[Plplot-devel] PLplot representation fidelity

[Geoffrey F. <fu...@li...>]

Greetings all,

In the state of the union address, I had mentioned:

 > Distortion: 
 >     highly zoomed plots (Tk driver) show obvious coordinate 
 >     distortion.  Believed traceable to 16 bit (short) ints in 
 >     core->driver interface.  Fatten virtual coord rep to 32 bits.  
 >  
 >     Tasks: 
 >         core->driver dispatch funcs line, polyline, short->int 
 >         plmeta, dump 4 bytes instead of 2 
 >         plrender, bump metafile version, backward handling for old 
 >                   metafiles. 
 >         dashing: currently walks virtual pixels one-by-one, horrific 
 >             if expand coord space by 2^16.  Need to revamp dashing to 
 >             /calculate/ (in world coords) dash starts and stops, 
 >             including bracketing so polyline can turn corners 
 >             correctly.  
 >         Tk driver, like plmeta/plrender, bump transmission to use 4 
 >             bytes instead of 2. 

I wanted to show an example that shows what I'm talking about here.

I'm attaching three files which show a PLplot plframe inside a Tk application
that I'm working on these days.