Level of Details QwtData Technique?

[baray98]

I am planning to increase my plot performance by playing around with the "level of details" with my subclassed QwtData.

This might not be a Qwt related, but I am just wondering if anybody know about a technique of detail fitering without loosing good information?

example:

If i have 3 millions worth of points in a curve and i decided to show a point on every 100 points. Which of the 100 points that i filtered should i show? Should I show 3 points instead one for min,max and average.

Any insights guys?

baray98

[Uwe]

Maybe Douglas Peucker ?

In Qwt trunk you can find an implementation ( QwtWeedingCurveFitter ) that should work with Qwt 5.2 as well.

Uwe