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I need to dynamically translate points 20 metres from their original point to a suitable cartographic position. I have a rotation value stored in a rotation attribute.

I cannot use this tool right because I cannot give values when using the function cos ("rotation") * 20 or sin ("rotation") * 20

Only number inside ' (single quotation marks) are accepted. How I can use function inside double offset definition?

enter image description here

Sorry about Finnish interface!

enter image description here

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  • If you add a textfield to the feature containing something like 20,50 the offset works.
    – Erik
    Commented Aug 12, 2019 at 7:24

1 Answer 1

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You need to transform each number into string representations, and combine those with a comma. Based on your screenshot above, the proper expression would be:

to_string(cos("rotation")*20) || ',' || to_string(sin("rotation")*20)
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  • yes, exactly! Thanks very much! =)
    – Mickeler
    Commented Aug 12, 2019 at 7:55

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