static PyObject *Polygon_opUnion(Polygon *self, Polygon *other) {
gpc_polygon *ret;
if (! Polygon_Check(other)) return Polygon_Raise(ERR_TYP);
if (! (ret = poly_p_new())) return Polygon_Raise(ERR_MEM);
gpc_polygon_clip(GPC_UNION, self->p, other->p, ret);
return (PyObject *)Polygon_NEW(ret);
}
static PyObject *Polygon_overlaps(Polygon *self, Polygon *other) {
double x0, x1, y0, y1, X0, X1, Y0, Y1;
gpc_polygon * pres;
int r;
if (! Polygon_Check(other))
return Polygon_Raise(ERR_ARG);
Polygon_getBoundingBox(self, &x0, &x1, &y0, &y1);
Polygon_getBoundingBox(other, &X0, &X1, &Y0, &Y1);
/* first test if bounding box overlaps other boundingbox */
if ((X0 > x1) || (x0 > X1) || (Y0 > y1) || (y0 > Y1))
return Py_BuildValue("i", 0);
/* still there? Let's do the full test... */
if (! (pres = poly_p_new())) return Polygon_Raise(ERR_MEM);
gpc_polygon_clip(GPC_INT, other->p, self->p, pres);
r = pres->num_contours;
gpc_free_polygon(pres);
free(pres);
return Py_BuildValue("i", ((r > 0) ? 1 : 0));
}
static PyObject *Polygon_covers(Polygon *self, Polygon *other) {
double x0, x1, y0, y1, X0, X1, Y0, Y1;
gpc_polygon * pres;
int r;
if (! Polygon_Check(other))
return Polygon_Raise(ERR_ARG);
Polygon_getBoundingBox(self, &x0, &x1, &y0, &y1);
Polygon_getBoundingBox(other, &X0, &X1, &Y0, &Y1);
/* first test if bounding box covers other boundingbox */
if ((X0 < x0) || (X1 > x1) || (Y0 < y0) || (Y1 > y1))
Py_RETURN_FALSE;
/* still there? Let's do the full test... */
if (! (pres = poly_p_new())) return Polygon_Raise(ERR_MEM);
gpc_polygon_clip(GPC_DIFF, other->gpc_p, self->gpc_p, pres);
r = pres->num_contours;
gpc_free_polygon(pres);
free(pres);
if (r > 0)
Py_RETURN_FALSE;
else
Py_RETURN_TRUE;
}
