Release Notes for MECCA 2000 version 6.16.  2024-10-17


Fixed:
  1. raster_trace.tcl had a typo regarding where "potrace" will be run from
     (raster_trace.tcl).

  2. Beyound certain zoom level, boxes with background/inside and round
     corner(s) had round corners displayed incorrectly (m2kbin).


Changed/New:

  1. For mouse wheel scrolling, it is significantly faster to treat the current
     drawing window content as a bitmap, slide it opposite to the scrolling
     direction, then fill in only the new vacant area that's "scrolled in",
     with a hard clipping rectangle to limit the amount of drawing operation.

     However, this leads to an occasional one-line gap, caused by rounding-off
     based on the scaling factor (drawing dimension, zooming) in effect at the
     moment: MECCA components are in units of HOP (hundredth-of-point, 1/7230
     inch), whereas the screen is in integer pixels.

     There is no practical way to completely avoid this effect, without placing
     huge demand on memory usage on your computer.

     Instead, Alt-Click (Alt key pressed, along with either left or right mouse
     button click) is now added to "refresh the drawing window" (m2k, m2kbin,
     mouse.tcl).

     You can Alt-Click in the drawing window at any time, even during a dynamic
     draw (rubber-band line/arc/spling, or resizing a box): if Alt key is
     pressed, the click will not be taken as a positional click.

  2. The scrolling choice now appears in Window dialog as "Scroll by:", either
     by percentage of the drawing window, or by some number of pixels.  User's
     choice is saved into ~/.m2k.tcl; default is by 10% (m2kbin, window.tcl,
     m2kprocs.tcl).

  3. Update Tcl/Tk to 8.6.15 (tclsh8.6, wish8.6, libs/tcl8.6, libs/tk8.6,
     libtcl86.so.1, libtclstub86.a, libtk86.so.1, libtkstub86.a).