id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
11121,Invalid result of difference() for integral coordinates.,awulkiew,Barend Gehrels,"For polygons:

{{{
green = ""POLYGON((-8042 -1485,-8042 250,-8042 250,15943 254,15943 -1485,-8042 -1485))"",
blue = ""POLYGON((-7901 -1485,-7901 529,-7901 529, 15802 544, 15802 -1485, -7901 -1485))""
}}}

The result of difference(green, blue) and/or difference(blue, green) is invalid if the polygons use `int` coordinate type.

I think it may be related to get_turns/cart_intersect and ratios/fractions but it needs further investigation. I noticed that turns has wrong coordinates, always endpoints of segments are picked as if internally ratios were always truncated to 0.",Bugs,closed,Boost 1.58.0,geometry,Boost Development Trunk,Problem,fixed,"difference, integral, setops, get_turns",mkaravel