RE: [Flashcoders] checking combinations
Nice!
And I was determined not to post again, but at a certain stage my mental
block irresistibly kicked in again:
why ingeniously bit-wise encode the combinations just to later decode them
for better readabilty?
Why not drop this altogether as we won't do any encoding:
static var STATE_A:Number = 1; // 1 0
Define the handlers like
handlers = {};// or type it/ make it a class
handlers[STATE_A] = Delegate.create(this,handleAOnly);
// etc.
And finally:
public function handleUpdate(a:Object,b:Object,c:Object,d:Object)
{
state = 'STATE_';
if(a.selected){ state += 'A'};
if(b.selected){ state += 'B'};
// etc.
handlers[state]();
}
What's the benefit of encoding/decoding numbers? Please enlighten me!
Cheers!
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Martin
Wood
Sent: Thursday, January 26, 2006 11:21 AM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
to be more complete how i would actually program it is like this :
import mx.utils.Delegate;
class CombinationHandler
{
// Declare the values used for each state
static var STATE_A:Number = 1; // 1 0
static var STATE_B:Number = 2; // 1 1
static var STATE_C:Number = 4; // 1 2
static var STATE_D:Number = 8; // 1 3
// Either declare the combinations here, or just use
// the STATE_A | STATE_B form in the declare handlers function
static var COMBINATION_AB:Number = STATE_A | STATE_B;
static var COMBINATION_BC:Number = STATE_B | STATE_C;
// array of functions to handle particular states
// and state combinations
private var handlers:Array;
public function CombinationHandler()
{
handlers = new Array();
createHandlers();
}
private function createHandlers()
{
// single case handlers
handlers[STATE_A] = Delegate.create(this,handleAOnly);
handlers[STATE_B] = Delegate.create(this,handleBOnly);
handlers[STATE_C] = Delegate.create(this,handleCOnly);
handlers[STATE_D] = Delegate.create(this,handleDOnly);
// combination handlers
handlers[COMBINATION_AB] = Delegate.create(this,ABhandler);
// OR
// handlers[STATE_A | STATE_B] = ...
}
public function handleUpdate(a:Object,b:Object,c:Object,d:Object)
{
// 'Digitise' the state from the selected flag in a,b,c,d.
var state:Number = (a.selected) | (b.selected 1) |
(c.selected 2) | (d.selected 3);
// call the function
handlers[state]();
}
}
I think this way adding and modifying handlers is easy and safe, youre
not editing code thats surrounded by support code (like case:, else if
etc) so its clear where each response to a particular state is configured.
You can leave the declaration of the combinations out of the static
declarations at the top of the class like i said and just create the
combinations when defining the handler. That way when you add a
combination its just one place to edit, not two, but you may have a case
for using that information again so the static var could be useful. I
dont know :)
btw, in all the places you see | (bitwise OR) you can use + because it
works out the same, im just used to using the bitwise operators for
dealing with bit-based states and state masks. Similary for the shifts
() you can change them for their equivalent multiplication.
thanks,
Martin
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Re: [Flashcoders] checking combinations
one reason, you get type checking when you declare the handlers
handlers[some string] : contents of 'some string' arent checked
handlers[STATE_A | STTE_B] : Compile error : STTE_B is not declared.
the other reasons are habit and familiarity :)
Im used to seeing and working with code for handling states that uses all that
bitwise stuff because of working in other languages where its more common (e.g.
c++). If you feel more comfortable with string based solutions thats all good,
but like i said, the one point where they differ is that the compiler doesnt
check the contents of a string, so a typo can go un-noticed.
thanks,
Martin
Andreas Weber wrote:
Nice!
And I was determined not to post again, but at a certain stage my mental
block irresistibly kicked in again:
why ingeniously bit-wise encode the combinations just to later decode them
for better readabilty?
Why not drop this altogether as we won't do any encoding:
static var STATE_A:Number = 1; // 1 0
Define the handlers like
handlers = {};// or type it/ make it a class
handlers[STATE_A] = Delegate.create(this,handleAOnly);
// etc.
And finally:
public function handleUpdate(a:Object,b:Object,c:Object,d:Object)
{
state = 'STATE_';
if(a.selected){ state += 'A'};
if(b.selected){ state += 'B'};
// etc.
handlers[state]();
}
What's the benefit of encoding/decoding numbers? Please enlighten me!
Cheers!
--
Andreas Weber
motiondraw.com
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Re: [Flashcoders] checking combinations
Or even shorter:
public function handleUpdate(a:Object,b:Object,c:Object,d:Object)
{
var handlerName:String = 'onUpdate';
if (a.selected){handlerName+= 'A'};
if (b.selected){handlerName+='B'};
// etc.
if (this[handlerName]==undefined)
{
trace(We haven't got a handler called:+handlerName);
return;
}
this[handlerName]();
}
public function onUpdateA()
{
// do stuff for A etc.
}
public function onUpdateAB()
{
// do stuff for AB etc.
}
Cheers,
Ian
On 1/26/06, Andreas Weber [EMAIL PROTECTED] wrote:
Nice!
And I was determined not to post again, but at a certain stage my mental
block irresistibly kicked in again:
why ingeniously bit-wise encode the combinations just to later decode them
for better readabilty?
Why not drop this altogether as we won't do any encoding:
static var STATE_A:Number = 1; // 1 0
Define the handlers like
handlers = {};// or type it/ make it a class
handlers[STATE_A] = Delegate.create(this,handleAOnly);
// etc.
