blender-archive/source/blender/python/api2_2x/Constraint.c

/*
 * $Id$
 *
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * This is a new part of Blender.
 *
 * Contributor(s): Joseph Gilbert, Ken Hughes
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */

#include "Constraint.h" /*This must come first*/

#include "DNA_object_types.h"
#include "DNA_effect_types.h"
#include "DNA_vec_types.h"
#include "DNA_curve_types.h"

#include "BKE_main.h"
#include "BKE_global.h"
#include "BKE_library.h"
#include "BKE_action.h"
#include "BKE_armature.h"
#include "BLI_blenlib.h"
#include "BIF_editconstraint.h"
#include "BSE_editipo.h"
#include "MEM_guardedalloc.h"
#include "butspace.h"
#include "blendef.h"
#include "mydevice.h"

#include "Object.h"
#include "NLA.h"
#include "gen_utils.h"

enum constraint_constants {
	EXPP_CONSTR_XROT = 0,
	EXPP_CONSTR_YROT = 1,
	EXPP_CONSTR_ZROT = 2,

	EXPP_CONSTR_MAXX = TRACK_X,
	EXPP_CONSTR_MAXY = TRACK_Y,
	EXPP_CONSTR_MAXZ = TRACK_Z,
	EXPP_CONSTR_MINX = TRACK_nX,
	EXPP_CONSTR_MINY = TRACK_nY,
	EXPP_CONSTR_MINZ = TRACK_nZ,

	EXPP_CONSTR_TARGET = 100,
	EXPP_CONSTR_TOLERANCE,
	EXPP_CONSTR_ITERATIONS,
	EXPP_CONSTR_BONE,
	EXPP_CONSTR_CHAINLEN,
	EXPP_CONSTR_POSWEIGHT,
	EXPP_CONSTR_ROTWEIGHT,
	EXPP_CONSTR_ROTATE,
	EXPP_CONSTR_USETIP,

	EXPP_CONSTR_ACTION,
	EXPP_CONSTR_LOCAL,
	EXPP_CONSTR_START,
	EXPP_CONSTR_END,
	EXPP_CONSTR_MIN,
	EXPP_CONSTR_MAX,
	EXPP_CONSTR_KEYON,

	EXPP_CONSTR_TRACK,
	EXPP_CONSTR_UP,

	EXPP_CONSTR_RESTLENGTH,
	EXPP_CONSTR_VOLVARIATION,
	EXPP_CONSTR_VOLUMEMODE,
	EXPP_CONSTR_PLANE,

	EXPP_CONSTR_FOLLOW,
	EXPP_CONSTR_OFFSET,
	EXPP_CONSTR_FORWARD,

	EXPP_CONSTR_LOCK,

	EXPP_CONSTR_MINMAX,
	EXPP_CONSTR_STICKY,

	EXPP_CONSTR_COPY,
};

/*****************************************************************************/
/* Python BPy_Constraint methods declarations:                               */
/*****************************************************************************/
static PyObject *Constraint_getName( BPy_Constraint * self );
static int Constraint_setName( BPy_Constraint * self, PyObject *arg );
static PyObject *Constraint_getType( BPy_Constraint * self );
static PyObject *Constraint_getInfluence( BPy_Constraint * self );
static int Constraint_setInfluence( BPy_Constraint * self, PyObject * arg );

static PyObject *Constraint_moveUp( BPy_Constraint * self );
static PyObject *Constraint_moveDown( BPy_Constraint * self );
static PyObject *Constraint_insertKey( BPy_Constraint * self, PyObject * arg );

static PyObject *Constraint_getData( BPy_Constraint * self, PyObject * key );
static int Constraint_setData( BPy_Constraint * self, PyObject * key, 
		PyObject * value );

/*****************************************************************************/
/* Python BPy_Constraint methods table:                                      */
/*****************************************************************************/
static PyMethodDef BPy_Constraint_methods[] = {
	/* name, method, flags, doc */
	{"up", ( PyCFunction ) Constraint_moveUp, METH_NOARGS,
	 "Move constraint up in stack"},
	{"down", ( PyCFunction ) Constraint_moveDown, METH_NOARGS,
	 "Move constraint down in stack"},
	{"insertKey", ( PyCFunction ) Constraint_insertKey, METH_VARARGS,
	 "Insert influence keyframe for constraint"},
	{NULL, NULL, 0, NULL}
};

/*****************************************************************************/
/* Python BPy_Constraint attributes get/set structure:                       */
/*****************************************************************************/
static PyGetSetDef BPy_Constraint_getseters[] = {
	{"name",
	(getter)Constraint_getName, (setter)Constraint_setName,
	 "Constraint name", NULL},
	{"type",
	(getter)Constraint_getType, (setter)NULL,
	 "Constraint type (read only)", NULL},
	{"influence",
	(getter)Constraint_getInfluence, (setter)Constraint_setInfluence,
	 "Constraint influence", NULL},
	{NULL,NULL,NULL,NULL,NULL}  /* Sentinel */
};

/*****************************************************************************/
/* Python Constraint_Type Mapping Methods table:                             */
/*****************************************************************************/
static PyMappingMethods Constraint_as_mapping = {
	NULL,                               /* mp_length        */
	( binaryfunc ) Constraint_getData,	/* mp_subscript     */
	( objobjargproc ) Constraint_setData,	/* mp_ass_subscript */
};

/*****************************************************************************/
/* Python Constraint_Type callback function prototypes:                      */
/*****************************************************************************/
static void Constraint_dealloc( BPy_Constraint * self );
static PyObject *Constraint_repr( BPy_Constraint * self );

/*****************************************************************************/
/* Python Constraint_Type structure definition:                              */
/*****************************************************************************/
PyTypeObject Constraint_Type = {
	PyObject_HEAD_INIT( NULL )  /* required py macro */
	0,                          /* ob_size */
	/*  For printing, in format "<module>.<name>" */
	"Blender Constraint",         /* char *tp_name; */
	sizeof( BPy_Constraint ),     /* int tp_basicsize; */
	0,                          /* tp_itemsize;  For allocation */

	/* Methods to implement standard operations */

	( destructor ) Constraint_dealloc,/* destructor tp_dealloc; */
	NULL,                       /* printfunc tp_print; */
	NULL,                       /* getattrfunc tp_getattr; */
	NULL,                       /* setattrfunc tp_setattr; */
	NULL,                       /* cmpfunc tp_compare; */
	( reprfunc ) Constraint_repr, /* reprfunc tp_repr; */

	/* Method suites for standard classes */

	NULL,                       /* PyNumberMethods *tp_as_number; */
	NULL,                       /* PySequenceMethods *tp_as_sequence; */
	&Constraint_as_mapping,       /* PyMappingMethods *tp_as_mapping; */

	/* More standard operations (here for binary compatibility) */

	NULL,                       /* hashfunc tp_hash; */
	NULL,                       /* ternaryfunc tp_call; */
	NULL,                       /* reprfunc tp_str; */
	NULL,                       /* getattrofunc tp_getattro; */
	NULL,                       /* setattrofunc tp_setattro; */

	/* Functions to access object as input/output buffer */
	NULL,                       /* PyBufferProcs *tp_as_buffer; */

  /*** Flags to define presence of optional/expanded features ***/
	Py_TPFLAGS_DEFAULT,         /* long tp_flags; */

	NULL,                       /*  char *tp_doc;  Documentation string */
  /*** Assigned meaning in release 2.0 ***/
	/* call function for all accessible objects */
	NULL,                       /* traverseproc tp_traverse; */

	/* delete references to contained objects */
	NULL,                       /* inquiry tp_clear; */

  /***  Assigned meaning in release 2.1 ***/
  /*** rich comparisons ***/
	NULL,                       /* richcmpfunc tp_richcompare; */

  /***  weak reference enabler ***/
	0,                          /* long tp_weaklistoffset; */

  /*** Added in release 2.2 ***/
	/*   Iterators */
	NULL,                       /* getiterfunc tp_iter; */
	NULL,                       /* iternextfunc tp_iternext; */

  /*** Attribute descriptor and subclassing stuff ***/
	BPy_Constraint_methods,       /* struct PyMethodDef *tp_methods; */
	NULL,                       /* struct PyMemberDef *tp_members; */
	BPy_Constraint_getseters,     /* struct PyGetSetDef *tp_getset; */
	NULL,                       /* struct _typeobject *tp_base; */
	NULL,                       /* PyObject *tp_dict; */
	NULL,                       /* descrgetfunc tp_descr_get; */
	NULL,                       /* descrsetfunc tp_descr_set; */
	0,                          /* long tp_dictoffset; */
	NULL,                       /* initproc tp_init; */
	NULL,                       /* allocfunc tp_alloc; */
	NULL,                       /* newfunc tp_new; */
	/*  Low-level free-memory routine */
	NULL,                       /* freefunc tp_free;  */
	/* For PyObject_IS_GC */
	NULL,                       /* inquiry tp_is_gc;  */
	NULL,                       /* PyObject *tp_bases; */
	/* method resolution order */
	NULL,                       /* PyObject *tp_mro;  */
	NULL,                       /* PyObject *tp_cache; */
	NULL,                       /* PyObject *tp_subclasses; */
	NULL,                       /* PyObject *tp_weaklist; */
	NULL
};

/*****************************************************************************/
/* Python BPy_Constraint methods:                                            */
/*****************************************************************************/

/*
 * return the name of this constraint
 */

static PyObject *Constraint_getName( BPy_Constraint * self )
{
	if( !self->con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint has been removed!" );
	
	return PyString_FromString( self->con->name );
}

/*
 * set the name of this constraint
 */

static int Constraint_setName( BPy_Constraint * self, PyObject * attr )
{
	char *name = PyString_AsString( attr );
	if( !name )
		return EXPP_ReturnIntError( PyExc_TypeError, "expected string arg" );

	if( !self->con )
		return EXPP_ReturnIntError( PyExc_RuntimeError,
				"This constraint has been removed!" );
	
	BLI_strncpy( self->con->name, name, sizeof( self->con->name ) );

	return 0;
}

/*
 * return the influence of this constraint
 */

static PyObject *Constraint_getInfluence( BPy_Constraint * self )
{
	if( !self->con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint has been removed!" );
	
	return PyFloat_FromDouble( (double)self->con->enforce );
}

/*
 * set the influence of this constraint
 */

static int Constraint_setInfluence( BPy_Constraint * self, PyObject * value )
{
	if( !self->con )
		return EXPP_ReturnIntError( PyExc_RuntimeError,
				"This constraint has been removed!" );

	return EXPP_setFloatClamped( value, &self->con->enforce, 0.0, 1.0 );
}

/*
 * return the type of this constraint
 */

static PyObject *Constraint_getType( BPy_Constraint * self )
{
	if( !self->con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint has been removed!" );
	
	return PyInt_FromLong( self->con->type );
}

/*
 * move the constraint up in the stack
 */


static PyObject *Constraint_moveUp( BPy_Constraint * self )
{
	if( !self->con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint has been removed!" );
	
	const_moveUp( self->obj, self->con );
	Py_RETURN_NONE;
}

/*
 * move the constraint down in the stack
 */

static PyObject *Constraint_moveDown( BPy_Constraint * self )
{
	if( !self->con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint has been removed!" );

	const_moveDown( self->obj, self->con );
	Py_RETURN_NONE;
}

/*
 * add keyframe for influence
	base on code in add_influence_key_to_constraint_func()
 */

static PyObject *Constraint_insertKey( BPy_Constraint * self, PyObject * arg )
{
	IpoCurve *icu;
	float cfra;
	char actname[32] = "";
	Object *ob = self->obj;
	bConstraint *con = self->con;

	if( !self->con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint has been removed!" );

	/* get frame for inserting key */
	if( !PyArg_ParseTuple( arg, "f", &cfra ) )
		return EXPP_ReturnPyObjError( PyExc_TypeError,
				"expected a float argument" );

	// constraint_active_func(ob_v, con_v);
	get_constraint_ipo_context( ob, actname );
	icu= verify_ipocurve((ID *)ob, ID_CO, actname, con->name, CO_ENFORCE);

	if( ob->action )
		insert_vert_ipo( icu, get_action_frame(ob, cfra), con->enforce);
	else
		insert_vert_ipo( icu, cfra, con->enforce);

