[ptx] automatch - some progress picking control points

[Pablo d'Angelo]

On Wed, 14 Jan 2004, Bruno Postle wrote:

very nice!

> I've done some more tinkering with the automatch prototype for
> generating control points.

I have started to write a c++ version of it. I'm using a slightly different
way of creating candidate triangles:

1. I use a distance matrix d (as known from maps etc.)
2. search similar first lines
3. search similar second lines that join (just examining 1 row of d,
   and checking if the resulting third line is similar to the searched
   triangle(simple lookup))

Unfortunately I have some bugs somewhere, so I haven't checked it in yet.
It creates lots of bogus points.

ciao
  Pablo
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