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osfameron (3135)

osfameron
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http://greenokapi.net/blog/

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Journal of osfameron (3135)

Thursday July 31, 2003
05:49 AM

Text art toolkit

[ #13804 ]
I'm at the vaguely planning stage of creating an ascii art toolkit for Perl. I was thinking of Text::YAAAGH for Yet Another Ascii Art Graphics H???? but there's surprisingly little competition. The [cpan://Text::Graphics] module appears to be the only one in fact, though there are some modules to do flowcharts, bar-graphs, tables and the like.

The features I'd like include

  • assemble text art from superimposed layers with transparency.
  • nice library of transforms to apply recursively on layers (intelligent rotate, for example, which does for example tr/db/pq/ for rot180, and automatically moves sub-layers).
  • easy to extend to add arbitrary transforms
  • nice hooks into figlet, boxes, and the Ascii graphing/modules
  • hooks into an improved version of my Text::JavE module to be able to easily reuse clipart.
  • collision detection for ascii sprites
  • Embed animations (possibly imported from .jmov files using Text::JavE)
  • ... and of course the previous 2 items imply that this would use something like POE as an event framework. (And I need an excuse to get my head around POE).
  • ...simple rules to make animation effects based on characters already present in other layers (effectively a 2D Cellular Automata machine!)
  • ... and of course a point and click interface to the text art widgets would be lovely. There's a POE::Wheel::Curses module, which would be very cool, except Win32 doesn't really support Curses. (I think dada wanted to do a Win32::Console write of Curses, which would be nice).

I spent some time on the way back from YAPC::EU thinking about this. It's surprisingly difficult to decide how to represent the layers. I started off assuming that each character would have

  • The ascii character
  • Background colour
  • Foreground colour
  • a bit vector of various internal and user-defined flags (mask, 'hot' for collision detection etc.)

Now I'm going with the simple version of an array of strings, with the mask represented by an appropriate (e.g. non-ascii character) This loses flexibility, but makes everything else much simpler. I think every layer will have a hash of properties, so additional out of band information could be stored if required. I'm a little worried that by refusing to design colour in from the beginning, it will be very hard to add in later if needed.

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