[ncl-talk] emphasize every parts of a line with different colors according to its y value.

[Rick Brownrigg]

Hi,

I don't know of any way of doing this other than to draw the line
piecewise.  What about something like:

datadims = dimsizes(data)  ; assuming your data is 2xN
numlinesegs = datadims(1) - 1
linesegs = new((/ numlinesegs/), graphic)
do i=1,numlinesegs
  color = ....appropriate logic to determine the color here...
  res at gsLineColor = color
  linesegs(i) = gsn_add_polyline(wks, plot, data(0, i-1:i), data(1, i-1:i),
res)
end do

This is not particularly efficient, and there may be better ways of doing
this, but that should work.

HTH...
Rick


On Fri, Dec 30, 2016 at 12:48 AM, grace <313695096 at qq.com> wrote:

> Hi:
>   All,I am trying to  draw a line  that emphasize every parts of it with
> different colors.
> I have found the example xy_12.ncl which highlight the wanted part by
> split the data.
> But I want to draw a line which have different colors according to its y
> numberical value,just like the plot below.
> If I split the data ,that would be a huge work.
> Have anybody drawed plot like this ?Any information will be appreciated.
>
>
>
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