protected void UpdateDiagonal()
{
min = vert.First();
max = vert.First();
foreach (PointF t in vert)
{
if (t.X < min.X)
{
min.X = t.X;
}
if (t.Y < min.Y)
{
min.Y = t.Y;
}
if (t.X > max.X)
{
max.X = t.X;
}
if (t.Y > max.Y)
{
max.Y = t.Y;
}
}
diagonal = new CSegment(min, max);
center = new PointF((min.X + max.X) / 2,
(min.Y + max.Y) / 2);
r = Math.Sqrt((min.X - max.X) * (min.X - max.X) +
(min.Y - max.Y) * (min.Y - max.Y)) / 2;
}
public Polygon()
{
vert = new List <PointF>();
min = new PointF();
max = new PointF();
diagonal = new CSegment(min, max);
center = new PointF();
}
public CSegment(CSegment seg)
{
_a = seg._a;
_b = seg._b;
_angle = seg._angle;
_color = seg.color;
center = seg.center;
r = seg.r;
}
public Polygon(Polygon pol)
{
vert = pol.vert;
min = pol.min;
max = pol.max;
diagonal = pol.diagonal;
_color = pol.color;
center = pol.center;
r = pol.r;
}
public override bool Contains(PointF p)
{
PointF end = new PointF(p.X + 99999, p.Y);
CSegment ray = new CSegment(p, end);
PointF prev = vert.Last();
int count = 0;
foreach (PointF i in vert)
{
CSegment c = new CSegment(prev, i);
PointF isctn = ray.Intersects(c);
if (c.Contains(isctn) && ray.Contains(isctn))
{
++count;
}
prev = i;
}
return(count % 2 == 1);
}
public PointF Intersects(CSegment a)
{
double k1 = Math.Tan(a.Angle);
double k2 = Math.Tan(this.Angle);
double m1 = a.A.Y - k1 * a.A.X;
double m2 = this.A.Y - k2 * this.A.X;
PointF ans = new PointF(-1, -1);
try
{
ans.X = (float)((m2 - m1) / (k1 - k2));
ans.Y = (float)(k2 * ans.X + m2);
}
catch (DivideByZeroException)
{
ans.X = 99999;
ans.Y = 99999;
}
return(ans);
}