<HTML dir=ltr><HEAD><TITLE>Re: [postgis-users] Getting dimensions of polygon sides</TITLE>
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<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Bruce,</FONT></DIV>
<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Yes that is what I was thinking. I was going to create another geometry field which is a point which represents the exact location I want the annotation placed. I was using quantum for the below snapshots and I think it just places it at the centroid of the line. I looked at it in ArcPad which is what will be used in the field and it seems to do more or less the same too although I think it auto angles so I may go with instead of centroid - just another line translated 90 degrees some x amount to the right to maintain the angularness of the text.</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>Now if only I can remember my highschool trig. What you are saying makes perfect sense though so I'm sure I will be able to figure out the functional steps with a little bit of thinking.</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>Regina</FONT></DIV></DIV>
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<FONT face=Tahoma size=2><B>From:</B> postgis-users-bounces@postgis.refractions.net on behalf of Bruce Rindahl<BR><B>Sent:</B> Thu 6/12/2008 1:03 PM<BR><B>To:</B> PostGIS Users Discussion<BR><B>Subject:</B> Re: [postgis-users] Getting dimensions of polygon sides<BR></FONT><BR></DIV>
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<P><FONT size=2>Obe, Regina wrote:<BR>> Anyrate my new problem: This whole exercise just made me realize they<BR>> must have put these polygons together with the constituent linework of<BR>> the edges. Because if I look at the abutting parcels those extra dims<BR>> represent sides of those smaller parcels. My simplify solution works<BR>> great if you are just looking at one parcel, but when you look at<BR>> abutters - it shall we say, looks crowded. So my thought is to put the<BR>> position of my length annotation inside each parcel it represents.<BR>><BR>> I'm lost how to do that. So basically jimmy the ST_Centroid(the_geom)<BR>> of my above such that it always sits inside the parcel boundary.<BR>><BR>> Thanks,<BR>> Regina<BR>> <BR>I am not sure how you are placing the annotation, but this could be<BR>interesting....<BR><BR>Looking at the aftersimplify.png, you have the length of each line<BR>segment (and the segment itself). The center point of each segment is<BR>easy. Now you need to define a line segment offset by the text height<BR>of your annotation and translate it INSIDE the polygon. The you draw<BR>(label?, annotate? ....) the text along that line. If you first update<BR>the polygon with forceRHR() then INSIDE is always to the right of the<BR>line segment. You can easily get the azmith of the linesegment from the<BR>start and end points, add 90 degrees and compute the x and y values for<BR>the translate() function. This should be basic high school trig - ;-) .<BR><BR>Is this what you are thinking of?<BR><BR>Bruce<BR>_______________________________________________<BR>postgis-users mailing list<BR>postgis-users@postgis.refractions.net<BR><A href="http://postgis.refractions.net/mailman/listinfo/postgis-users">http://postgis.refractions.net/mailman/listinfo/postgis-users</A><BR></FONT></P></DIV></BODY></HTML>
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