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Adding Blender.Geometry function PointInTriangle2D

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Campbell Barton 2007-04-27 20:48:23 +00:00
parent c84d18a679
commit a2000b53cd
2 changed files with 33 additions and 0 deletions
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25
source/blender/python/api2_2x/Geometry.c
View File

@ -54,17 +54,20 @@
/*-- forward declarations -- */
static PyObject *M_Geometry_PolyFill( PyObject * self, PyObject * args );
static PyObject *M_Geometry_LineIntersect2D( PyObject * self, PyObject * args );
static PyObject *M_Geometry_PointInTriangle2D( PyObject * self, PyObject * args );
static PyObject *M_Geometry_BoxPack2D( PyObject * self, PyObject * args );
/*-------------------------DOC STRINGS ---------------------------*/
static char M_Geometry_doc[] = "The Blender Geometry module\n\n";
static char M_Geometry_PolyFill_doc[] = "(veclist_list) - takes a list of polylines (each point a vector) and returns the point indicies for a polyline filled with triangles";
static char M_Geometry_LineIntersect2D_doc[] = "(lineA_p1, lineA_p2, lineB_p1, lineB_p2) - takes 2 lines (as 4 vectors) and returns a vector for their point of intersection or None";
static char M_Geometry_PointInTriangle2D_doc[] = "(pt, tri_p1, tri_p2, tri_p3) - takes 4 vectors, one is the point and the next 3 define the triabgle, only the x and y are used from the vectors";
static char M_Geometry_BoxPack2D_doc[] = "";
/*-----------------------METHOD DEFINITIONS ----------------------*/
struct PyMethodDef M_Geometry_methods[] = {
{"PolyFill", ( PyCFunction ) M_Geometry_PolyFill, METH_VARARGS, M_Geometry_PolyFill_doc},
{"LineIntersect2D", ( PyCFunction ) M_Geometry_LineIntersect2D, METH_VARARGS, M_Geometry_LineIntersect2D_doc},
{"PointInTriangle2D", ( PyCFunction ) M_Geometry_PointInTriangle2D, METH_VARARGS, M_Geometry_PointInTriangle2D_doc},
{"BoxPack2D", ( PyCFunction ) M_Geometry_BoxPack2D, METH_VARARGS, M_Geometry_BoxPack2D_doc},
{NULL, NULL, 0, NULL}
};
@ -274,6 +277,28 @@ static PyObject *M_Geometry_LineIntersect2D( PyObject * self, PyObject * args )
Py_RETURN_NONE;
}
#define SIDE_OF_LINE(pa,pb,pp) ((pa[0]-pp[0])*(pb[1]-pp[1]))-((pb[0]-pp[0])*(pa[1]-pp[1]))
#define POINT_IN_TRI(p0,p1,p2,p3) ((SIDE_OF_LINE(p1,p2,p0)>=0) && (SIDE_OF_LINE(p2,p3,p0)>=0) && (SIDE_OF_LINE(p3,p1,p0)>=0))
static PyObject *M_Geometry_PointInTriangle2D( PyObject * self, PyObject * args )
{
VectorObject *pt_vec, *tri_p1, *tri_p2, *tri_p3;
if( !PyArg_ParseTuple ( args, "O!O!O!O!",
&vector_Type, &pt_vec,
&vector_Type, &tri_p1,
&vector_Type, &tri_p2,
&vector_Type, &tri_p3)
)
return ( EXPP_ReturnPyObjError
( PyExc_TypeError, "expected 4 vector types\n" ) );
if POINT_IN_TRI(pt_vec->vec, tri_p1->vec, tri_p2->vec, tri_p3->vec)
Py_RETURN_TRUE;
else
Py_RETURN_FALSE;
}
int boxPack_FromPyObject(PyObject * value, boxPack **boxarray )
{
int len, i;

8
source/blender/python/api2_2x/doc/Geometry.py
View File

@ -48,6 +48,14 @@ def LineIntersect2D(vec1, vec2, vec3, vec4):
@return: a 2D Vector for the intersection or None where there is no intersection.
"""
def PointInTriangle2D(pt, tri_pt1, tri_pt2, tri_pt3):
"""
Takes 4 vectors (one for the test point and 3 for the triangle)
This is a 2d function so only X and Y are used, Z and W will be ignored.
@rtype: bool
@return: True or False depending on the points intersection.
"""
def BoxPack2D(boxlist):
"""
Takes a list of 2D boxes and packs them into a square.