Re: Arbitrary rotation of symbols?

Eric Patton <[email protected]> Thu, 17 Jul 2014 12:50:21 -0300
Newsgroups gmane.comp.gis.gmt.user
Message-ID <20140717155021.GD2322@w5-dar-epatton>
Thanks, but I was asking if it is possible to rotate a triangle symbol in
psxy, or by some other method. The paths for my vectors have already been
digitized by hand. I want insert rotated arrowheads at their endpoints.

~ Eric.

On Thu, Jul 17, 2014 Joaquim Luis wrote:
> We have curved vectors now on 5 (don't remember the details without
> consulting the manual). See for example
> 
> http://gmt.soest.hawaii.edu/doc/5.1.1/_images/example_30.png
> 
> >I have generated a shapefile of glacial lineations using a GIS, and have
> >successfully converted the line shapefile to GMT format using OGR. The
> >lineations plot fine in GMT.
> >
> >These features are similar to vectors, in the sense that they illustrate
> >direction of flow, but they are different in that they are not described by a
> >length and azimuth as vectors are using -Sv; they curved lines. I want to show
> >the direction of flow by placing a triangle at the last x,y coordinate in the
> >line segment, but is it possible to rotate a triangle symbol so that the
> >triangle head is oriented correctly with respect to the trend of the line?
> >
> >This is basically the same issue described in
> >https://listserv.hawaii.edu/cgi-bin/wa?A2=ind0801&L=GMT-HELP&P=R52411&1=GMT-HELP&9=A&I=-3&J=on&d=No+Match%3BMatch%3BMatches&z=4
> >
> >but I'm not sure if the functionality has been added in the intervening 6
> >years. The psxy manual doesn't seem to indicate that there is, but I thought I
> >would ask anyway.

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