And finally:
public function handleUpdate(a:Object,b:Object,c:Object,d:Object)
{
state = 'STATE_';
if(a.selected){ state += 'A'};
if(b.selected){ state += 'B'};
// etc.
handlers[state]();
}
What's the benefit of encoding/decoding numbers? Please enlighten me!
Cheers!
--
Andreas Weber
motiondraw.com
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Re: [Flashcoders] checking combinations
This is indeed a pretty cool thread :)
- edolecki
On 1/26/06, Ian Thomas [EMAIL PROTECTED] wrote:
Or even shorter:
public function handleUpdate(a:Object,b:Object,c:Object,d:Object)
{
var handlerName:String = 'onUpdate';
if (a.selected){handlerName+= 'A'};
if (b.selected){handlerName+='B'};
// etc.
if (this[handlerName]==undefined)
{
trace(We haven't got a handler called:+handlerName);
return;
}
this[handlerName]();
}
public function onUpdateA()
{
// do stuff for A etc.
}
public function onUpdateAB()
{
// do stuff for AB etc.
}
Cheers,
Ian
On 1/26/06, Andreas Weber [EMAIL PROTECTED] wrote:
Nice!
And I was determined not to post again, but at a certain stage my mental
block irresistibly kicked in again:
why ingeniously bit-wise encode the combinations just to later decode
them
for better readabilty?
Why not drop this altogether as we won't do any encoding:
static var STATE_A:Number = 1; // 1 0
Define the handlers like
handlers = {};// or type it/ make it a class
handlers[STATE_A] = Delegate.create(this,handleAOnly);
// etc.
And finally:
public function handleUpdate(a:Object,b:Object,c:Object,d:Object)
{
state = 'STATE_';
if(a.selected){ state += 'A'};
if(b.selected){ state += 'B'};
// etc.
handlers[state]();
}
What's the benefit of encoding/decoding numbers? Please enlighten me!
Cheers!
--
Andreas Weber
motiondraw.com
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RE: [Flashcoders] checking combinations
Sounds like you're trying to do something like this, but even still your
approach seems overly complex. Maybe a more detailed explaination of
what you're trying to do and what combinations are would help.
Meanwhile, if I understand you, would something like this work?
a = false
b = false
c = true
d = true
e = true
f = false
g = true
h = false
i = false
//etc.
myArray = [2,3,6,12,34,54,345,45,76,34]
vars = [a,b,c,d,e,f,g,h,i,j]
counter = 0;
counter_arr = [];
function checkVars(){
for(i=0; imyArray.length; i++){
if(this[vars[i]]){
counter_arr.push(counter+=myArray[i])
trace(vars[i]+ in vars array is true.);
trace(counter is at: +counter);
}
}
}
checkVars();
Jason Merrill | E-Learning Solutions | icfconsulting.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:flashcoders-
[EMAIL PROTECTED] On Behalf Of eric dolecki
Sent: Wednesday, January 25, 2006 1:03 PM
To: Flashcoders mailing list
Subject: [Flashcoders] checking combinations
I have 4 variables I need to check the states of routinely... and
combinations thereof.
I am assuming that if I have a counter, and interogate and += them
values, I
can then check the value of the counter to determine the combinations.
psudeo-code:
var counter:Number = 0;
if ( a ){ counter += 2; }
if ( b ){ counter += 3; }
if ( c ){ counter += 6; }
if ( d ){ counter += 12;}
if ( counter == 2 ){
// only a was true
} else if ( counter == 3 ){
// only b was true
} ...
Which is fine, but thats gonna be one honkin' if else statement to
catch all
the combinations.
Is there a better way of doing this that will catch all the possible
combinations in an elegant way?
- edolecki
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Re: [Flashcoders] checking combinations
i've got to go out now so cant give the full answer i have in my head,
but one way of tackling it is to make each state variable's value a
power of 2
a = 1
b = 2
c = 4
d = 8
then you know that any combination of them has a unique value. (its
basically a 4 bit number)
then to handle the dispatch depending on the state combination you can
build a function table.
functionTable = new Array();
// create a handler for the combination a + b
functionTable[a + b] = Delegate.create(this,combinationAB);
and when you check the variables just call the function directly from
the table :
// a,b,c,d are just passed as boolean flags here
function handleUpdate(a:boolean,b:boolean,c:boolean,d:boolean)
{
// taking advantage of a true being 1 in flash
// and ideally you would setup these numbers
// as static class variables
var state = a + (b * 2) + (c * 4) + (d * 8);
// call the defined function
functionTable[state]();
}
of course you could do a check first to see if the function is defined
and do something like log a warning or whatever is appropriate for your
situation.
hope that makes sense.
martin
eric dolecki wrote:
I have 4 variables I need to check the states of routinely... and
combinations thereof.
I am assuming that if I have a counter, and interogate and += them values, I
can then check the value of the counter to determine the combinations.
psudeo-code:
var counter:Number = 0;
if ( a ){ counter += 2; }
if ( b ){ counter += 3; }
if ( c ){ counter += 6; }
if ( d ){ counter += 12;}
if ( counter == 2 ){
// only a was true
} else if ( counter == 3 ){
// only b was true
} ...
Which is fine, but thats gonna be one honkin' if else statement to catch all
the combinations.
