Re: unknown diagonal white line on gsn_csm_map plot

only a suggestion during a smoke... ;-)

i dont know the internals of the graphics subsystem, but
maybe the upper left triangle is flood-filled and mirrored on that line
to the lower right triangle and the line isn't filled with that color?

Am 18.12.2012 um 23:48 schrieb Ronny Berndt:

> Hi Rick,
>
> you are right, its independent from setting @mpLandFillColor (i changed my map corners...)
>
>> Hmmm…I believe you, but that's counter to what I was about to report. What color did you set the resource to, and which workstation device are you using (always png?)?
> x11 or png
>
>
>> For my part, what I've observed is that whenever the map background is completely solid (i.e., solid landmass or solid ocean, etc.) the line appears. If there's a sliver of ocean present against a landmass, or the presence of islands in a plot of predominantly ocean, the line does not appear. I've been reliably able to produce and predict when/if it will occur, and for me it happens whether or not mpLandFillColor is set (in fact, I set it to a dark color to emphasize the diagonal when its present). It also happens regardless of workstation type.
>
> same for me
>
>> All this and some other experiments suggests to me its an artifact of our graphics subsystem, the nature and origin of which I don't understand at the moment. Thus I don't really have a work-around to offer, other than the line seems to be less visible (but not invisible) for the older postscript/pdf formats (device names "oldps", "oldpdf" with ncl 6.1.0, or just "ps", "pdf" with 6.0.0)
>>
>> I'm going to file a ticket on this one…
>>
>> Rick
>
> on gsn_csm_contour_map, the problem doesn't seem to exist...
>
>
> Ronny
>
>
>
>
>>
>>
>> On Dec 18, 2012, at 3:01 PM, Ronny Berndt <ronny.berndt@uni-jena.de> wrote:
>>
>>> Hi,
>>>
>>> it seems that if you set the resource @mpLandFillColor the white line is gone.
>>> Is @mpLandFillColor unset, the white line comes again...
>>>
>>> Ronny
>>>
>>> Am 18.12.2012 um 21:57 schrieb Rick Brownrigg:
>>>
>>>> That's interesting -- it shows up in every output format we support. I don't know why at the moment, but am checking in to it…
>>>>
>>>> Rick
>>>>
>>>> On Dec 18, 2012, at 12:43 PM, Ronny Berndt <ronny.berndt@uni-jena.de> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> why is there a diagonal white line from the lower left corner to upper right?
>>>>> How can I prevent this?
>>>>>
>>>>> ncl-script:
>>>>>
>>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>>>>>
>>>>> begin
>>>>>
>>>>> wks_type = "png"
>>>>> wks_name = "latlines"
>>>>> wks = gsn_open_wks(wks_type, wks_name) ; Open a workstation.
>>>>>
>>>>> res = True
>>>>> res@gsnFrame = False ; Don't draw or advance
>>>>> res@gsnDraw = False ; frame yet.
>>>>> res@gsnMaximize = True
>>>>>
>>>>>
>>>>> ;---This will be our base, so make it a map plot.
>>>>> ;res@tfDoNDCOverlay = False
>>>>> ;res@gsnAddCyclic = False
>>>>> res@mpProjection = "CylindricalEquidistant" ; Projection
>>>>> res@mpOutlineOn = True
>>>>> res@mpDataBaseVersion = "MediumRes"
>>>>> res@mpOutlineBoundarySets = "AllBoundaries"
>>>>> ;res@mpOutlineBoundarySets = "National" ; country borders
>>>>> res@mpNationalLineThicknessF = 2.0
>>>>> res@mpLimitMode ="LatLon"
>>>>> res@mpMinLatF = -21.87
>>>>> res@mpMaxLatF = -11.09
>>>>> res@mpMinLonF = 14.21
>>>>> res@mpMaxLonF = 25.87
>>>>>
>>>>> Map = gsn_csm_map(wks, res)
>>>>>
>>>>> pres = True ; polyline mods desired
>>>>> pres@gsLineThicknessF = 2.0 ; line thickness
>>>>> pres@gsLineColor = "blue" ; color of lines
>>>>>
>>>>> val = gsn_add_polyline(wks,Map,(/14.21,25.87/),(/-12.63,-12.63/),pres)
>>>>>
>>>>> draw(Map)
>>>>> frame(wks)
>>>>>
>>>>> ;delete(res)
>>>>>
>>>>> ;make high density png with imagemagick
>>>>> ;delete(wks)
>>>>>
>>>>> options = "mogrify -strip -trim -geometry 1000x1000 -density 300 -units pixelsperinch " + wks_name + ".png"
>>>>> ;system(options)
>>>>>
>>>>> end
>>>>> _______________________________________________
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>>>>
>>>
>>
>
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Received on Tue Dec 18 16:04:46 2012