optimization-pulltight45degree

[Djzhan0207]

This is an optimization for pulltight-45degree algorithm.
It can improve the performance when the PCB is very dense and the mode is under 45 °.

[Djzhan0207]

Freerouting uses too much memory is mainly because its searching queue has too many elements。
The endless loop is because Simplex.java 's intersection function has a endless loop，it occurs when
a rectangle trying to intersect with an irregular borderline shape.Improving this algorithm or when this situations happens，
stoping it and restarting router cound help。

[L1uTongweiNewAccount]

Thank you, now I will use your code to solve my routing.

[andrasfuchs]

@L1uTongweiNewAccount Did you have the chance to test this modification? Does it work as you expected?

[andrasfuchs]

I see that you commented out a few lines. It would be preferable if you completely removed them. Could you do that before I accept this PR?

[andrasfuchs]

Interestingly when I run the router with this PR it gets stuck at pass 8:

I used the following parameters:
-de .\tests\Issue297-myboard.dsn -do .\tests\Issue297-myboard.ses

This PR is still an improvement in this case, because the original code is stuck at the first pass.

[Djzhan0207]

Stuck is mainly because the endless loop mentioned above. This PR is just a time saver for dense PCB.
You can remove the code's comment.
I think 90 router with 45 pulltight could route more fast.