re. Positioning text within a circle
- From: "Ian D. Nichols" <inich@xxxxxxxxxx>
- To: <program-l@xxxxxxxxxxxxx>, <programmingblind@xxxxxxxxxxxxx>
- Date: Sun, 8 Feb 2009 23:11:47 -0500
Hello Listers,
Thanks to those from Program-l and ProgrammingBlind who replied to my question.
I apologize that my initial post did not make it clear that the text did not
need to be centred in the circle, and did not let you know that I am using a
Borland C++ command line compiler in the Windows environment.
thanks to Ken, David, Everett and Sina, whose ideas, although expressed a
little differently, boiled down to essentially the same thing:
Take any point in the bounding square of the circle.
form a right angled triangle with that point and the centre of the circle as
its hypotenuse,
and the 3rd point on the vertical axis through the centre with the same y value
as the original point.
Calculate the length of the hypotenuse using good old Pythagorus.
If it is greater than the radius, the point is outside the circle.
I think I owe you this explanation:
My project is a stand-alone Win32 program that enables the user to print text
onto a blank CD or DVD label. Such a label is, of course, round, hence the
circle. My program draws a circle on the screen, and has a function to add
text to the screen. That would enable a sighted user to see whether or not the
text was within it. I needed the procedure we have been discussing so that the
program could alert a blind or visually-impaired user that at least part of the
text was on the non-printable part of the label sheet.
the method suggested is far simpler and more reliabel than the complicated
scenario I had imagined, which would have had each corner of the text rectangle
compared with numerous points on the circumference of the circle.
If anyone is interested in checking out my program, please contact me
privately, and I'll send you a .zip file containing the executable, a
documentation file, a Readme.txt file containing installation instructions, and
a set of JAWS configuration files that I have developped for it. The program
is in working order - I have used it to produce several CD labels - but it
still needs further refinement. Over the next few days I will code and test
this new procedure.
Again, many thanks to you all. Once again these lists have proved their great
value.
All the best,
Ian
Ian D. Nichols,
toronto, Canada
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