public static double DistanceAtBestAngle(List <Point> points, Unistroke stroke, double a, double b, double threshold)
{
var x1 = PointsHelpers.Phi * a + (1.0 - PointsHelpers.Phi) * b;
var f1 = DistanceAtAngle(points, stroke, x1);
var x2 = (1.0 - PointsHelpers.Phi) * a + PointsHelpers.Phi * b;
var f2 = DistanceAtAngle(points, stroke, x2);
while (Math.Abs(b - a) > threshold)
{
if (f1 < f2)
{
b = x2;
x2 = x1;
f2 = f1;
x1 = Phi * a + (1.0 - Phi) * b;
f1 = DistanceAtAngle(points, stroke, x1);
}
else
{
a = x1;
x1 = x2;
f1 = f2;
x2 = (1.0 - Phi) * a + Phi * b;
f2 = DistanceAtAngle(points, stroke, x2);
}
}
return(Math.Min(f1, f2));
}
public DollarRecognizer AddGesture(Unistroke stroke, bool addReverse = false)
{
Unistrokes.Add(stroke);
if (addReverse)
{
AddReverseOfStroke(stroke);
}
return(this);
}
private void AddReverseOfStroke(Unistroke stroke)
{
var reversedPoints = new List <Point>();
for (int i = stroke.OriginalPoints.Count - 1; i >= 0; i--)
{
reversedPoints.Add(stroke.OriginalPoints[i]);
}
Unistrokes.Add(new Unistroke(stroke.Name, reversedPoints));
}
public static double DistanceAtAngle(List <Point> points, Unistroke stroke, double radians)
{
var newpoints = RotateBy(points, radians);
return(PathDistance(newpoints, stroke.Points));
}