Re: Scrolling Text Algorithm for a Screen Saver
Re: Scrolling Text Algorithm for a Screen Saver
- Subject: Re: Scrolling Text Algorithm for a Screen Saver
- From: Stephane <email@hidden>
- Date: Mon, 30 Oct 2006 18:31:38 +0100
On Oct 30, 2006, at 6:14 PM, Mike Abdullah wrote:
If you want to support just 10.4, this seems like a perfect
opportunity to use Quartz Composer to me.
Mike.
On 30 Oct 2006, at 09:34, Doug Fort wrote:
Hi,
I'm working on a screen saver. It involves scrolling text across the
screen. I'm using the simplest algorithm I could think of: calls to
NSString drawAtPoint:withAttributes: with the point moving a fixed
offset at each call to animateOneFrame. This works Ok at low
scrolling
speeds, but at higher speeds (i.e. a larger offset), the motion
appears jerky.
I'm working on improving my code to minimize the amount of
computation
in animateOneFrame. However, if anyone can suggest a better algorithm
for scrolling text, I'd appreciate it.
Text drawing with NSString is a nightmare from:
- a performance point of view
- a buggy point of view (there are bugs in the API which prevents
drawing the strings in some cases (borders for instance)).
when it comes to screen savers.
It may be a good idea to go with a OpenGL solution such as FreeType.
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