Difference between revisions of "Actionscript"

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−
actionscript, that infuriatingly intractable marshmellow fluff...
+
http://ntt.cc/2008/04/09/over-30-useful-as3-open-source-projects.html
−
so far i have only understood the most basic of concepts, but now i will try to learn it well.
 
  
−
*[[Actionscript Sandbox]]
+
== Basics ==
 +
=== Operators ===
  
−
== tips ==
+
* + for addition
 +
* - for subtraction
 +
* asterisk for multiply
 +
* / for divide
 +
 
 +
these two are the same:
 +
<pre>myNum = myNum + 6;
 +
myNum += 6;</pre>
 +
 
 +
* ++ add one
 +
* -- decrease by one
 +
 
 +
those can be postfix or prefix operators but remember that only prefix affects it immediately.
 +
<pre>myNum = 5;
 +
trace(myNum++);      // displays 5 (adds one to next trace)
 +
trace(myNum);      // displays 6 (has added one from the postfix)
 +
trace(++myNum);      // displays 7 (adds one as its a prefix)
 +
</pre>
 +
 
 +
use this incremental thing to modify property over time:
 +
<pre>my_mc.onEnterFrame = function () {
 +
this._rotation += 5;      // makes mc rotate by 5 degrees clockwise for each tick of frame rate
 +
};</pre>
 +
 
 +
=== Checking/Comparing Values ===
 +
 
 +
* == checks for logical equality
 +
*  != checks for logical inequality
 +
* === checks for strict logical equality
 +
* !== checks for strict logical inequality
 +
 
 +
<pre>logical equality test
 +
trace(5 == 6);      // false             
 +
trace(6 == 6);      // true
 +
trace(6 == "6");      // true
 +
 
 +
logical inequality test
 +
trace(5 != 6);      // true             
 +
trace(6 != 6);      // false             
 +
trace(6 != "6");      // false</pre>
 +
 
 +
notice how with or without the quotation marks its okay... but with the strict logical operators, its not the case.
 +
 
 +
<pre>strict logical equality test
 +
trace(5 === 6);      // false             
 +
trace(6 === 6);      // true
 +
trace(6 === "6");      // false
 +
trace("6" === 6);      // false
 +
trace("6" === "6");      // true
 +
 
 +
strict logical inequality test
 +
trace(5 !== 6);      // true             
 +
trace(6 !== 6);      // false             
 +
trace(6 !== "6");      // true
 +
trace("6" !== 6);      // true
 +
trace("6" !== "6");      // false</pre>
 +
 
 +
you have to remember that you shouldn't use just one = to test if its equal as the single = assigns values to things.
 +
 
 +
=== Checking Datatype ===
 +
 
 +
<pre>var myVar = 5;
 +
if (typeof myVar == "number") {
 +
  trace("Its a number");
 +
}</pre>
 +
 
 +
NaN is when its Not a Number but you can't just check it against the NaN. You have to use the special isNaN function (conversely, you can also use !isNaN to find a number)
 +
 
 +
<pre>var myVar - 15 - "coffee";
 +
if (isNaN(myVar)) {
 +
trace("Thats not a number");
 +
}</pre>
 +
 
 +
=== Comparing Arrays ===
 +
 
 +
when arrays are compared to see if they are the same, it has to be the exact same thing ie: can't just contain the same items, it has to be equalled, like literally...
 +
 
 +
<pre>arrayOne = newArray("wonk", "wink");
 +
arrayTwo = newArray("wonk", "wink");
 +
trace(arrayOne == arrayTwo); // displays false
 +
 
 +
arrayOne = newArray("wonk", "wink");
 +
arrayOne = arrayTwo;
 +
trace(arrayOne == arrayTwo); // displays true</pre>
 +
 
 +
=== Conditionals ===
 +
 
 +
<pre>var message = "yellow";                        // the equal sign assigns values to variables
 +
trace ("big " + message + " truck");            // prints "big yellow truck"
 +
if (message == "yellow") {                      // the double equal sign checks to see if variables are equal
 +
trace ("yes, i did say big yellow truck.");    // prints "yes, i did say big yellow truck"
 +
trace (typeof message);                        // prints "string"
 +
var x = a;                                      // prints "number"
 +
trace (typeof a)
 +
}</pre>
 +
 
 +
<pre>var x = 1;
 +
while (x <= 5) {                // as long as x is less than 5...
 +
trace (x);                      // return 1 in output
 +
x = x + 1;                      // return 2 3 4 5 in output
 +
}</pre>
 +
 
 +
=== Reusable functions===
 +
 
 +
== Runtime Environment ==
 +
=== Include external actionscript file===
 +
<pre>#include "filename.as"          // includes the .as file at runtime (must be in same folder as .fla)</pre>
 +
 
 +
=== Detecting player/OS ===
 +
=== Setting movie dimensions ===
 +
 
 +
== Color ==
 +
=== Setting RGB ===
 +
=== Setting Transparency ===
 +
=== Transform and restore RGB ===
 +
=== Controlling RGB with sliders ===
 +
 
 +
== Drawing ==
 +
 
 +
== Numbers ==
 +
=== Rounding Numbers ===
 +
 
 +
== Text Field ==
 +
 
 +
== Arrays ==
 +
Oh no.
 +
 
 +
== Strings ==
 +
 
 +
== Date/Time ==
  
−
* use frame labels rather than frame numbers. you could call a starting frame "init".
 
