Board index » cppbuilder » RichEdit's Text Length in pixels

2004-01-09 08:44:25 AM
cppbuilder6
Is there an accuarate way to calculate the length in pixels
of the text (n lines) in RichEdit for any font (any Font Name
and Font Size)
TIA
Rodolfo
 

"Rodolfo Frino - Macrosoft" < XXXX@XXXXX.COM >wrote in message
can do is calculate the beginning and ending offsets of the desired text,
translate the offsets to pixels (there are messages available for that), and
then query the difference in values.
Gambit
 

What do you mean by the text offset (or how do you measure it)?
Rodolfo
 

{smallsort}

"Rodolfo Frino - Macrosoft" < XXXX@XXXXX.COM >wrote in message
character in the text has an offset - the first character is 0, the next
character is 1, and so on to the end of the text. That offset can then be
translated into absolute pixel coordinates (and vice versa). There are also
messages available for determining the character offset of the beginnning of
individual lines in the text, and also to determine the lengths of thos
lines. By determining the beginning and ending offsets of the first and
last lines which you are interested in, you can then figure out how many
pixels those lines take up on the screen.
Gambit
 

"Remy Lebeau (TeamB)" < XXXX@XXXXX.COM >wrote in message
There are also
RichEdit1->Height = abs(factor*RichEdit1->Font->Height *
(RichEdit1->Lines->Count));
I added a factor to take into account the space between lines. Of course the
"factor"
is different for different fonts sizes and font types (Font names), which
makes it very difficult to
adjust. I have also assumed that all lines have the same height, which is
true in the my application.
Rodolfo
 

"Rodolfo Frino - Macrosoft" < XXXX@XXXXX.COM >wrote in message
following messages:
EM_POSFROMCHAR
EM_LINEFROMCHAR
EM_LINEINDEX
EM_LINELENGTH
Gambit
 

oki doki and thanks
"Computers don't die, they password away", Rodolfo
"Remy Lebeau (TeamB)" < XXXX@XXXXX.COM >wrote in message

"Rodolfo Frino - Macrosoft" < XXXX@XXXXX.COM >wrote in message
www.codeproject.com/richedit/richeditsize.asp
Sort a strange but worked for me.
/Pavel
 

Thank you Pavel, I will try that as soon as I can.
Rodolfo
"Pavel Vozenilek" < XXXX@XXXXX.COM >wrote in message