[Blindmath] graphics

[Richard Baldwin]

I'm assuming that you are blind. If not, then just draw it and measure it.

Here are the instructions for Windows Vista Pro. The procedure for other
versions of Windows should be similar.

1. Open the Control Panel.
2. Select Personalization
3. Select Display Settings
4. Work your way down to a slider labeled Resolution: It is also labeled
Low on the left end and High on the right end.

If you move that slider, the resolution of your monitor will be displayed
below the slider (1920 by 1080 pixels for example.) Hopefully your screen
reader will speak that information.

Physically measure the screen area on your monitor and do the arithmetic to
determine the resolution in pixels per inch or pixels per cm, whichever you
prefer.

Dick Baldwin


On Sat, Feb 11, 2012 at 5:24 PM, Michael Whapples <mwhapples at aim.com> wrote:

> As mentioned by someone else, the answer of what size it is depends on
> what display is being used as they can have different resolutions and
> people may not have their monitor set to the native resolution. Also it is
> worth noting that normally the higher resolution monitors are larger
> monitors anyway. You probably cannot guarantee what physical size something
> will have by defining the dimensions in pixels, however probably choosing
> something reasonable on yur system probably in most cases will give
> reasonable sizes for others.
>
> It may also be worth considering what is a reasonable size? I don't know
> if the operating system suppliers have guidelines (I know Apple do have UI
> guidelines for developers but I don't know if that includes recommendations
> on sizes for different types of controls). Another source of what might be
> reasonable, look at a few programming tutorials for the UI toolkit you will
> be using and see what is commonly used for different types of controls.
>
> Michael Whapples
>
> -----Original Message----- From: Haden Pike
> Sent: Saturday, February 11, 2012 8:47 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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-- 
Richard G. Baldwin (Dick Baldwin)
Home of Baldwin's on-line Java Tutorials
http://www.DickBaldwin.com

Professor of Computer Information Technology
Austin Community College
(512) 223-4758
mailto:Baldwin at DickBaldwin.com
http://www.austincc.edu/baldwin/