if { [array get Draw_Groups "TOPOLOGY Check commands"] == "" } {
    pload TOPTEST
    pload AISV
}
# To prevent loops limit to 10 minutes
cpulimit 600

if { [info exists imagedir] == 0 } {
   set imagedir .
}

if { [info exists test_image ] == 0 } {
   set test_image photo
}


#
#evaluate n points beetween u1 and u2 on the curve 2d c
#

proc val2d { c u1 u2 n } {

  dset du ($u2-$u1)/$n
  upvar $c cc

  set i 1
			
  for {dset u $u1} { [dval u] <= $u2} {dset u ($u1+$i*[dval du])} {
    2dcvalue cc u x y dx dy d2x d2y  ;
    global p_$i d1_$i d2_$i 
    point p_$i  x y;
    puts "u   = [dval u]"
    puts "p_$i   [dval x  ]  [dval y]"
    puts "d1_$i  [dval dx ]  [dval dy]";
    puts "d2_$i  [dval d2x]  [dval d2y]";
     
    copy p_$i .	;
      point d1_$i dx dy
      point d2_$i d2x d2y
    incr i 1	
  }
}

#
#evaluate n points beetween u1 and u2 on the curve 3d c
#
proc val3d { c u1 u2 n } {

  dset du ($u2-$u1)/$n
  upvar $c cc
  
  set i 1
		
  for {dset u $u1} { [dval u] <= $u2} {dset u (u+[dval du])} {
    cvalue cc u x y z dx dy dz d2x d2y d2z ; 
    point p_$i  x y z;
    puts "u   = [dval u]"
    puts "p_$i  [dval x  ] [dval y  ] [dval z]";
    puts "d1_$i [dval dx ] [dval dy ] [dval dz]";    
    puts "d2_$i [dval d2x] [dval d2y] [dval d2z]";	
    copy p_$i .	;
      point d1_$i dx  dy  dz
      point d2_$i d2x d2y d2z
    incr i	
  }
}

proc compare {r1 r2 tol} {
	if {$r1 - $r2  >= $tol} {
		puts "Error : evalution" 
	}
	if {$r2 - $r1  >= $tol} {
		puts "Error : evalution" 
	}
} 

proc comparepnt2d {p1 p2 tol} {
	upvar $p1 pp1
	upvar $p2 pp2
	coord pp1 x1 y1
	coord pp2 x2 y2
	compare [dval x1] [dval x2] $tol
	compare [dval y1] [dval y2] $tol
}

proc comparepnt3d {p1 p2 tol} {
	upvar $p1 pp1
	upvar $p2 pp2
	coord pp1 x1 y1 z1
	coord pp2 x2 y2 z2
	compare [dval x1] [dval x2] $tol
	compare [dval y1] [dval y2] $tol
	compare [dval z1] [dval z2] $tol
}