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[NCL] 小技巧
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pattern = "$$$$______$$$$______$$$$______$$$$_____$$$$______"
res@xyDashPatterns = NhlNewDashPattern(wks,pattern)
Important resources for controlling the length, density, direction, and style of vectors:
- vcGlyphStyle - "LineArrow"
(default), "FillArrow", "WindBarb", "CurlyVector"
- vcMapDirection - set to False
if not drawing vectors on a map and you have a vertical
plot where the two coordinate axes have different units with very
different numerical spacing between the coordinate values.
- vcMinDistanceF - set to small
value to thin the vectors.
- Use these three resources to control the length of vectors:
4) 设置cmyk 颜色模式
CMYK color https://www.ncl.ucar.edu/Applications/colormap.shtml
If you need to use CMYK color, then this is only supported with the
old style color model (pre NCL V6.1.0), and hence you must use "oldps"
or "oldpdf" as the output format. You can set this via a workstation
resource, before you
call gsn_open_wks:
type@wkColorModel = "cmyk"
wks = gsn_open_wks(type,"example")
Note: a user reported a noticeable degradation in the color quality when using the old postscript and pdf drivers along with the CMYK option. He said he's been able to submit RGB figures to various journals for the last few years, and never had a problem. If you have to send in CMYK graphics, then submit the figures as RGB (which is the default in NCL), and then use an external package like Illustrator to convert them to CMYK.