[Flashcoders] bitwise question
When i have a 8 bit int where only one of the bit can be 1, what is then
the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i)) return i;
}
return 0;
}
Can this be done faster?
Jiri
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Re: [Flashcoders] bitwise question
Hey,
not sure if it's faster, but this would work as well:
var i:Number = 32;
trace (Math.log(i)/Math.LN2);
returns bit number 5.
Lookuptable might be faster in this case.
greetz
JC
On Tue, Sep 15, 2009 at 10:04 AM, Jiri jiriheitla...@googlemail.com wrote:
When i have a 8 bit int where only one of the bit can be 1, what is then
the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i)) return i;
}
return 0;
}
Can this be done faster?
Jiri
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Re: [Flashcoders] bitwise question
Jiri wrote:
When i have a 8 bit int where only one of the bit can be 1, what is
then the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
Can this be done faster?
Yes. Use a lookup table;
var lookup:Array=[];
for (var n:int=0; n128;n++)
{
lookup.push(0);
}
lookup[2]=1;
lookup[4]=2;
lookup[8]=4;
//etc..
function getBit(n:int):int{
return lookup[n];
}
Paul
Jiri
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Re: [Flashcoders] bitwise question
Paul Andrews wrote:
Jiri wrote:
When i have a 8 bit int where only one of the bit can be 1, what is
then the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
Can this be done faster?
Yes. Use a lookup table;
var lookup:Array=[];
for (var n:int=0; n128;n++)
{
lookup.push(0);
}
lookup[2]=1;
lookup[4]=2;
lookup[8]=4;
//etc..
function getBit(n:int):int{
return lookup[n];
}
LOL, better still, just ditch the function altogether and use
lookup[somevariable] directly.
I might as well comment that this is lean and mean without any safety
net to make sure the int is in range and indeed has only one bit set.
Paul
Jiri
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Re: [Flashcoders] closures
AS3 is based entirely on closures. Not sure what you mean by it being an option. Anthony Pace wrote: I was wondering if anyone here uses closures in AS3? I like them a ton; yet, I am wondering if they are ever used in a real world development projects in AS3? Can you see an excuse for using them? I know it does make somethings easier to port to and from JS if coded right. ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] bitwise question
Thnx, i tought that there would be some kind of smart bitwise operation
to do that. This will do fine. Cheers.
Jiri
Paul Andrews wrote:
Paul Andrews wrote:
Jiri wrote:
When i have a 8 bit int where only one of the bit can be 1, what is
then the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
Can this be done faster?
Yes. Use a lookup table;
var lookup:Array=[];
for (var n:int=0; n128;n++)
{
lookup.push(0);
}
lookup[2]=1;
lookup[4]=2;
lookup[8]=4;
//etc..
function getBit(n:int):int{
return lookup[n];
}
LOL, better still, just ditch the function altogether and use
lookup[somevariable] directly.
I might as well comment that this is lean and mean without any safety
net to make sure the int is in range and indeed has only one bit set.
Paul
Jiri
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Re: [Flashcoders] bitwise question
Another option:
function test(value:int):int {
// just to be safe...
value = value 0xff;
switch(value) {
case 0x01: return 0;
case 0x02: return 1;
case 0x04: return 2;
case 0x08: return 3;
case 0x10: return 4;
case 0x20: return 5;
case 0x40: return 6;
case 0x80: return 7;
default: return -1;
}
}
Cheers
Juan Pablo Califano
2009/9/15 Paul Andrews p...@ipauland.com
Paul Andrews wrote:
Jiri wrote:
When i have a 8 bit int where only one of the bit can be 1, what is then
the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
Can this be done faster?
Yes. Use a lookup table;
var lookup:Array=[];
for (var n:int=0; n128;n++)
{
lookup.push(0);
}
lookup[2]=1;
lookup[4]=2;
lookup[8]=4;
//etc..
function getBit(n:int):int{
return lookup[n];
}
LOL, better still, just ditch the function altogether and use
lookup[somevariable] directly.
