Re: [Flashcoders] BitmapData.getPixel() - negative value ?
var n:Number = -16777216 trace(n.toString(16)); Gives me: -100 ? Claus Wahlers wrote: pixel = -16777216 -16777216 is 0xff00 (solid black) Try to trace pixel.toString(16) Cheers, Claus. ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
RE: [Flashcoders] BitmapData.getPixel() - negative value ?
-16777216 is 0xff00 (solid black) I thought solid black was 0xff 16777215 ? Jason Merrill Bank of America Learning Organization Effectiveness - Technology Solutions ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] BitmapData.getPixel() - negative value ?
Number.toString() is a little borked. Meister Skinner explains it here: http://www.gskinner.com/blog/archives/2005/12/source_code_tra.html Cheers, Claus. Jeroen Beckers wrote: var n:Number = -16777216 trace(n.toString(16)); Gives me: -100 ? Claus Wahlers wrote: pixel = -16777216 -16777216 is 0xff00 (solid black) Try to trace pixel.toString(16) Cheers, Claus. ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] BitmapData.getPixel() - negative value ?
Merrill, Jason wrote: -16777216 is 0xff00 (solid black) I thought solid black was 0xff 16777215 That'd be white. 0 is black. The additional 'ff' in the highest byte is the alpha value (returned by getPixel32). -- claus wahlers côdeazur brasil http://codeazur.com.br ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
RE: [Flashcoders] BitmapData.getPixel() - negative value ?
Oooops, you are right, I meant 0x00 Nevertheless, you had said, 0xff00 (solid black) ?? Jason Merrill Bank of America Learning Organization Effectiveness - Technology Solutions -Original Message- From: [EMAIL PROTECTED] [mailto:flashcoders- [EMAIL PROTECTED] On Behalf Of Claus Wahlers Sent: Friday, September 15, 2006 11:09 AM To: Flashcoders mailing list Subject: Re: [Flashcoders] BitmapData.getPixel() - negative value ? Merrill, Jason wrote: -16777216 is 0xff00 (solid black) I thought solid black was 0xff 16777215 That'd be white. 0 is black. The additional 'ff' in the highest byte is the alpha value (returned by getPixel32). -- claus wahlers côdeazur brasil http://codeazur.com.br ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] BitmapData.getPixel() - negative value ?
Oooops, you are right, I meant 0x00 Nevertheless, you had said, 0xff00 (solid black) ?? Yeah. Read the rest of my mail. ;) -16777216 is 0xff00 (solid black) I thought solid black was 0xff 16777215 That'd be white. 0 is black. The additional 'ff' in the highest byte is the alpha value (returned by getPixel32). -- claus wahlers côdeazur brasil http://codeazur.com.br ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] BitmapData.getPixel() - negative value ?
Oooops, you are right, I meant 0x00 Nevertheless, you had said, 0xff00 (solid black) ?? It's because it has the alpha value on it (ARGB) with a opacity of 255 (100% opaque, or 0% transparent). 0x00 (or just 0) *IS* solid black, but if you're painting on a bitmap with an alpha channel, you have to be sure to also set its alpha value or else you'll be painting transparent black pixels. Zeh ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
Re: [Flashcoders] BitmapData.getPixel() - negative value ?
Thank you for the link, I will surely read it! Since I don't need the alpha, I changed getPixel32 to getPixel (oh, sorry for wrong topic-title) and it works fine now. Thanks for all the input :-). (Oh, and I also noticed that I was dividing by 0x0, which is off course '0' and dividing by 0 gives 'Infinity'). Cheers! Claus Wahlers wrote: Number.toString() is a little borked. Meister Skinner explains it here: http://www.gskinner.com/blog/archives/2005/12/source_code_tra.html Cheers, Claus. Jeroen Beckers wrote: var n:Number = -16777216 trace(n.toString(16)); Gives me: -100 ? Claus Wahlers wrote: pixel = -16777216 -16777216 is 0xff00 (solid black) Try to trace pixel.toString(16) Cheers, Claus. ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
RE: [Flashcoders] BitmapData.getPixel() - negative value ?
