%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/enumerate.array {
    1 dict begin
    /a exch def
    [
      0 1 a length 1 sub {
          [ exch dup a exch get ]
      } for
    ]
    end
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def

/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def


% end included library code

/nearestvalidpoint {
    0 dict begin
    3 1 roll
    /y exch def
    /x exch def
    /minmhd -1 def
    -1 exch
    enumerate.array {
        aload pop
        /p exch def
        /i exch def
        p 0 get x eq p 1 get y eq or {
            /mhd p 0 get x sub abs p 1 get y sub abs add def
            minmhd -1 eq mhd minmhd lt or {
                /minmhd mhd def
                pop i
            } if
        } if
    } forall
    end
} bind def

(nearestvalidpoint) test.start
3 4 [[1 2] [3 1] [2 4] [2 3]] nearestvalidpoint 2 eq test
2 5 [[3 4] [2 3] [1 5] [2 5]] nearestvalidpoint 3 eq test
1 1 [[2 2] [3 3] [4 4]] nearestvalidpoint -1 eq test
0 0 [[0 1] [1 0] [0 2] [2 0]] nearestvalidpoint 0 eq test
5 5 [[5 6] [6 5] [5 4] [4 5]] nearestvalidpoint 0 eq test
test.end