protected virtual void Setup()
{
var resampled = PointsHelpers.Resample(OriginalPoints, PointsHelpers.NumPoints);
var radians = PointsHelpers.IndicativeAngle(resampled);
var rotated = PointsHelpers.RotateBy(resampled, -radians);
var scaled = PointsHelpers.ScaleTo(rotated, PointsHelpers.SquareSize);
Points = PointsHelpers.TranslateTo(scaled, PointsHelpers.Origin);
Vector = PointsHelpers.Vectorize(Points); // for Protractor
}
public Result Recognize(List <Point> points, bool useProtractor = true)
{
if (points.Count < 4)
{
return(Result.TooFewPoints());
}
Rectangle rect = PointsHelpers.BoundingBox(points);
points = PointsHelpers.Resample(points, PointsHelpers.NumPoints);
var radians = PointsHelpers.IndicativeAngle(points);
points = PointsHelpers.RotateBy(points, -radians);
points = PointsHelpers.ScaleTo(points, PointsHelpers.SquareSize);
points = PointsHelpers.TranslateTo(points, PointsHelpers.Origin);
var vector = PointsHelpers.Vectorize(points); // for Protractor
var b = Double.PositiveInfinity;
var u = -1;
for (var i = 0; i < this.Unistrokes.Count; i++) // for each unistroke
{
double d;
if (useProtractor) // for Protractor
{
d = PointsHelpers.OptimalCosineDistance(this.Unistrokes[i].Vector, vector);
}
else // Golden Section Search (original $1)
{
d = PointsHelpers.DistanceAtBestAngle(points, this.Unistrokes[i], -PointsHelpers.AngleRange, +PointsHelpers.AngleRange, PointsHelpers.AnglePrecision);
}
if (d < b)
{
b = d; // best (least) distance
u = i; // unistroke
}
}
return((u == -1) ?
new Result("No match.", 0.0, 0, Rectangle.Empty) :
new Result(Unistrokes[u].Name, useProtractor ? 1.0 / b : 1.0 - b / PointsHelpers.HalfDiagonal, radians, rect));
}