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Circular Linegraph of Daily Temperatures

The Polar chart (also known as the Radar chart) may be used in several ways to handle cyclic timeseries or comparisons on many dimensions. This chart copies the typical pen-recorder often seen in computer rooms to track temperature and humidity.

The data values become radii, and time is plotted around the circle as a 24-hour clock – the x-tickmarks are given in hours here. X-zones may be used to indicate times of day.

SharpPlot sp = new SharpPlot;

sp.Heading = "Daily Temperatures\nin Iceland";
sp.HeadingStyle = HeadingStyles.Left;
sp.SetMargins(48,12,12,0);

times = new double[] {0.8,2.3,3.8,5.3,6.8,8.3,9.8,11.3,12.8,14.3,15.8,17.3,18.8,
         20.3,21.8,23.3};
temps = new double[] {4.4,4.4,4.4,4.8,4.4,4.4,4.8,5.6,6,6,6,6.4,6.4,6.8,6.4,6.4};

sp.SetYRange(0,8);
sp.SetYTickMarks(2);
sp.SetXTickMarks(3,2);

sp.YLabelFormat = "#0°";

sp.YCaption = "Deg C";
sp.SetColors(Color.Red);
sp.SetPenWidths(1.5);

sp.SetXZones(new Zone(10,17,Color.SkyBlue,FillStyle.Dome));

sp.PolarChartStyle = PolarChartStyles.ClockFace|PolarChartStyles.GridLines|
         PolarChartStyles.Curves|PolarChartStyles.HollowCenter;
sp.DrawPolarChart(temps,times);

Worked Examples

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