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I'm labelling the starting point of a line to give an indication of direction for referenced photos. I've found the first node of the line somewhat long-windedly as per screenshot, but I'm not sure how to centre the label on it.

An alignment expression seem like it would be the ticket but I think I'm struggling with how to define the label rather than the line geometry in order to relate them.

Browsing past questions it seem like I could've just gone with xat (0) for the first node, duly noted!

Edit - I was treating the strings in the Alignment expression like a function, without quotes.

screenshot

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  • I'm not sure how to reply to moderator edits but centre/centring is British English, not a typo.
    – user90134
    Commented Jan 23, 2017 at 21:15

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If you want to place the label at the start of the line, try to use the following formula for x coordinate:

x_at(0)

And use the following formula for y coordinate:

y_at(0)

To align the labels at the center of the circle in your example, you need to use the Alignment horizontal and vertical:

enter image description here

In alignment horizontal write 'Center', and alignment vertical write 'Half'. You will get the following result, which is exactly what you need:

enter image description here

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  • Brilliant thanks! I thought I'd already tried this, but I was treating them as a function, without the quotes.
    – user90134
    Commented Jan 23, 2017 at 20:55

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