CGAL users discussion list

[David Keller <>]

Hello,

I'm encountering problems with the Arrangement_2 package for 
Bezier-curves. From the documentation it seems the failure has not to be 
expected (please give me a hint if I missed something). So I think it 
would be a good decision to either fix it or give a more detailed report 
for which input the code is supposed to work.

There are two scenarios for which errors occur. Both can be reproduced 
by calling  the example application in 
example/Arrangement_2/Bezier_curves.cpp.

TEST CASE 1:
-------------------

Input:

3
3  0 0  1 1  13/9 1
3  13/9 1  2 1  2 -7/8
3  2 -7/8  2 -2  0 3

Output:

B = {3  0 0  1 1  13/9 1}
B = {3  13/9 1  2 1  2 -7/8}
B = {3  2 -7/8  2 -2  0 3}
CGAL error: assertion violation!
Expr: intersection_pairs.size() == 1
File: 
/opt/CGAL-3.3.1/include/CGAL/Arr_traits_2/Bezier_bounding_rational_traits.h
Line: 247
Explanation:
terminate called after throwing an instance of 'CGAL::Assertion_exception'
 what():  CGAL ERROR: assertion violation!
Expr: intersection_pairs.size() == 1
File: 
/opt/CGAL-3.3.1/include/CGAL/Arr_traits_2/Bezier_bounding_rational_traits.h
Line: 247
Aborted

TEST CASE 2:
-------------------

Input:

2
3  0 0  8 2  0 4
3  4 0  0 2  4 4

Output:

B = {3  0 0  8 2  0 4}
B = {3  4 0  0 2  4 4}
CGAL error: assertion violation!
Expr: CGAL::compare(right[0].x(), right[1].x()) != EQUAL
File: 
/opt/CGAL-3.3.1/include/CGAL/Arr_traits_2/Bezier_bounding_rational_traits.h
Line: 378
Explanation:
terminate called after throwing an instance of 'CGAL::Assertion_exception'
 what():  CGAL ERROR: assertion violation!
Expr: CGAL::compare(right[0].x(), right[1].x()) != EQUAL
File: 
/opt/CGAL-3.3.1/include/CGAL/Arr_traits_2/Bezier_bounding_rational_traits.h
Line: 378
Aborted


Thanks and kind regards,
David Keller