public class ser
    {
        System.Drawing.Graphics zona_des;
        int x0;       //pozitia pe x
        int y0;       //pozitia pe y
        int w;        //latimea
        int wp;       //latimea pistonului
        int h;        //inaltimea
        double val_max;  //valoarea maxima
        double val_min;  //valoarea minima
        public void desenez(System.Drawing.Color culoare_contur, System.Drawing.Color culoare_gradatii, System.Drawing.Color culoare_valori)
        {
            System.Drawing.Pen creion_contur = new System.Drawing.Pen(culoare_contur);
            System.Drawing.Pen creion_gradatii = new System.Drawing.Pen(culoare_gradatii);
            System.Drawing.SolidBrush pens_valori = new System.Drawing.SolidBrush(culoare_valori);
            System.Drawing.Font font_ni = new System.Drawing.Font("Nina", 8);
            zona_des.DrawRectangle(creion_contur, x0, y0, w+wp, h);
            for (int i = 0; i <= w; i += 5)// desenez gradatii
            {
                if (i % 25 == 0)
                {
                    zona_des.DrawLine(creion_gradatii, x0 + i, y0 + h+12, x0 + i, y0 + h+1);
                    zona_des.DrawString(System.Convert.ToString(val_min + (int) (i * (val_max - val_min) / w)), font_ni, pens_valori, x0+i-5, y0 + h+15);
                }
                else
                {
                    zona_des.DrawLine(creion_gradatii, x0 + i, y0 + h+1, x0 + i, y0 + h+7);
                }
            }
        }
        public void setval(double val, System.Drawing.Color culoare_ser, System.Drawing.Color culoare_piston, System.Drawing.Color culoare_radiera)
        {
            System.Drawing.SolidBrush pens_ser = new System.Drawing.SolidBrush(culoare_ser);
            System.Drawing.SolidBrush pens_piston = new System.Drawing.SolidBrush(culoare_piston);
            System.Drawing.SolidBrush rad = new System.Drawing.SolidBrush(culoare_radiera);
            zona_des.FillRectangle(rad, x0 + 1, y0 + 1, w+wp-1, h - 1);
            if (val > val_max)
                val = val_max;
            if (val < val_min)
                val = val_min;
            int vl = System.Convert.ToInt16(System.Convert.ToDouble(val - val_min) * (System.Convert.ToDouble(w) / System.Convert.ToDouble(val_max - val_min))); //scalare
            zona_des.FillRectangle(pens_ser, x0 + 1, y0 + 1, vl, h-1);
            zona_des.FillRectangle(pens_piston, x0+1 + vl, y0+1, wp-2, h-1);
            zona_des.FillRectangle(pens_piston, x0+1 + vl, y0+1 + h / 2-1, w-vl+wp, 2);
        }
        public ser(System.Drawing.Graphics desen, int pozx, int pozy, int lat, int inalt, int w_piston, double vmin, double vmax)
        {
            zona_des = desen;
            x0 = pozx;
            y0 = pozy;
            w = lat;
            wp = w_piston;
            h = inalt;
            val_max = vmax;
            val_min = vmin;
        }
    }