/// <summary>
/// Recursively generates the wedges for each node in the hierarchical value tree.
/// </summary>
/// <param name="node">The node from which to create a wedge.</param>
/// <param name="innerRadius">The inner radius of the wedge.</param>
/// <param name="radius">The radius length (poor naming!).</param>
/// <param name="arc">The arc of the wedge.</param>
/// <param name="rotationalAngle">The rotational angle of the wedge (rotational transform, essentially).</param>
private void generate(HierarchicalValue node, double innerRadius, double radius, double arc, double rotationalAngle)
{
Wedge wedge = new Wedge();
wedge.center = center;
wedge.innerRadius = innerRadius;
wedge.outerRadius = innerRadius + radius;
wedge.sweep = arc;
wedge.rotationAngle = rotationalAngle;
//use a default black stroke around each wedge
wedge.Stroke = System.Windows.Media.Brushes.Black;
wedge.StrokeThickness = 0.5;
wedge.Fill = brushes[node.tag]; //lookup the unique color based on the tag for this node
wedge.ToolTip = node.name;
wedges.Add(wedge);
//arc percentage for children...
var h = rotationalAngle;
if (rotationalAngle < 180.0)
{
//create wedges for all of the children of this node
foreach (HierarchicalValue child in node.children)
{
//sweep is related to the value the child contributes to the parent value
var angle = arc * (child.totalValues() / (node.totalValues() - node.value));
generate(child, wedge.outerRadius, radius, angle, h);
h += angle; //advance around the parent's arc
}
}
else {
// Process in reverse order
//create wedges for all of the children of this node
for(int i = node.children.Count - 1;i >= 0;i--)
{
HierarchicalValue child = node.children[i];
//sweep is related to the value the child contributes to the parent value
var angle = arc * (child.totalValues() / (node.totalValues() - node.value));
generate(child, wedge.outerRadius, radius, angle, h);
h += angle; //advance around the parent's arc
}
}
}