	Py_RETURN_NONE;
}

/*****************************************************************************/
/* Specific constraint get/set procedures                                    */
/*****************************************************************************/

static PyObject *kinematic_getter( BPy_Constraint * self, int type )
{
	bKinematicConstraint *con = (bKinematicConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_TOLERANCE:
		return PyFloat_FromDouble( (double)con->tolerance );
	case EXPP_CONSTR_ITERATIONS:
		return PyInt_FromLong( (long)con->iterations );
	case EXPP_CONSTR_CHAINLEN:
		return PyInt_FromLong( (long)con->rootbone );
	case EXPP_CONSTR_POSWEIGHT:
		return PyFloat_FromDouble( (double)con->weight );
	case EXPP_CONSTR_ROTWEIGHT:
		return PyFloat_FromDouble( (double)con->orientweight );
	case EXPP_CONSTR_ROTATE:
		return PyBool_FromLong( (long)( con->flag & CONSTRAINT_IK_ROT ) ) ;
	case EXPP_CONSTR_USETIP:
		return PyBool_FromLong( (long)( con->flag & CONSTRAINT_IK_TIP ) ) ;
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int kinematic_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bKinematicConstraint *con = (bKinematicConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_TOLERANCE:
		return EXPP_setFloatClamped( value, &con->tolerance, 0.0001, 1.0 );
	case EXPP_CONSTR_ITERATIONS:
		return EXPP_setIValueClamped( value, &con->iterations, 1, 10000, 'h' );
	case EXPP_CONSTR_CHAINLEN:
		return EXPP_setIValueClamped( value, &con->rootbone, 0, 255, 'i' );
	case EXPP_CONSTR_POSWEIGHT:
		return EXPP_setFloatClamped( value, &con->weight, 0.01, 1.0 );
	case EXPP_CONSTR_ROTWEIGHT:
		return EXPP_setFloatClamped( value, &con->orientweight, 0.01, 1.0 );
	case EXPP_CONSTR_ROTATE:
		return EXPP_setBitfield( value, &con->flag, CONSTRAINT_IK_ROT, 'h' );
	case EXPP_CONSTR_USETIP:
		return EXPP_setBitfield( value, &con->flag, CONSTRAINT_IK_TIP, 'h' );
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *action_getter( BPy_Constraint * self, int type )
{
	bActionConstraint *con = (bActionConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_ACTION:
		return Action_CreatePyObject( con->act );
	case EXPP_CONSTR_LOCAL:
		return PyBool_FromLong( (long)( con->local & SELECT ) );
	case EXPP_CONSTR_START:
		return PyInt_FromLong( (long)con->start );
	case EXPP_CONSTR_END:
		return PyInt_FromLong( (long)con->end );
	case EXPP_CONSTR_MIN:
		return PyFloat_FromDouble( (double)con->min );
	case EXPP_CONSTR_MAX:
		return PyFloat_FromDouble( (double)con->max );
	case EXPP_CONSTR_KEYON:
		return PyInt_FromLong( (long)con->type );
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int action_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bActionConstraint *con = (bActionConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_ACTION: {
		bAction *act = (( BPy_Action * )value)->action;
		if( !Action_CheckPyObject( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy action argument" );
		con->act = act;
		return 0;
		}
	case EXPP_CONSTR_LOCAL:
		return EXPP_setBitfield( value, &con->local, SELECT, 'h' );
	case EXPP_CONSTR_START:
		return EXPP_setIValueClamped( value, &con->start, 1, MAXFRAME, 'h' );
	case EXPP_CONSTR_END:
		return EXPP_setIValueClamped( value, &con->end, 1, MAXFRAME, 'h' );
	case EXPP_CONSTR_MIN:
		return EXPP_setFloatClamped( value, &con->min, -180.0, 180.0 );
	case EXPP_CONSTR_MAX:
		return EXPP_setFloatClamped( value, &con->max, -180.0, 180.0 );
	case EXPP_CONSTR_KEYON:
		return EXPP_setIValueRange( value, &con->type,
				EXPP_CONSTR_XROT, EXPP_CONSTR_ZROT, 'h' );
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *trackto_getter( BPy_Constraint * self, int type )
{
	bTrackToConstraint *con = (bTrackToConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_TRACK:
		return PyInt_FromLong( (long)con->reserved1 );
	case EXPP_CONSTR_UP:
		return PyInt_FromLong( (long)con->reserved2 );
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int trackto_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bTrackToConstraint *con = (bTrackToConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_TRACK:
		return EXPP_setIValueRange( value, &con->reserved1,
				TRACK_X, TRACK_nZ, 'i' );
	case EXPP_CONSTR_UP:
		return EXPP_setIValueRange( value, &con->reserved2,
				UP_X, UP_Z, 'i' );
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *stretchto_getter( BPy_Constraint * self, int type )
{
	bStretchToConstraint *con = (bStretchToConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_RESTLENGTH:
		return PyFloat_FromDouble( (double)con->orglength );
	case EXPP_CONSTR_VOLVARIATION:
		return PyFloat_FromDouble( (double)con->bulge );
	case EXPP_CONSTR_VOLUMEMODE:
		return PyInt_FromLong( (long)con->volmode );
	case EXPP_CONSTR_PLANE:
		return PyInt_FromLong( (long)con->plane );
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int stretchto_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bStretchToConstraint *con = (bStretchToConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_RESTLENGTH:
		return EXPP_setFloatClamped( value, &con->orglength, 0.0, 100.0 );
	case EXPP_CONSTR_VOLVARIATION:
		return EXPP_setFloatClamped( value, &con->bulge, 0.0, 100.0 );
	case EXPP_CONSTR_VOLUMEMODE:
		return EXPP_setIValueRange( value, &con->volmode,
				VOLUME_XZ, NO_VOLUME, 'h' );
	case EXPP_CONSTR_PLANE: {
		int status, oldcode = con->plane;
		status = EXPP_setIValueRange( value, &con->plane,
				PLANE_X, PLANE_Z, 'h' );
		if( !status && con->plane == PLANE_Y ) {
			con->plane = oldcode;
			return EXPP_ReturnIntError( PyExc_ValueError,
					"value must be either PLANEX or PLANEZ" );
		}
		return status;
		}
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *followpath_getter( BPy_Constraint * self, int type )
{
	bFollowPathConstraint *con = (bFollowPathConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_FOLLOW:
		return PyBool_FromLong( (long)( con->followflag & SELECT ) );
	case EXPP_CONSTR_OFFSET:
		return PyFloat_FromDouble( (double)con->offset );
	case EXPP_CONSTR_FORWARD:
		return PyInt_FromLong( (long)con->trackflag );
	case EXPP_CONSTR_UP:
		return PyInt_FromLong( (long)con->upflag );
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int followpath_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bFollowPathConstraint *con = (bFollowPathConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_FOLLOW:
		return EXPP_setBitfield( value, &con->followflag, SELECT, 'i' );
	case EXPP_CONSTR_OFFSET:
		return EXPP_setFloatClamped( value, &con->offset,
				-MAXFRAMEF, MAXFRAMEF );
	case EXPP_CONSTR_FORWARD:
		return EXPP_setIValueRange( value, &con->trackflag,
				TRACK_X, TRACK_nZ, 'i' );
	case EXPP_CONSTR_UP:
		return EXPP_setIValueRange( value, &con->upflag,
				UP_X, UP_Z, 'i' );
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *locktrack_getter( BPy_Constraint * self, int type )
{
	bLockTrackConstraint *con = (bLockTrackConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_TRACK:
		return PyInt_FromLong( (long)con->trackflag );
	case EXPP_CONSTR_LOCK:
		return PyInt_FromLong( (long)con->lockflag );
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int locktrack_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bLockTrackConstraint *con = (bLockTrackConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_TRACK:
		return EXPP_setIValueRange( value, &con->trackflag,
				TRACK_X, TRACK_nZ, 'i' );
	case EXPP_CONSTR_LOCK:
		return EXPP_setIValueRange( value, &con->lockflag,
				LOCK_X, LOCK_Z, 'i' );
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *floor_getter( BPy_Constraint * self, int type )
{
	bMinMaxConstraint *con = (bMinMaxConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_MINMAX:
		return PyInt_FromLong( (long)con->minmaxflag );
	case EXPP_CONSTR_OFFSET:
		return PyFloat_FromDouble( (double)con->offset );
	case EXPP_CONSTR_STICKY:
		return PyBool_FromLong( (long)( con->sticky & SELECT ) ) ;
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int floor_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bMinMaxConstraint *con = (bMinMaxConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_MINMAX:
		return EXPP_setIValueRange( value, &con->minmaxflag,
				EXPP_CONSTR_MAXX, EXPP_CONSTR_MINZ, 'i' );
	case EXPP_CONSTR_OFFSET:
		return EXPP_setFloatClamped( value, &con->offset, -100.0, 100.0 );
	case EXPP_CONSTR_STICKY:
		return EXPP_setBitfield( value, &con->sticky, SELECT, 'h' );
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *locatelike_getter( BPy_Constraint * self, int type )
{
	bLocateLikeConstraint *con = (bLocateLikeConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_COPY:
		return PyInt_FromLong( (long)con->flag );
	case EXPP_CONSTR_LOCAL:
		if( get_armature( con->tar ) )
			return PyBool_FromLong( (long)
					( self->con->flag & CONSTRAINT_LOCAL ) ) ;
		Py_RETURN_NONE;
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int locatelike_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bLocateLikeConstraint *con = (bLocateLikeConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_COPY:
		return EXPP_setIValueRange( value, &con->flag,
				0, LOCLIKE_X | LOCLIKE_Y | LOCLIKE_Z, 'i' );
	case EXPP_CONSTR_LOCAL:
		if( !get_armature( con->tar ) )
			return EXPP_ReturnIntError( PyExc_RuntimeError,
					"only armature targets have LOCAL key" );
		return EXPP_setBitfield( value, &self->con->flag,
				CONSTRAINT_LOCAL, 'h' );
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *rotatelike_getter( BPy_Constraint * self, int type )
{
	bRotateLikeConstraint *con = (bRotateLikeConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_COPY:
		return PyInt_FromLong( (long)con->flag );
	case EXPP_CONSTR_LOCAL:
		if( get_armature( con->tar ) )
			return PyBool_FromLong( (long)
					( self->con->flag & CONSTRAINT_LOCAL ) ) ;
		Py_RETURN_NONE;
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int rotatelike_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bRotateLikeConstraint *con = (bRotateLikeConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_COPY:
		return EXPP_setIValueRange( value, &con->flag,
				0, LOCLIKE_X | LOCLIKE_Y | LOCLIKE_Z, 'i' );
	case EXPP_CONSTR_LOCAL:
		if( !get_armature( con->tar ) )
			return EXPP_ReturnIntError( PyExc_RuntimeError,
					"only armature targets have LOCAL key" );
		return EXPP_setBitfield( value, &self->con->flag,
				CONSTRAINT_LOCAL, 'h' );
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

