Re: Fixed points not showing on plot. Fixed Plot_xcb.cc. Image results on my website, will do some tests.

[Dr . Jürgen Sauermann]

  
  
    Hi again,
      
      forgot to mention how each of the plots was created:
      
          Q←"""
      canvas_color:  #777
      point_size-1: 3
      point_style-1: 1
      line_width-1: 1 pixel
      point_color-1:#F84
      line_color-1:#F84
      """
      
            Q ⎕PLOT 1○(⍳250)÷40
      
      Best Regards,
      Jürgen
      
    
    On 12/29/20 8:56 PM, Dr. Jürgen
      Sauermann wrote:
    
    
      
      Hi Mark,
      
      I have investigated the "point-size" problem and found out the
      following:
      
      On my 32-bit machine (where Plot_xcb.cc was mainly
      developed) the
      problem does not show.
      
      On my 64-bit system (where I hardly use Plot_xcb.cc) the
      problem
      shows up. As far as I can see, all xcb_fill_xxx()
      functions have that
      problem. The desired area, be it rectangles, polygons, or
      ellipses, is
      not filled with the colour set by XCB_GC_FOREGROUND (as they
      should IMHO), but is instead filled with the background color.
      Also,
      the window caption seems to be broken in the 64bit version (it
      worked
      better with the 32 bit version).
      
      I am afraid that I can't do anything about this (I tried but
      failed to
      find the source code for the xcb_fill_xxx()
      functions on the web).
      
      The gtk-3 version shows none of these problems and is the
      currently
      recommended version anyhow, so I would try to get that one working
      on your Mac.
      
      If anybody has a clue what all this is about then please let me
      know and I'll try to fix it.
      
      Best Regads,
      Jürgen
      
      
      On 12/24/20 10:11 PM, geme...@idirect.com
        wrote:
      
      
        Hi Jurgen;
I've got a fix for the dot-points not plotting.
I had to set point_style-1 or point_size-1 to zero to see plot line.
If points were plotted, the data line would be blanked out.
I fixed: Plot_xcb.cc
Looks ok, but I want to run tests.

I put  examples on my website:  http://www.gemesyscanada.com

First image shows fixed results.
Data points can be put on plot, and can also be made hollow.

The libxcb stuff is nice, since I have it installed from source now
on the Macbook, and it works with XQuartz (the X11 stuff for MacOSx).

This means Linux boxes and Macbook can run same, and current version
of GNU-APL.  This is good.
This GNU-APL is really a fine thing. It is fine work, such good code.
- Mark

PS; Happy Christmas!