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<div class="moz-cite-prefix">Hi Rémi,<br>
<br>
Thanks for your awnser.<br>
My problem is that the draw order isn't equal in all lines so the
path of st_dumppoints sometimes return ascend order and another
times descend. I need to make a loop to make a reverse...<br>
<br>
Em 25-02-2014 08:33, Rémi Cura escreveu:<br>
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cite="mid:CAJvUf_vSYhJdDU9OsgEGRXNyyi5YVe9MsHBVBQFRcpwZKrEomw@mail.gmail.com"
type="cite">
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<div>Hey,<br>
</div>
I don't understand your problem.<br>
<br>
</div>
If you have multilinestring, you need to break it to
linestring with an id per multilinestring.<br>
</div>
If you have linestring, you just need to keep an id for each
line and an id per point (given in path).<br>
<br>
</div>
Then you have several option to generate a ordered set of
point (use the ORDER BY and the row_number() postgres
function).<br>
<br>
</div>
If you give some detailled example maybe we could help better.<br>
<br>
Cheers,<br>
Rémi-C<br>
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<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">2014-02-24 19:27 GMT+01:00 Stephen
Woodbridge <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:woodbri@swoodbridge.com" target="_blank">woodbri@swoodbridge.com</a>></span>:<br>
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.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb">
<div class="h5">On 2/24/2014 11:33 AM, Pedro Costa wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi guys,<br>
<br>
I'm trying to use lines from postgis to google maps
android.<br>
To do that, I'm converting the lines to points with
St_DumpPoints and,<br>
in gmaps, I make the lines. My problem is that I
cannot create a correct<br>
sequence to order the points in android and so i get
wrong lines (see ss<br>
atached). I'm already try to use st_dumpPoints path
column and generate<br>
a serial but doesn't result.<br>
<br>
Anybody knows a solution to resolve that?<br>
</blockquote>
<br>
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</div>
You probably need to write function that re-orients you
lines before you dump them to points. The algorithm is like
this:<br>
<br>
1. for the first edge, if the start point match the the
start or end of the 2nd edge, if it does then st_reverse()
the first edge.<br>
<br>
2. for the rest of the edges, if the edge point of the
current edge matches the end point of the last edge, then
st_reverse() the current edge.<br>
<br>
You might be able to st_union all the edges into one large
edge and that should create a new reorder edge.<br>
<br>
No you can dump them and the order will be correct.<br>
<br>
-Steve<br>
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