Is there a better way of doing this that will catch all the possible
combinations in an elegant way?
- edolecki
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--
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http://relivethefuture.com/choronzon
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RE: [Flashcoders] checking combinations
You can also use:
combo=0;
if(a){combo+=1000;}
if(b){combo+=100;}
if(c){combo+=10;}
if(d){combo+=1;}
Then convert combo to a string and check the character at each
position ( charAt(0), charAt(1), etc.) for a one or zero, which will
tell you if the associated variable is true or false.
-Marc
At 10:47 AM 1/25/2006, you wrote:
You seem to have something like a 'Round Robin' situation, only more complex
as it is not only about pairs, but also about singles/triplets/quadruplets.
If each of these possible combinations leads to a different action, the
if/else if or switch statement will naturally be very long...
To make it quite a bit more readable and thus managable, maybe you could do
combo = '';
if ( a ){ combo += 'a'; }
if ( b ){ combo += 'b'; }
if ( c ){ combo += 'c'; }
if ( d ){ combo += 'd'; }
switch(combo){
case 'a':
// do stuff
brek;
case 'ab':
// do some other stuff
break;
case 'abc':
//etc.
}
For finding all the 'pairs' see my RoundRobin class below (used to be in the
archives, but can't find it anymore)
hth
--
Andreas Weber
motiondraw.com
class com.motiondraw.util.RoundRobin{
/*
Usage
import com.motiondraw.util.RoundRobin
numPlayers = 12;
// create players
players = new Array();
for(var i=0; inumPlayers; i++){
players[i] = String.fromCharCode(65+i);
}
var rr:RoundRobin = new RoundRobin(players);
rr.displaySchedule();
*/
public var players:Array;
public var schedule:Array;
function RoundRobin(players:Array){
init.apply(this, arguments);
}
function init(players){
this.players = players;
var pc = players.slice(0);
var n = pc.length;
if(n%2){
var odd = true;
pc.push('@');
n++;
}
var nr = n - 1;
var r = new Array();
schedule = new Array();
for (var i=0; inr; i++) {
r[i] = new Array();
r[i][0] = pc[nr];
for (var j=0; jn-1; j++) {
r[i][j+1] = pc[(i+j) % (n-1)];
}
}
for(var i=0, len=r.length; ilen; i++){
schedule[i] = new Array();
for(var j=0; jnr/2; j++){
if(!(odd j==0)){
schedule[i].push([r[i][j],
r[i][nr-j]]);
}
}
}
}
public function displaySchedule(short:Boolean){
var output = new Array();
for(var i=0, len=schedule.length; ilen; i++){
//trace('--- '+(i+1)+'. round ---');
for(var j=0, len2=schedule[i].length; jlen2; j++){
//trace(' '+j+'
'+schedule[i][j][0]+' vs. '+schedule[i][j][1])
output.push(''+schedule[i][j][0]+''+schedule[i][j][1]+'');
}
}
trace(output);
trace(output.length);
}
}
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of eric
dolecki
Sent: Wednesday, January 25, 2006 7:03 PM
To: Flashcoders mailing list
Subject: [Flashcoders] checking combinations
I have 4 variables I need to check the states of routinely... and
combinations thereof.
I am assuming that if I have a counter, and interogate and += them values, I
can then check the value of the counter to determine the combinations.
psudeo-code:
var counter:Number = 0;
if ( a ){ counter += 2; }
if ( b ){ counter += 3; }
if ( c ){ counter += 6; }
if ( d ){ counter += 12;}
if ( counter == 2 ){
// only a was true
} else if ( counter == 3 ){
// only b was true
} ...
Which is fine, but thats gonna be one honkin' if else statement to catch all
the combinations.
Is there a better way of doing this that will catch all the possible
combinations in an elegant way?
- edolecki
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Re: [Flashcoders] checking combinations
Well, lets say you have 4 objects that have selected states fired no
events on their own.
So there are many different possible combinations for the combined states of
those 4 objects. Each possible combination triggers an entirely seperate
action. Thats a lot of actions to account for.
So its all about detecting the unique combinations, and acting upon them.
Perhaps there really is no truly elegant way of doing this...
On 1/25/06, Merrill, Jason [EMAIL PROTECTED] wrote:
Sounds like you're trying to do something like this, but even still your
approach seems overly complex. Maybe a more detailed explaination of
what you're trying to do and what combinations are would help.
Meanwhile, if I understand you, would something like this work?
a = false
b = false
c = true
d = true
e = true
f = false
g = true
h = false
i = false
//etc.
myArray = [2,3,6,12,34,54,345,45,76,34]
vars = [a,b,c,d,e,f,g,h,i,j]
counter = 0;
counter_arr = [];
function checkVars(){
for(i=0; imyArray.length; i++){
if(this[vars[i]]){
counter_arr.push(counter+=myArray[i])
trace(vars[i]+ in vars array is true.);
trace(counter is at: +counter);
}
}
}
checkVars();
Jason Merrill | E-Learning Solutions | icfconsulting.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:flashcoders-
[EMAIL PROTECTED] On Behalf Of eric dolecki
Sent: Wednesday, January 25, 2006 1:03 PM
To: Flashcoders mailing list
Subject: [Flashcoders] checking combinations
I have 4 variables I need to check the states of routinely... and
combinations thereof.