static PyObject *sizelike_getter( BPy_Constraint * self, int type )
{
	bSizeLikeConstraint *con = (bSizeLikeConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET:
		return Object_CreatePyObject( con->tar );
	case EXPP_CONSTR_BONE:
		return PyString_FromString( con->subtarget );
	case EXPP_CONSTR_COPY:
		return PyInt_FromLong( (long)con->flag );
#if 0
	case EXPP_CONSTR_LOCAL:
		if( get_armature( con->tar ) )
			return PyBool_FromLong( (long)
					( self->con->flag & CONSTRAINT_LOCAL ) ) ;
		Py_RETURN_NONE;
#endif
	default:
		return EXPP_ReturnPyObjError( PyExc_KeyError, "key not found" );
	}
}

static int sizelike_setter( BPy_Constraint *self, int type, PyObject *value )
{
	bSizeLikeConstraint *con = (bSizeLikeConstraint *)(self->con->data);

	switch( type ) {
	case EXPP_CONSTR_TARGET: {
		Object *obj = (( BPy_Object * )value)->object;
		if( !BPy_Object_Check( value ) )
			return EXPP_ReturnIntError( PyExc_TypeError, 
					"expected BPy object argument" );
		con->tar = obj;
		return 0;
		}
	case EXPP_CONSTR_BONE: {
		char *name = PyString_AsString( value );
		if( !name )
			return EXPP_ReturnIntError( PyExc_TypeError,
					"expected string arg" );

		BLI_strncpy( con->subtarget, name, sizeof( con->subtarget ) );

		return 0;
		}
	case EXPP_CONSTR_COPY:
		return EXPP_setIValueRange( value, &con->flag,
				0, LOCLIKE_X | LOCLIKE_Y | LOCLIKE_Z, 'i' );
#if 0
	case EXPP_CONSTR_LOCAL:
		if( !get_armature( con->tar ) )
			return EXPP_ReturnIntError( PyExc_RuntimeError,
					"only armature targets have LOCAL key" );
		return EXPP_setBitfield( value, &self->con->flag,
				CONSTRAINT_LOCAL, 'h' );
#endif
	default:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	}
}

/*
 * get data from a constraint
 */

static PyObject *Constraint_getData( BPy_Constraint * self, PyObject * key )
{
	int setting;

	if( !PyInt_CheckExact( key ) )
		return EXPP_ReturnPyObjError( PyExc_TypeError,
				"expected an int arg" );

	if( !self->con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint has been removed!" );
	
	setting = PyInt_AsLong( key );
	switch( self->con->type ) {
		case CONSTRAINT_TYPE_NULL:
			Py_RETURN_NONE;
		case CONSTRAINT_TYPE_TRACKTO:
			return trackto_getter( self, setting );
		case CONSTRAINT_TYPE_KINEMATIC:
			return kinematic_getter( self, setting );
		case CONSTRAINT_TYPE_FOLLOWPATH:
			return followpath_getter( self, setting );
		case CONSTRAINT_TYPE_ACTION:
			return action_getter( self, setting );
		case CONSTRAINT_TYPE_LOCKTRACK:
			return locktrack_getter( self, setting );
		case CONSTRAINT_TYPE_STRETCHTO:
			return stretchto_getter( self, setting );
		case CONSTRAINT_TYPE_MINMAX:
			return floor_getter( self, setting );
		case CONSTRAINT_TYPE_LOCLIKE:
			return locatelike_getter( self, setting );
		case CONSTRAINT_TYPE_ROTLIKE:
			return rotatelike_getter( self, setting );
		case CONSTRAINT_TYPE_SIZELIKE:
			return sizelike_getter( self, setting );

