It may be worth having a look into highcharts/highstock which does a lot
of optimizations related to large data sets:
http://www.highcharts.com/stock/demo/data-grouping
http://www.highcharts.com/stock/demo/lazy-loading
I'm using highcharts in our apps successfully with qooxdoo, but not with
such large data sets.
Regards
Dietrich
Am 14.07.2015 um 14:36 schrieb Vishal:
Phyo, Thanks for the links.
Dear friends,
I want to switch to a general discussion on handling large data sets
for drawing charts. I have used jqplot metergauge renderer with live
data and have also included easing functions to make the gauge look
like an actual analog meter. Myself and product reviewers are quite
satisfied with the end result. So from that I experience, I think
creating live charts (running) charts with jqplot should satisfy our
purpose.
But the meter gauge renderer takes exactly 1 data point everytime (x =
1, and y = actual location of the pointer)
The big difference with line charts is that the data set contains
multiple points. Currently my requirement is about *5000 points /
series*. There are upto*7 series* that need to be visible at any time.
Ofcourse the actual data set that needs to be stored in memory (either
at the browser or at the server) is larger..its about 200,000
points/series for 7 such series.
My strategy is to have an Array() (created like so: this.series1 =
[];) for each actual data set. The max length is always chosen by the
user from the chart controls. Then we make slices from this data set
and send them to chart.redraw(). However, when the number of data
samples exceeds the actual data set length, we need to do something
like this, everytime we get new data from the server.
What do you think of this?
dataset.shift();
dataset.push(new_data);
the above is prohibitively long for most interactions. On Chrome
console, doing the above for a 200000 element array is of the order of
1s or more average case...and sometimes when there are too many tabs
open...it has taken more than 10s.
The real issue I think is that Array() operations like push(), shift()
even though highly optimized, are still are O(N) operations.
if Array() was implemented using a linked list...could this be easier.
if yes, are there any options like this?
Thanks and best regards,
Vishal Sapre
Thanks and best regards,
Vishal Sapre
---
Please DONT print this email, unless you really need to. Save Energy &
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On Mon, Jul 13, 2015 at 10:10 PM, Tobias Oetiker <t...@oetiker.ch
<mailto:t...@oetiker.ch>> wrote:
Today Phyo Arkar wrote:
> https://github.com/oetiker/RrdGraphJS
note that the documentation part is maynly for the Png version ...
cheers
tobi
>
> On Mon, Jul 13, 2015 at 8:29 PM, Vishal <vsapr...@gmail.com
<mailto:vsapr...@gmail.com>> wrote:
>
> > Thanks Tobias,
> >
> > Is there a demo for this grapher that you mention.
> >
> > Best regards,
> > Vishal Sapre
> >
> >
> >
> > Thanks and best regards,
> > Vishal Sapre
> >
> > ---
> > Please DONT print this email, unless you really need to. Save
Energy &
> > Paper. Save the Earth.
> >
> > On Mon, Jul 13, 2015 at 1:54 PM, Tobias Oetiker
<t...@oetiker.ch <mailto:t...@oetiker.ch>> wrote:
> >
> >> Hi Vishal,
> >>
> >> I have not ventured into using jqplot for anything 'live'
> >>
> >> I have written a live grapher with qooxdoo pretty
specialized, but
> >> maybe this can give you some insporation ...
> >>
> >>
https://github.com/oetiker/RrdGraphJS/blob/master/public/rrdGraphSvg.js
> >>
> >> it is based on D3.js since this seems to be much more
flexible than
> >> jqplot.
> >>
> >> cheers
> >> tobi
> >>
> >> Yesterday Vishal wrote:
> >>
> >> > Dear Friends,
> >> >
> >> > I have been using qxjqplot for running meters (gauges)
> >> > in my single page qx.desktop app.
> >> >
> >> >
> >> > Now I wish to use a charting library to show running live
data (like a
> >> time
> >> > series) on a chart. Going forward with qxjqplot, I have
come to a point
> >> > where data can be shown on a chart very well. However,
since the data is
> >> > always coming in fresh, I can only show a part of it while
keeping most
> >> of
> >> > the data in a background array. The user may want to stop
the charting,
> >> and
> >> > go back to some point (using a scroll bar). There is no
such facility in
> >> > jqplot, while there is something called a zoom
proxy...which is like
> >> > this: http://www.jqplot.com/deploy/dist/examples/zoomProxy.html
> >> > <http://www.jqplot.com/deploy/dist/examples/zoomProxy.html>
> >> > However, it does not really work like a scroll bar. in
addition the
> >> > controller plot itself will be getting filled in all the time.
> >> > To use this function I have to call something like this:
> >> > $.jqplot.Cursor.zoomProxy(targetPlot, controllerPlot);
> >> >
> >> > How do i call this function from qx? The qxjqplot.MPlot
mixin does not
> >> > expose jquery.jqplot object, or does it?
> >> >
> >> > Can you please point me to the right direction so as to use
the above
> >> > functionality from qxjqplot?
> >> >
> >> > What would be your suggestion to have an x axis scroll bar
to move about
> >> > the time axis?
> >> >
> >> > I also looked at the qxdygraph option. Unfortunately there
is no hint
> >> as to
> >> > how to use DyGraphs with qooxdoo. The demo given for
qxdygraph is good,
> >> but
> >> > I dont see an option to look at the actual demo code.
> >> >
> >> > Your help would be seminal for me to complete this tool.
> >> >
> >> > Thanks and best regards,
> >> > Vishal Sapre
> >> >
> >> > p.s: Please find attached my current chart tab with some
random data in
> >> it.
> >> >
> >>
> >> --
> >> Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten,
Switzerland
> >> www.oetiker.ch <http://www.oetiker.ch> t...@oetiker.ch
<mailto:t...@oetiker.ch> +41 62 775 9902 <tel:%2B41%2062%20775%209902>
> >>
> >>
> >>
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> >
> >
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--
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
www.oetiker.ch <http://www.oetiker.ch> t...@oetiker.ch
<mailto:t...@oetiker.ch> +41 62 775 9902 <tel:%2B41%2062%20775%209902>
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