public static Point[] Sample(IList <Point> points, EllipseParams ellipse, int count = 20)
{
Contract.Requires(points != null);
Contract.Requires(points.Count > 6);
Contract.Requires(count > 0);
Contract.Ensures(Contract.Result <Point[]>() != null);
Contract.Ensures(Contract.Result <Point[]>().Length == count);
/*using (StreamWriter writer = File.CreateText("Points.txt"))
* {
* foreach (Point pnt in points)
* {
* writer.Write(pnt.X + " " + pnt.Y);
* writer.Write(writer.NewLine);
* }
* }
* MessageBox.Show("Done Writing Points");*/
/*EllipseParams ellipse = new EllipseParams
* {
* Center = new Point(0.9566, 0.8023),
* XRadius = 0.1149,
* YRadius = 0.0894,
* Degrees = -1.2418 * 180 / Math.PI
* };*/
var result = new Point[count];
var rotMatrix = new RotateTransform(ellipse.Degrees).Value;
for (int i = 0; i < count; ++i)
{
var t = 2 * Math.PI * i / (double)(count - 1);
var vec = new Vector(ellipse.XRadius * Math.Cos(t), ellipse.YRadius * Math.Sin(t));
result[i] = ellipse.Center + rotMatrix.Transform(vec);
}
return(result);
}
public static double ComputeDeviation(double[] conic, EllipseParams parametric, Point point)
{
double x = point.X;
double y = point.Y;
var a = conic[0];
var b = conic[1];
var c = conic[2];
var d = conic[3];
var e = conic[4];
var f = conic[5];
var deviation = a * x * x + b * x * y + c * y * y + d * x + e * y + f;
var size = Math.Min(parametric.XRadius, parametric.YRadius);
return(Math.Abs(deviation) / size);
}
