Here is a snippet of the source, any thoughts on how this can be simplified?
...
function getDistortedRect(rect:Rectangle, d:DisplacementMapFilter):Array
{
var resultArr:Array = new Array();
resultArr.push( getDistortedPoint(rect.topLeft, d));
resultArr.push( getDistortedPoint(new Point(rect.x + rect.width,
rect.y), d));
resultArr.push( getDistortedPoint(rect.bottomRight, d));
resultArr.push( getDistortedPoint(new Point(rect.x, rect.y +
rect.height), d));
return (resultArr);
}
function getDistortedPoint(o:Point, d:DisplacementMapFilter):Point
{
var hex = (d.mapBitmap.getPixel(o.x, o.y).toString(16));
//1 (red), 2 (green), 4 (blue)
switch(d.componentX)
{
case 1:
var xChannel = HexToR(hex);
break;
case 2:
var xChannel = HexToG(hex);
break;
case 4:
var xChannel = HexToB(hex);
break;
default:
break;
}
switch(d.componentY)
{
case 1:
var yChannel = HexToR(hex);
break;
case 2:
var yChannel = HexToG(hex);
break;
case 4:
var yChannel = HexToB(hex);
break;
default:
break;
}
var destinationX:Number = o.x - ((xChannel-128) * d.scaleX)/256;
var destinationY:Number = o.y - ((yChannel-128) * d.scaleY)/256;
return (new Point(destinationX, destinationY));
}
//hex conversion helpers
function HexToR(h) {return parseInt(h.substring(0,2),16)}
function HexToG(h) {return parseInt(h.substring(2,4),16)}
function HexToB(h) {return parseInt(h.substring(4,6),16)}
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Howard Nager
Sent: Sun 12/18/2005 1:17 PM
To: Flashcoders mailing list; Flashcoders mailing list
Subject: RE: [Flashcoders] Displacement Maps, and Button actions
Thanks for the tip - the formula looks like:
dstPixel[x, y] = srcPixel[x + ((componentX(x, y) - 128) * scaleX) / 256, y +
((componentY(x, y) - 128) * scaleY) / 256]
I am assuming that (componentX(x, y) should have a result from 0-255. So to get
this I am grabbing the value at a given pixel in the displacementmap bitmap
(getPixel), converting that value to rgb, then grabbing the the correct
channel's value (defined as componentX when I set up the filter) using a
conversion function:
function HexToR(h) {return parseInt(h.substring(0,2),16)}
function HexToG(h) {return parseInt(h.substring(2,4),16)}
function HexToB(h) {return parseInt(h.substring(4,6),16)}
I repeat the same for y then calculate out the rest of the function.
I must be doing something wrong in this process because the displacement I am
calculating isn't visually matching up. Is there a different way that I should
be grabbing the channel value?
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Alan MacDougall
Sent: Sat 12/17/2005 11:08 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] Displacement Maps, and Button actions
Howard Nager wrote:
>Thanks - the buttons are rectangular - any tips on how to calculate the corner
>positions if the displacement map is a gradient distorting on both x and y?
>
>
>
I don't know the math behind the displacement map (I glanced at the
formula and decided not to figure it out unless I had to!) If you do a
little trial and error until you can get a single point to match, you
should be able to calculate exactly how each gray value translates each
point. The documentation for the DisplacementMapFilter object does list
the formula, which should be a good starting point.
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