public class bit
    {
        System.Drawing.Graphics zona_des;
        System.Drawing.SolidBrush pens_bit;
        System.Drawing.Bitmap img;
        Graphics g;
        System.Drawing.Pen creion_contur = new System.Drawing.Pen(System.Drawing.Color.Blue);
        System.Drawing.SolidBrush pens_stins = new System.Drawing.SolidBrush(System.Drawing.Color.Gray);
        System.Drawing.SolidBrush pens_rad = new System.Drawing.SolidBrush(System.Drawing.Color.White);
        int x0;		// pozitia pe x a bitului
        int y0;		// pozitia pe y a bitului
        int wd;	    // latimea
        int tp;     // tipul formei de afisat
        public bit(System.Drawing.Graphics desen, int x, int y, int wi, int tip, System.Drawing.SolidBrush culoare_bit)
        {
            zona_des = desen;
            pens_bit = culoare_bit; // culoarea cu care va fi desenta bitul
            x0 = x; 		    // pozitia pe x a bitului
            y0 = y;	    	    // pozitia pe y a bitului
            wd = wi;    	    // latimea
            tp = tip;           // tipul formei de afisat
                                // 1=cerc
                                // 2=patrat
                                // 3=sageata stanga
                                // 4=sageata dreapta
                                // 5=sageata jos
                                // 6=sageata sus
        }
        public void setval(bool val)
        {
            img = new Bitmap(wd + 2, wd + 2, zona_des);
            g = Graphics.FromImage(img);

            // sterg continutul imaginii
            g.FillRectangle(pens_rad, 0, 0, wd + 2, wd + 2);

            // desenez bit
            
            // cerc
            if (tp == 1)
            {
                // umplere cerc
                if (val)
                    g.FillEllipse(pens_bit, 0, 0, wd, wd);
                else
                    g.FillEllipse(pens_stins, 0, 0, wd, wd);
                // trasare conturn 
                g.DrawEllipse(creion_contur, 0, 0, wd, wd);
            }

            // patrat
            if (tp == 2) 
            {
                // umplere patrat
                if (val)
                    g.FillRectangle(pens_bit, 0, 0, wd, wd);
                else
                    g.FillRectangle(pens_stins, 0, 0, wd, wd);
                // trasare conturn 
                g.DrawRectangle(creion_contur, 0, 0, wd, wd);
            }

            // sageata stanga
            if (tp == 3)    
            {
                Point p1 = new Point(wd / 2, 0);
                Point p2 = new Point(wd / 2, wd / 4);
                Point p3 = new Point(wd, wd / 4);
                Point p4 = new Point(wd,  wd * 3 / 4);
                Point p5 = new Point(wd / 2, wd * 3 / 4);
                Point p6 = new Point(wd/2, wd );
                Point p7 = new Point(0, wd / 2);

                Point[] puncte = { p1, p2, p3, p4, p5, p6, p7};
                // umplere poligon
                if (val)
                    g.FillPolygon(pens_bit, puncte);
                else
                    g.FillPolygon(pens_stins, puncte);
                // trasare conturn poligon
                g.DrawPolygon(creion_contur, puncte);
            }

            // sageata dreapta
            if (tp == 4) 
            {
                Point p1 = new Point(0, wd / 4);
                Point p2 = new Point(wd / 2, wd / 4);
                Point p3 = new Point(wd / 2, 0);
                Point p4 = new Point(wd, wd / 2);
                Point p5 = new Point(wd / 2, wd);
                Point p6 = new Point(wd / 2, wd * 3 / 4);
                Point p7 = new Point(0, wd * 3 / 4);
                Point[] puncte = { p1, p2, p3, p4, p5, p6, p7 };

                // umplere poligon
                if (val)
                    g.FillPolygon(pens_bit, puncte);
                else
                    g.FillPolygon(pens_stins, puncte);
                // trasare conturn poligon
                g.DrawPolygon(creion_contur, puncte);
            }

            // sageata jos
            if (tp == 5)
            {
                Point p1 = new Point(wd  / 4, 0);
                Point p2 = new Point(wd * 3 / 4, 0);
                Point p3 = new Point(wd * 3 / 4, wd/2);
                Point p4 = new Point(wd, wd/2);
                Point p5 = new Point(wd / 2, wd);
                Point p6 = new Point(0,wd / 2);
                Point p7 = new Point(wd/4, wd/2);
                Point[] puncte = { p1, p2, p3, p4, p5, p6, p7 };

                // umplere poligon
                if (val)
                    g.FillPolygon(pens_bit, puncte);
                else
                    g.FillPolygon(pens_stins, puncte);
                // trasare conturn poligon
                g.DrawPolygon(creion_contur, puncte);
            }
            // sageata sus
            if (tp == 6)
            {
                Point p1 = new Point(0,wd / 2);
                Point p2 = new Point(wd /2, 0);
                Point p3 = new Point(wd, wd / 2);
                Point p4 = new Point(wd*3/4, wd / 2);
                Point p5 = new Point(wd *3/4, wd);
                Point p6 = new Point(wd/4, wd);
                Point p7 = new Point(wd / 4, wd / 2);
                Point[] puncte = { p1, p2, p3, p4, p5, p6, p7 };

                // umplere poligon
                if (val)
                    g.FillPolygon(pens_bit, puncte);
                else
                    g.FillPolygon(pens_stins, puncte);
                // trasare conturn poligon
                g.DrawPolygon(creion_contur, puncte);
            }
            // plasez imaginea finala
            zona_des.DrawImage(img, x0, y0);
        }
    }