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Re: symsize in data units [message #66292]

Mon, 04 May 2009 19:29

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On May 4, 5:31 pm, pyoac...@gmail.com wrote:
> > I think it's impossible to do with PSYM or SYMSIZE.
>
>
>
>> On the other hand, it's simple enough to write a small procedure that
>> OPLOT's what you want, in the units you want. For example, a circle
>> could be done like this,
>
>> pro plot_circle, xcent, ycent, symsize=radius, _EXTRA=extra
>> th = 2*!dpi/100*dindgen(101)
>> if n_elements(radius) EQ 0 then r = 1 else r = radius(0)
>> x = r*cos(th) & y = r*sin(th)
>> for i = 0, n_elements(xcent)-1 do $
>> oplot, xcent(i)+x, ycent(i)+y, _EXTRA=extra
>> end
>
>> Then you can call PLOT_CIRCLE, x, y, symsize=4.5
>
> Thanks Craig, that works great. I replaced your oplot with a polyfill
> so I could get solid points. I was also surprised that I can get this
> to make smaller postscript files than using the plotsym procedure. I
> thought for sure your routine would make giant output.

Heh, if you want a bigger postscript file, you could change the 100
above to 1000 :-)

It's strange you say PLOTSYM makes bigger files, since it seems to use
only 50 points instead of 100 to construct a circle.

Craig

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		Re: symsize in data units By: Craig Markwardt on Mon, 04 May 2009 19:29
		Re: symsize in data units By: pyoachim on Mon, 04 May 2009 14:31
		Re: symsize in data units By: Craig Markwardt on Sun, 03 May 2009 18:21

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