public Correlation(TouchPoint2 points)
{
//Account for a degenerate amount of points
if (points.Stroke.StylusPoints.Count <= 1)
{
RSquared = 0;
Slope = 0;
Intercept = 0;
VerticalLine = false;
SlopeRad = 0;
return;
}
var pointlist = points.Stroke.StylusPoints;
//Remove duplicate points
var workingList = new StylusPointCollection();
for (int i = 1; i < pointlist.Count; i++ )
{
var point1 = pointlist[i - 1];
var point2 = pointlist[i];
if (!(point1.X == point2.X && point1.Y == point2.Y))
{
workingList.Add(point1);
}
}
VerticalLine = false;
xavg = 0;
yavg = 0;
foreach (var p in workingList)
{
xavg += p.X;
yavg += p.Y;
}
xavg = xavg / workingList.Count;
yavg = yavg / workingList.Count;
double numerator = 0;
double denominator = 0;
foreach (var p in workingList)
{
numerator += (p.X - xavg) * (p.Y - yavg);
denominator += Math.Pow(p.X - xavg,2);
}
SlopeRad = Math.Atan2(numerator, denominator);
if (denominator != 0)
{
Slope = numerator / denominator;
Intercept = yavg - Slope * xavg;
}
else
{
VerticalLine = true;
}
TouchPoint2 tp = points.GetEmptyCopy();
if(workingList.Count > 0)
tp.Stroke.StylusPoints = workingList;
RSquared = CalculateRSquared(tp);
}
private ValidSetOfTouchPoints ValidateBox(TouchPoint2 points)
{
ValidSetOfTouchPoints output = new ValidSetOfTouchPoints();
int length = points.Stroke.StylusPoints.Count;
if (length < 1)
{
return output;
}
List<string> slopes = new List<string>();
TouchPoint2 newPoints = points.GetEmptyCopy();
for (int i = 0; i < length - 1; i++)
{
var point1 = points.Stroke.StylusPoints[i];
var point2 = points.Stroke.StylusPoints[i + 1];
double slope = TrigonometricCalculationHelper.GetSlopeBetweenPoints(point1, point2);
double distance = TrigonometricCalculationHelper.GetDistanceBetweenPoints(point1, point2);
string stringSlope = TouchPointExtensions.SlopeToDirection(slope);
if (distance > 0)
{
newPoints.Stroke.StylusPoints.Add(point1);
Correlation recognizer = new Correlation(newPoints);
if (Math.Abs(recognizer.RSquared) < TOLERANCE + 0.15)
{
int linelength = newPoints.Stroke.StylusPoints.Count;
double lineSlope = TrigonometricCalculationHelper.GetSlopeBetweenPoints(newPoints.Stroke.StylusPoints[1],
newPoints.Stroke.StylusPoints[linelength - 1]);
string lineStringSlope = TouchPointExtensions.SlopeToDirection(lineSlope);
slopes.Add(lineStringSlope);
newPoints = newPoints.GetEmptyCopy();
}
}
}
RectangleParser parser = new RectangleParser();
bool hasRect = parser.Advance(slopes);
if (hasRect)
{
output.Add(points);
}
return output;
}
