// Make pie slices.
private void MakeCircleChart(Point3D center, double r1, double r2,
double height, double[] values, Brush[] brushes, int numPieces, Model3DGroup group)
{
// Calculate percentages.
double total = values.Sum();
int numValues = values.Length;
double[] percents = new double[numValues];
for (int i = 0; i < numValues; i++)
{
percents[i] = values[i] / total;
}
// Draw slices.
double minTheta = 0;
for (int i = 0; i < numValues; i++)
{
double maxTheta = minTheta + 360.0 * percents[i];
MeshGeometry3D mesh = new MeshGeometry3D();
int slicePieces = (int)(numPieces * percents[i]);
if (slicePieces < 2)
{
slicePieces = 2;
}
mesh.AddCircleSlice(center, height, minTheta, maxTheta,
r1, r2, slicePieces);
group.Children.Add(mesh.MakeModel(brushes[i]));
minTheta = maxTheta;
}
}