another way so thanks for helping me.
One tiny typo, before someone else does-
for (var i = 1; iarguments.length; i++)
Thanks again :)
Ben, thanks for your help too, I hadn't thought of only using the
square brackets to make the code more efficient.
Ali
On 11 May 2007, at 15:32, Karina Steffens wrote:
The parameters received by a function are automatically stored in a
built-in
array called arguments. So you can do something like this:
public static function center(obj1:Object) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 1; iob_ar.length; i++) {
arguments[i]._x = targetX+(ob1._width/2);
arguments[i]._y = targetY+(ob1._width/2);
}
}
}
Btw, obj1 doesn't have to be passed seperately either - you can use
var targetX:Number = arguments[0]._x; - but there's no reason to do
so in
your code, and this way the method is a bit more clear.
The only caveat is that, depending on the rest of your code, if you
have to
pass an unknown number of movie clips, there's a chance your original
function might actually make more sense...
Cheers,
Karina
-Original Message-
From: Alistair Colling [mailto:[EMAIL PROTECTED]
Sent: 11 May 2007 12:41
To: flashcoders@chattyfig.figleaf.com
Subject: [Flashcoders] Quick syntax q: how to write a
function that canreceive an undefined number of parameters
Hi there, just a quick syntax question, I want to receive a
function that will centre the position of all objects passed
to that of the first object passed but the number of objects
passed may vary. This is the syntax I am currently using, is
this the best way to do it?
Thanks for any comments in advance :)
Ali
//ob1 is the object that the objects in the array centre
themselves to public static function center(ob1:Object,
ob_ar:Array) {
var targetX:Number = ob1._x;
var targetY:Number = ob1._y;
for (var i = 0; iob_ar.length; i++) {
ob_ar[i]._x = targetX+(ob1._width/2);
ob_ar[i]._y = targetY+(ob1._width/2);
}
}
center(myMC, [myMC2, myMC3, myMC4]);
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Re: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
i-- will eventually become 0 which (in AS2) is evaluated to false.
so while(i--) works fine.
regards,
Muzak
- Original Message -
From: eka [EMAIL PROTECTED]
To: flashcoders@chattyfig.figleaf.com
Sent: Friday, May 11, 2007 6:33 PM
Subject: Re: [Flashcoders] Quick syntax q: how to write a function that
canreceive an undefined number of parameters
Hello :)
you don't limit your while loop instruction ?
while ( --i -1)
{
}
EKA+ :)
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Re: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
I think he was pointing out how the loop could be optimized even further.
Pre-decrementing is faster than post-decrementing.
However, his greater than comparison slows it down. The right way to do
it is:
while (--i -(-1))
{
}
since subtraction is faster than addition.
This is all academic, though. I used to use --i -(-1) but I gave it up
for the readability of while (i--).
This is my new favorite:
while (i--) i++;
;)
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Re: [Flashcoders] Quick syntax q: how to write a function that canreceive an undefined number of parameters
Hello :)
Yes it's funny .. i forget the 0 is a boolean in a conditional
instruction... the problem with this loop is the negative values. but it's a
good notation.
After tests... in AS2 this method is more speed.
var ar:Array = new Array(50) ;
var time ;
Key.addListener(this) ;
onKeyDown = function()
{
var result ;
var code:Number = Key.getCode() ;
var copy:Array = [].concat(ar)
var len:Number = copy.length ;
switch (code)
{
case Key.UP :
{
time = getTimer() ;
for( var i:Number = 0 ; ilen ; i++ )
{
result = copy[len] ;
}
time = getTimer() - time ;
trace( for speed : + time + ms) ;
break ;
}
case Key.DOWN :
{
time = getTimer() ;
while( len-- )
{
result = copy[len] ;
}
time = getTimer() - time ;
trace( while(len--) speed : + time + ms) ;
break ;
}
case Key.LEFT :
{
time = getTimer() ;
while( --len -1 )
{
result = copy[len] ;
}
time = getTimer() - time ;
trace( while(--len -1) speed : + time + ms) ;
break ;
}
case Key.RIGHT :
{
time = getTimer() ;
while( --len -(-1) )
{
result = copy[len] ;
}
time = getTimer() - time ;
trace( while(--len -(-1)) speed : + time + ms) ;
break ;
}
}
}
for speed : 329 ms
while(len--) speed : 305 ms
while(--len -1) speed : 324 ms
while(--len -(-1)) speed : 418 ms
Thanks :)
EKA+ :)
2007/5/11, Steven Sacks [EMAIL PROTECTED]:
I think he was pointing out how the loop could be optimized even further.
Pre-decrementing is faster than post-decrementing.
However, his greater than comparison slows it down. The right way to do
it is:
while (--i -(-1))
{
}
since subtraction is faster than addition.
This is all academic, though. I used to use --i -(-1) but I gave it up
for the readability of while (i--).
This is my new favorite:
while (i--) i++;
;)
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