		case CONSTRAINT_TYPE_CHILDOF:	/* Unimplemented */
		case CONSTRAINT_TYPE_ROTLIMIT:
		case CONSTRAINT_TYPE_LOCLIMIT:
		case CONSTRAINT_TYPE_SIZELIMIT:
		case CONSTRAINT_TYPE_PYTHON:
		default:
			return EXPP_ReturnPyObjError( PyExc_KeyError,
					"unknown constraint type" );
	}
}

static int Constraint_setData( BPy_Constraint * self, PyObject * key, 
		PyObject * arg )
{
	int key_int, result;

	if( !PyNumber_Check( key ) )
		return EXPP_ReturnIntError( PyExc_TypeError,
				"expected an int arg" );
	if( !self->con )
		return EXPP_ReturnIntError( PyExc_RuntimeError,
				"This constraint has been removed!" );
	
	key_int = PyInt_AsLong( key );
	switch( self->con->type ) {
	case CONSTRAINT_TYPE_KINEMATIC:
		result = kinematic_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_ACTION:
		result = action_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_TRACKTO:
		result = trackto_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_STRETCHTO:
		result = stretchto_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_FOLLOWPATH:
		result = followpath_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_LOCKTRACK:
		result = locktrack_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_MINMAX:
		result = floor_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_LOCLIKE:
		result = locatelike_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_ROTLIKE:
		result = rotatelike_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_SIZELIKE:
		result = sizelike_setter( self, key_int, arg );
		break;
	case CONSTRAINT_TYPE_NULL:
		return EXPP_ReturnIntError( PyExc_KeyError, "key not found" );
	case CONSTRAINT_TYPE_CHILDOF:	/* Unimplemented */
	case CONSTRAINT_TYPE_ROTLIMIT:
	case CONSTRAINT_TYPE_LOCLIMIT:
	case CONSTRAINT_TYPE_SIZELIMIT:
	case CONSTRAINT_TYPE_PYTHON:
	default:
		return EXPP_ReturnIntError( PyExc_RuntimeError,
				"unsupported constraint setting" );
	}
	if( !result && self->pchan )
		update_pose_constraint_flags( self->obj->pose );
	return result;
}

/*****************************************************************************/
/* Function:    Constraint_dealloc                                           */
/* Description: This is a callback function for the BPy_Constraint type. It  */
/*              destroys data when the object is deleted.                    */
/*****************************************************************************/
static void Constraint_dealloc( BPy_Constraint * self )
{
	PyObject_DEL( self );
}

/*****************************************************************************/
/* Function:    Constraint_repr                                              */
/* Description: This is a callback function for the BPy_Constraint type. It  */
/*              builds a meaningful string to represent constraint objects.  */
/*****************************************************************************/

static PyObject *Constraint_repr( BPy_Constraint * self )
{
	char type[32];

	if( !self->con )
		return PyString_FromString( "[Constraint - Removed]");

	get_constraint_typestring (type,  self->con);
	return PyString_FromFormat( "[Constraint \"%s\", Type \"%s\"]",
			self->con->name, type );
}

/* Three Python Constraint_Type helper functions needed by the Object module: */

/*****************************************************************************/
/* Function:    Constraint_CreatePyObject                                    */
/* Description: This function will create a new BPy_Constraint from an       */
/*              existing Blender constraint structure.                       */
/*****************************************************************************/
PyObject *Constraint_CreatePyObject( bPoseChannel *pchan, Object *obj,
		bConstraint *con )
{
	BPy_Constraint *pycon;
	pycon = ( BPy_Constraint * ) PyObject_NEW( BPy_Constraint,
			&Constraint_Type );
	if( !pycon )
		return EXPP_ReturnPyObjError( PyExc_MemoryError,
					      "couldn't create BPy_Constraint object" );

	pycon->con = con;

	/* one of these two will be NULL */
	pycon->obj = obj;	
	pycon->pchan = pchan;
	return ( PyObject * ) pycon;
}

/*****************************************************************************/
/* Function:    Constraint_CheckPyObject                                     */
/* Description: This function returns true when the given PyObject is of the */
/*              type Constraint. Otherwise it will return false.               */
/*****************************************************************************/
int Constraint_CheckPyObject( PyObject * pyobj )
{
	return ( pyobj->ob_type == &Constraint_Type );
}

/*****************************************************************************/
/* Function:    Constraint_FromPyObject                                      */
/* Description: This function returns the Blender constraint from the given  */
/*              PyObject.                                                    */
/*****************************************************************************/
bConstraint *Constraint_FromPyObject( BPy_Constraint * self )
{
	return self->con;
}

/*****************************************************************************/
/* Constraint Sequence wrapper                                               */
/*****************************************************************************/

/*
 * Initialize the interator
 */

static PyObject *ConstraintSeq_getIter( BPy_ConstraintSeq * self )
{
	if( self->pchan )
		self->iter = (bConstraint *)self->pchan->constraints.first;
	else
		self->iter = (bConstraint *)self->obj->constraints.first;
	return EXPP_incr_ret ( (PyObject *) self );
}

/*
 * Get the next Constraint
 */

static PyObject *ConstraintSeq_nextIter( BPy_ConstraintSeq * self )
{
	bConstraint *this = self->iter;
	if( this ) {
		self->iter = this->next;
		return Constraint_CreatePyObject( self->pchan, self->obj, this );
	}

	return EXPP_ReturnPyObjError( PyExc_StopIteration,
			"iterator at end" );
}

/* return the number of constraints */

static int ConstraintSeq_length( BPy_ConstraintSeq * self )
{
	return BLI_countlist( self->pchan ?
		&self->pchan->constraints : &self->obj->constraints );
}

/* return a constraint */

static PyObject *ConstraintSeq_item( BPy_ConstraintSeq * self, int i )
{
	bConstraint *con = NULL;

	/* if index is negative, start counting from the end of the list */
	if( i < 0 )
		i += ConstraintSeq_length( self );

	/* skip through the list until we get the constraint or end of list */

	if( self->pchan )
		con = self->pchan->constraints.first;
	else
		con = self->obj->constraints.first;

	while( i && con ) {
		--i;
		con = con->next;
	}

	if( con )
		return Constraint_CreatePyObject( self->pchan, self->obj, con );
	else
		return EXPP_ReturnPyObjError( PyExc_IndexError,
				"array index out of range" );
}

