<div dir="ltr"><div dir="ltr">On Sat, Jun 25, 2022 at 10:00 AM David Strip via Qgis-user <<a href="mailto:qgis-user@lists.osgeo.org" target="_blank">qgis-user@lists.osgeo.org</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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To the extent that anyone is interested in a discussion of adding
CAD-like dimensioning capabilities to Qgis:<br>
<br>
In a CAD model dimensional callouts present the user with
information about lengths, angles, radii, and other metric
properties. Dimension call-outs in a CAD model (probably more
accurately, a CAD drawing derived from a model) are annotations to
the model, they are not model objects per se. In a well-designed
system, the dimension call-out displays the actual metric value of
identified length, radius, angle, etc. The dimension "object" is
tied to the underlying geometric model and will change the presented
value if the underlying object is changed (eg, scaled in size). In
addition, if the underlying object moves with respect to other
objects in the model, the dimension annotations move with it,
maintaining a constant relationship, for example to the edge whose
length we are dimensioning.</div></blockquote><div><br></div><div>At the risk of stating the obvious, all of that can be done with labels in QGIS. A simple line can be annotated with angle and distance, which are dynamically updated when the line is modified. QGIS has the ability to move labels relative to the object being labeled and supports "call outs" aka "leader lines". Labels are not "model objects", in other words, labels are saved in the QGIS project, not in the underlying data. </div><div> </div></div>-- <br><div dir="ltr"><div dir="ltr">Richard W. Greenwood<br><a href="http://www.greenwoodmap.com" target="_blank">www.greenwoodmap.com</a></div></div></div>