labeling - Is it possible to write a label expression in qgis that displays the label at a given coordinate?

I am using the QGIS expression builder for the label properties of my data.

Is it possible to put different parts of the label in different coordinates on the map?

For instance I have a linestring and I would like to have "A" displayed in the beginning of the linestring and "B" in the end of it.

Answer

One method is to use Rule-based labelling and adding two rules for "A" and "B".

1. 
   

   Go to Layer Properties > Labels and change the option No labels to Rule-based labelling. Then add a rule by clicking the green plus icon:

   
   
   

   

   
   


2. 
   

   Set the relevant options as shown such as Label with (use something 'A') and the Coordinate X Y. For the x-coordinate, click Edit... and use $x_at(0) to place the label at the start of the linestring; for the y-coordinate, use $y_at(0).

   
   

   

   
   


3. 
   

   Repeat Step 2 for "B" but for the x-y-coordinates, use $x_at(-1) and $y_at(-1) respectively for the end of the linestring.

   
   


4. 
   
   

   When you click Apply, hopefully you should see something like this: