OCCT

puts "========"
puts "OCC311"
puts "========"

restore [locate_data_file OCC311.draw] c 
####       checkshape c  # - not a topological shape

set ufirst 1e-7
set ulast  6.2831854071795897

segment c ${ufirst} ${ulast}

set dumpc [dump c]

set list [split ${dumpc} "\n\t"]
set listLength [llength ${list}]
if { ${listLength} < 25 } {
    puts "OCC311 - Error : listLength= ${listLength}"
}

regexp { +Degree +([-0-9.+eE]+), +([-0-9.+eE]+) +Poles, +([-0-9.+eE]+)  +Knots} $dumpc full DegreeNumber PolesNumber KnotsNumber

set Knots [regexp -all -inline { +([-0-9.+eE]+ +: +[-0-9.+eE]+ +[-0-9.+eE]+)} $dumpc]
regexp { *[-0-9.+eE]+ +: +([-0-9.+eE]+) +[-0-9.+eE]+} [lindex $Knots 1] full FirstKnot 
regexp { *[-0-9.+eE]+ +: +([-0-9.+eE]+) +[-0-9.+eE]+} [lindex $Knots [llength $Knots]-1] full LastKnot 

set delta_first [expr abs(${FirstKnot} - ${ufirst}) / ${ufirst} * 100]
set delta_last  [expr abs(${LastKnot} - ${ulast}) / ${ulast} * 100]

set maxdelta 0.01

puts "FirstKnot = ${FirstKnot}"
puts "LastKnot  = ${LastKnot}"

if { ${delta_first} > ${maxdelta} } {
    puts "OCC311 - Error : delta_first = ${delta_first}"
}
if { ${delta_last} > ${maxdelta} } {
    puts "OCC311 - Error : delta_last = ${delta_last}"
}

if { ${delta_first} <= ${maxdelta} && ${delta_last} <= ${maxdelta} } {
   puts "OCC311: OK"
}

checkview -display result -2d -path ${imagedir}/${test_image}.png