Comments on: Fast Line Drawing http://jacksondunstan.com/articles/506 Mastering AS3 Wed, 08 Sep 2010 19:02:09 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: jackson http://jacksondunstan.com/articles/506/comment-page-1#comment-777 jackson Fri, 13 Aug 2010 05:44:03 +0000 http://jacksondunstan.com/?p=506#comment-777 It's not my line-drawing algorithm, but what would I copy/draw from? It’s not my line-drawing algorithm, but what would I copy/draw from?

]]> By: limeyd http://jacksondunstan.com/articles/506/comment-page-1#comment-776 limeyd Fri, 13 Aug 2010 03:02:10 +0000 http://jacksondunstan.com/?p=506#comment-776 Awesome tip, why not swap out the setPixels for copypixels or draw, not as good as photoshop but still rocking Awesome tip, why not swap out the setPixels for copypixels or draw, not as good as photoshop but still rocking

]]> By: jackson http://jacksondunstan.com/articles/506/comment-page-1#comment-567 jackson Sat, 13 Mar 2010 02:26:28 +0000 http://jacksondunstan.com/?p=506#comment-567 On a 2.0 Ghz Intel Core 2 Duo, 2 GB RAM, Mac OS X 10.6: <table> <tr> <th>Dest Point</th> <th>efla</th> <th>lineTo (low)</th> <th>lineTo (medium)</th> <th>lineTo (high)</th> <th>lineTo (best)</th> </tr> <tr> <td>999,999</td> <td>99</td> <td>1 vector/97 bitmap</td> <td>1 vector/407 bitmap</td> <td>1 vector/2095 bitmap</td> <td>1 vector/4703 bitmap</td> </tr> <tr> <td>100,100</td> <td>10</td> <td>1 vector/14 bitmap</td> <td>1 vector/50 bitmap</td> <td>1 vector/216 bitmap</td> <td>1 vector/481 bitmap</td> </tr> <tr> <td>10,10</td> <td>1</td> <td>1 vector/6 bitmap</td> <td>1 vector/14 bitmap</td> <td>1 vector/38 bitmap</td> <td>1 vector/71 bitmap</td> </tr> </table> So yes, it does seem as though there is a fair amount of overhead. It seems safe to say that if you want to draw a lot of little lines and can live with the reduced feature set (eg. solid colors), you'll get a very large (6x minimum) speedup by using a <tt>BitmapData</tt>-based algorithm. Thanks for the tip! On a 2.0 Ghz Intel Core 2 Duo, 2 GB RAM, Mac OS X 10.6:

Dest Point efla lineTo (low) lineTo (medium) lineTo (high) lineTo (best)
999,999 99 1 vector/97 bitmap 1 vector/407 bitmap 1 vector/2095 bitmap 1 vector/4703 bitmap
100,100 10 1 vector/14 bitmap 1 vector/50 bitmap 1 vector/216 bitmap 1 vector/481 bitmap
10,10 1 1 vector/6 bitmap 1 vector/14 bitmap 1 vector/38 bitmap 1 vector/71 bitmap

So yes, it does seem as though there is a fair amount of overhead. It seems safe to say that if you want to draw a lot of little lines and can live with the reduced feature set (eg. solid colors), you’ll get a very large (6x minimum) speedup by using a BitmapData-based algorithm.

Thanks for the tip!

]]> By: benji http://jacksondunstan.com/articles/506/comment-page-1#comment-566 benji Fri, 12 Mar 2010 12:55:52 +0000 http://jacksondunstan.com/?p=506#comment-566 not sure if its relevant, but if i remember rightly the graphics methods are not affected much by the distance of the line drawn..where as any bitmap method would gain a performance boost for shorter differences.. do a find and replace for "999" and change it to "100" you should here really see the benifits ;) not sure if its relevant, but if i remember rightly the graphics methods are not affected much by the distance of the line drawn..where as any bitmap method would gain a performance boost for shorter differences..

do a find and replace for “999″ and change it to “100″

you should here really see the benifits ;)

]]> By: Sony VSPNS7 – Digital signage player | Office Signage http://jacksondunstan.com/articles/506/comment-page-1#comment-453 Sony VSPNS7 – Digital signage player | Office Signage Wed, 16 Dec 2009 21:42:16 +0000 http://jacksondunstan.com/?p=506#comment-453 [...] Fast Line Drawing « JacksonDunstan.com [...] [...] Fast Line Drawing « JacksonDunstan.com [...]

]]> By: simppa http://jacksondunstan.com/articles/506/comment-page-1#comment-430 simppa Sat, 05 Dec 2009 07:41:38 +0000 http://jacksondunstan.com/?p=506#comment-430 Ah, ok. Better this way. Ah, ok. Better this way.

]]> By: jackson http://jacksondunstan.com/articles/506/comment-page-1#comment-429 jackson Fri, 04 Dec 2009 18:01:51 +0000 http://jacksondunstan.com/?p=506#comment-429 <a href="http://help.adobe.com/en_US/AS3LCR/Flash_10.0/flash/display/BitmapData.html#lock()" rel="nofollow">Locking</a> the <tt>BitmapData</tt> only means that <tt>Bitmap</tt> objects using it will not be updated. In my test I am not using any <tt>Bitmap</tt> objects so the lock is an unnecessary slowdown. I actually get 70-71 milliseconds instead of 64 milliseconds on the same test machine if I include a <tt>lock</tt>/<tt>unlock</tt> pair in the test. Locking the BitmapData only means that Bitmap objects using it will not be updated. In my test I am not using any Bitmap objects so the lock is an unnecessary slowdown. I actually get 70-71 milliseconds instead of 64 milliseconds on the same test machine if I include a lock/unlock pair in the test.

]]> By: simppa http://jacksondunstan.com/articles/506/comment-page-1#comment-420 simppa Fri, 04 Dec 2009 11:41:43 +0000 http://jacksondunstan.com/?p=506#comment-420 It's beatable. You should always lock and unlock bitmapData when drawing on it. That will increase the gap between performance results of these line draw methods :) Thanks for noticing the algo. It’s beatable. You should always lock and unlock bitmapData when drawing on it. That will increase the gap between performance results of these line draw methods :)

Thanks for noticing the algo.

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