Example4_8.ChartStyle.SetPolarAxes C# (CSharp) Method

        public void SetPolarAxes(Graphics g)
        {
            Pen aPen = new Pen (AngleColor, AngleThickness);
            SolidBrush aBrush = new SolidBrush (TickFontColor);
            StringFormat sFormat = new StringFormat ();
            Rectangle rect = SetPolarArea ();
            float xc = rect.X + rect.Width / 2;
            float yc = rect.Y + rect.Height / 2;

            // Draw circles:
            float dr = RNorm (RMax / NTicks) - RNorm (RMin / nTicks);
            aPen.DashStyle = AnglePattern;
            for (int i = 0; i < NTicks; i++) {
                RectangleF rect1 = new RectangleF (xc - (i + 1) * dr,
                    yc - (i + 1) * dr, 2 * (i + 1) * dr, 2 * (i + 1) * dr);
                g.DrawEllipse (aPen, rect1);
            }

            // Draw radii:
            aPen = new Pen (RadiusColor, RadiusThickness);
            aPen.DashStyle = RadiusPattern;
            for (int i = 0; i < (int)360 / AngleStep; i++) {
                float x = RNorm (RMax) * (float)Math.Cos (i * AngleStep *
                    Math.PI / 180) + xc;
                float y = RNorm (RMax) * (float)Math.Sin (i * AngleStep *
                    Math.PI / 180) + yc;
                g.DrawLine (aPen, xc, yc, x, y);
            }

            // Draw the radius labels:
            for (int i = 1; i <= nTicks; i++) {
                float rlabel = RMin + i * (RMax - RMin) / NTicks;
                sFormat.Alignment = StringAlignment.Near;
                g.DrawString (rlabel.ToString (), TickFont, aBrush,
                    new PointF (xc, yc - i * dr + 5), sFormat);
            }

            // Draw the angle labels:
            SizeF tickFontSize = g.MeasureString ("A", TickFont);
            float angleLabel = 0;
            for (int i = 0; i < (int)360 / AngleStep; i++) {
                if (AngleDirection == AngleDirectionEnum.ClockWise) {
                    angleLabel = i * AngleStep;
                } else if (AngleDirection == AngleDirectionEnum.CounterClockWise) {
                    angleLabel = 360 - i * AngleStep;
                    if (i == 0)
                        angleLabel = 0;
                }
                sFormat.Alignment = StringAlignment.Center;
                float x = (RNorm (RMax) + 1.2f * tickFontSize.Width) *
                    (float)Math.Cos (i * AngleStep * Math.PI / 180) + xc;
                float y = (RNorm (RMax) + 1.2f * tickFontSize.Width) *
                    (float)Math.Sin (i * AngleStep * Math.PI / 180) + yc;
                g.DrawString (angleLabel.ToString (), TickFont, aBrush,
                    new PointF (x, y - tickFontSize.Height / 2), sFormat);
            }
        }

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

            g.SmoothingMode = SmoothingMode.AntiAlias;
            AddData();
            cs.SetPolarAxes(g);
            dc.AddPolar(g, cs);
            lg.AddLegend(g, dc, cs);
            g.Dispose();
        }