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|
using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using OpenSudoku.Solver;
namespace OpenSudoku.Puzzle
{
[AttributeUsage(AttributeTargets.Class,AllowMultiple=false,Inherited=true)]
public class PuzzleDescriptionAttribute : Attribute
{
public string name;
public int order;
public PuzzleDescriptionAttribute(string name,int order)
{
this.name = name;
this.order=order;
}
}
[PuzzleDescription("Unkown",-1)]
public abstract class PuzzleGenerator
{
protected static Random rnd = new Random();
protected Type solverUsed = typeof(StrategyMultipleChecks);
private SolverStrategy solver;
protected int minHoles = 50;
protected int maxHoles = 59;
public static List<Type> Puzzles()
{
List<Type> res = new List<Type>();
// Checks all the types defined within this assembly.
try
{
Assembly assembly = Assembly.GetAssembly(typeof(PuzzleGenerator));
foreach (Type type in assembly.GetTypes())
{
if (!type.IsClass || type.IsNotPublic)
continue;
if (type.BaseType == typeof(PuzzleGenerator))
res.Add(type);
}
}
catch
{
}
res.Sort(PuzzleGenerator.SortOrder);
return res;
}
public static int SortOrder(Type ta, Type tb)
{
return Order(ta)-Order(tb);
}
public static string Name(Type type)
{
PuzzleDescriptionAttribute[] attr = (PuzzleDescriptionAttribute[])type.GetCustomAttributes(typeof(PuzzleDescriptionAttribute), true);
return attr[0].name;
}
public static int Order(Type type)
{
PuzzleDescriptionAttribute[] attr = (PuzzleDescriptionAttribute[])type.GetCustomAttributes(typeof(PuzzleDescriptionAttribute), true);
return attr[0].order;
}
protected bool Resolved(int?[,] solution, int?[,] grid)
{
for (int i = 0; i < 9; i++)
for (int j = 0; j < 9; j++)
if (grid[i, j] != solution[i, j])
return false;
return true;
}
public static void CopyPuzzle(int?[,] src, int?[,] dst)
{
for (int i = 0; i < 9; i++)
for (int j = 0; j < 9; j++)
dst[i, j] = src[i, j];
}
public virtual void Generator(int?[,] solution, int?[,] puzzle)
{
int?[,] grid = new int?[9, 9];
solver = (SolverStrategy) Activator.CreateInstance(solverUsed);
SolverStrategy parentSolver = null;
if(SolverStrategy.ParentStrategy(solverUsed) != null)
parentSolver = (SolverStrategy)Activator.CreateInstance(SolverStrategy.ParentStrategy(solverUsed));
// Now we need to create a puzzle
CopyPuzzle(solution, puzzle);
// Now let's blanks some
int blanks = rnd.Next(minHoles, maxHoles);
for (int k = 0; k < blanks; k++)
{
while (true)
{
int x, y;
while (true)
{
x = rnd.Next(0, 9);
y = rnd.Next(0, 9);
if (puzzle[x, y] != null)
break;
}
puzzle[x, y] = null;
bool isUnique = true;
for (int l = 1; l < 10 && isUnique; l++)
{
CopyPuzzle(puzzle, grid);
solver.InitSeed = l;
solver.Solve(grid);
isUnique = Resolved(solution, grid);
if (k == blanks && isUnique == true && parentSolver != null)
{
// Check if the solver with a smaller level can also solve this puzzle
// If yes then we should change it...
CopyPuzzle(puzzle, grid);
parentSolver.InitSeed = l;
solver.Solve(grid);
if (Resolved(solution, grid))
{
isUnique = false;
break;
}
}
}
if (isUnique)
break;
puzzle[x, y] = solution[x, y];
// Place something back
if (k > 0 && rnd.Next(0, 10) == 0)
{
k--;
while (true)
{
x = rnd.Next(0, 9);
y = rnd.Next(0, 9);
if (puzzle[x, y] == null)
{
puzzle[x, y] = solution[x, y];
break;
}
}
}
}
}
}
}
} |
