https://issues.qgis.org/https://issues.qgis.org/favicon.ico2018-09-25T15:44:59ZQGIS Issue TrackingQGIS Application - Feature request #19943: Extend algorithm only extends, but does not shorten lineshttps://issues.qgis.org/issues/19943?journal_id=934532018-09-25T15:44:59ZHarrissou Santanna
<ul></ul><p>This is more a feature request than a bug report I think. I'm not sure that the Extend algorithm is supposed to shorten the lines (at least, I did not read such expectations in the linked documentation).</p> QGIS Application - Feature request #19943: Extend algorithm only extends, but does not shorten lineshttps://issues.qgis.org/issues/19943?journal_id=934552018-09-25T15:45:26ZHarrissou Santanna
<ul><li><strong>Status</strong> changed from <i>Open</i> to <i>Feedback</i></li></ul> QGIS Application - Feature request #19943: Extend algorithm only extends, but does not shorten lineshttps://issues.qgis.org/issues/19943?journal_id=934592018-09-25T16:05:26ZGiovanni Manghigiovanni.manghi@gmail.com
<ul><li><strong>Tracker</strong> changed from <i>Bug report</i> to <i>Feature request</i></li></ul> QGIS Application - Feature request #19943: Extend algorithm only extends, but does not shorten lineshttps://issues.qgis.org/issues/19943?journal_id=934742018-09-25T18:33:27ZNyall Dawson
<ul><li><strong>Status</strong> changed from <i>Feedback</i> to <i>Rejected</i></li><li><strong>Resolution</strong> set to <i>wontfix</i></li></ul><p>There is a seperate algorithm for shrinking lines - "line substrings".</p> QGIS Application - Feature request #19943: Extend algorithm only extends, but does not shorten lineshttps://issues.qgis.org/issues/19943?journal_id=934822018-09-25T19:59:41ZHarrissou Santanna
<ul></ul><p>I had looked for it but obviously with wrong tags, hence <a class="external" href="https://github.com/qgis/QGIS/pull/8025">https://github.com/qgis/QGIS/pull/8025</a></p> QGIS Application - Feature request #19943: Extend algorithm only extends, but does not shorten lineshttps://issues.qgis.org/issues/19943?journal_id=934882018-09-25T21:22:42ZCarlos Cámaracarlos.camara@gmail.com
<ul></ul><p>I am using 3.2.3 and I can't find such <code>line substring</code> algorithm. I haven't found any reference on documentation, neither.</p>
<p>Since I have not used it, I am not sure how that algorithm works, but I would suggest reconsidering reopening this issue as a feature request if it does not work like that:</p>
<p>Imagine that I want to change the length of a line according to a field, which may be positive (extend) or negative (shrink). IMHO it would be great to solve this by using a single tool, not two different ones. I am not a programmer at all, but I cannot see any difference in changing a line's length while keeping its direction, no matter if that length is positive or negative.</p>