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z-buffer and /noerase ? [message #41692]

Tue, 09 November 2004 09:19

sandrokan
Messages: 20
Registered: September 2004

Junior Member

Ave, IDL users!

I've got two contour maps that should be drawn over an image, and I'm using
contour with /noerase key.

One could expect that the second contour would be drawn over the first one.
Strangely, if I use "set_plot, 'z'" command, the order is reversed (the
first one is over the second one). Please see this code:

pro test3
device, decomposed=0
loadct, 13
set_plot, 'z'
erase
a=dist(50) gt 10
contour, a, levels=[.5], color=200, /noerase

contour, a-1, levels=[-.5], color=100, /noerase

a=tvrd()
set_plot, 'win'

tv, a
end

I got a yello line (color=200) instead of the plue line (color=100).
This problem does not happen if I use the win device....

Thank you very much for any explanation. I use IDL5.2...

A

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