/**
* Calculate the feature area error of the ellipse
*
* @return feature area error
*/
protected double calcFeatureArea()
{
double err1 = FeatureArea.toPoint(recognizer.getPoints(), m_center);
err1 /= (Math.PI * (m_minorAxisLength / 2.0) * (m_majorAxisLength / 2.0));
err1 = Math.Abs(1.0 - err1);
if (Double.IsInfinity(err1) || Double.IsNaN(err1))
{
err1 = M_ELLIPSE_FEATURE_AREA * 10.0;
}
return(err1);
}
public void FitTest(Recognizer m_features, bool useEndpoints = false)
{
// if only two points then we have a line with no error
if (m_features.getNumPoints() <= 2)
{
//log.debug("LineFit: stroke contains " + m_features.getNumPoints()
// + " points");
m_err = 0.0;
m_lsqe = 0.0;
m_passed = true;
return;
}
// ideal line (just connect the endpoints)
if (useEndpoints)
{
m_shape = new Line2D.Double(m_features.getFirstOrigPoint().X,
m_features.getFirstOrigPoint().Y, m_features
.getLastOrigPoint().X, m_features
.getLastOrigPoint().Y);
}
else
{
m_shape = m_features.getMajorAxis();
}
// test 1: least squares error between the stroke points and the line
// formed by the endpoints
m_lsqe = LeastSquares.error(m_features.getPoints(), (Line2D)m_shape);
m_ratio = m_features.getEndptStrokeLengthRatio();
if (m_features.getStrokeLength() > 25.0)
{
if (m_lsqe / m_features.getStrokeLength() > 1.4)
{
m_passed = false;
m_fail = 0;
// if line test was close and endpt ratio is high then go ahead
// and pass
if (m_lsqe / m_features.getStrokeLength() < M_LINE_LS_ERROR_FROM_ENDPTS + 0.1 &&
m_ratio > 0.98)
{
m_passed = true;
}
}
if (m_lsqe / m_features.getStrokeLength() > 1.25 && m_ratio < 0.75 &&
m_features.getNumRevolutions() <= 0.5)
{
m_passed = false;
m_fail = 1;
}
}
else
{
if (m_lsqe / m_features.getStrokeLength() > 1.5 && m_ratio < 0.732)
{
m_passed = false;
m_fail = 2;
}
if (m_lsqe / m_features.getStrokeLength() > 1.25 && m_ratio < 0.7 &&
m_features.getNumRevolutions() < 0.15)
{
m_passed = false;
m_fail = 3;
}
}
// test 2: verify that stroke is not overtraced
if (m_features.isOvertraced())
{
m_passed = false;
m_fail = 4;
}
// test 3: test feature area (use as error for fit)
m_err = FeatureArea.toLine(m_features.getPoints(), (Line2D)m_shape)
/ m_features.getStrokeLength();
if (m_err > M_LINE_FEATURE_AREA)
{
m_passed = false;
m_fail = 5;
}
// test 4: ratio must be near 1.0
//if (m_ratio > 0.99) // definitely a line
// m_passed = true;
if (m_ratio < 0.3)
{ // definitely not a line
m_passed = false;
m_fail = 6;
}
lineLength = m_features.getStrokeLength();
// compute beautified shape
try
{
//computeBeautified();
}
catch (Exception e)
{
//log.error("Could not create shape object: " + e.getMessage());
}
//log.debug("LineFit: passed = " + m_passed + "(" + m_fail
// + ") least sq error = "
// + (m_lsqe / m_features.getStrokeLength()) + " overtraced = "
// + m_features.isOvertraced() + " feature area error = " + m_err
// + " endpts = (" + ((Line2D)m_shape).getX1() + ","
// + ((Line2D)m_shape).getY1() + ") ("
// + ((Line2D)m_shape).getX2() + "," + ((Line2D)m_shape).getY2()
// +
// /* ") corners = " + m_features.numFinalCorners() + */
// " best fit = (" + m_features.getBestFitLine().getX1() + ","
// + m_features.getBestFitLine().getY1() + ") ("
// + m_features.getBestFitLine().getX2() + ","
// + m_features.getBestFitLine().getY2() + ") is closed = "
// + m_features.isClosed() + " ratio = " + m_ratio + " length = "
// + m_features.getStrokeLength() + " revs = "
// + m_features.getNumRevolutions());
}
