[ggt-devel] using PyGMTL and C++ exposed to Python that use PyGMTL types?

[Alexis H. Rivera-R. <ahr...@ya...>]

Hi, 

I'm trying to expose my own class that uses gmtl
objects.   

This is an example:

struct Test
{
	gmtl::Vec3d x;
	gmtl::Point3d y;
	Test()
		: x(0,0,0),y(0,0,0) {}
	Test(const Test &other)
		: x(other.x),
		y(other.y){}

	Test& operator=(const Test& other)
	{
		if (this==&other)
			return *this;

		x = other.x;
		y = other.y;
	}	
};

Im exposing the class like this:

 class_< Test >("Test", init<  >())
        .def(init< const Test& >())
        .def_readwrite("x", &Test::x)
        .def_readwrite("y", &Test::y)  	
    ;

But this fails:
>>> import gmtl
>>> from PyStatATA import *
>>> test = Test()
>>> test.x = gmtl.Vec3d(0,0,1)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
Boost.Python.ArgumentError: Python argument types in
    None.None(Test, Vec3d)
did not match C++ signature:
    None(struct Test {lvalue}, class
gmtl::Vec<double,3>)
>>> test.y = gmtl.Point3d(0,0,1)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
Boost.Python.ArgumentError: Python argument types in
    None.None(Test, Point3d)
did not match C++ signature:
    None(struct Test {lvalue}, class
gmtl::Point<double,3>)
>>> my = test.y
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: No Python class registered for C++ class
class gmtl::Point<double,3>
>>> mx = test.x
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: No Python class registered for C++ class
class gmtl::Vec<double,3>

I'm assuming somehow, I need to define converters from
the gmtl types to python and viceversa.  But, it seems
that this has probably been done in your bindings. 
Can you suggest me a way of letting python know that
the gtml types have already being defined?

Has anybody done something like this before?

Thanks,
Alexis

Programming Tutorial:
In Python: To do this, do this
In Perl: To do this, do this or this or this or this...
In C: To do this, do this, but be careful
In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this


		
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