<div dir="ltr">Hello,<div>I see three possibilities:</div><div>1) Change to say Font Table 18 and draw a character using gsn_text (or some other NCL gsn*text function).</div><div>2) Create 2 empty arrays (with the exception of one point) that contain the u and v information of your proposed arrow, and use gsn_csm_vector to create the single vector. </div><div>3) Use Illustrator or some other external package to add the arrow.</div><div><br></div><div>Option 2 seems like it would involve too much work. I have attached a script that shows how to do option #1. I started off with the first example on the Color Fill Applications page here:</div><div><a href="http://www.ncl.ucar.edu/Applications/color.shtml#ex1">http://www.ncl.ucar.edu/Applications/color.shtml#ex1</a><br></div><div>and modified it to add a single vector, using the Font Table #18:</div><div><a href="http://www.ncl.ucar.edu/Document/Graphics/Images/font18.png">http://www.ncl.ucar.edu/Document/Graphics/Images/font18.png</a><br></div><div>and the arrow drawn by specifying the "o" character. Note that you will need to play a bit with the txres resources to get the angle, size, and thickness of the arrow to where you want it: </div><div><a href="https://www.ncl.ucar.edu/Document/Graphics/Resources/tx.shtml">https://www.ncl.ucar.edu/Document/Graphics/Resources/tx.shtml</a><br></div><div><br></div><div>Hope that helps. If you have any further questions please respond to the ncl-talk email list.</div><div>Adam</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, May 9, 2017 at 6:48 PM, wen <span dir="ltr"><<a href="mailto:wenguanhuan@163.com" target="_blank">wenguanhuan@163.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="line-height:1.7;color:#000000;font-size:10px;font-family:Arial"><div>Hi all,</div><div> I am trying to draw a vector over one area, similar with the figure bellow. But I have not found the example on the official website. Is there anybody knowing how to draw it? Please tell me. Thank you!</div><div><br></div><div><div>
<img></div></div><div> <img src="cid:136d8768$1$15befd41fff$Coremail$wenguanhuan$163.com" style="font-size:10px;line-height:1.7;width:634px;height:504px"></div><div><img></div><div>
<img></div><div style="zoom:1">--<br><div>祝好</div>
<div>温冠环</div><div style="clear:both"></div></div></div><br><br><span title="neteasefooter"><p> </p></span><br>______________________________<wbr>_________________<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><div><span><font color="#888888">Adam Phillips <br></font></span></div><span><font color="#888888">Associate Scientist, </font></span><span><font color="#888888">Climate and Global Dynamics Laboratory, NCAR<br></font></span></div></div><div><span><font color="#888888"><a href="http://www.cgd.ucar.edu/staff/asphilli/" target="_blank">www.cgd.ucar.edu/staff/asphilli/</a> </font></span><span><font color="#888888">303-497-1726 </font></span></div><span><font color="#888888"></font></span><div><div><span><font color="#888888"><br></font></span><div><span><font color="#888888"><a href="http://www.cgd.ucar.edu/staff/asphilli" target="_blank"></a></font></span></div></div></div></div></div></div></div></div></div></div></div>
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