puts "========"
puts "OCC29712"
puts "========"
puts ""
#################################################
# Extrema algorithm raises exception
#################################################

# Curves c1 and c2 are concentric circles.
# However, they are bounded (trimmed) curves
# and are shifted relatively to each other.
# So, there are two parallel arcs with distance 150
# and one pair of points with distance 50. Extrema 
# algorithm must return minimal distance (50) and
# not infinite solution

set ExpDist 50.0

circle c1 0 0 0 0 0 1 100
circle c2 0 0 0 0 0 1 50
trim c1 c1 0 3
trim c2 c2 -2.0 0.0

foreach a [ directory ext_* ] { unset $a }
if { [regexp {Infinite} [extrema c1 c2]] } {
  puts "Error: Extrema (c1 c2) returned infinite number of solution"
}

if { [llength [ directory ext_* ] ] != 1 } {
  puts "Error: Wrong number of solutions (c1 c2)"
}

checklength ext_1 -l $ExpDist

foreach a [ directory ext_* ] { unset $a }
if { [regexp {Infinite} [extrema c2 c1]] } {
  puts "Error: Extrema (c2 c1) returned infinite number of solution"
}

if { [llength [ directory ext_* ] ] != 1 } {
  puts "Error: Wrong number of solutions (c2 c1)"
}

checklength ext_1 -l $ExpDist