/* LSystem.h
 * J Scott Cameron
 *
 * LSystems are a type of rewriting grammar.
 * Rules are given for various symbols so that
 * those symbols are replaced by strings of other symbols
 * during each iteration.
 *
 * This implementation takes a Lindenmayer system and uses a LOGO 
 * style cursor in 3d space to create geometry. The symbol "F" will 
 * cause the cursor to move forward one unti and draw a cylinder. 
 * "f" will move forward without drawing. The symbols X,x,Y,y,Z, 
 * and z all rotate the cursor by a predetermined angle in
 * that plane. "[" and "]" allow the  cursor be pushed 
 * down on a stack, this allows for branching meshes
*/
#include <d3dx8.h>
#include <iostream.h>
#include <string>
#include <map>

using namespace std;

class LSystem {
public:
	
	LSystem(); // default constructor
	
	string init; //initial string (string at iteration 0)
	map<char,string> rules; // map of replacement rules
	int iterations; // number of iterations to descend through
	
	string output(); // returns the final LSystem string
	void addRule(char,string); //adds a rule to the map
	
	void setRules(string); /*sets rules to those placed in given 
	                        *  string of format:
	                        * "<char>=<replacement string>" */
	void emptyRules(); // empties rule map
	
	string getRulesString(); // complements setRules() for Dialog box
	
	void setInit(string);//sets the initial string 
	void setIterations(int); // sets iterations

	string replace(string,map<char,string>); 
	/*used to rewrite a string for one iteration*/

	D3DXVECTOR3 getCenter(); //not implemented - used to find Center of mesh
	
	
};