/// <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)
{
double radians = AngleInRadians(Centroid(points), (PointR)points[0], false); // indicative angle
ArrayList 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);
}
public override bool Equals(object obj)
{
if (obj is SizeR)
{
SizeR sz = (SizeR)obj;
return(Width == sz.Width && Height == sz.Height);
}
return(false);
}
// translates the points by the given delta amounts
public static ArrayList TranslateBy(ArrayList points, SizeR sz)
{
ArrayList newPoints = new ArrayList(points.Count);
for (int i = 0; i < points.Count; i++)
{
PointR p = (PointR)points[i];
p.X += sz.Width;
p.Y += sz.Height;
newPoints.Add(p);
}
return(newPoints);
}
// scales by the percentages contained in the 'sz' parameter. values of 1.0 would result in the
// identity scale (that is, no change).
public static ArrayList ScaleBy(ArrayList points, SizeR sz)
{
ArrayList newPoints = new ArrayList(points.Count);
RectangleR r = FindBox(points);
for (int i = 0; i < points.Count; i++)
{
PointR p = (PointR)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)
{
ArrayList newPoints = new ArrayList(points.Count);
RectangleR r = FindBox(points);
for (int i = 0; i < points.Count; i++)
{
PointR p = (PointR)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;
}
