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Re: plot bar graph in Postscript [message #80956]

Mon, 30 July 2012 05:07

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

joa writes:

> I am trying to plot a histogram. I have both the data and normal coordinates of each rectangle that makes a bar graph, say, (x0[i],y0[i]),(x1[i],y0[i]),(x1[i],y1[i]),and (x0[i],y1[i]). Then
> for i=0, nt-1 do polyfill,[x0[i],x0[i],x1[i],x1[i]],[y0[i],y1[i],y1[i],y0[i]] , should make the graph. Yes, it looks fine on an IDL X window. But it does not translate to a Postscript file, in which the some bars appear slightly shifted in X-direction. I even tried
> for i=0,nt-1 do tv,bytarr(1,1)+120b,x0[i],y0[i],xs=x1[i]-x0[i],ys=y1[i]-y0[i ],/norm (120b is just to make the bars gray), but the result was the same.
>
> Is this a known feature of IDL? Could you advise how to make uniform bars in Postscript?

This is basically how I draw bars in cgHistoplot. I've
never seen any kind of a problem in PostScript:

http://www.idlcoyote.com/graphics_tips/histoplot.php

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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		Re: plot bar graph in Postscript By: David Fanning on Mon, 30 July 2012 05:07
		Re: plot bar graph in Postscript By: joa on Wed, 01 August 2012 08:22

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