Re: drawing a very long line on the screen and how much of the lifting I have to do

Hi Tim,


thanks for that will bare it in mind.


Nathan

On 28/05/2021 22:45, Tim Roberts wrote:
> Nathan smith wrote:
>>
>> Regarding the pixel v.s. CM rule, I just did a google on the matter 
>> which told me a probably inaccurate figure, though it worked for 
>> rough testing purposes.
>>
>> I ended up going with around 12.5 pixels to the half CM.
>
> As long as you're just using it for relative placement, that's 
> perfectly OK.  But if you're doing something where real-world 
> measurements matter, it's not that easy.  12.5 pixels per 0.5cm comes 
> out to 64 pixels per inch.  Most Windows displays run 96 ppi, many run 
> 120, but these days the variation is quite large.
>
> It's quite possible your app doesn't care -- most don't  -- but it's 
> something to tuck away for later.
>

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