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<p class="MsoNormal"><span style="font-size:11.0pt;color:windowtext">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">Is there any method or any other possibility to use bounding box of labels in QGIS geometry generator expression builder?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">I want to make a layer styling with labels with leader lines from object’s label to the object. I have a PostGIS point geometry source for the actual object and another for the
label position. They are related by attribute "id". So generally thanks to great QGIS’ geometry generator it’s easy to generate a leader line by
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Courier New";color:windowtext">make_line($geometry, geometry(get_feature('object_layer', 'id', "id</span><span lang="EN-US">
</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Courier New";color:windowtext">"))) </span><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">As an extra challenge, I want to generate the leader line from first or last character of the label, depending if first or last character is closer to the object geometry. The
label is positioned above right of label geometry. So if the first character of the label is closer, I can use above method to generate leader to lower left corner of the label. But if the end is closer I would need something like ‘label bounding box’ to generate
leader to lower right corner of the label. Currently I use <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Courier New";color:windowtext">make_line(project($geomety,length("label_string")*0.5,radians(90)), geometry(get_feature('object_layer', 'id', "id</span><span lang="EN-US">
</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Courier New";color:windowtext">"))<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">This way, I project the start point of the leader by length of label text (comes from the attribute "label_string"). With the factor 0.5 I get quite OK results for many labels,
but sometimes if the label string contains many narrow or wide characters (i,l,j resp. o,p,g) the leader’s start point doesn’t get the correct position. With ‘label bounding box’ it would be easy to always get the right position.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">Thanks for any help!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;color:windowtext">Benjamin</span><span style="color:windowtext;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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