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Gesture.cs
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Gesture.cs
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using System;
using System.Collections;
namespace WUW01
{
public class Gesture : IComparable
{
public string Name;
public ArrayList RawPoints; // raw points (for drawing) -- read in from XML
public ArrayList Points; // resampled points (for matching) -- done when loaded
public Gesture()
{
this.Name = String.Empty;
this.RawPoints = null;
this.Points = null;
}
// when a new prototype is made, its raw points are resampled into n equidistantly spaced
// points, then it is scaled to a preset size and translated to a preset origin. this is
// the same treatment applied to each candidate stroke, and it allows us to thereafter
// simply step through each point in each stroke and compare those points' distances.
// in other words, it removes the challenge of determining corresponding points in each gesture.
// after resampling, scaling, and translating, we compute the "indicative angle" of the
// stroke as defined by the angle between its centroid point and first point.
public Gesture(string name, ArrayList points)
{
this.Name = name;
this.RawPoints = new ArrayList(points); // copy (saved for drawing)
// resample first (influences calculation of centroid)
Points = Utils.Resample(points, GeometricRecognizer.NumResamplePoints);
// rotate so that the centroid-to-1st-point is at zero degrees
double radians = Utils.AngleInRadians(Utils.Centroid(Points), (PointR) Points[0], false);
Points = Utils.RotateByRadians(Points, -radians); // undo angle
// scale to a common (square) dimension
Points = Utils.ScaleTo(Points, GeometricRecognizer.ResampleScale);
// finally, translate to a common origin
Points = Utils.TranslateCentroidTo(Points, GeometricRecognizer.ResampleOrigin);
}
public int Duration
{
get
{
if (RawPoints.Count >= 2)
{
PointR p0 = (PointR) RawPoints[0];
PointR pn = (PointR) RawPoints[RawPoints.Count - 1];
return pn.T - p0.T;
}
else
{
return 0;
}
}
}
// sorts in descending order of Score
public int CompareTo(object obj)
{
if (obj is Gesture)
{
Gesture g = (Gesture) obj;
return Name.CompareTo(g.Name);
}
else
{
throw new ArgumentException("object is not a Gesture");
}
}
/// <summary>
/// Pulls the gesture name from the file name, e.g., "circle03" from "C:\gestures\circles\circle03.xml".
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string ParseName(string filename)
{
int start = filename.LastIndexOf('\\');
int end = filename.LastIndexOf('.');
return filename.Substring(start + 1, end - start - 1);
}
}
}