/*****************************************************************************/
/* Python BPy_ConstraintSeq sequence table:                                  */
/*****************************************************************************/
static PySequenceMethods ConstraintSeq_as_sequence = {
	( inquiry ) ConstraintSeq_length,	/* sq_length */
	( binaryfunc ) 0,	/* sq_concat */
	( intargfunc ) 0,	/* sq_repeat */
	( intargfunc ) ConstraintSeq_item,	/* sq_item */
	( intintargfunc ) 0,	/* sq_slice */
	( intobjargproc ) 0,	/* sq_ass_item */
	( intintobjargproc ) 0,	/* sq_ass_slice */
	( objobjproc ) 0,	/* sq_contains */
	( binaryfunc ) 0,		/* sq_inplace_concat */
	( intargfunc ) 0,		/* sq_inplace_repeat */
};

/* create a new constraint at the end of the list */

static PyObject *ConstraintSeq_append( BPy_ConstraintSeq *self, PyObject *args )
{
	int type;
	bConstraint *con;

	if( !PyArg_ParseTuple( args, "i", &type ) )
		EXPP_ReturnPyObjError( PyExc_TypeError, "expected int argument" );

	/* type 0 is CONSTRAINT_TYPE_NULL, should we be able to add one of these? */
	if( type < CONSTRAINT_TYPE_NULL || type > CONSTRAINT_TYPE_MINMAX ) 
		return EXPP_ReturnPyObjError( PyExc_ValueError,
				"int argument out of range" );

	con = add_new_constraint( type );
	if( self->pchan ) {
		BLI_addtail( &self->pchan->constraints, con );
		update_pose_constraint_flags( self->obj->pose );
	}
	else
		BLI_addtail( &self->obj->constraints, con );

	return Constraint_CreatePyObject( self->pchan, self->obj, con );
				
}

/* remove an existing constraint */

static PyObject *ConstraintSeq_remove( BPy_ConstraintSeq *self, PyObject *args )
{
	BPy_Constraint *pyobj;
	Object *obj;
	bConstraint *con;

	/* check that argument is a constraint */
	if( !PyArg_ParseTuple( args, "O!", &Constraint_Type, &pyobj ) )
		return EXPP_ReturnPyObjError( PyExc_TypeError,
				"expected a constraint as an argument" );

	/* 
	 * check that constraintseq and constraint refer to the same object
	 * (this is more for user sanity than anything else)
	 */

	if( self->obj != pyobj->obj )
		return EXPP_ReturnPyObjError( PyExc_AttributeError,
				"constraint does not belong to this object" );
	obj = self->obj;

	if( !pyobj->con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint has already been removed!" );

	/* verify the constraint is still exists in the stack */
	if( self->pchan )
		con = self->pchan->constraints.first;
	else
		con = obj->constraints.first;
	while( con && con != pyobj->con )
	   	con = con->next;
	if( !con )
		return EXPP_ReturnPyObjError( PyExc_RuntimeError,
				"This constraint is no longer in the object's stack" );

	/* do the actual removal */
	if( self->pchan )
		BLI_remlink(&(self->pchan->constraints), con);
	else
		BLI_remlink(&(obj->constraints), con);
	del_constr_func (obj, con);

	pyobj->con = NULL;
	Py_RETURN_NONE;
}

/*****************************************************************************/
/* Function:    ConstraintSeq_dealloc                                        */
/* Description: This is a callback function for the BPy_ConstraintSeq type.  */
/*              It destroys data when the object is deleted.                 */
/*****************************************************************************/
static void ConstraintSeq_dealloc( BPy_Constraint * self )
{
	PyObject_DEL( self );
}

/*****************************************************************************/
/* Python BPy_ConstraintSeq methods table:                                   */
/*****************************************************************************/
static PyMethodDef BPy_ConstraintSeq_methods[] = {
	/* name, method, flags, doc */
	{"append", ( PyCFunction ) ConstraintSeq_append, METH_VARARGS,
	 "(type) - add a new constraint, where type is the constraint type"},
	{"remove", ( PyCFunction ) ConstraintSeq_remove, METH_VARARGS,
	 "(con) - remove an existing constraint, where con is a constraint from this object."},
	{NULL, NULL, 0, NULL}
};

/*****************************************************************************/
/* Python ConstraintSeq_Type structure definition:                           */
/*****************************************************************************/
PyTypeObject ConstraintSeq_Type = {
	PyObject_HEAD_INIT( NULL )  /* required py macro */
	0,                          /* ob_size */
	/*  For printing, in format "<module>.<name>" */
	"Blender Constraint Sequence",/* char *tp_name; */
	sizeof( BPy_ConstraintSeq ),     /* int tp_basicsize; */
	0,                          /* tp_itemsize;  For allocation */

	/* Methods to implement standard operations */

	( destructor ) ConstraintSeq_dealloc,/* destructor tp_dealloc; */
	NULL,                       /* printfunc tp_print; */
	NULL,                       /* getattrfunc tp_getattr; */
	NULL,                       /* setattrfunc tp_setattr; */
	NULL,                       /* cmpfunc tp_compare; */
	( reprfunc ) NULL,          /* reprfunc tp_repr; */

	/* Method suites for standard classes */

	NULL,                       /* PyNumberMethods *tp_as_number; */
	&ConstraintSeq_as_sequence,        /* PySequenceMethods *tp_as_sequence; */
	NULL,                       /* PyMappingMethods *tp_as_mapping; */

	/* More standard operations (here for binary compatibility) */

	NULL,                       /* hashfunc tp_hash; */
	NULL,                       /* ternaryfunc tp_call; */
	NULL,                       /* reprfunc tp_str; */
	NULL,                       /* getattrofunc tp_getattro; */
	NULL,                       /* setattrofunc tp_setattro; */

	/* Functions to access object as input/output buffer */
	NULL,                       /* PyBufferProcs *tp_as_buffer; */

  /*** Flags to define presence of optional/expanded features ***/
	Py_TPFLAGS_DEFAULT,         /* long tp_flags; */

	NULL,                       /*  char *tp_doc;  Documentation string */
  /*** Assigned meaning in release 2.0 ***/
	/* call function for all accessible objects */
	NULL,                       /* traverseproc tp_traverse; */

	/* delete references to contained objects */
	NULL,                       /* inquiry tp_clear; */

  /***  Assigned meaning in release 2.1 ***/
  /*** rich comparisons ***/
	NULL,                       /* richcmpfunc tp_richcompare; */

  /***  weak reference enabler ***/
	0,                          /* long tp_weaklistoffset; */

