Sorry another problem. Mouse Buttons.

**wysota** · 20th February 2006, 19:37

Probably because you are letting the buttons go to trigger the event

Try keeping the right button pressed while releasing the left one (after causing LMB to start the drag).

**Zephro** · 20th February 2006, 19:43

Aha, that works. Ta very much.

Bit counter intuitive, but it's just to demonstrate a presentation idea about trees so it's never going to be really used.

Also if you happen to know where to find the Fructherman-Reingold algorithm or Kamada-Kawai anywhere let me know! I can only find vague descriptions of the algorithms and I need something to space out the different nodes properly.

**wysota** · 20th February 2006, 19:49

Originally Posted by Zephro

Aha, that works. Ta very much.

Bit counter intuitive, but it's just to demonstrate a presentation idea about trees so it's never going to be really used.

You might want to use "drop actions" instead. There are three such actions -- copy, move and link. You can use them for whatever you want (with copy being the default and two others being triggered by holding ctrl or alt). It might prove simpler.

**orb9** · 23rd February 2006, 10:15

Originally Posted by Zephro

Also if you happen to know where to find the Fructherman-Reingold algorithm or Kamada-Kawai anywhere let me know! I can only find vague descriptions of the algorithms and I need something to space out the different nodes properly.

They are available in the boost library. But prepare for a template ride:
http://www.boost.org/libs/graph/doc/
I already tried them and did not manage to parameterize them correctly so my results where somehow useless. Do you know some good documentation for these algorithms?

**Zephro** · 24th February 2006, 16:08

No idea, I just want a simple description, but detailed enough, so I can implement it myself rather than dealing with templates.

Especially as my data structures I'm working on probably won't work very well. Â¬_Â¬