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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
If the font size is fixed then just compute:

row = (y-verticaloffset)/characterheight

column = (x-horizontaloffset)/characterwidth
Post 05 Jul 2010, 00:17
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Teehee



Joined: 05 Aug 2009
Posts: 570
Location: Brazil
Teehee
whats x and y? if its width and height of view:
Code:
;32*8 = 256 = X
;4*8 = 32 = horizontaloffset
;8 = characterwidth
(256-32)/8 = 28 ; column
;Y:
(192-48)/16= 9 ; row    

?
something is wrong.

to get row and col is easy the problem is to map that to char id.

The [t] char:
Code:
the book\
is on\
the [t]able    

has same row and col of:
Code:
the book\
is on blablablabla\
the [t]able    

however, they have differents char ids.
Post 05 Jul 2010, 01:07
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
What do you mean by "char id". Do you mean the offset into some memory buffer?

If your memory buffer is the raw text with CR and LF etc. then you can scan and count the LFs to find the row. And then move forward to find the column. Make sure your column counter does not pass a CR and move into the next line.
Post 05 Jul 2010, 02:31
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Teehee



Joined: 05 Aug 2009
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Location: Brazil
Teehee
yep, offset.

I will need to count? there is not a math way to do that? Sad
Post 05 Jul 2010, 11:03
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
Well if your text buffer is free form with CR/LF in random places then no simple mathematics can help you.
Post 05 Jul 2010, 13:35
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Teehee



Joined: 05 Aug 2009
Posts: 570
Location: Brazil
Teehee
i was wondering about make each line with 128 characters in max, so i can calc each position easily. However i don't know if its a good limitation and it will take too many memory space. So i think the way is to count. (although this seems slow).
Post 05 Jul 2010, 13:44
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
There are a few things you can do to enhance it.

Starting with your basic linear buffer you can create a table of line lengths for fast line indexing. Of course it requires you to update the index also when updating the text.

However, perhaps the basic rule is appropriate here. Get it working, then get it fast. If, once it is working, you find that the speed is a non-issue then forget about making it faster and instead make more code for other things.
Post 05 Jul 2010, 13:52
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