  /*** Added in release 2.2 ***/
	/*   Iterators */
	( getiterfunc )ConstraintSeq_getIter, /* getiterfunc tp_iter; */
    ( iternextfunc )ConstraintSeq_nextIter, /* iternextfunc tp_iternext; */

  /*** Attribute descriptor and subclassing stuff ***/
	BPy_ConstraintSeq_methods,         /* struct PyMethodDef *tp_methods; */
	NULL,                       /* struct PyMemberDef *tp_members; */
	NULL,                       /* struct PyGetSetDef *tp_getset; */
	NULL,                       /* struct _typeobject *tp_base; */
	NULL,                       /* PyObject *tp_dict; */
	NULL,                       /* descrgetfunc tp_descr_get; */
	NULL,                       /* descrsetfunc tp_descr_set; */
	0,                          /* long tp_dictoffset; */
	NULL,                       /* initproc tp_init; */
	NULL,                       /* allocfunc tp_alloc; */
	NULL,                       /* newfunc tp_new; */
	/*  Low-level free-memory routine */
	NULL,                       /* freefunc tp_free;  */
	/* For PyObject_IS_GC */
	NULL,                       /* inquiry tp_is_gc;  */
	NULL,                       /* PyObject *tp_bases; */
	/* method resolution order */
	NULL,                       /* PyObject *tp_mro;  */
	NULL,                       /* PyObject *tp_cache; */
	NULL,                       /* PyObject *tp_subclasses; */
	NULL,                       /* PyObject *tp_weaklist; */
	NULL
};

/*****************************************************************************/
/* Function:    PoseConstraintSeq_CreatePyObject                             */
/* Description: This function will create a new BPy_ConstraintSeq from an    */
/*              existing ListBase structure.                                 */
/*****************************************************************************/
PyObject *PoseConstraintSeq_CreatePyObject( bPoseChannel *pchan )
{
	BPy_ConstraintSeq *pyseq;
	Object *ob;

	for( ob = G.main->object.first; ob; ob = ob->id.next ) {
		if( ob->type == OB_ARMATURE ) {
			bPoseChannel *p = ob->pose->chanbase.first;
			while( p ) {
				if( p == pchan ) {
					pyseq = ( BPy_ConstraintSeq * ) PyObject_NEW( 
							BPy_ConstraintSeq, &ConstraintSeq_Type );
					if( !pyseq )
						return EXPP_ReturnPyObjError( PyExc_MemoryError,
								"couldn't create BPy_ConstraintSeq object" );
					pyseq->pchan = pchan;
					pyseq->obj = ob;
					return ( PyObject * ) pyseq;
				} else
					p = p->next;
			}
		}
	}
	return EXPP_ReturnPyObjError( PyExc_RuntimeError,
			"couldn't find ANY armature with the pose!" );

}

/*****************************************************************************/
/* Function:    ObConstraintSeq_CreatePyObject                               */
/* Description: This function will create a new BPy_ConstraintSeq from an    */
/*              existing ListBase structure.                                 */
/*****************************************************************************/
PyObject *ObConstraintSeq_CreatePyObject( Object *obj )
{
	BPy_ConstraintSeq *pyseq;
	pyseq = ( BPy_ConstraintSeq * ) PyObject_NEW( BPy_ConstraintSeq,
			&ConstraintSeq_Type );
	if( !pyseq )
		return EXPP_ReturnPyObjError( PyExc_MemoryError,
					      "couldn't create BPy_ConstraintSeq object" );
	pyseq->obj = obj;
	pyseq->pchan = NULL;
	return ( PyObject * ) pyseq;
}

static PyObject *M_Constraint_TypeDict( void )
{
	PyObject *S = PyConstant_New(  );

	if( S ) {
		BPy_constant *d = ( BPy_constant * ) S;
		PyConstant_Insert( d, "NULL", 
				PyInt_FromLong( CONSTRAINT_TYPE_NULL ) );
		PyConstant_Insert( d, "TRACKTO",
				PyInt_FromLong( CONSTRAINT_TYPE_TRACKTO ) );
		PyConstant_Insert( d, "IKSOLVER", 
				PyInt_FromLong( CONSTRAINT_TYPE_KINEMATIC ) );
		PyConstant_Insert( d, "FOLLOWPATH", 
				PyInt_FromLong( CONSTRAINT_TYPE_FOLLOWPATH ) );
		PyConstant_Insert( d, "COPYROT", 
				PyInt_FromLong( CONSTRAINT_TYPE_ROTLIKE ) );
		PyConstant_Insert( d, "COPYLOC", 
				PyInt_FromLong( CONSTRAINT_TYPE_LOCLIKE ) );
		PyConstant_Insert( d, "COPYSIZE", 
				PyInt_FromLong( CONSTRAINT_TYPE_SIZELIKE ) );
		PyConstant_Insert( d, "ACTION", 
				PyInt_FromLong( CONSTRAINT_TYPE_ACTION ) );
		PyConstant_Insert( d, "LOCKTRACK", 
				PyInt_FromLong( CONSTRAINT_TYPE_LOCKTRACK ) );
		PyConstant_Insert( d, "STRETCHTO", 
				PyInt_FromLong( CONSTRAINT_TYPE_STRETCHTO ) );
		PyConstant_Insert( d, "FLOOR", 
				PyInt_FromLong( CONSTRAINT_TYPE_MINMAX ) );
	}
	return S;
}

static PyObject *M_Constraint_SettingsDict( void )
{
	PyObject *S = PyConstant_New(  );
	
	if( S ) {
		BPy_constant *d = ( BPy_constant * ) S;
		PyConstant_Insert( d, "XROT",
				PyInt_FromLong( EXPP_CONSTR_XROT ) );
		PyConstant_Insert( d, "YROT",
				PyInt_FromLong( EXPP_CONSTR_YROT ) );
		PyConstant_Insert( d, "ZROT",
				PyInt_FromLong( EXPP_CONSTR_ZROT ) );

		PyConstant_Insert( d, "UPX",
				PyInt_FromLong( UP_X ) );
		PyConstant_Insert( d, "UPY",
				PyInt_FromLong( UP_Y ) );
		PyConstant_Insert( d, "UPZ",
				PyInt_FromLong( UP_Z ) );

		PyConstant_Insert( d, "TRACKX",
				PyInt_FromLong( TRACK_X ) );
		PyConstant_Insert( d, "TRACKY",
				PyInt_FromLong( TRACK_Y ) );
		PyConstant_Insert( d, "TRACKZ",
				PyInt_FromLong( TRACK_Z ) );
		PyConstant_Insert( d, "TRACKNEGX",
				PyInt_FromLong( TRACK_nX ) );
		PyConstant_Insert( d, "TRACKNEGY",
				PyInt_FromLong( TRACK_nY ) );
		PyConstant_Insert( d, "TRACKNEGZ",
				PyInt_FromLong( TRACK_nZ ) );

