line type 0: wxt vs pngcairo

[Allin C. <cot...@wf...>]

Here's an issue which (hopefully) ought to be somewhat simpler than 
the last one I mentioned -- although I've taken a look in the code 
and I'm having difficulty seeing where it's coming from.

Here's a trivial test case (uncomment one or the other term/output):

<gnuplot>
set term pngcairo size 640,480 font "Sans,10"
set output 'pngcairo.png'
# set term wxt size 640,480 font "Sans,10"
plot '-' notitle w l, 0.10 notitle w l lt 0
1 0.5
2 -0.5
3 0.5
4 -0.5
5 0.5
6 -0.5
</gnuplot>

I'm comparing the pngcairo.png produced via the pngcairo terminal 
and a file named wxt.png which I produced via the "Save File" button 
in a gnuplot wxt window (and which is a faithful rendition of what 
is displayed on-screen via wxt).

The PNG files are basically identical except for the horizontal line 
at y = 0.10 with "lt 0". With the wxt term this line is just as I 
would wish it to be; with the pngcairo term it is, IMO, too faint.

The two files (produced via the script above with current CVS 
gnuplot master) are available as:

http://users.wfu.edu/cottrell/gp5/pngcairo.png
http://users.wfu.edu/cottrell/gp5/wxt.png

-- 
Allin Cottrell
Department of Economics
Wake Forest University