I might as well comment that this is lean and mean without any safety net
to make sure the int is in range and indeed has only one bit set.
Paul
Jiri
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Re: [Flashcoders] bitwise question
Juan Pablo Califano wrote:
Another option:
function test(value:int):int {
// just to be safe...
value = value 0xff;
switch(value) {
case 0x01: return 0;
case 0x02: return 1;
case 0x04: return 2;
case 0x08: return 3;
case 0x10: return 4;
case 0x20: return 5;
case 0x40: return 6;
case 0x80: return 7;
default: return -1;
}
}
Cheers
Juan Pablo Califano
Yes, this is the best way to do it.
Paul
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Re: [Flashcoders] PHP Socket Question
Er, doesn't Flash Media Server do exactly what you want to do? I recommend Influxis hosting, pretty cheap FMS hosting and they're super developer friendly. You have to learn a bit of arcane server-side actionscript. It's actionscript 1, yurrk, with a weird API for manipulating sockets and server stuff, but it's fine once you get your head around it. hah just realised this was posted months ago. how helpful of me! 2009/7/22 John McCormack j...@easypeasy.co.uk http://www.tufat.com/s_flash_chat_chatroom.htm Thanks for that Glen, That looks really interesting. John Glen Pike wrote: You can use a database to store data in for a chat server, but you will need to have some kind of server side maintenance script to weed out the database. With a socket server system, you usually have to have a dedicated server, or at least one which lets you log into the shell and create scripts - most hosting does not let you run stuff like socket servers easily - which is why the database version may be used, because most hosting comes with this as standard. To test if your system could use a socket server, grab a free script and try exec()'ing it from a webserver PHP script to see if you could theoretically start and stop your server. I would guess most hosting locks this down and it may violate your TOS. Alternatively, look at hosted systems - Electrotank used to do a socket server and possibly provide hosting for that, it's in Java, but you would not have to write all that stuff... Also look at Moock's Multi-user Unity system - can't remember if that's useful or not. There is a program called Flash Chat for $5 which is probably worth looking at - http://www.tufat.com/s_flash_chat_chatroom.htm - there used to be a version called AMFIChat, but it has been discontinued (possibly because the guy was violating the terms of the AMF license) Anyway, in terms of time vs money $5 to spend looking at someone elses ready made system could be very cheap and you can see what server side stuff it does too. Omar Fouad wrote: hey, My boss asked me to develop a Cards Game called Estimation (I don't know if you heard about it). It is a Cards game similar to spades, where there are tricks, bids, etc. The game is going to be a Facebook application, so it is required a multi-player option (real time). At first I thought I would create a database and continuously let the client send queries using AMF, to check for changes and update the display. But a friend of mine told me this is insane. The data on the database he would buge, and I have to take in mind, that anyone could leave the game at anytime, so the data will remain in the database uselessly. He told me to use sockets, and store the variables I need, such as the rooms, the player nickname, the bids, the calls, the tricks, the scores, the rounds, the hands, and all the crap that I would need in the server side script (PHP). Is this true? If I will have to use sockets, should I store the data as variables in the server side script? I really need to figure out how to start. Thanks. ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] bitwise question
Jiri,
I haven't done much bit twiddling yet in AS3 but I think you were fast
already, but your i was being incremented and shifted.
Also i8 would only get you bits 2,1,0
In binary that would be i1000
How about:
function getBit(var numb:int):int {
var bit:int=1;
var count:int=0;
if (numb==0 || numb0x80) return -1; // error
while (bit numb == 0) {
1 bit;
count++;
}
return count;
}
John
Jiri wrote:
When i have a 8 bit int where only one of the bit can be 1, what is
then the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
Can this be done faster?
