On Friday 22 November 2002 6:15 am, Keith Packard wrote:
> Around 5 o'clock on Nov 22, John Tapsell wrote:
> > Sorry for being slow, but why isn't the display dpi good?
> > You could try to always make the cursor 1cm big for example - isn't that
> > a good thing?
>
> Mostly what you need is bigger cursors on bigger screens.  Display DPI is
> a miserable metric for that; I use really small cursors on my 320x240 iPAQ
> which is well over 100dpi.  At the same DPI on my 1600x1200 screen, I'd
> want a much bigger cursor.

Agreed.
Perhaps you could work out a function.

The size of the cursor should be proportional to DPI.  For a screen of size 
'screen_size', if I double the dpi, then I want to double the number of 
pixels for the cursor.  Agreed?

If the screen_size  is halved, then you probably don't want the cursor size to 
be halved - but you do want to shrink it a bit.  It is unclear whether this 
is a linear function.

Perhaps we could try to work out the best size for a cursor on an ipaq, the 
best size for a cursor on a 14" screen, and the best size for a cursor on a 
21" screen, and try to fit that to a linear/quadratic function, and then test 
that against some other size screens.

cursor_size = A(screen_size)*screen_size*dpi*accesibility_ratio

Where A is a function of screen_size, and returns the ratio, and
accessibility_ratio is the value in the kde/gnome accessibility panel for 
doubling the size of the cursor etc for ppl with poor sight (NOT intended for 
people with normal sight trying to see the cursor on their large screen - 
that would be in the function A)


Thoughts?

JohnFlux
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