		PyConstant_Insert( d, "VOLUMEXZ",
				PyInt_FromLong( VOLUME_XZ ) );
		PyConstant_Insert( d, "VOLUMEX",
				PyInt_FromLong( VOLUME_X ) );
		PyConstant_Insert( d, "VOLUMEZ",
				PyInt_FromLong( VOLUME_Z ) );
		PyConstant_Insert( d, "VOLUMENONE",
				PyInt_FromLong( NO_VOLUME ) );

		PyConstant_Insert( d, "PLANEX",
				PyInt_FromLong( PLANE_X ) );
		PyConstant_Insert( d, "PLANEY",
				PyInt_FromLong( PLANE_Y ) );
		PyConstant_Insert( d, "PLANEZ",
				PyInt_FromLong( PLANE_Z ) );

		PyConstant_Insert( d, "LOCKX",
				PyInt_FromLong( LOCK_X ) );
		PyConstant_Insert( d, "LOCKY",
				PyInt_FromLong( LOCK_Y ) );
		PyConstant_Insert( d, "LOCKZ",
				PyInt_FromLong( LOCK_Z ) );

		PyConstant_Insert( d, "MAXX",
				PyInt_FromLong( EXPP_CONSTR_MAXX ) );
		PyConstant_Insert( d, "MAXY",
				PyInt_FromLong( EXPP_CONSTR_MAXY ) );
		PyConstant_Insert( d, "MAXZ",
				PyInt_FromLong( EXPP_CONSTR_MAXZ ) );
		PyConstant_Insert( d, "MINX",
				PyInt_FromLong( EXPP_CONSTR_MINX ) );
		PyConstant_Insert( d, "MINY",
				PyInt_FromLong( EXPP_CONSTR_MINY ) );
		PyConstant_Insert( d, "MINZ",
				PyInt_FromLong( EXPP_CONSTR_MINZ ) );

		PyConstant_Insert( d, "COPYX",
				PyInt_FromLong( LOCLIKE_X ) );
		PyConstant_Insert( d, "COPYY",
				PyInt_FromLong( LOCLIKE_Y ) );
		PyConstant_Insert( d, "COPYZ",
				PyInt_FromLong( LOCLIKE_Z ) );

		PyConstant_Insert( d, "TARGET",
				PyInt_FromLong( EXPP_CONSTR_TARGET ) );
		PyConstant_Insert( d, "TOLERANCE", 
				PyInt_FromLong( EXPP_CONSTR_TOLERANCE ) );
		PyConstant_Insert( d, "ITERATIONS", 
				PyInt_FromLong( EXPP_CONSTR_ITERATIONS ) );
		PyConstant_Insert( d, "BONE", 
				PyInt_FromLong( EXPP_CONSTR_BONE ) );
		PyConstant_Insert( d, "CHAINLEN", 
				PyInt_FromLong( EXPP_CONSTR_CHAINLEN ) );
		PyConstant_Insert( d, "POSWEIGHT", 
				PyInt_FromLong( EXPP_CONSTR_POSWEIGHT ) );
		PyConstant_Insert( d, "ROTWEIGHT", 
				PyInt_FromLong( EXPP_CONSTR_ROTWEIGHT ) );
		PyConstant_Insert( d, "ROTATE", 
				PyInt_FromLong( EXPP_CONSTR_ROTATE ) );
		PyConstant_Insert( d, "USETIP", 
				PyInt_FromLong( EXPP_CONSTR_USETIP ) );

		PyConstant_Insert( d, "ACTION", 
				PyInt_FromLong( EXPP_CONSTR_ACTION ) );
		PyConstant_Insert( d, "LOCAL", 
				PyInt_FromLong( EXPP_CONSTR_LOCAL ) );
		PyConstant_Insert( d, "START", 
				PyInt_FromLong( EXPP_CONSTR_START ) );
		PyConstant_Insert( d, "END", 
				PyInt_FromLong( EXPP_CONSTR_END ) );
		PyConstant_Insert( d, "MIN", 
				PyInt_FromLong( EXPP_CONSTR_MIN ) );
		PyConstant_Insert( d, "MAX", 
				PyInt_FromLong( EXPP_CONSTR_MAX ) );
		PyConstant_Insert( d, "KEYON", 
				PyInt_FromLong( EXPP_CONSTR_KEYON ) );

		PyConstant_Insert( d, "TRACK", 
				PyInt_FromLong( EXPP_CONSTR_TRACK ) );
		PyConstant_Insert( d, "UP", 
				PyInt_FromLong( EXPP_CONSTR_UP ) );

		PyConstant_Insert( d, "RESTLENGTH",
				PyInt_FromLong( EXPP_CONSTR_RESTLENGTH ) );
		PyConstant_Insert( d, "VOLVARIATION",
				PyInt_FromLong( EXPP_CONSTR_VOLVARIATION ) );
		PyConstant_Insert( d, "VOLUMEMODE",
				PyInt_FromLong( EXPP_CONSTR_VOLUMEMODE ) );
		PyConstant_Insert( d, "PLANE",
				PyInt_FromLong( EXPP_CONSTR_PLANE ) );

		PyConstant_Insert( d, "FOLLOW",
				PyInt_FromLong( EXPP_CONSTR_FOLLOW ) );
		PyConstant_Insert( d, "OFFSET",
				PyInt_FromLong( EXPP_CONSTR_OFFSET ) );
		PyConstant_Insert( d, "FORWARD",
				PyInt_FromLong( EXPP_CONSTR_FORWARD ) );

		PyConstant_Insert( d, "LOCK",
				PyInt_FromLong( EXPP_CONSTR_LOCK ) );

		PyConstant_Insert( d, "COPY",
				PyInt_FromLong( EXPP_CONSTR_COPY ) );
	}
	return S;
}

/*****************************************************************************/
/* Function:              Constraint_Init                                    */
/*****************************************************************************/
PyObject *Constraint_Init( void )
{
	PyObject *submodule;
	PyObject *TypeDict = M_Constraint_TypeDict( );
	PyObject *SettingsDict = M_Constraint_SettingsDict( );

	if( PyType_Ready( &ConstraintSeq_Type ) < 0
			|| PyType_Ready( &Constraint_Type ) < 0 )
		return NULL;

	submodule = Py_InitModule3( "Blender.Constraint", NULL,
			"Constraint module for accessing and creating constraint data" );

	if( TypeDict )
		PyModule_AddObject( submodule, "Type", TypeDict );
	
	if( SettingsDict )
		PyModule_AddObject( submodule, "Settings", SettingsDict );
	
	return submodule;
}