ps-bar-utils: A postscript library for drawing bar charts, with error bars
(c) Greg Benison, 2011
You use the file by importing 'bar-utils.ps' into a postscript file.
See file 'example-1.ps' for a demonstration of usage.
The API consists of the following functions (arguments given first, the way they would
be passed in postscript postfix notation):
<y> <dy> bar % Append a bar to the graph of height 'y' and error 'dy'
next-category % Switch to a new category. The value of /category-name will be
% applied as a label to the just-closed category.
<msg> legend % Append a legend entry. <msg> is either a string or a procedure
% which draws some kind of label.
<label> plot-label % draw a label at the top of the plot
<label> y-label % Apply a label to the Y axis. <label> can be either a string or
% a procedure which draws the label.
<delta> y-tic-with-interval % Draw tic marks every 'delta' positions along the y-axis.
In addition there are symbols whose definition can be changed to alter the plot appearance. These
appear at the top of bar-utils.ps. See the example for usage.
barstyles -- This array controls bar appearance; see definition in file
bar-width
bar-margin
category-margin
world-y-max
world-y-min
plot-height
category-name
crossbar-linewidth
crossbar-width
tic-font
tic-length
label-font
legend-margin-x
legend-top-margin
legend-dy
legend-box-size
y-label-margin
plot-label-font
plot-label-margin-x
plot-label-margin-y