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Re: [Flashcoders] closures
JS style Function scope instead of classical oop. Steven Sacks wrote: AS3 is based entirely on closures. Not sure what you mean by it being an option. Anthony Pace wrote: I was wondering if anyone here uses closures in AS3? I like them a ton; yet, I am wondering if they are ever used in a real world development projects in AS3? Can you see an excuse for using them? I know it does make somethings easier to port to and from JS if coded right. ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] bitwise question
I think his i 8 was valid as the i is used for the shift, not the value...
The only thing that might be faster is using i-- rather than i++ - for
some reason decrementing through a loop is suppsoed to be faster.
Glen :)
John McCormack wrote:
Jiri,
I haven't done much bit twiddling yet in AS3 but I think you were fast
already, but your i was being incremented and shifted.
Also i8 would only get you bits 2,1,0
In binary that would be i1000
How about:
function getBit(var numb:int):int {
var bit:int=1;
var count:int=0;
if (numb==0 || numb0x80) return -1; // error
while (bit numb == 0) {
1 bit;
count++;
}
return count;
}
John
Jiri wrote:
When i have a 8 bit int where only one of the bit can be 1, what is
then the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
Can this be done faster?
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[Flashcoders] RegExp vs. CDATA in E4X
Hi list... I'm debating using a RegExp to search for a value in E4X, or do it by searching the below data within CDATA. I think the RegEx would be cooler to use, making for a smaller XML file, but I wonder if it would be faster to simply loop through an array of these values. Anyone have any thoughts? I think this would work, but I don't think it's foolproof: /A1E(3|4)\d[0-5]/i thanks, - Michael M. A1E441 A1E440 A1E433 A1E432 A1E431 A1E430 A1E422 A1E421 A1E410 A1E390 A1E370 A1E350 A1E340 A1E320 A1E300 A1E413 A1E412 A1E411 A1E402 A1E401 A1E400 A1E394 A1E393 A1E392 A1E391 A1E384 A1E383 A1E382 A1E381 A1E374 A1E373 A1E372 A1E371 A1E364 A1E363 A1E362 A1E361 A1E355 A1E354 A1E353 A1E352 A1E351 A1E345 A1E344 A1E343 A1E342 A1E341 A1E333 A1E332 A1E331 A1E330 A1E324 A1E323 A1E322 A1E321 A1E344 A1E343 A1E342 A1E314 A1E313 A1E312 A1E311 A1E310 A1E305 A1E304 A1E303 A1E302 A1E301 ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] closures
You mean like
button.onRelease = function() { trace(hello from + this);
obviously not in AS3, you would have to write few more lines...
I guess it's okay as long as it works and does what you want along with
the hope that you can easily fix it when it breaks in the latest browser
6 months down the line :)
Questions is/are:
Are you writing code you want to re-use?
Are you wanting to decouple stuff?
Are you wanting to make stuff easy to fix?
Are you just chucking something together?
There are loads of arguments for and against I guess, it's just what you
are happy working with and what suits the job.
Glen
Anthony Pace wrote:
JS style Function scope instead of classical oop.
Steven Sacks wrote:
AS3 is based entirely on closures. Not sure what you mean by it being
an option.
Anthony Pace wrote:
I was wondering if anyone here uses closures in AS3? I like them a
ton; yet, I am wondering if they are ever used in a real world
development projects in AS3?
Can you see an excuse for using them? I know it does make
somethings easier to port to and from JS if coded right.
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Re: [Flashcoders] bitwise question
It's a little curious loop!
i=0
i shifted = 0
i++ gives = 1 binary 0001
i shifted = 2 binary 0010
i++ gives i=3 binary 0011
i shifted=6 binary 0110
i++ gives i= 7 binary 0111
i shifted=14 binary 1110
End of loop because i=8
i++ gives i= 15 binary
i shifted= 30 binary 0001 1110
John
Glen Pike wrote:
I think his i 8 was valid as the i is used for the shift, not the
value...
The only thing that might be faster is using i-- rather than i++ - for
some reason decrementing through a loop is suppsoed to be faster.