I am assuming that if I have a counter, and interogate and += them
values, I
can then check the value of the counter to determine the combinations.
psudeo-code:
var counter:Number = 0;
if ( a ){ counter += 2; }
if ( b ){ counter += 3; }
if ( c ){ counter += 6; }
if ( d ){ counter += 12;}
if ( counter == 2 ){
// only a was true
} else if ( counter == 3 ){
// only b was true
} ...
Which is fine, but thats gonna be one honkin' if else statement to
catch all
the combinations.
Is there a better way of doing this that will catch all the possible
combinations in an elegant way?
- edolecki
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RE: [Flashcoders] checking combinations
Seems to be an ispiring question/problem!
Eric - if you'd go with the combo - Strings - these are the 16 possible
combinations:
,a,ab,abc,abcd,abd,ac,acd,ad,b,bc,bcd,bd,c,cd,d
(first one is an empty string if a b c d are false)
I'm not overly proud of how I found the combinations, but sometimes nothing
beats brute force :-)
arr = ['a','b','c','d'];
numElems = arr.length;
combos = new Array();
c=0;
while(c10){
combo = '';
for(var i=0; inumElems; i++){
if(Math.random() 0.5){
combo += arr[i];
}
}
inArray = false;
for(var i=0, len=combos.length; ilen; i++){
if(combo == combos[i]){
inArray = true;
break
}
}
if(!inArray){
combos.push(combo);
}
c++;
}
combos.sort();
trace(combos);
trace(combos.length);
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Martin
Wood
Sent: Wednesday, January 25, 2006 8:05 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
i've got to go out now so cant give the full answer i have in my head,
but one way of tackling it is to make each state variable's value a
power of 2
a = 1
b = 2
c = 4
d = 8
then you know that any combination of them has a unique value. (its
basically a 4 bit number)
then to handle the dispatch depending on the state combination you can
build a function table.
functionTable = new Array();
// create a handler for the combination a + b
functionTable[a + b] = Delegate.create(this,combinationAB);
and when you check the variables just call the function directly from
the table :
// a,b,c,d are just passed as boolean flags here
function handleUpdate(a:boolean,b:boolean,c:boolean,d:boolean)
{
// taking advantage of a true being 1 in flash
// and ideally you would setup these numbers
// as static class variables
var state = a + (b * 2) + (c * 4) + (d * 8);
// call the defined function
functionTable[state]();
}
of course you could do a check first to see if the function is defined
and do something like log a warning or whatever is appropriate for your
situation.
hope that makes sense.
martin
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Re: [Flashcoders] checking combinations
I think which each combination being completely unique, i have no other
option than a honkin' switch or if/else. Lots of typing but will work. I can
work on making it more readable, but thats about it methinks.
On 1/25/06, Andreas Weber [EMAIL PROTECTED] wrote:
Seems to be an ispiring question/problem!
Eric - if you'd go with the combo - Strings - these are the 16 possible
combinations:
,a,ab,abc,abcd,abd,ac,acd,ad,b,bc,bcd,bd,c,cd,d
(first one is an empty string if a b c d are false)
I'm not overly proud of how I found the combinations, but sometimes
nothing
beats brute force :-)
arr = ['a','b','c','d'];
numElems = arr.length;
combos = new Array();
c=0;
while(c10){
combo = '';
for(var i=0; inumElems; i++){
if(Math.random() 0.5){
combo += arr[i];
}
}
inArray = false;
for(var i=0, len=combos.length; ilen; i++){
if(combo == combos[i]){
inArray = true;
break
}
}
if(!inArray){
combos.push(combo);
}
c++;
}
combos.sort();
trace(combos);
trace(combos.length);
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Martin
Wood
Sent: Wednesday, January 25, 2006 8:05 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
i've got to go out now so cant give the full answer i have in my head,
but one way of tackling it is to make each state variable's value a
power of 2
a = 1
b = 2
c = 4
d = 8
then you know that any combination of them has a unique value. (its
basically a 4 bit number)
then to handle the dispatch depending on the state combination you can
build a function table.
functionTable = new Array();
// create a handler for the combination a + b
functionTable[a + b] = Delegate.create(this,combinationAB);
and when you check the variables just call the function directly from
the table :
// a,b,c,d are just passed as boolean flags here
function handleUpdate(a:boolean,b:boolean,c:boolean,d:boolean)
{
// taking advantage of a true being 1 in flash
// and ideally you would setup these numbers
// as static class variables
var state = a + (b * 2) + (c * 4) + (d * 8);
// call the defined function
functionTable[state]();
}
of course you could do a check first to see if the function is defined
and do something like log a warning or whatever is appropriate for your
situation.
hope that makes sense.
martin
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RE: [Flashcoders] checking combinations
Aren't there 256 possible combinations? Or if one value can be null,
then 625? What about dab, cab, bac, da, ca, etc? Or are you saying for
the sake simplicity, cab is the same combination as abc and dab the same
as abd?
Jason Merrill | E-Learning Solutions | icfconsulting.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:flashcoders-
[EMAIL PROTECTED] On Behalf Of Andreas Weber
Sent: Wednesday, January 25, 2006 2:21 PM
To: Flashcoders mailing list
Subject: RE: [Flashcoders] checking combinations
Seems to be an ispiring question/problem!
