polar/radar plots

[mehrdad]

Hi
Awsome software and very easy to program! thanks a million:)

Any plans to add support for polar or radar charts?

Thanks
Mehrdad

[John Champion]

Hi,
ZedGraph does not do polar plots directly, but there is a "RadarPointList" class that you can use instead of PointPairList. This class will translate the coordinates to polar values. Below is a sample.
John

private void CreateGraph_RadarPlot( ZedGraphControl z1 )
{
GraphPane myPane = z1.GraphPane;

RadarPointList rpl = new RadarPointList();

Random rand = new Random();

for ( int i = 0; i < 10; i++ )
{
double r = rand.NextDouble() * 10.0 + 10.0;
PointPair pt = new PointPair( PointPair.Missing, r, "r = " + r.ToString( "f1" ) );
rpl.Add( pt );
}
LineItem curve = myPane.AddCurve( "test", rpl, Color.Blue, SymbolType.Default );

for ( int i = 0; i < 10; i++ )
{
LineObj line = new ArrowObj( 0, 0, (float)rpl[i].X, (float)rpl[i].Y );
line.Color = Color.LightBlue;
line.ZOrder = ZOrder.D_BehindCurves;
myPane.GraphObjList.Add( line );
}

myPane.XAxis.MajorTic.IsAllTics = true;
myPane.XAxis.MinorTic.IsAllTics = true;
myPane.XAxis.Title.IsTitleAtCross = false;
myPane.XAxis.Cross = 0;
myPane.XAxis.Scale.IsSkipFirstLabel = true;
myPane.XAxis.Scale.IsSkipLastLabel = true;
myPane.XAxis.Scale.IsSkipCrossLabel = true;

myPane.YAxis.MajorTic.IsAllTics = true;
myPane.YAxis.MinorTic.IsAllTics = true;
myPane.YAxis.Title.IsTitleAtCross = false;
myPane.YAxis.Cross = 0;
myPane.YAxis.Scale.IsSkipFirstLabel = true;
myPane.YAxis.Scale.IsSkipLastLabel = true;
myPane.YAxis.Scale.IsSkipCrossLabel = true;
}

[imena]

Hi, what I see is that you only give the radius, but the angle is set automatically distributing the points between 0 and 360 degrees, is that right? is it possible to set both polar coordinates, radius and angle?
many thanks

[Paul Owen]

Is it at all possible to put a RadarPoint example on the examples page? This is a very cool feature of ZedGraph and shows how powerful it is, but you have to dig really really deep to find that ZedGraph can do this ...

Thanks