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Horizontal dotted lines using PLOTS
- Subject: Horizontal dotted lines using PLOTS
- From: "Oliver Smith" <osmith(at)dera.gov.uk>
- Date: Tue, 18 Jul 2000 11:59:24 +0100
- Newsgroups: comp.lang.idl-pvwave
- Organization: Defence Evaluation & Research Agency
- Xref: news.doit.wisc.edu comp.lang.idl-pvwave:20280
Okay maybe I'm being too much of a perfectionist but this is really
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'
for 0 = white pixel
for # = black pixel
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?