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Flash Actionscript Goodies

Heres a few helpful bits or flash actionscript code to help you on your way with developing dynamic flash content.

 

Random Number

There are a few ways to generate a random number in flash it all depends on what you need and how your going to do things, heres some examples:

Generate a random number between 0 and 10


variable = Math.random()*10;

Result: variable = 7.967452

 

Rounding a Random Number


variable = Math.floor(Math.random()*10);

Result: variable = 7

 

Random Number (Between specific numbers 10-20)


variable = Math.floor(Math.random()*(20-10+1))+10;

Result: variable = 15

 

For/While Loops

Loops are useful because they allow you to cycle through variables without having to write mountains of code, heres an example of a simple loop for creating many different numbered variables each with a random number.


for (i=0;i<11;i++) {
var tempvar = "variable"+i;
_level0[tempvar] = Math.floor(Math.random()*30);
}

Remember once you define the letter (i) in the loop, it will display the value it has been given, in this example (i++) means that it will add 1 to (i) each time, (<11) means this loop will stop after (i) hits 10. The Output for the above is as follows:

variable1 = 23
variable2 = 17
variable3 = 3
variable4 = 9
variable5 = 22
variable6 = 12
variable7 = 6
variable8 = 9
variable9 = 10
variable10 = 30

 

Key Listeners

Key Listeners allow you to record the input of keys from the keyboard in flash and allow you to peform actions with keys

First you need to setup your key listener as a function as follows:


KeyListener = new Object();
KeyListener.onKeyDown = function() {
if (Key.getAscii() == 13) { // Code for ENTER key
gotoAndPlay(25);
} else if (Key.getAscii() == 8) { // Code for BACKSPACE key
gotoAndPlay(35);
}
}

 

Then either after the function or on another frame where you want the key listender to start simply add this code:


Key.addListener(KeyListener);

 

Useful Key ASCII/ALT Codes

ENTER

13

BACKSPACE

8

0

48

1

49

2

50

3

51

4

52

5

53

6

54

7

55

8

56

9

57

Comments (6)

Thank You .. Realy helpful tips .. Please can you tell me how to make SUDOKU random ... i know it is large detailes ... thank you again

Posted by: PacimaN on 13/08/2008

Thanks for long winded response, but the aim of this post was to create a bookmark with code people could copy paste into flash as and when they need it, thus saving brina power for creativeness ;)

Posted by: Ben on 24/07/2008

@ UnknownFuty: Anybody who's had basic maths classes and had probability as a unit will know that the rand int functions returns a number between 0 and 1. This is then multiplied by a number to obtain a certain range of numbers. In this case in the loop it's been multiplied by 30 so doing the maths the maximum obtainable result is 30 passing the parameters perfectly. That being completely besides the point, this is a great turorial and I got it bookmarked , thx!

Posted by: Mathew on 24/07/2008

Thx for the tip

Posted by: ranjithkes on 22/07/2008

Thx some good tips i have saved!

Posted by: Freedom47 on 19/07/2008

Since when has 23 been between 0 and 10? Fail.

Posted by: UnknownFury on 19/07/2008

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