private void Form1_MouseClick(object sender, MouseEventArgs e)
{
if (size != 0)
{
g = CreateGraphics();
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
Aa[iter] = new Point(PointToClient(Control.MousePosition).X, PointToClient(Control.MousePosition).Y);
g.FillEllipse(Brushes.DarkBlue, Aa[iter].X - 3, Aa[iter].Y - 3, 6, 6);
iter++;
if (iter >= size && iter >= 3)
{
int j = 1, i = 0;
List <Point> S = new List <Point>();
S = ConvexHull(Aa.ToList());
while (j < S.Count() && (S[j].X != 0 || S[j].Y != 0))
{
j++;
}
Point[] polygon = new Point[j];
for (i = 0; i < j; i++)
{
polygon[i] = S[i];
}
g.FillPolygon(Brushes.Violet, polygon);
for (i = 0; i < size; i++)
{
g.FillEllipse(Brushes.DarkBlue, Aa[i].X - 3, Aa[i].Y - 3, 6, 6);
}
iter = 0;
List <MyPoint> points;
points = new List <MyPoint>();
for (i = 0; i < S.Count(); i++)
{
MyPoint m = new MyPoint();
m.id = i;
m.point = S[i];
points.Add(m);
}
MyPoint A = points[0], B = points[1], C = points[2];
MyPoint bA = (MyPoint)A.Clone(), bB = (MyPoint)B.Clone(), bC = (MyPoint)C.Clone();
while (true)
{
while (true)
{
while (true)
{
if (C.id != points.Count() - 1)
{
MyPoint nextC = points[C.id + 1];
if (area(A.point, B.point, C.point) < area(A.point, B.point, nextC.point))
{
C = nextC;
}
else
{
break;
}
}
else
{
break;
}
}
if (B.id != points.Count() - 1)
{
MyPoint nextB = points[B.id + 1];
if (area(A.point, B.point, C.point) < area(A.point, nextB.point, C.point))
{
B = nextB;
}
else
{
break;
}
}
else
{
break;
}
}
if (area(A.point, B.point, C.point) > area(bA.point, bB.point, bC.point))
{
bA = A; bB = B; bC = C;
}
if (A.id != points.Count() - 1)
{
A = points[A.id + 1];
}
else
{
A = points[0];
}
if (A.point == B.point)
{
if (B.id != points.Count() - 1)
{
B = points[B.id + 1];
}
}
if (B.point == C.point)
{
if (C.id != points.Count() - 1)
{
C = points[C.id + 1];
}
}
if (A.id == 0)
{
break;
}
}
g.FillEllipse(Brushes.Yellow, bA.point.X - 3, bA.point.Y - 3, 6, 6);
g.FillEllipse(Brushes.Yellow, bB.point.X - 3, bB.point.Y - 3, 6, 6);
g.FillEllipse(Brushes.Yellow, bC.point.X - 3, bC.point.Y - 3, 6, 6);
Pen pen = new Pen(Color.Green, 1);
g.DrawLine(pen, bA.point, bB.point);
g.DrawLine(pen, bB.point, bC.point);
g.DrawLine(pen, bC.point, bA.point);
}
}
}
