[Therion] A wtherion update

[Tarquin Wilton-Jones]

Some great changes since I last saw it! The response is really fast.

A few things that have thrown me off, all of which are because the work 
is not finished, so please take them only as a "it would be nice to keep 
this in mind for the future".

Bézier curves are very limited. I cannot make an unbalanced curve point 
with a long smoothing arm on one side and short on the other (something 
I do all the time). I also cannot make the points have arms pointing in 
different directions than opposite each other (something else I have had 
to do a number of times, untick the "smooth" box for a line point in 
XTherion).

Ending Bézier curves is not obvious. Esc does nothing. Very few keyboard 
shortcuts seem to exist.

Undo is not helpful for points within a line. It just undoes the whole 
line. I clicked on a control point in a Bézier curve thinking it might 
give me a menu to alter the drag handles, but instead it deleted the 
point. I did not expect that and definitely did not want it. No way to 
get it back that I could find. XTherion may occasionally screw up its 
undo stack, but the undo functionality there is superb, because it seems 
to remember every little thing that you did (until it eventually screws 
up and throws an error).

Create a Bézier line, right click and use other-bezier.menu.finish to 
end it. Click to start a new line. Ctrl+Z and *both* lines disappear.

It doesn't seem to snap points to each other, or if it does, it doesn't 
have any way to show that it did. In XTherion, you can make lines share 
the same point, so they are guaranteed to be warped together, and not 
produce tiny overlaps. You can also move individual points if you got 
them wrong, and make them snap to each other.

It is not obvious that you can zoom (Ctrl+mousewheel). Some kind of zoom 
indicator would be good.

Line thickness is preset. You cannot set what the rendering scale will 
be, which means it looks more cluttered than it will be when rendered.

In future, it would be nice to be able to set the symbol set, especially 
for things like ceiling steps which are reversed in some of them, which 
makes it very hard to know which direction they will end up facing in 
the final render.

I assume that all of these are just because it's a work in progress, and 
the progress is good enough that you're getting this kind of report :)