Java-Gaming.org    
Featured games (79)
games approved by the League of Dukes
Games in Showcase (475)
Games in Android Showcase (106)
games submitted by our members
Games in WIP (530)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: 1 [2]
  ignore  |  Print  
  minimizing image bit depth and resolution for better performance?  (Read 5119 times)
0 Members and 1 Guest are viewing this topic.
Offline trembovetski

Senior Member




If only I knew what I'm talking about!


« Reply #30 - Posted 2005-09-13 16:58:51 »

I think the problem could be a rounding error somewhere. Up to a point your rotate(angle)...rotate(-angle)
turn the transform on and off, but at some angle the restored transform that's left after rotate(-angle) may
have some tiny amount of rotation left because of rounding error, which means that all the rest of the
rendering will be rendered transformed, even though you don't see it.

So one suggestion would be to instead of rotate/unrotate try savetransform/rotate/restoretransform .

Also, I can't find it, but I believe there was a bug fixed in mustang (jdk6.0) which at least partly addressed
this. Could you please try mustang (http://mustang.dev/java.net)?

Thanks,
  Dmitri
Java2D Team
Offline rickyhaggett

Junior Newbie





« Reply #31 - Posted 2005-09-13 17:29:23 »

This sounds pretty plausible, and it reminded me of the last thing I did in desperation last night before going to bed - I tried casting my double to a float, i.e.

g.rotate((float)angle);
...
g.rotate(-(float)angle);

This seemed to have the effect of changing the angles for which the slow-down occured (so angles which previously were fine now caused problems, and angles which were slow were now fine).

I'll try your suggestion this evening, and check out mustang too..

Cheers,

Ricky
Offline rickyhaggett

Junior Newbie





« Reply #32 - Posted 2005-09-13 21:34:28 »

Marvellous!  That fix works - thanks Dmitri.

I now have:

AffineTransform transform = g.getTransform();
g.translate(x, y);
g.rotate(angle);
...
g.setTransform(transform);

.. and I'm back in the wonderful world of 60fps. I'm guessing this way is also slightly more optimal.

For reference, the values causing the trouble were:

0.41887902047863906 (Math.toRadians(24))
6.073745796940266 (Math.toRadians(348))
1.4311699866353502 (Math.toRadians(82)).

Thanks for the help. I've downloaded Mustang - will check it out soon

Ricky


Pages: 1 [2]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

ctomni231 (33 views)
2014-07-18 06:55:21

Zero Volt (29 views)
2014-07-17 23:47:54

danieldean (24 views)
2014-07-17 23:41:23

MustardPeter (26 views)
2014-07-16 23:30:00

Cero (41 views)
2014-07-16 00:42:17

Riven (43 views)
2014-07-14 18:02:53

OpenGLShaders (31 views)
2014-07-14 16:23:47

Riven (30 views)
2014-07-14 11:51:35

quew8 (29 views)
2014-07-13 13:57:52

SHC (65 views)
2014-07-12 17:50:04
HotSpot Options
by dleskov
2014-07-08 03:59:08

Java and Game Development Tutorials
by SwordsMiner
2014-06-14 00:58:24

Java and Game Development Tutorials
by SwordsMiner
2014-06-14 00:47:22

How do I start Java Game Development?
by ra4king
2014-05-17 11:13:37

HotSpot Options
by Roquen
2014-05-15 09:59:54

HotSpot Options
by Roquen
2014-05-06 15:03:10

Escape Analysis
by Roquen
2014-04-29 22:16:43

Experimental Toys
by Roquen
2014-04-28 13:24:22
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!