−
* dont use too many functions
 
  
 
== See Also ==
 
== See Also ==
−
*[http://livedocs.adobe.com/flashlite/2/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00000642.html preloader]
+
 
−
*[http://www.sephiroth.it/python/sepy.php SEPY actionscript editor]
+
[[Category:Programming]]
−
*[http://www.mtasc.org/ Motion-Twin ActionScript 2 Open Source free compiler.]
 

Latest revision as of 03:39, 1 June 2009

http://ntt.cc/2008/04/09/over-30-useful-as3-open-source-projects.html

Basics

Operators

  • + for addition
  • - for subtraction
  • asterisk for multiply
  • / for divide

these two are the same: 

myNum = myNum + 6;
myNum += 6;
  • ++ add one
  • -- decrease by one

those can be postfix or prefix operators but remember that only prefix affects it immediately. 

myNum = 5;
trace(myNum++);       // displays 5 (adds one to next trace)
trace(myNum);       // displays 6 (has added one from the postfix)
trace(++myNum);       // displays 7 (adds one as its a prefix)

use this incremental thing to modify property over time: 

my_mc.onEnterFrame = function () {
this._rotation += 5;       // makes mc rotate by 5 degrees clockwise for each tick of frame rate
};

Checking/Comparing Values

  • == checks for logical equality
  •  != checks for logical inequality
  • === checks for strict logical equality
  •  !== checks for strict logical inequality
logical equality test 
trace(5 == 6);       // false               
trace(6 == 6);       // true
trace(6 == "6");       // true

logical inequality test
trace(5 != 6);       // true               
trace(6 != 6);       // false               
trace(6 != "6");       // false

notice how with or without the quotation marks its okay... but with the strict logical operators, its not the case. 

strict logical equality test 
trace(5 === 6);       // false               
trace(6 === 6);       // true
trace(6 === "6");       // false
trace("6" === 6);       // false
trace("6" === "6");       // true

strict logical inequality test
trace(5 !== 6);       // true               
trace(6 !== 6);       // false               
trace(6 !== "6");       // true
trace("6" !== 6);       // true
trace("6" !== "6");       // false

you have to remember that you shouldn't use just one = to test if its equal as the single = assigns values to things.

Checking Datatype

var myVar = 5;
if (typeof myVar == "number") {
  trace("Its a number");
}

NaN is when its Not a Number but you can't just check it against the NaN. You have to use the special isNaN function (conversely, you can also use !isNaN to find a number) 

var myVar - 15 - "coffee";
if (isNaN(myVar)) {
trace("Thats not a number");
}

Comparing Arrays

when arrays are compared to see if they are the same, it has to be the exact same thing ie: can't just contain the same items, it has to be equalled, like literally... 

arrayOne = newArray("wonk", "wink");
arrayTwo = newArray("wonk", "wink");
trace(arrayOne == arrayTwo);		// displays false

arrayOne = newArray("wonk", "wink");
arrayOne = arrayTwo;
trace(arrayOne == arrayTwo);		// displays true

Conditionals

var message = "yellow";                         // the equal sign assigns values to variables
trace ("big " + message + " truck");            // prints "big yellow truck"
if (message == "yellow") {                      // the double equal sign checks to see if variables are equal
trace ("yes, i did say big yellow truck.");     // prints "yes, i did say big yellow truck"
trace (typeof message);                         // prints "string"
var x = a;                                      // prints "number"
trace (typeof a)
}
var x = 1;
while (x <= 5) {                // as long as x is less than 5...
trace (x);                      // return 1 in output
x = x + 1;                      // return 2 3 4 5 in output
}

Reusable functions

Runtime Environment

Include external actionscript file

#include "filename.as"          // includes the .as file at runtime (must be in same folder as .fla)

Detecting player/OS

Setting movie dimensions

Color

Setting RGB

Setting Transparency

Transform and restore RGB

Controlling RGB with sliders

Drawing

Numbers

Rounding Numbers

Text Field

Arrays

Oh no.

Strings

Date/Time

See Also

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