[Blindmath] graphics

[Emanuela Ughi]

The answer is not immediate, since it depends on the size of a single pixel
on the screen, but this is not an universal size, but it depends on the
resolution of the screen.

For example, if your screen resolution is 1024x768, this means your screen
is currently using 1024 x 768 = 786432 pixels to draw the current view – so
you need to know the screen resolution, to have the size of current view ,
and to deduce   the size of the corresponding pixel from this information
(and, be careful, the pixel is not a square, but it is a rectangle).

Using Paint, if you have an image, you can switch between size in pixels
and in centimeters, and compare them. I am sorry, I don't know the English
commands to reach this possibility, in Italian the path is
Immagine>Attributi=(CTRL+E)

Also, I found a useful address, but I have no idea if it is blind friendly:
http://tiporama.com/tools/pixels_inches.html

Emanuela

Il giorno 11 febbraio 2012 21:47, Haden Pike <haden.pike at gmail.com> ha
scritto:

> Hi all,
>
> This might be off topic for this list, but figured I'd ask here in case
> there's a mathematical formula for figuring out what I need.
>
> Anyway, as part of my intro to programming class, we are being asked to
> draw graphics on the screen in order to learn about objects.  I already
> know about them,
> but this class is required for Computer science majors, so I still have to
> do the assignment.  My question is this.  Is there any way a blind person
> can
> hope to get a since of what size something is, when specified in pixels?
>  For example, if I gave a rectangle a width of 100 pixels and a height of
> 150
> pixels, how could I determine what size the rectangle will be on the
> screen.
>
> Thanks for any help,
> Haden
>
>
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-- 
Emanuela Ughi
Dipartimento di Matematica e Informatica
Via Vanvitelli 1 - 06123 Perugia
(39) 340 3341040