Glen :)
John McCormack wrote:
Jiri,
I haven't done much bit twiddling yet in AS3 but I think you were
fast already, but your i was being incremented and shifted.
Also i8 would only get you bits 2,1,0
In binary that would be i1000
How about:
function getBit(var numb:int):int {
var bit:int=1;
var count:int=0;
if (numb==0 || numb0x80) return -1; // error
while (bit numb == 0) {
1 bit;
count++;
}
return count;
}
John
Jiri wrote:
When i have a 8 bit int where only one of the bit can be 1, what is
then the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
Can this be done faster?
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RE: [Flashcoders] closures
JS style Function scope instead of classical oop.
You mean like button.onRelease = function() { trace(hello from +
this);
(I know that was said tongue in cheek, so this is not a criticism...)
that's going back to AS1/AS2 anonymous functions - why would anyone in
their right mind, unless they had to target earlier versions of
Actionscript, want to go back to that?
Jason Merrill
Bank of America Global Learning
Learning Performance Soluions
Monthly meetings on making the most of the Adobe Flash Platform -
presented by bank associates, Adobe engineers, and outside experts in
the borader multimedia community - join the Bank of America Flash
Platform Community (note: this is for Bank of America employees only)
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Re: [Flashcoders] closures
Hi,
I was sort off slightly off the mark with my example, but having
read up on function closures in AS3 I can sort of see what Anthony
means...
From what I gather, Function Closures in AS3 are any functions /
methods, but people generally mean functions outside of classes when
they talk about function closures, so my example was sort of there
somehow..
Anyway, you may need global functions and package functions - I
guess these would be considered okay by most OOP people, whereas some
people may shun timeline code, although you can use it in AS3 and you
can do some very quick tests with it.
Like I said before, it's down to choice and whether it suits your
needs, so if you need to nest functions, or whatever, it might be easier
and more efficient to do so, it might not - depends on your brief/spec I
guess.
Sometimes just writing functional code is really nice and
therapeutic for me, but it never seems to scale very nicely beyond a
certain point (probably because I have learned too much about classes
and objects to go back).
Glen
Merrill, Jason wrote:
JS style Function scope instead of classical oop.
You mean like button.onRelease = function() { trace(hello from +
this);
(I know that was said tongue in cheek, so this is not a criticism...)
that's going back to AS1/AS2 anonymous functions - why would anyone in
their right mind, unless they had to target earlier versions of
Actionscript, want to go back to that?
Jason Merrill
Bank of America Global Learning
Learning Performance Soluions
Monthly meetings on making the most of the Adobe Flash Platform -
presented by bank associates, Adobe engineers, and outside experts in
the borader multimedia community - join the Bank of America Flash
Platform Community (note: this is for Bank of America employees only)
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--
Glen Pike
01326 218440
www.glenpike.co.uk http://www.glenpike.co.uk
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Re: [Flashcoders] RegExp vs. CDATA in E4X
You, sir, are a victim of premature optimization. Write it the easy way. If it proves to be a bottleneck later, optimize it then. ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
RE: [Flashcoders] RegExp vs. CDATA in E4X
Will do, sage advice. - MM Write it the easy way. If it proves to be a bottleneck later, optimize it then. ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Re: [Flashcoders] bitwise question
Can't confirm your findings right now, and also wonder which loop you
are talking about. My initially posted one?
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
or the one suggested by John McCormack. I cant remember have faulty
result with my loop because like Glen Pike mentioned the i is used for
the shifting.
Also the 8bit to test will always only have one bit set to 1. Which
could be a potential dangerous assumption i guess.
0001
0010
0100
etc..
Will do testing tomorrow.
jiri
John McCormack wrote:
It's a little curious loop!
i=0
i shifted = 0
i++ gives = 1 binary 0001
i shifted = 2 binary 0010
i++ gives i=3 binary 0011
i shifted=6 binary 0110
i++ gives i= 7 binary 0111
i shifted=14 binary 1110
End of loop because i=8
i++ gives i= 15 binary
i shifted= 30 binary 0001 1110
John
Glen Pike wrote:
I think his i 8 was valid as the i is used for the shift, not the
value...
