Bitwise Operators
Bitwise operators are a very low level way to program and therefore not considered light reading, but lately I’ve been seeing enough interesting scenarios where they can be applied.
Since the basis for bitwise operators is to manipulate binary data, this is most suited for checking for 1 or 0.
Check to see if a number is odd ( 1 ) or even ( 0 ):
Use as a fast way to divide and floor:
get/set flags:
BITWISE OPERATOR LINKS
- Using Bitwise Operators to Manipulate Bits and Colors - Grant Skinner
- Using bitwise operators in actionscript - Moock
- Get a Speed Boost from the Bitwise Operator
- Bitwise operators - Adobe
- What are Bitwise operators and how/why do you use them?
- Finding Odd/Even Values efficiently - Createage
BINARY LINKS
- 1001010001010001010001010001 - Createage
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jgraup said,
March 3, 2007 @ 6:23 pm
http://pixeldepth.net/index.php?action=tutorials&category=1&id=1156254799
jgraup said,
March 3, 2007 @ 6:25 pm
http://vijayram.wordpress.com/2007/01/30/actionscript-code-tricks-3/
jgraup said,
March 14, 2007 @ 8:00 pm
Bitwise Color Creation
http://www.flash-creations.com/notes/asclass_color.php
example:
// three decimal numbers, one each for R-G-B
var nRed:Number = 101;
var nGreen:Number = 153;
var nBlue:Number = 204;
cCircle.setRGB(nRed< <16 | nGreen<<8 | nBlue);
see also
http://www.flash-creations.com/notes/actionscript_operators.php
jgraup said,
March 14, 2007 @ 8:14 pm
Simple way to get a gray color:
function getRandomGrayscaleColor ( ) :Number
{
var brightness = Math.round (Math.random() * 255 );
return getGrayscaleColor ( brightness );
}
function getGrayscaleColor ( brightness:Number )
{
return ( brightness <<16 | brightness <<8 | brightness )
}
for ( var i = 0; i < 100; i ++ )
{
// new ball
var ball = this.attachMovie( ‘ball’, ‘ball_’ + i, this.getNextHighestDepth() );
ball._x = Stage.width * Math.random();
ball._y = Stage.width * Math.random();
// set color
var colorObj:Color = new Color ( ball );
colorObj.setRGB ( getRandomGrayscaleColor ( ) );
}
jgraup said,
March 16, 2007 @ 6:07 pm
Bitwise XOR
Bytes that differ are 1, bytes that are the same are 0. Converted to 32-bit binary integers before the operation occurs and the fractional portion of an operand, if any, is discarded.
1 = 0
0 = 1
trace ( 1^1 ) // 0
trace ( 0^1 ) // 1
jgraup said,
March 16, 2007 @ 6:18 pm
One way to blindly toggle between a primary and secondary clip within an array.
var nINX = ( clips [ 0 ].isPrimary ) ? 1 : 0;
var oINX = ( nINX ^ 1 );
var primaryClip = clips[ oINX ];
var secondaryClip = clips[ nINX ];
secondaryClip.isPrimary = !( primaryClip.isPrimary = true )
jgraup said,
April 15, 2007 @ 4:40 pm
var a = false
trace( a ) // false
trace( a |= 0 ) // 0
trace( a |= true ) // 1
trace( a |= 99 ) // 99
trace( a |= true ) // 99
trace( a |= 0 ) // 99
jgraup said,
June 1, 2007 @ 1:19 am
http://lab.polygonal.de/2007/05/10/bitwise-gems-fast-integer-math/