/// <summary>
/// Parses each child of <code>node</code> as an instruction, adds them to the specified instruction list. Calls are resolved to production lists
/// using the specified multimap.
/// </summary>
private static void ParseInstructionsFromXml(XmlNode node, List <TreeCrayonInstruction> instructions,
MultiMap <string, ProductionNodePair> map)
{
foreach (XmlNode child in node.ChildNodes)
{
switch (child.Name)
{
case "Call":
String name = XmlUtil.GetString(child, "ref");
List <Production> productions = GetProductionsByRef(name, map);
instructions.Add(new Call(productions, XmlUtil.GetInt(child, "delta", -1)));
break;
case "Child":
var ch = new Child();
ParseInstructionsFromXml(child, ch.Instructions, map);
instructions.Add(ch);
break;
case "Maybe":
var maybe = new Maybe(XmlUtil.GetFloat(child, "chance", 0.50f));
ParseInstructionsFromXml(child, maybe.Instructions, map);
instructions.Add(maybe);
break;
case "Forward":
instructions.Add(new Forward(XmlUtil.GetFloat(child, "distance"),
XmlUtil.GetFloat(child, "variation", 0.0f),
XmlUtil.GetFloat(child, "radius", 0.86f)));
break;
case "Backward":
instructions.Add(new Backward(XmlUtil.GetFloat(child, "distance"),
XmlUtil.GetFloat(child, "variation", 0.0f)));
break;
case "Pitch":
instructions.Add(new Pitch(XmlUtil.GetFloat(child, "angle"),
XmlUtil.GetFloat(child, "variation", 0.0f)));
break;
case "Scale":
instructions.Add(new Scale(XmlUtil.GetFloat(child, "scale"),
XmlUtil.GetFloat(child, "variation", 0.0f)));
break;
case "ScaleRadius":
instructions.Add(new ScaleRadius(XmlUtil.GetFloat(child, "scale"),
XmlUtil.GetFloat(child, "variation", 0.0f)));
break;
case "Twist":
instructions.Add(new Twist(XmlUtil.GetFloat(child, "angle", 0),
XmlUtil.GetFloat(child, "variation", 360.0f)));
break;
case "Level":
instructions.Add(new Level(XmlUtil.GetInt(child, "delta", -1)));
break;
case "Leaf":
instructions.Add(ParseLeafFromXml(child));
break;
case "Bone":
instructions.Add(new Bone(XmlUtil.GetInt(child, "delta", -1)));
break;
case "RequireLevel":
String type = XmlUtil.GetStringOrNull(child, "type");
CompareType ctype = type == "less" ? CompareType.Less : CompareType.Greater;
var req = new RequireLevel(XmlUtil.GetInt(child, "level"), ctype);
ParseInstructionsFromXml(child, req.Instructions, map);
instructions.Add(req);
break;
case "Align":
instructions.Add(new Align());
break;
}
}
}
/// <summary>
/// Creates a tree generator from a specified XML document.
/// </summary>
/// <param name="document">The XML document to parse.</param>
/// <returns>A new tree generator.</returns>
/// <exception cref="ArgumentException">If the XML document is not a valid tree specification.</exception>
public static TreeGenerator CreateFromXml(XmlDocument document)
{
var generator = new TreeGenerator();
string rootName = null;
int levels = -1;
int boneLevels = 3;
var productions = new MultiMap <string, ProductionNodePair>();
XmlNode root = document.SelectSingleNode("Tree");
foreach (XmlNode child in root.ChildNodes)
{
switch (child.Name)
{
case "Root":
rootName = XmlUtil.GetString(child, "ref");
break;
case "Levels":
levels = XmlUtil.GetInt(child, "value");
break;
case "BoneLevels":
boneLevels = XmlUtil.GetInt(child, "value");
break;
case "LeafAxis":
generator.LeafAxis = XmlUtil.GetVector3(child, "value");
generator.LeafAxis.Value.Normalize();
break;
case "Production":
string name = XmlUtil.GetString(child, "id");
productions.Add(name, new ProductionNodePair(new Production(), child));
break;
case "ConstrainUnderground":
generator.Constraints.Constaints.Add(
new ConstrainUndergroundBranches(XmlUtil.GetFloat(child, "lowerBound", 256.0f)));
break;
case "TextureHeight":
generator.TextureHeight = XmlUtil.GetFloat(child, "height");
generator.TextureHeightVariation = XmlUtil.GetFloat(child, "variation", 0.0f);
break;
}
}
if (rootName == null)
{
throw new ArgumentException("Root name must be specified.");
}
// Now we have a map of names -> productions, so we can start parsing the the productions
foreach (ProductionNodePair pn in productions.Values)
{
ParseInstructionsFromXml(pn.Node, pn.Production.Instructions, productions);
}
generator.Root = productions[rootName][0].Production;
generator.MaxLevel = levels;
generator.BoneLevels = boneLevels;
return(generator);
}