The only thing that might be faster is using i-- rather than i++ - for
some reason decrementing through a loop is suppsoed to be faster.
Glen :)
John McCormack wrote:
Jiri,
I haven't done much bit twiddling yet in AS3 but I think you were
fast already, but your i was being incremented and shifted.
Also i8 would only get you bits 2,1,0
In binary that would be i1000
How about:
function getBit(var numb:int):int {
var bit:int=1;
var count:int=0;
if (numb==0 || numb0x80) return -1; // error
while (bit numb == 0) {
1 bit;
count++;
}
return count;
}
John
Jiri wrote:
When i have a 8 bit int where only one of the bit can be 1, what is
then the quickest way to get that bit position with value 1?
Now I use this.
function getBit():int{
var tCount:int = 0;
for (var i:int=0; i 8; i++) {
if (8 (1 i))return i;
}
return 0;
}
Can this be done faster?
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Re: [Flashcoders] bitwise question
Cheers.
Jiri
Paul Andrews wrote:
Juan Pablo Califano wrote:
Another option:
function test(value:int):int {
// just to be safe...
value = value 0xff;
switch(value) {
case 0x01: return 0;
case 0x02: return 1;
case 0x04: return 2;
case 0x08: return 3;
case 0x10: return 4;
case 0x20: return 5;
case 0x40: return 6;
case 0x80: return 7;
default: return -1;
}
}
Cheers
Juan Pablo Califano
Yes, this is the best way to do it.
Paul
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[Flashcoders] help. mouseEvent doesn´t work o n SWF loaded with JavaScript.
solved !! xml problem... thanks . ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
[Flashcoders] RE: Re: time based smooth animation w/ GTween. HELP! (Jack Doyle)
Hi Jack,
Thank you for the explanations. I've been gradually changing to
TweenLite TweenMax, and so far I'm very happy with it, I've achieved
good results with the filter tween and color matrix. yoyo's really
cool too.
About that other situation, I was trying to have a time-based tween
animation, in order to have a smoother animation . I guess I
misunderstood the renderTime method. I wanted the flash player to
render the tween each 10ms. (cause with a 30fps frame rate, it would
render each 33ms, right? ) just to see what happened... the default
timing mode is frame based, right ?
cheers!
Hey Isaac. What exactly are you trying to accomplish with the
renderTime(10)? Your example tween was only 1 second long, so where does the
10 come from? If you want to skip to a certain time in a TweenMax tween,
make sure you're using the latest v11 (http://blog.greensock.com/v11beta/)
and just set the currentTime property like myTween.currentTime = 10 would
make it go to the 10-second point. Or use the currentProgress property
(always between 0 and 1 where 0.5 is halfway finished) like
myTween.currentProgress = 0.5. Don’t use renderTime() - use the currentTime,
currentProgress, totalTime, or totalProgress getters/setters. The
convenience of these getters/setters is that they can easily be tweened for
advanced effects.
And there's an easier way to accomplish your repeatReverse() functionality.
Just use the yoyo and repeat features like:
var plantaTween:TweenMax = new TweenMax(planta, 1, {y:414, repeat:1,
yoyo:true, ease:Sine.easeInOut});
That'll repeat it once and since yoyo is true, it'll play forward the first
time through and backwards the second time through.
Full ASDoc documentation is at http://www.greensock.com/as/docs/tween/
Again, make sure you've got v11: http://blog.greensock.com/v11beta/. Feel
free to use the forums at http://forums.greensock.com for these types of
questions. I try to be pretty active in responding there.
Jack
PS For the record, TweenLite/Max does NOT use a Timer to drive updates. It's
ENTER_FRAME driven which is generally optimal for many reasons (I won't bore
you with an explanation here). You can have any tween base its timing on
frames instead of time if you prefer (new in v11) by setting useFrames:true.
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