topic Re: Coordinate problem with annotate dataset with G3D in Graphics Programming

Coordinate problem with annotate dataset with G3D

deleted_user — Thu, 04 Nov 2010 20:18:00 GMT

Hi all,

I am trying to plot additional features over my surface plot by G3D procedure, however I am having problems setting the correct coordinate value.

I want an arrow to be placed at a certain location, and the whole domain is:

x=20-60 (latitude)
y=200-260 (longitude)
z=10.000-7.000 (pressure)

I am defining my x y z coordinates in the annotate dataset as the actual values in the original dataset i.e. x=20 y=200 z=10.000 (the origin) and set my xsys ysys zsys variables to "3".

However the arrow appears not in the exact x y z location but shifted with some arbitrary value in all 3 dimensions.

What can be the reason for this??

Thanks a lot.

Re: Coordinate problem with annotate dataset with G3D

GraphGuy — Fri, 05 Nov 2010 12:22:58 GMT

xsys, ysys, zsys = "3" treats the coordinates as "% of the graphics area", therefore x=20 is treated as 20% of the way from the left side of the graphics area, etc.

Since you are using actual (data) values as your x, y, z then you will want to use xsys, ysys, zsys = "2".

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For more info on the xsys/ysys coordinate system values, the following table might help:

http://support.sas.com/documentation/cdl/en/graphref/63022/HTML/default/images/annodata-fig3.gif

Re: Coordinate problem with annotate dataset with G3D

deleted_user — Fri, 05 Nov 2010 18:11:18 GMT

Oh yeah thats it. Thanks..