[George Peter Staplin]: Oct 29, 2005 - Megapkg is my largest project so far.  It contains a lot of C and Tcl code that is evolving.

The current list of (useful) Tcl/Tk extensions is:

    * pwm.so (used by [Whim])
    * tgext.so (used by [Whim] for some applets.  It's also available eventually as a C API via tg.so.)
    * structure.so (see [megapkg structure extension].  This is used by some widgets, and IIRC a tgext.so demo.)
    * gui.so (general drawing functions.  It's used less now that I have tgext.so)
    * pngext.so (reading/display works.  write is a work-in-progress. Note: not based on the photo image layer.)
    * jpegext.so (reading/display works.  write isn't even started.  Note: not based on the photo image layer.)
    * sys.so (used for applet [IPC] in [Whim])
   
'''Megapkg''' has a radical source tree layout (by some standards).  All *.c files are generated with [Fed Builder].  There is only one file to compile ${Ext}_Init.c per extension.  The ${Ext}_Init.c file for the particular extension #includes a header file.  The header file defines structures, and #includes many C source files (usually).  2 Tcl scripts are used to generate prototypes, and includes automatically.

'''TG/tgext.so''' or Terrific Graphics now uses XDBE and XShm (for performance) if they are available.  There are still many changes I want to make as TG evolves.  See the csrc/tg/tgext/tests directory for some Tcl examples that use tgext.so.

Current tgext.so features include:
    * Rotation of a drawing by any angle (with smooth lossless 90 degree increment rotations)
    * Full alpha blending of drawings (0-255)
    * Fast gradient drawing (horizontal and vertical)
    * Copy/Paste (easier image buffering essentially)
    * Scaling (to an exact width/height and by width/height ratios such as 0.7 (to shrink))
    * Canvas Plugin (tgext.so extends the Tk [canvas] with a new item type called "tg".  This is used in Whim for several applets.)
    * Text Drawing (albeit with some bugs with alpha transparency setting (soon to be fixed))
    * Drawing types (typical items such as rectangles, polygons, lines)
    * Pen (a pen is moved around to position the next drawing or manipulation.  In some cases this reduces the complexity.)
    * Drawing duplication (almost like a drawing fork()) 
    * Repeating of Tk images (repeat a Tk image n times over a range)

The latest tarballs are here:
http://www.xmission.com/~georgeps/implementation/software/megapkg

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