Eric - if you'd go with the combo - Strings - these are the 16
possible
combinations:
,a,ab,abc,abcd,abd,ac,acd,ad,b,bc,bcd,bd,c,cd,d
(first one is an empty string if a b c d are false)
I'm not overly proud of how I found the combinations, but sometimes
nothing
beats brute force :-)
arr = ['a','b','c','d'];
numElems = arr.length;
combos = new Array();
c=0;
while(c10){
combo = '';
for(var i=0; inumElems; i++){
if(Math.random() 0.5){
combo += arr[i];
}
}
inArray = false;
for(var i=0, len=combos.length; ilen; i++){
if(combo == combos[i]){
inArray = true;
break
}
}
if(!inArray){
combos.push(combo);
}
c++;
}
combos.sort();
trace(combos);
trace(combos.length);
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Martin
Wood
Sent: Wednesday, January 25, 2006 8:05 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
i've got to go out now so cant give the full answer i have in my head,
but one way of tackling it is to make each state variable's value a
power of 2
a = 1
b = 2
c = 4
d = 8
then you know that any combination of them has a unique value. (its
basically a 4 bit number)
then to handle the dispatch depending on the state combination you can
build a function table.
functionTable = new Array();
// create a handler for the combination a + b
functionTable[a + b] = Delegate.create(this,combinationAB);
and when you check the variables just call the function directly from
the table :
// a,b,c,d are just passed as boolean flags here
function handleUpdate(a:boolean,b:boolean,c:boolean,d:boolean)
{
// taking advantage of a true being 1 in flash
// and ideally you would setup these numbers
// as static class variables
var state = a + (b * 2) + (c * 4) + (d * 8);
// call the defined function
functionTable[state]();
}
of course you could do a check first to see if the function is defined
and do something like log a warning or whatever is appropriate for
your
situation.
hope that makes sense.
martin
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Re: [Flashcoders] checking combinations
dab, abd, adb, bda, dba, ... all the same combination.
On 1/25/06, Merrill, Jason [EMAIL PROTECTED] wrote:
Aren't there 256 possible combinations? Or if one value can be null,
then 625? What about dab, cab, bac, da, ca, etc? Or are you saying for
the sake simplicity, cab is the same combination as abc and dab the same
as abd?
Jason Merrill | E-Learning Solutions | icfconsulting.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:flashcoders-
[EMAIL PROTECTED] On Behalf Of Andreas Weber
Sent: Wednesday, January 25, 2006 2:21 PM
To: Flashcoders mailing list
Subject: RE: [Flashcoders] checking combinations
Seems to be an ispiring question/problem!
Eric - if you'd go with the combo - Strings - these are the 16
possible
combinations:
,a,ab,abc,abcd,abd,ac,acd,ad,b,bc,bcd,bd,c,cd,d
(first one is an empty string if a b c d are false)
I'm not overly proud of how I found the combinations, but sometimes
nothing
beats brute force :-)
arr = ['a','b','c','d'];
numElems = arr.length;
combos = new Array();
c=0;
while(c10){
combo = '';
for(var i=0; inumElems; i++){
if(Math.random() 0.5){
combo += arr[i];
}
}
inArray = false;
for(var i=0, len=combos.length; ilen; i++){
if(combo == combos[i]){
inArray = true;
break
}
}
if(!inArray){
combos.push(combo);
}
c++;
}
combos.sort();
trace(combos);
trace(combos.length);
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Martin
Wood
Sent: Wednesday, January 25, 2006 8:05 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
i've got to go out now so cant give the full answer i have in my head,
but one way of tackling it is to make each state variable's value a
power of 2
a = 1
b = 2
c = 4
d = 8
then you know that any combination of them has a unique value. (its
basically a 4 bit number)
then to handle the dispatch depending on the state combination you can
build a function table.
functionTable = new Array();
// create a handler for the combination a + b
functionTable[a + b] = Delegate.create(this,combinationAB);
and when you check the variables just call the function directly from
the table :
// a,b,c,d are just passed as boolean flags here
function handleUpdate(a:boolean,b:boolean,c:boolean,d:boolean)
{
// taking advantage of a true being 1 in flash
// and ideally you would setup these numbers
// as static class variables
var state = a + (b * 2) + (c * 4) + (d * 8);
// call the defined function
functionTable[state]();
}
of course you could do a check first to see if the function is defined
and do something like log a warning or whatever is appropriate for
your
situation.
hope that makes sense.
martin
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RE: [Flashcoders] checking combinations
Well, if only 16 possibilities, then just use a switch statement (not an
if-else - too hairy IMO)
Jason Merrill | E-Learning Solutions | icfconsulting.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:flashcoders-
[EMAIL PROTECTED] On Behalf Of eric dolecki
Sent: Wednesday, January 25, 2006 2:50 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
dab, abd, adb, bda, dba, ... all the same combination.
On 1/25/06, Merrill, Jason [EMAIL PROTECTED] wrote:
Aren't there 256 possible combinations? Or if one value can be
null,
then 625? What about dab, cab, bac, da, ca, etc? Or are you saying
for
the sake simplicity, cab is the same combination as abc and dab the
same
as abd?
Jason Merrill | E-Learning Solutions | icfconsulting.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:flashcoders-
[EMAIL PROTECTED] On Behalf Of Andreas Weber
Sent: Wednesday, January 25, 2006 2:21 PM
To: Flashcoders mailing list
Subject: RE: [Flashcoders] checking combinations
Seems to be an ispiring question/problem!
