Contour plots and data plotting

["Jeffrey A. Edlund" <jaedlund@glaxonlabs.com>]

Thanks for the ideas on making contour plots.  After playing around with
ePiX a bit I've decided that I'll try a simple implementation of
contours using a linear interpolation between the points and work up
from there after I get that working.  

Right now I'm having a problem with paths in data plotting.

I have number of very finely sampled datasets x,y which I'd like to plot
on the same greyscale figure. I'd like to make the curves distinguishable
by using dashed, dotted, and solid lines.  Unfortunately it appears that
the dotting and the dashing starts over at each data sample which just
gives me a bunch of tiny dots regardless of the settings of
dash_length() or dot_sep(). 

dashed(0.20);
plot("GC-1year-0.1-5", PATH, 6, 1, 3,0,function); //just gives lots of little dots on the curve
line(P(0.1,0.35-0.0125),P(0.2,0.35-0.0125));  // gives a properly dashed line

Is there someway to change this behavior? Can the dashed line just be
bent at the vertex instead of starting again?  This ability will be
important for contour plots as well. 

Thanks,

Jeffrey