Processing 1.0 - Processing Discourse - Maximum dimensions of ellipse() ?

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Maximum dimensions of ellipse() ? (Read 276 times)

TVS

Maximum dimensions of ellipse() ?
Mar 20^th, 2009, 2:53pm

Rather simple question, but something that wonders me:
is there a maximum dimension for one of the two ellipse() shape variables?

So more exact: in ellipse(0,0,a,b): are a and b limited in dimension?

Or is this error caused due to the dimensions of my window, since the error (see below) only occurs when I zoom in/out or pan my object of rings outside a certain distance of my window....

Reason for this question: I get the following error:

Exception in thread "Animation Thread" java.lang.ArrayIndexOutOfBoundsException: 720
at processing.core.PGraphics3D.ellipseImpl(PGraphics3D.java:2636)
at processing.core.PGraphics.ellipse(PGraphics.java:1517)
at processing.core.PApplet.ellipse(PApplet.java:6952)
at Masonry_Free_Form_Designtool_0319.draw(Masonry_Free_Form_Designtool_0319.java:17
00)
at processing.core.PApplet.handleDraw(PApplet.java:1406)
at processing.core.PApplet.run(PApplet.java:1311)
at java.lang.Thread.run(Thread.java:613)

PhiLho

Re: Maximum dimensions of ellipse() ?
Reply #1 - Mar 20^th, 2009, 3:45pm

What version of Processing do you use
See the list of revisions:
Quote:

PROCESSING 1.0.2 (REV 0164) - 21 February 2009

+ OutOfMemoryError with ellipse() in P3D and OPENGL
http://dev.processing.org/bugs/show_bug.cgi?id=1086

+ ArrayIndexOutOfBoundsException with P3D and OPENGL
http://dev.processing.org/bugs/show_bug.cgi?id=1117

If you have the error with latest version of Processing, I think you should report it in one of these bugs (or create a new, I don't know what fry prefers in this case).

TVS

Re: Maximum dimensions of ellipse() ?
Reply #2 - Mar 20^th, 2009, 3:51pm

Thanks, I indeed didn't download the newest version after 1.01.
My mistake, from now on I will try to watch for newest version better again.

But the quality of the ellipses I get is a lot lower as it was with version 1.01. Is there a new 'function' to adapt the quality, and if so: which? And if not: how come the quality is so much less?

PhiLho

Re: Maximum dimensions of ellipse() ?
Reply #3 - Mar 20^th, 2009, 4:43pm

I fear I can't answer your questions, except perhaps by looking at SVN history of the implementation...

Maybe fry will answer your questions, if he stumbles upon this thread.

I can only guess: perhaps the algorithm is iterative, and the new one does less iterations to avoid exhausting resources, but then have a lesser quality. I don't know OpenGL, but if it doesn't have ellipse primitives, you have to simulate them with polygons having more or less sides. The more side, the better quality, but it needs more memory and slow down processing.

TVS

Re: Maximum dimensions of ellipse() ?
Reply #4 - Mar 21^st, 2009, 2:17pm

Ok, I have found the 'problem':

// returning to pre-1.0 version of algorithm because of problems
int rough = (int)(4+Math.sqrt(w+h)*3);
int accuracy = PApplet.constrain(rough, 6, 100);

So the higher w and h are, the more pieces are used to show the ellipse. The (maybe ugly illegal, but working) solution is:
1. scale
2. use the inverse of this scale in the size of your w and h.

Code:


pushMatrix();
   scale(0.1);
   ellipse(0, 0, (10*w) ,  (10*h)  );
popMatrix();

« Last Edit: Mar 21^st, 2009, 3:31pm by TVS »

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