Eric - if you'd go with the combo - Strings - these are the 16
possible
combinations:
,a,ab,abc,abcd,abd,ac,acd,ad,b,bc,bcd,bd,c,cd,d
(first one is an empty string if a b c d are false)
I'm not overly proud of how I found the combinations, but
sometimes
nothing
beats brute force :-)
arr = ['a','b','c','d'];
numElems = arr.length;
combos = new Array();
c=0;
while(c10){
combo = '';
for(var i=0; inumElems; i++){
if(Math.random() 0.5){
combo += arr[i];
}
}
inArray = false;
for(var i=0, len=combos.length; ilen; i++){
if(combo == combos[i]){
inArray = true;
break
}
}
if(!inArray){
combos.push(combo);
}
c++;
}
combos.sort();
trace(combos);
trace(combos.length);
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
Martin
Wood
Sent: Wednesday, January 25, 2006 8:05 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
i've got to go out now so cant give the full answer i have in my
head,
but one way of tackling it is to make each state variable's value
a
power of 2
a = 1
b = 2
c = 4
d = 8
then you know that any combination of them has a unique value.
(its
basically a 4 bit number)
then to handle the dispatch depending on the state combination you
can
build a function table.
functionTable = new Array();
// create a handler for the combination a + b
functionTable[a + b] = Delegate.create(this,combinationAB);
and when you check the variables just call the function directly
from
the table :
// a,b,c,d are just passed as boolean flags here
function handleUpdate(a:boolean,b:boolean,c:boolean,d:boolean)
{
// taking advantage of a true being 1 in flash
// and ideally you would setup these numbers
// as static class variables
var state = a + (b * 2) + (c * 4) + (d * 8);
// call the defined function
functionTable[state]();
}
of course you could do a check first to see if the function is
defined
and do something like log a warning or whatever is appropriate for
your
situation.
hope that makes sense.
martin
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privileged or confidential information. If you have received it in
error,
please notify the sender immediately and delete the original. Any
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Re: [Flashcoders] checking combinations
What about something like this:
var results:Array = [ a, b, c, d, e, f, g, h, i,
j, k, l, m, n, o, p ];
function getResult( value1:Boolean, value2:Boolean, value3:Boolean,
value4:Boolean ):Number
{
var resultIndex:Number = 0;
if( value1 ) resultIndex |= 8;
if( value2 ) resultIndex |= 4;
if( value3 ) resultIndex |= 2;
if( value4 ) resultIndex |= 1;
return results[ resultIndex ];
}
trace( getResult( true, true, false, true) );
/*
Results Table
value1 value2 value3 value4 Results
0 0 0 0
a
0 0 0 1
b
0 0 1 0
c
0 0 1 1
d
0 1 0 0
e
0 1 0 1
f
0 1 1 0
g
0 1 1 1
h
1 0 0 0
i
1 0 0 1
j
1 0 1 0
k
1 0 1 1
l
1 1 0 0
m
1 1 0 1
n
1 1 1 0
o
1 1 1 1
p
*/
On 1/25/06, eric dolecki [EMAIL PROTECTED] wrote:
I have 4 variables I need to check the states of routinely... and
combinations thereof.
--
Daniel Cascais
Tel: +56 (0)2 4589495
Cel: +56 (0)9 9417355
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Re: [Flashcoders] checking combinations
Thats interesting. A bit more involved than what I was doing but it is
indeed interesting.
On 1/25/06, Daniel Cascais [EMAIL PROTECTED] wrote:
What about something like this:
var results:Array = [ a, b, c, d, e, f, g, h, i,
j, k, l, m, n, o, p ];
function getResult( value1:Boolean, value2:Boolean, value3:Boolean,
value4:Boolean ):Number
{
var resultIndex:Number = 0;
if( value1 ) resultIndex |= 8;
if( value2 ) resultIndex |= 4;
if( value3 ) resultIndex |= 2;
if( value4 ) resultIndex |= 1;
return results[ resultIndex ];
}
trace( getResult( true, true, false, true) );
/*
Results Table
value1 value2 value3 value4 Results
0 0 0
0 a
0 0 0
1 b
0 0 1
0 c
0 0 1
1 d
0 1 0
0 e
0 1 0
1 f
0 1 1
0 g
0 1 1
1 h
1 0 0
0 i
1 0 0
1 j
1 0 1
0 k
1 0 1
1 l
1 1 0
0 m
1 1 0
1 n
1 1 1
0 o
1 1 1
1 p
*/
On 1/25/06, eric dolecki [EMAIL PROTECTED] wrote:
I have 4 variables I need to check the states of routinely... and
combinations thereof.
--
Daniel Cascais
Tel: +56 (0)2 4589495
Cel: +56 (0)9 9417355
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Re: [Flashcoders] checking combinations
I guess a switch is a little nicer to look at.
On 1/25/06, Merrill, Jason [EMAIL PROTECTED] wrote:
Well, if only 16 possibilities, then just use a switch statement (not an
if-else - too hairy IMO)
Jason Merrill | E-Learning Solutions | icfconsulting.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:flashcoders-
[EMAIL PROTECTED] On Behalf Of eric dolecki
Sent: Wednesday, January 25, 2006 2:50 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
dab, abd, adb, bda, dba, ... all the same combination.
On 1/25/06, Merrill, Jason [EMAIL PROTECTED] wrote:
Aren't there 256 possible combinations? Or if one value can be
null,
then 625? What about dab, cab, bac, da, ca, etc? Or are you saying
for
the sake simplicity, cab is the same combination as abc and dab the
same
as abd?
