/**
* Test if we have a circle; inertia has been precomputed by caller
*/
double CircleRecognizer::scoreCircle(Stroke* s, Inertia& inertia)
{
if (inertia.getMass() == 0.0)
{
return 0;
}
double sum = 0.0;
double x0 = inertia.centerX();
double y0 = inertia.centerY();
double r0 = inertia.rad();
ArrayIterator<Point> it = s->pointIterator();
if (!it.hasNext())
{
return 0;
}
Point p1 = it.next();
while (it.hasNext())
{
Point p2 = it.next();
double dm = hypot(p2.x - p1.x, p2.y - p1.y);
double deltar = hypot(p1.x - x0, p1.y - y0) - r0;
sum += dm * fabs(deltar);
p1 = p2;
}
return sum / (inertia.getMass() * r0);
}
Stroke* CircleRecognizer::recognize(Stroke* stroke)
{
Inertia s;
s.calc(stroke->getPoints(), 0, stroke->getPointCount());
RDEBUG("Mass=%.0f, Center=(%.1f,%.1f), I=(%.0f,%.0f, %.0f), Rad=%.2f, Det=%.4f",
s.getMass(), s.centerX(), s.centerY(), s.xx(), s.yy(), s.xy(), s.rad(), s.det());
if (s.det() > CIRCLE_MIN_DET)
{
double score = CircleRecognizer::scoreCircle(stroke, s);
RDEBUG("Circle score: %.2f", score);
if (score < CIRCLE_MAX_SCORE)
{
return CircleRecognizer::makeCircleShape(stroke, s);
}
}
return NULL;
}