[reportlab-users] Bar/plot combo chart with labels for endpoint values?

[Stevens, Ian]

Thanks for clarifying, Robin.  I was thinking it would have to be a
custom job.  Thanks also for outlying the steps and potential stumbling
blocks ... Wasn't expecting that. 

Ian.


> -----Original Message-----

> From: reportlab-users-bounces at reportlab.com 

> [mailto:reportlab-users-bounces at reportlab.com] On Behalf Of 

> Robin Becker

> Sent: Monday, February 04, 2008 1:11 PM

> To: Support list for users of Reportlab software

> Subject: Re: [reportlab-users] Bar/plot combo chart with 

> labels for endpoint values?

> 

> Stevens, Ian wrote:

> > Can the open source version of Reportlab be used to create 

> a combo bar 

> > and plot chart?  Is it also possible to label the endpoint 

> values of 

> > plots on a plot chart?  If not, are these features available in the 

> > commercial version?

> >  

> > Here's an example of what I'm talking about:

> >  

> > 

> https://hermes.manulife.com/Canada/wmCentralObjects.nsf/LookupFiles/Q4

> > 20 05i-WatchChartIWM_Balanced_Q4_2005/$File/IWM_Balanced_Q4_2005.gif

> >  

> > thanks,

> > Ian.

> .......

> we've certainly done bespoke charts that look similar, but 

> there isn't anything builtin that just does all of the 

> features. To do this kind of chart I believe the process is

> 

> 1) derive from the barchart; set up grids etc etc etc.

> 2) ensure the scales are set up so everything on the y axis 

> will work. That's probably best done by overriding the draw method.

> 3) draw the bar chart.

> 4) add stuff like the lines and annotations explicitly using 

> the scales set up by the bar chart.

> 

> It's not exactly clear from the exemplar whether the 

> cumulative line plots are smooth or not? Clearly the barchart 

> is quarterly ie regularly spaced on the x-axis, but the 

> lineplots could be on a daily/monthly support etc etc which 

> would complicate stuff.

> --

> Robin Becker

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