[Blindmath] graphics

[Joseph Drenth]

Hello Haden,

If you don't have a specific monitor and resolution to use for measuring a
graphic, a general conversion factor in Windows programming is 96 pixels per
inch. For instance, for the old CRT monitors that had a viewing area
measured diagonally as 13 and a third inches, this conversion ratio would
yield a resolution of 1024 by 768, which was a common resolution for a
monitor of that size.

Using this standard display resolution, just multiply a pixel measurement by
the fraction with numerator 1 inch and the denominator 96 pixels. This means
that your example graphic of 100 by 150 pixels would be a little over an
inch by a little over an inch and a half.

Best regards.


-----Original Message-----
From: blindmath-bounces at nfbnet.org [mailto:blindmath-bounces at nfbnet.org] On
Behalf Of Haden Pike
Sent: Saturday, February 11, 2012 3:48 PM
To: blindmath at nfbnet.org
Subject: [Blindmath] graphics

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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