id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5954	distance_pythagoras skips sqrt() step	Mateusz Loskot	Barend Gehrels	"A problem with [http://lists.osgeo.org/pipermail/ggl/2011-September/001533.html Polygon Douglas–Peucker simplification] results have been reported.

There seems to be a bug in calculation of distance using Pythagoras Theorem. The problem is that the distance calculation is somehow omitting call to sqrt() leading to incomplete results.

It may be a problem with dispatching and execution execution paths in distance_pythagoras.hpp, so this part needs to be thoroughly reviewed.

Meanwhile, the patch attached provides a quick fix. The fix solves the reported problem, so the Boost.Geometry generates expected results. Also, the posted test case has been checked using GEOS and the patched distance_pythagoras generates results consistent with those obtained from GEOS. Means, the fix seems to be correct.

But, it causes number of unit test failures, so I decided to not to commit it this fix.

Barend, please get in touch when you will have a moment."	Bugs	closed	To Be Determined	geometry	Boost Development Trunk	Problem	fixed	pythagoras,geos,douglas,peucker,algorithm