Re: [fltk.development] FLTK '@' symbols question
Question: I want to verify that '@' symbols in labels (eg. @-) are only allowed at either *the very beginning* or *very end* of a string, or at both ends, and nothing else (ie. not in the middle of a string, or mixed into multiple lines). Another interesting thing about symbols I didn't know about @ symbols in labels, and I don't think is documented: The more lines in the string, the larger the symbol will be; the symbol is scaled to the size of all lines, and centered. Here comes some examples that use ascii art (view in a fixed width font!) If the label string is: @ Aaa\nBbb @ You'll get: /| Aaa |\ \| Bbb |/ ..and if the string has more lines, e.g. @ Aaa\nBbb\nCcc\nDdd @ ..then you'll get larger arrow symbols matching the height of all the lines: /| Aaa |\ / | Bbb | \ \ | Ccc | / \| Ddd |/ ..instead of what I was *expecting*, which would have been: | Aaa Bbb Ccc Ddd | This behavior of symbols automatically centering + scaling should really be documented too. I had no idea symbols worked this way until I looked closely at the side effects of fl_measure's code. ___ fltk-dev mailing list fltk-dev@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-dev
Re: [fltk.development] FLTK '@' symbols question
I'm working on fixing STR #2772 (removing extraneous code in fl_measure()) and need to understand in detail how we support '@' symbols in FLTK. Eek! That seems brave! (To me, at least!) Selex ES Ltd Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England Wales. Company no. 02426132 This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ___ fltk-dev mailing list fltk-dev@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-dev
Re: [fltk.development] FLTK '@' symbols question
Somewhat related, it would be nice if fl_add_symbol() would accept not only drawing functions but also images, even without additional scaling and rotations. In the symbol table there is an int flag field (at the moment this flag is used only with values 0/1 to indicate scalable and non-scalable symbols), other value could indicate that the pointer in the internal table is an image (or other object), not the function and have to be interpreted differently. This can be done by overloading fl_add_symbol() which would set appropriate flag. The reason for that is that it would simplify drawing icons for instance in menus. At the moment I am doing this by wrapping icon-drawing in symbol-like wrapping functions (using some templates to automate instantiation of wrapping functions). The problem with it is that for each image/icon you need to implement separate function wrapper. Having overloaded fl_add_symbol(const char * name, Fl_Image *, ...) could simplify that and allow drawing image as symbol in any label just by adding it to the table and using @ convention within labels. To have the symbol API more comprehensive (and for istance remove destructed images) it would require also to add a fl_remove_symbol() function. Alternative approach would be that for instance @ convention would accept something like @file:///my/shared/image.png My Label in which case the shared image (with proper size) would be instantiated and used automatically but in such a case there is a question when/where to keep track of caches (shared images and their the reference counts) as zombie caches could still be alive after eg label change or widget destruction. R. On 24/03/2013 05:22, Greg Ercolano wrote: I'm working on fixing STR #2772 (removing extraneous code in fl_measure()) and need to understand in detail how we support '@' symbols in FLTK. Question: I want to verify that '@' symbols in labels (eg. @-) are only allowed at either *the very beginning* or *very end* of a string, or at both ends, and nothing else (ie. not in the middle of a string, or mixed into multiple lines). So in other words, these are OK: @- Back Next @- @- He went that way @- @- Line one\nLine two\nLine three @- .and just about all other variations are not: Something @- different. This @- is @- a test. This is @-\na test ___ fltk-dev mailing list fltk-dev@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-dev
Re: [fltk.development] FLTK '@' symbols question [fl_add_symbol() RFE]
[Changing the subject a bit to avoid a thread jack] On 03/25/13 09:25, Roman Kantor wrote: Somewhat related, it would be nice if fl_add_symbol() would accept not only drawing functions but also images, even without additional scaling and rotations. In the symbol table there is an int flag field (at the moment this flag is used only with values 0/1 to indicate scalable and non-scalable symbols), other value could indicate that the pointer in the internal table is an image (or other object), not the function and have to be interpreted differently. This can be done by overloading fl_add_symbol() which would set appropriate flag. +1 from me -- sounds like a good approach, and I understand that even though the symbol draw function can draw images, this won't scale well when you have a lot of images (one func per image). Making additional fl_add_symbol()/fl_remove_symbol() methods to accept an image pointer and having those internally make use one of the unused bits in the integer bit flag sounds like a good approach. Alternative approach would be that for instance @ convention would accept something like @file:///my/shared/image.png My Label I prefer the image pointer approach for the reasons you mentioned, and just it's better for modularity to have the image class handle all the image related stuff. ___ fltk-dev mailing list fltk-dev@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-dev
[fltk.development] FLTK '@' symbols question
I'm working on fixing STR #2772 (removing extraneous code in fl_measure()) and need to understand in detail how we support '@' symbols in FLTK. Question: I want to verify that '@' symbols in labels (eg. @-) are only allowed at either *the very beginning* or *very end* of a string, or at both ends, and nothing else (ie. not in the middle of a string, or mixed into multiple lines). So in other words, these are OK: @- Back Next @- @- He went that way @- @- Line one\nLine two\nLine three @- .and just about all other variations are not: Something @- different. This @- is @- a test. This is @-\na test I don't think these restrictions are documented, or at least not in the Labels and Label Types section of: http://fltk.org/doc-1.3/common.html So I'd like to (a) add this info to those docs, and (b) implement fixes accordingly to fl_measure(). Even as fl_measure() reads now (with extraneous code), I don't think it's correctly calculating symbol sizes.. for instance the scaling feature (e.g. @+9-, @-9-, which are scaled arrows). ___ fltk-dev mailing list fltk-dev@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-dev
