Fri, 05/05/2017 - 05:08
Forums:
Hello~I'm a beginner of Opencascade.
These days I have a problem about drawing curves in 3D space.
For example, if I want to draw a line with 50 points, TColgp_Array1OfPnt A(1 , 50) can be used.
Then with a loop,
for(int i = 0; i < 50; i++)
{
A.SetValue(i , gp_Pnt());
}
Handle(Geom_BSplineCurve) SPL1 = GeomAPI_PointsToBSpline(A,1,1);
That's the situation that I know how many points there.
But if I want to add points to array dynamically, for TColgp_Array1OfPnt A(1 , X), it means that I am not sure about how much X is.
How can I solve this problem?
Do you have any good idea? Thanks a lot! Hope you all have a nice day!
Sun, 05/07/2017 - 03:41
Instances of NCollection_Array1 (such as TColgp_Array1OfPnt) according to the documentation can not change size and must be instantiated with a known size at runtime. Off-hand I am not sure if OCCT provides a dynamic array. My suggestion would be to either wait until you do know what size you need (if possible) before creating the array, or just use a dynamic array structure like std::vector, incrementally add to that, and then create a TColgp_Array1OfPnt from its contents when you have all the points you need.
Mon, 05/08/2017 - 08:27
Hi~David:
Thanks for your reply. As your suggestion, I'm trying to use vector to solve the problem! Hope it will work~
Tue, 05/09/2017 - 20:19
Hello,
OCCT provides dynamic collection. It is called "NCollection_Vector".
qa qa