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Index › Programming Questions & Help › Syntax Questions › Jittery text animation
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Jittery text animation (Read 713 times)
blackant
Jittery text animation
Jan 26th, 2008, 2:24am  
Hi everyone.  I'm working on my first data visualization project and I've got my first question for the experts.

I've got about 100 circles (ellipses) that I have moving very slowly around the screen.  I've set their x and y positions to move between a distance of random(-0.1, 0.1) per render loop.  The motion is very smooth.  I then added text labels to each circle, centered on the center point of each.  The circles themselves continue to have very fluid movement, but the text jumps quite noticeably in 1 pixel increments.  When I zoom in using a screen loupe tool, I can see this more clearly - the circle moves smoothly, apparently by way of constant edge anti-aliasing adjustments, but the text label stays put until it's time to jump a full pixel.

Is there something I could do differently or is this a limitation I will need to work around?

Thanks in advance,
Jason
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blackant
Re: Jittery text animation
Reply #1 - Feb 1st, 2008, 3:39pm  
Here's a link to a quick sketch showing this problem:

http://concepts.blackantmedia.com/jittery/

I'm using createFont() to load a TTF font file - is there a way to specify more aggressive anti-aliasing or something else to smooth the text movement?

Thanks,
Jason
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fjen
Re: Jittery text animation
Reply #2 - Feb 1st, 2008, 4:07pm  
code?
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blackant
Re: Jittery text animation
Reply #3 - Feb 1st, 2008, 4:23pm  
I updated the sample page with a link to the code.

Thanks,
 Jason
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sofunk
Re: Jittery text animation
Reply #4 - Feb 8th, 2008, 9:32am  
Have you tried OPENGL or P3D?  I looked at your code and used P3D and it worked fine for me.
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blackant
Re: Jittery text animation
Reply #5 - Feb 8th, 2008, 1:39pm  
I hadn't even thought about trying the different renderers.  Thanks for the idea - I will certainly try that.
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