Steema Central

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            var plot = new Polar();
            for (int i = 0; i < 360; i++)
            {
                double x = i;
                double y = Math.Sin(x * Math.PI / 180.0) * 10.0;
                plot.Add(x, y);
            }
            plot.ShowInLegend = false;
            plot.Pointer.Visible = false;
            plot.Brush.Visible = false;
            plot.ClockWiseLabels = true; // angles increment clockwise
            plot.CircleLabels = true;
            plot.Circled = true;
            plot.RotationAngle = 90; // zero degrees is at top
            plot.AngleIncrement = 30; // 30 degrees increments
            plot.RadiusIncrement = 2;
            Chart.Series.Add(plot);

            var tool = new SeriesRegionTool();
            tool.DrawBehindSeries = true;
            tool.UseOrigin = false;
            tool.LowerBound = 260;
            tool.UpperBound = 280;            

            Color color = Colors.Orange;
            color = Color.FromArgb(128, color.R, color.G, color.B);
            tool.Color = color;

            tool.Series = plot;
            Chart.Tools.Add(tool);