public Contour CreateContour(DepthMap map, float left, float top)
{
if (map.FillRate < 0.01)
{
return Contour.Empty;
}
var points = this.Translate(this.tracer.GetContourPoints(map), (int)left, (int)top);
points = this.thinner.Filter(points);
return new Contour(points);
}