[racket] display problem

On Apr 5, 2012, at 1:39 PM, Roelof Wobben wrote:

> Op 5-4-2012 19:28, Danny Yoo schreef:
>> Can you get the position where the cursor should start by
>> taking the image for the left side text, and take its width?
>> 
> ...
> I start with this :
> 
> aaaaa|
> 
> now someone press 3 times the left key.
> So I have  aa/aaa
> How can I know where the cursor is now.
> Or can I do  width - 3 times 11 ?

You could do that, but it's not guaranteed to give you the right answer, because not all characters in a font are necessarily the same width.  How about (as Danny suggested) making an image of the left side text, and taking its width?


Stephen Bloch
sbloch at adelphi.edu