Jason Merrill | E-Learning Solutions | icfconsulting.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:flashcoders-
[EMAIL PROTECTED] On Behalf Of Andreas Weber
Sent: Wednesday, January 25, 2006 2:21 PM
To: Flashcoders mailing list
Subject: RE: [Flashcoders] checking combinations
Seems to be an ispiring question/problem!
Eric - if you'd go with the combo - Strings - these are the 16
possible
combinations:
,a,ab,abc,abcd,abd,ac,acd,ad,b,bc,bcd,bd,c,cd,d
(first one is an empty string if a b c d are false)
I'm not overly proud of how I found the combinations, but
sometimes
nothing
beats brute force :-)
arr = ['a','b','c','d'];
numElems = arr.length;
combos = new Array();
c=0;
while(c10){
combo = '';
for(var i=0; inumElems; i++){
if(Math.random() 0.5){
combo += arr[i];
}
}
inArray = false;
for(var i=0, len=combos.length; ilen; i++){
if(combo == combos[i]){
inArray = true;
break
}
}
if(!inArray){
combos.push(combo);
}
c++;
}
combos.sort();
trace(combos);
trace(combos.length);
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of
Martin
Wood
Sent: Wednesday, January 25, 2006 8:05 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
i've got to go out now so cant give the full answer i have in my
head,
but one way of tackling it is to make each state variable's value
a
power of 2
a = 1
b = 2
c = 4
d = 8
then you know that any combination of them has a unique value.
(its
basically a 4 bit number)
then to handle the dispatch depending on the state combination you
can
build a function table.
functionTable = new Array();
// create a handler for the combination a + b
functionTable[a + b] = Delegate.create(this,combinationAB);
and when you check the variables just call the function directly
from
the table :
// a,b,c,d are just passed as boolean flags here
function handleUpdate(a:boolean,b:boolean,c:boolean,d:boolean)
{
// taking advantage of a true being 1 in flash
// and ideally you would setup these numbers
// as static class variables
var state = a + (b * 2) + (c * 4) + (d * 8);
// call the defined function
functionTable[state]();
}
of course you could do a check first to see if the function is
defined
and do something like log a warning or whatever is appropriate for
your
situation.
hope that makes sense.
martin
___
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http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
NOTICE:
This message is for the designated recipient only and may contain
privileged or confidential information. If you have received it in
error,
please notify the sender immediately and delete the original. Any
other use
of this e-mail by you is prohibited.
___
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Re: [Flashcoders] checking combinations
The return type should really be String in this case function getResult( value1:Boolean, value2:Boolean, value3:Boolean, value4:Boolean ):String On 1/25/06, eric dolecki [EMAIL PROTECTED] wrote: Thats interesting. A bit more involved than what I was doing but it is indeed interesting. -- Daniel Cascais Tel: +56 (0)2 4589495 Cel: +56 (0)9 9417355 ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
RE: [Flashcoders] checking combinations
I guess I must be missing something here - I still don't understand the
advantage of 'encoding' the conditions as numbers.
As I see it, there is no way around evaluating 16 conditions. We can
either make this transparent or we can 'elegantly' hide it behind
numbers - which we'll have to comment heavily to 'decode' the meaning of
the numbers and to make the code readable for humans.
It's about reacting to the possible combinations of 4 different events,
right?
Let's say the events are 'Inited','Clicked','Bedazzeled','Dragged'.
We could now just do this:
// When event 'Inited' is dispatched, set the flag Inited to true, etc.
combo = '';
if(events[i]){ combo += 'Inited';}
if(events[i]){ combo += 'Clicked';}
if(events[i]){ combo += 'Bedazzeled';}
if(events[i]){ combo += 'Dragged';}
switch(combo){
case :
//do stuff here
break;
case Bedazzeled:
//do stuff here
break;
case BedazzeledDragged:
//do stuff here
break;
case Clicked:
//do stuff here
break;
case ClickedBedazzeled:
//do stuff here
break;
case ClickedBedazzeledDragged:
//do stuff here
break;
case ClickedDragged:
//do stuff here
break;
case Dragged:
//do stuff here
break;
case Inited:
//do stuff here
break;
case InitedBedazzeled:
//do stuff here
break;
case InitedBedazzeledDragged:
//do stuff here
break;
case InitedClicked:
//do stuff here
break;
case InitedClickedBedazzeled:
//do stuff here
break;
case InitedClickedBedazzeledDragged:
//do stuff here
break;
case InitedClickedDragged:
//do stuff here
break;
case InitedDragged:
//do stuff here
break;
}
//--
-
Imo this is a very readable solution - no comments needed to explain
what the code is doing.
