<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="NO-BOK" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Hello list, I think i might have found a bug in the split control (or, more likely, the split-function of LineString, which the split control uses)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Look at the following example:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">var line1 = new OpenLayers.Geometry.LineString([new OpenLayers.Geometry.Point(1,1),new OpenLayers.Geometry.Point(6,1)]);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">var line2 = new OpenLayers.Geometry.LineString([new OpenLayers.Geometry.Point(2,1),new OpenLayers.Geometry.Point(3,1),new OpenLayers.Geometry.Point(6,3)]);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">var split = line1.split(line2,{mutual:true});<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">this returns two lists, line1 is split into:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(1 1, 3 1)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(3 1, 6 1)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">And line2 is split into<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(2 1, 3 1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(3 1, 6 3);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I would expect that line1 would be split into three lines:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(1 1, 2 1)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(2 1, 3 1)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(3 1, 6 1)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If we reverse line2, and try to split, like this:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">var line1 = new OpenLayers.Geometry.LineString([new OpenLayers.Geometry.Point(1,1),new OpenLayers.Geometry.Point(6,1)]);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">var line3 = new OpenLayers.Geometry.LineString([new OpenLayers.Geometry.Point(6,3),new OpenLayers.Geometry.Point(3,1),new OpenLayers.Geometry.Point(2,1)]);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">var split = line1.split(line3,{mutual:true});<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We see that line1 is split into<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(1 1, 3 1)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LINESTRING(3 1, 6 1)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">But line3 is not split at all.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So, to me it seems that if segments are fully overlapping they do not split. Is this a feature or a bug?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">And in any case, any pointers on how to solve this?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Atle<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black;mso-fareast-language:NO-BOK">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black;mso-fareast-language:NO-BOK">Atle Frenvik Sveen | Konsulent, Trondheim<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black;mso-fareast-language:NO-BOK">Bouvet ASA Kjøpmannsgt. 35, 7416 Trondheim<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black;mso-fareast-language:NO-BOK">Mob: + 47 45 27 86 89<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black;mso-fareast-language:NO-BOK"><a href="http://www.bouvet.no/"><span style="color:black">http://www.bouvet.no/</span></a> |
<a href="mailto:atle.sveen@bouvet.no"><span style="color:black">atle.sveen@bouvet.no</span></a>
<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>