Re: Horizontal dotted lines using PLOTS

[Declan Vogt <drv102(at)ohm.york.ac.uk>]

I'm using IDL Version 5.1 on Windows NT 4, and see the same problem as
Oliver, when running his code. For what it's worth, I'm running 1024x768
in 8 bit colour, I don't know if that has a bearing on the problem.

Declan


Pavel Romashkin wrote:
> 
> I have used the exact commands you provided, and I see perfect dashed
> lines on white background. No funny L-shaped dots.
> IDL Version 5.3 (MacOS PowerMac)
> Cheers,
> Pavel
> 
> Oliver Smith wrote:
> >
> > Okay maybe I'm being too much of a perfectionist but this is really
> > annoying.
> >
> > I use dotted lines to box an area of interest, line width is two pixels. A
> > solid white line is first plotted then a dotted black line plotted on top of
> > the first. A vertical line drawn this way looks great, but a horizontal line
> > is not so good; the dots that make up the black line are not square, but 'L'
> > shaped.
> >
> > [ snip - snip ]
> >
> > IDL Version 5.3.1 (Win32 x86). (c) 2000, Research Systems, Inc.
> >
> > IDL> plot, findgen(100)
> > IDL> plots, [20,20], [10,80], linestyle = 0, color = 255, thick = 2, /data
> > IDL> plots, [20,20], [10,80], linestyle = 1, color = 0, thick = 2, /data
> > IDL> plots, [20,80], [10,10], linestyle = 0, color = 255, thick = 2, /data
> > IDL> plots, [20,80], [10,10], linestyle = 1, color = 0, thick = 2, /data
> >
> > The horizontal line ends up looking very poorly defined if it is drawn on
> > top of a relatively light coloured background.
> >
> > So can anyone reproduce this, and can anyone come up with a work-around
> > without changing the thickness of the lines?
> >
> > Thanks,
> >
> > Oliver Smith