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A Problem About Dynamic Add points into an Array

Kevin Chuang's picture
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!

David Phillips's picture

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.

Kevin Chuang's picture

Hi~David:

Thanks for your reply.  As your suggestion, I'm  trying to use vector to solve the problem! Hope it will work~  

qa qa's picture

Hello,

OCCT provides dynamic collection. It is called "NCollection_Vector".

qa qa