static public Figure get_Icosahedron(float sz)
{
Figure res = new Figure();
float ang = (float)(Math.PI / 5);
bool is_upper = true;
int ind = 0;
float a = 0;
for (int i = 0; i < 10; ++i)
{
res.points.Add(new Point3D((float)Math.Cos((float)a), (float)Math.Sin((float)a), is_upper ? (float)0.5 : (float)-0.5));
is_upper = !is_upper;
ind++;
a += ang;
}
Side s;
for (int i = 0; i < ind; i++)
{
s = new Side(res);
if (i % 2 == 0)
{
s.points.AddRange(new int[] { i, (i + 1) % ind, (i + 2) % ind });
// s.drawing_pen = new Pen(Color.Green);
}
else
{
s.points.AddRange(new int[] { (i + 2) % ind, (i + 1) % ind, i });
// s.drawing_pen = new Pen(Color.Red);
}
res.sides.Add(s);
}
res.points.Add(new Point3D(0, 0, (float)Math.Sqrt(5) / 2)); // ind
res.points.Add(new Point3D(0, 0, -(float)Math.Sqrt(5) / 2)); // ind+1
for (int i = 0; i < ind; i += 2)
{
s = new Side(res);
s.points.AddRange(new int[] { i, ind, (i + 2) % ind });
s.points.Reverse();
res.sides.Add(s);
}
for (int i = 1; i < ind; i += 2)
{
s = new Side(res);
s.points.AddRange(new int[] { i, (i + 2) % ind, ind + 1 });
s.points.Reverse();
res.sides.Add(s);
}
res.scale_around_center(sz, sz, sz);
res.set_rand_color();
return(res);
}
public Side(Figure h = null)
{
host = h;
}