Above code is generated and traced to the Output window with this:
events = ['Inited','Clicked','Bedazzeled','Dragged'];
numElems = events.length;
combos = new Array();
// find the combinations
c=0;
while(cnumElems*numElems){
combo = '';
for(var i=0; inumElems; i++){
if(Math.random() 0.5){
combo += events[i];
}
}
inArray = false;
for(var i=0, len=combos.length; ilen; i++){
if(combo == combos[i]){
inArray = true;
break
}
}
if(!inArray){
combos[c++] = combo;
}
}
combos.sort();
// write the code for copy/paste from the output window
trace(// When event '+ events[0]+' is dispatched, set the flag
+events[0]+ to true, etc.);
trace(combo = '';);
for(var i=0, len=events.length; ilen; i++){
trace(if(events[i]){ combo += '+events[i]+';});
}
trace('\nswitch(combo){');
// write the switch statement
for(var i=0, len=combos.length; ilen; i++){
trace('\n case '+combos[i]+':');
trace(' //do stuff here');
trace(' break;');
}
trace('}');
Just overwrite the 'events' Array to accommodate your needs.
hth
--
Andreas Weber
motiondraw.com
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of eric
dolecki
Sent: Mittwoch, 25. Januar 2006 21:17
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
Thats interesting. A bit more involved than what I was doing but it is
indeed interesting.
On 1/25/06, Daniel Cascais [EMAIL PROTECTED] wrote:
What about something like this:
var results:Array = [ a, b, c, d, e, f, g, h, i,
j, k, l, m, n, o, p ];
function getResult( value1:Boolean, value2:Boolean, value3:Boolean,
value4:Boolean ):Number {
var resultIndex:Number = 0;
if( value1 ) resultIndex |= 8;
if( value2 ) resultIndex |= 4;
if( value3 ) resultIndex |= 2;
if( value4 ) resultIndex |= 1;
return results[ resultIndex ];
}
trace( getResult( true, true, false, true) );
/*
Results Table
value1 value2 value3 value4 Results
0 0 0
0 a
0 0 0
1 b
0 0 1
0 c
0 0 1
1 d
0 1 0
0 e
0 1 0
1 f
0 1 1
0 g
0 1 1
1 h
1 0 0
0 i
1 0 0
1 j
1 0
RE: [Flashcoders] checking combinations
Perhaps I'm missing something, but IMO bitwise switch is best approach here. I'd say, it looks like a classical case for it (like user rights etc :-). So, 1) map abcd to binary number: - all are false, - all are true, 1100 - a,b are true while c,d false. 2) convert to digital: -0, -15, 1100-3 and so on 3) checking is done, use some function to process if needed 4) in case you consider abc, cba and bca as different combinations (which makes sense only if they all are true), I can suggest use a pattern number/string for positions/order: 1234 means abcd, 2341 means bcda. Combining this with 1-2 points for normal order (abcd) will cover all combinations. Hope this can help. -- Best regards, GregoryN http://GOusable.com Flash components development. Usability services. On 1/25/06, eric dolecki [EMAIL PROTECTED] wrote: I have 4 variables I need to check the states of routinely... and combinations thereof. ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
RE: [Flashcoders] checking combinations
What he said :) Without kidding, using the binary type of variable
values and checking what the resulting value is, is the way we do it.
Don't ask me how it works, but it does :) (just to help pointing in the
right direction)
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Martin
Wood
Sent: woensdag 25 januari 2006 20:05
To: Flashcoders mailing list
Subject: Re: [Flashcoders] checking combinations
i've got to go out now so cant give the full answer i have in my head,
but one way of tackling it is to make each state variable's value a
power of 2
a = 1
b = 2
c = 4
d = 8
then you know that any combination of them has a unique value. (its
basically a 4 bit number)
then to handle the dispatch depending on the state combination you can
build a function table.
functionTable = new Array();
// create a handler for the combination a + b functionTable[a + b] =
Delegate.create(this,combinationAB);
and when you check the variables just call the function directly from
the table :
// a,b,c,d are just passed as boolean flags here function
handleUpdate(a:boolean,b:boolean,c:boolean,d:boolean)
{
// taking advantage of a true being 1 in flash
// and ideally you would setup these numbers
// as static class variables
var state = a + (b * 2) + (c * 4) + (d * 8);
// call the defined function
functionTable[state]();
}
of course you could do a check first to see if the function is defined
and do something like log a warning or whatever is appropriate for your
situation.
hope that makes sense.
martin
eric dolecki wrote:
I have 4 variables I need to check the states of routinely... and
combinations thereof.
I am assuming that if I have a counter, and interogate and += them
values, I can then check the value of the counter to determine the
combinations.
psudeo-code:
var counter:Number = 0;
if ( a ){ counter += 2; }
if ( b ){ counter += 3; }
if ( c ){ counter += 6; }
if ( d ){ counter += 12;}
if ( counter == 2 ){
// only a was true
} else if ( counter == 3 ){
// only b was true
} ...
Which is fine, but thats gonna be one honkin' if else statement to
catch all the combinations.
Is there a better way of doing this that will catch all the possible
combinations in an elegant way?
- edolecki
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Martin Wood
http://relivethefuture.com/choronzon
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RE: [Flashcoders] checking combinations
Ok, ok I'm clearly outnumbered here - waving white flag :-) And the approach Daniel demonstraded (similar to what Martin outlined) is indeed very elegant and succint. When the actions to take (depending on which combination 'is the case') are rather complex, requiring several lines of code, imo the immediately readable 'string-based' switch still has its merits in terms of readability/managability, but I won't insist - up to Eric to pick the one that best matches the needs of his project. Cheers! -- Andreas Weber motiondraw.com -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Ben Smeets Sent: Thursday, January 26, 2006 8:19 AM To: Flashcoders mailing list Subject: RE: [Flashcoders] checking combinations What he said :) Without kidding, using the binary type of variable values and checking what the resulting value is, is the way we do it. Don't ask me how it works, but it does :) (just to help pointing in the right direction) ___ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
