using System;

using System.Collections.Generic;

using System.Text;

using CsGL.Basecode;

using System.Drawing;

namespace Lab3

{

class OpenGL:Model

{

public override void Initialize()

{

base.Initialize();

}

public override void Draw()

{

base.Draw();

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glColor3f(1,0,1);

glPointSize(3);

glBegin(GL_POINTS);

//BRLine(new Point(10, 100), new Point(200, 100));

Point O = new Point(90, 55);

Circle(O, 100);

for (int i = -200; i <= 200; i++)

{

glVertex2i(0, i);

glVertex2i(i, 0);

}

ToMauDgTron();

glVertex2i(100, 100);

glEnd();

}

private void ToMauDgTron()

{

//throw new Exception("The method or operation is not implemented.");

}

public static void Circle(Point O, int R)

{

int x, y, d;

x = 0; y = R;

d = 1 - R;

CirclePoints(new Point(x, y), O);

while (y > x)

{

if (d < 0)

{

d += 2 * x + 3;

}

else

{

d += 2 * (x - y) + 5;

y--;

}

x++;

CirclePoints(new Point(x, y), O);

}

}

public static void CirclePoints(Point P,Point O)

{

glVertex2i(P.X + O.X, P.Y +O.Y );

glVertex2i(P.Y + O.X, P.X + O.Y);

glVertex2i(-P.X + O.X, -P.Y + O.Y);

glVertex2i(-P.Y + O.X, -P.X + O.Y);

glVertex2i(-P.X + O.X, P.Y + O.Y);

glVertex2i(-P.Y + O.X, P.X + O.Y);

glVertex2i(P.X + O.X, -P.Y + O.Y);

glVertex2i(P.Y + O.X, -P.X + O.Y);

}

public static void ToMauDgTron(Point P, Point O)

{

BRLine(new Point( P.X, P.Y ),new Point(-P.X, P.Y));

BRLine(new Point( P.Y, P.X),new Point(-P.Y, P.X));

BRLine(new Point(-P.X, -P.Y),new Point(-P.X, -P.Y));

BRLine(new Point(-P.Y, -P.X), new Point(-P.Y, -P.X));

}

public static void BRLine(Point a, Point b)

{

int x = a.X, y = a.Y, x1 = b.X - a.X, y1 = b.Y - a.Y, p = 2 * y1 - x1;

while (x<= b.X)

{

glVertex2i(x, y);

if (p <= 0) p += 2 * y1;

else

{

y++;

p += 2 * y1 - 2 * x1;

}

x++;

}

}

}

}