At 11:31 14/07/2004 +0930, Monte Goulding wrote:
Just out of interest have you tried using a single polygon graphic with markers and no line and just setting the points. That should be very fast.
Nope - had no idea until 5 minutes ago that that might be possible. Thanks to Richard and Dar, I am trying it now ....
btw My earlier reply to Dar was wrong; it's NOT necessary to duplicate each point to get a visible (though zero-length) line drawn - it's enough to simply put each vertex where a shape is wanted, with blank lines (in the point list) in between.
Doing this (and always keeping a base polygon in existence, so it can be modified and never drawn from scratch) makes it much more palatable - 70x70 draw time is down from 700 to about 95 ticks. Still a perceptible delay - but one that I'd feel comfortable saying "just live with it".
(I'm porting this app from a different scripting language,. where the draw times are sub-second up to 5000 data points - so there's a limit to what I can expect people to adjust to).
Someone pointed out earlier that these polygon schemes limit me to a single colour. That is indeed the very opposite of what I need - the visualization I want is done by colours. However, I'll have typically a small number (~4), and rarely more than 10-15 different colours. So it won't be as fast as a single polygon - but it should be within the acceptable range.
I'll do a proper write-up of the schemes and times tomorrow (it's almost 4am here :-) for the sake of the archives.
Thanks again for all the help. -- Alex.
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