Best graphing package for java?

[Nicros]

We are currently using JFreeChart to do some drawing of graphs and are
finding it to be extremely slow with large datasets. For example, we
need to draw and redraw 16000 x,y datapoints allowing zoom, scrolling,
the usual stuff.

We used to do this in C++ using PEGraph and it is super fast, with no
discernable redraw time but JFreeCharts is quite slow (up to 1 second,
which for our users is a lot).

Are there better java packages available for this kind of thing? Can
anyone point me to them? It does not need to be free, we will pay for
the best one.

Thanks!

 

[Stefan Ram]

We used to do this in C++ using PEGraph and it is super fast,
with no discernable redraw time but JFreeCharts is quite slow
(up to 1 second, which for our users is a lot).

Runtime might be determined by branch prediction and
memory locality of code and data.

If 16000 pairs of numbers are stored in an array,
the array might be hold in the cache memory.

If 16000 points are point objects refered to by a Java
container, they might be spread accross the heap memory.

Custom code offers more points for tweaks than a
third-party library.

 

[softwarepearls_com]

If you browse the official JFreeChart forums, you'll come across a
long and detailed post about how to tweak key classes to cope better
with large datasets.

 

[Arne Vajhøj]

We are currently using JFreeChart to do some drawing of graphs and are
finding it to be extremely slow with large datasets. For example, we
need to draw and redraw 16000 x,y datapoints allowing zoom, scrolling,
the usual stuff.

We used to do this in C++ using PEGraph and it is super fast, with no
discernable redraw time but JFreeCharts is quite slow (up to 1 second,
which for our users is a lot).

Are there better java packages available for this kind of thing? Can
anyone point me to them? It does not need to be free, we will pay for
the best one.

JFreeChart is pretty good in functionality.

I doubt that it is even written with the intention of being
super fast.

But maybe you can get it to run faster. First step would be
to analyze where it is slow.

Arne