2013/6/21 Barend Gehrels <span dir="ltr">&lt;<a href="mailto:barend@xs4all.nl" target="_blank">barend@xs4all.nl</a>&gt;</span><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<div class="im"><br>
<br>
On 20-6-2013 11:26, TONGARI wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
I&#39;m not quite understand why we need traits::closure for Ring &amp; Polygon, aren&#39;t these always closed?<br>
What should I expect if the closure is open? Should I see Ring as Linestring then?<br>
</blockquote>
<br></div>
No (about the last question).<br>
<br>
Apparently the doc about closure should be updated. However, this page explains it clearly:<br>
<br>
<a href="http://www.boost.org/doc/libs/1_53_0/libs/geometry/doc/html/geometry/reference/enumerations/closure_selector.html" target="_blank">http://www.boost.org/doc/libs/<u></u>1_53_0/libs/geometry/doc/html/<u></u>geometry/reference/<u></u>enumerations/closure_selector.<u></u>html</a></blockquote>
<div><br></div><div>Yah, I somewhat missed that page, seems it does contain the info I needed.</div><div>Since I&#39;m writing my 2d graphics lib, I always think the lib should close it anyway for drawing, but I don&#39;t know how it matters in the context of geometry operations...</div>
<div><br></div><div>Thanks.</div></div>