static CCurve MakeCCurve(const geoff_geometry::Kurve& k)
{
CCurve c;
int n = k.nSpans();
for(int i = 0; i<= n; i++)
{
geoff_geometry::spVertex spv;
k.Get(i, spv);
c.append(CVertex(spv.type, Point(spv.p.x, spv.p.y), Point(spv.pc.x, spv.pc.y)));
}
return c;
}
static CArea make_obround(const Point& p0, const Point& p1, double radius)
{
Point dir = p1 - p0;
double d = dir.length();
dir.normalize();
Point right(dir.y, -dir.x);
CArea obround;
CCurve c;
if(fabs(radius) < 0.0000001)radius = (radius > 0.0) ? 0.002 : (-0.002);
Point vt0 = p0 + right * radius;
Point vt1 = p1 + right * radius;
Point vt2 = p1 - right * radius;
Point vt3 = p0 - right * radius;
c.append(vt0);
c.append(vt1);
c.append(CVertex(1, vt2, p1));
c.append(vt3);
c.append(CVertex(1, vt0, p0));
obround.append(c);
return obround;
}