Sorry - :) Jason Merrill Bank of America Learning Organization Effectiveness - Technology Solutions -Original Message- From: [EMAIL PROTECTED] [mailto:flashcoders- [EMAIL PROTECTED] On Behalf Of Claus Wahlers Sent: Friday, September 15, 2006 11:37 AM To: Flashcoders mailing list Subject: Re: [Flashcoders] BitmapData.getPixel() - negative value ? Oooops, you are right, I meant 0x00 Nevertheless, you had said, 0xff00 (solid black) ?? Yeah. Read the rest of my mail. ;) -16777216 is 0xff00 (solid black) I thought solid black was 0xff 16777215 That'd be white. 0 is black. The additional 'ff' in the highest byte is the alpha value (returned by getPixel32). -- claus wahlers côdeazur brasil http://codeazur.com.br ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
RE: [Flashcoders] BitmapData.getPixel() - negative value ?
Good to know, thanks - I can see now I still have a lot to learn about color and the new BitmapData class. :) Jason Merrill Bank of America Learning Organization Effectiveness - Technology Solutions -Original Message- From: [EMAIL PROTECTED] [mailto:flashcoders- [EMAIL PROTECTED] On Behalf Of Zeh Fernando Sent: Friday, September 15, 2006 11:42 AM To: Flashcoders mailing list Subject: Re: [Flashcoders] BitmapData.getPixel() - negative value ? Oooops, you are right, I meant 0x00 Nevertheless, you had said, 0xff00 (solid black) ?? It's because it has the alpha value on it (ARGB) with a opacity of 255 (100% opaque, or 0% transparent). 0x00 (or just 0) *IS* solid black, but if you're painting on a bitmap with an alpha channel, you have to be sure to also set its alpha value or else you'll be painting transparent black pixels. Zeh ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
[Flashcoders] BitmapData.getPixel() - negative value ?
Hi list!
I was trying to create a little class that generates a 2d grid from a
perlinNoise-bitmap image. Now, when I perform the getPixel32(), it
returns a negative value. I did some research and it appears you can get
'-1' when the indexes are out of bounds, but that's as negative as it
goes... And I am getting results as:
pixel = -16777216
pixel = -16119286
pixel = -15724528
pixel = -15658735
Here is my (relevant) code:
private function createBitmap():Void
{
bmd = new BitmapData(this.width, this.height);
bmd.perlinNoise(this.width, this.height, 6, 1, false, false, 1,
true);
_root.holder.attachBitmap(bmd, 1);
createGrid();
}
private function createGrid():Void
{
grid = new Array();
for(var y:Number = 0; ythis.height; y++)
{
grid[y] = new Array();
for(var x:Number = 0; xthis.width; x++)
{
//create a new point
var myPoint:Point3D = grid[y][x] = new Point3D();
//x and z depend on position (orientate around center
(0,0,0))
var xp:Number = x;
var zp:Number = y;
//y depends on the the greyscale value in percentage,
going from 'min' to 'max'
var pixel:Number = bmd.getPixel32(x, y);
trace(pixel = +pixel);
trace();
var percentage:Number = pixel / 0x00;
var yp:Number = percentage * (max - min) + min;
myPoint.setPosition(xp, yp, zp);
}
}
}
The trace(pixel=...); traces a negative value, which I find very
strange... Any suggestions ?
Greets,
Jeroen Beckers
[EMAIL PROTECTED]
http://www.dauntless.be
___
Flashcoders@chattyfig.figleaf.com
To change your subscription options or search the archive:
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
Brought to you by Fig Leaf Software
Premier Authorized Adobe Consulting and Training
http://www.figleaf.com
http://training.figleaf.com
Re: [Flashcoders] BitmapData.getPixel() - negative value ?
pixel = -16777216 -16777216 is 0xff00 (solid black) Try to trace pixel.toString(16) Cheers, Claus. ___ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
