Make line intersection computation more robust #989
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Changes the computation of line intersections to use DoubleDouble arithmetic, for improved accuracy. This uses the existing
CGAlgorithmsDD.intersectionimplementation.CGAlgorithmsDD.intersectionis significantly slower than the original FP implementation. But since in typically use intersection calculation is a small fraction of overall processing, this seems to have almost no practical performance impact.This does change the results of some intersection cases by a small amount. A few unit tests had to be changed to reflect this.
Fixes #396.
Fixes #270
See also libgeos/geos#933 for another case which is fixed by this change.