/// <summary>
/// Scales the bounding box defined by a set of points after first rotating that set
/// such that the angle from centroid-to-first-point is zero degrees. After scaling,
/// the points are rotated back by the same angle.
/// </summary>
/// <param name="points"></param>
/// <param name="sz"></param>
/// <returns></returns>
//public static ArrayList ScaleOrientedTo(ArrayList points, SizeR sz)
public static List <PointR> ScaleOrientedTo(List <PointR> points, SizeR sz)
{
var radians = AngleInRadians(Centroid(points), points[0], false); // indicative angle
//ArrayList newpoints = RotateByRadians(points, -radians); // rotate so that centroid-to-point[0] is 0 deg.
var newpoints = RotateByRadians(points, -radians); // rotate so that centroid-to-point[0] is 0 deg.
newpoints = ScaleTo(newpoints, sz);
newpoints = RotateByRadians(newpoints, +radians); // restore orientation
return(newpoints);
}
// translates the points by the given delta amounts
//public static ArrayList TranslateBy(ArrayList points, SizeR sz)
public static List <PointR> TranslateBy(List <PointR> points, SizeR sz)
{
//ArrayList newPoints = new ArrayList(points.Count);
var newPoints = new List <PointR>(points.Count);
for (var i = 0; i < points.Count; i++)
{
var p = points[i];
p.X += sz.Width;
p.Y += sz.Height;
newPoints.Add(p);
}
return(newPoints);
}
// scales the points so that they form the size given. does not restore the
// origin of the box.
//public static ArrayList ScaleTo(ArrayList points, SizeR sz)
public static List <PointR> ScaleTo(List <PointR> points, SizeR sz)
{
//ArrayList newPoints = new ArrayList(points.Count);
var newPoints = new List <PointR>(points.Count);
var r = FindBox(points);
for (var i = 0; i < points.Count; i++)
{
var p = points[i];
if (r.Width != 0.0)
{
p.X *= (sz.Width / r.Width);
}
if (r.Height != 0.0)
{
p.Y *= (sz.Height / r.Height);
}
newPoints.Add(p);
}
return(newPoints);
}
// copy constructor
public SizeR(SizeR sz)
{
_cx = sz.Width;
_cy = sz.Height;
}