Re: Data-dependent slowdown of NSBezierPath
Re: Data-dependent slowdown of NSBezierPath
- Subject: Re: Data-dependent slowdown of NSBezierPath
- From: Scott Anguish <email@hidden>
- Date: Mon, 20 May 2002 01:45:29 -0400
On Monday, May 20, 2002, at 01:17 AM, Warren Nagourney wrote:
I have noticed a strange thing when using NSBezierPath: there is a
dramatic drawing slowdown when I display "noisy" data.
My application is a simulation of a Fourier Transform Spectrometer
which generates simulated data that depends upon several parameters and
then takes the Fourier transform (to retrieve the original spectrum).
It is extremely fast: with 1000 points of data, I can smoothly change
the various parameters (using sliders) and see the transform smoothly
change in the expected manner.
NSBezierPath bogs down badly when lines cross each other... the
noise might be causing this. It's because it actually has to compute
out the places where the lines write over each other (think about the
situation of using alpha, where the crossing points need to be computed
out)
If you're just using straight forward opaque colors, you might get a
speed increase by drawing the lines separately..
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