Example4_6.DataSeries.AddPie C# (CSharp) Method

        public void AddPie(Graphics g, ChartStyle cs)
        {
            SolidBrush aBrush = new SolidBrush(Color.Black);
            Pen aPen = new Pen(BorderColor);
            int nData = DataList.Count;
            float fSum = 0;
            for (int i = 0; i < nData; i++)
            {
                fSum = fSum + (float)DataList[i];
            }
            float startAngle = 0;
            float sweepAngle = 0;
            Rectangle rect = cs.SetPieArea();

            for (int i = 0; i < nData; i++)
            {
                Color fillColor = Color.FromArgb(CMap[i, 0], CMap[i, 1],
                    CMap[i, 2], CMap[i, 3]);
                aBrush = new SolidBrush(fillColor);
                int explode = (int)ExplodeList[i];

                if (fSum < 1)
                {
                    startAngle = startAngle + sweepAngle;
                    sweepAngle = 360 * (float)DataList[i];
                }
                else if (fSum >= 1)
                {
                    startAngle = startAngle + sweepAngle;
                    sweepAngle = 360 * (float)DataList[i] / fSum;

                }

                int xshift = (int)(explode * Math.Cos((startAngle +
                    sweepAngle / 2) * Math.PI / 180));
                int yshift = (int)(explode * Math.Sin((startAngle +
                    sweepAngle / 2) * Math.PI / 180));
                Rectangle rect1 = new Rectangle(rect.X + xshift, rect.Y + yshift,
                    rect.Width, rect.Height);
                g.FillPie(aBrush, rect1, startAngle, sweepAngle);
                g.DrawPie(aPen, rect1, startAngle, sweepAngle);
            }
        }

        private void PlotPanelPaint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;

            g.SmoothingMode = SmoothingMode.AntiAlias;
            AddData();
            ds.AddPie(g, cs);
            lg.AddLegend(g, ds, cs);
        }