/// <summary>
/// Generates a new maze.
/// </summary>
/// <param name="goal">The intended goal of the maze.</param>
/// <returns>The intended start of the maze.</returns>
public CoordI Generate(CoordI goal)
{
_walls = new bool[Size.X * Size.Y * 2];
_flood = new int[Size.X, Size.Y];
r_generate(goal);
return FurthestFromGoal();
}
/// <summary>
/// Finds a point in the maze that is as far or further than any other point from the goal.
/// </summary>
/// <returns>The furthest point in the maze from the goal.</returns>
public CoordI FurthestFromGoal()
{
var largest = 0;
var coord = new CoordI(0, 0);
for (var x = 0; x < Size.X; ++x)
{
for (var y = 0; y < Size.Y; ++y)
{
if (largest >= _flood[x, y]) continue;
largest = _flood[x, y];
coord.X = x;
coord.Y = y;
}
}
return coord;
}
public void Generate()
{
Goal = new CoordI(_rand.Next(0, 2) * (_walls.Size.X - 1), _rand.Next(0, 2) * (_walls.Size.Y - 1));
Start = _walls.Generate(Goal);
}
/// <summary>
/// Obtains the one dimensional index from a CoordI for a cell and direction for a wall.
/// </summary>
/// <param name="c">The coordinates of the cell.</param>
/// <param name="dir">The direction of the wall.</param>
/// <returns>The corresponding index of the walls array.</returns>
public int GetWall(CoordI c, int dir)
{
if (dir < 3)
{
return 2 * (c.X + c.Y * Size.X) + dir; // west, north, east
}
return 2 * (c.X + (c.Y + 1) * Size.X) + 1; // south
}
public int GetPathValue(CoordI c)
{
return _flood[c.X, c.Y];
}
/// <summary>
/// Recursive maze generation based on the "Growing tree" algorithm.
/// Should be invoked with the goal coordinates of the maze, and no value for f.
/// </summary>
/// <param name="c">Coordinates generate from.</param>
/// <param name="f">Flood fill value for this cell.</param>
private void r_generate(CoordI c, int f = 1)
{
if (_flood.Length == 0) return;
if (_flood[c.X, c.Y] == 0)
{
_flood[c.X, c.Y] = f;
_walls[GetWall(c, 0)] = true;
_walls[GetWall(c, 1)] = true;
if (c.X < Size.X - 1) _walls[GetWall(c, 2)] = true;
if (c.Y < Size.Y - 1) _walls[GetWall(c, 3)] = true;
var items = new Stack<int>(new[] { 0, 1, 2, 3 }.OrderBy(n => _rand.Next()).ToArray());
while (items.Count > 0)
{
var active = items.Pop();
var newC = c + Order[active];
if (!InBounds(newC) || _flood[newC.X, newC.Y] != 0) continue;
r_generate(newC, f + 1);
_walls[GetWall(c, active)] = false;
}
}
}
public void Reset()
{
Size = new CoordI(_engineSettings.MazeWidth, _engineSettings.MazeHeight);
_walls = null;
_flood = null;
}
public void Move(int x, int y)
{
Velocity.Origin.X = x;
Velocity.Origin.Y = y;
GridPos = new CoordI(Velocity.Origin);
for (int i = 0; i < _numEyes; ++i)
_eyes[i].Move(Velocity.Origin);
}
public bool InBounds(CoordI c)
{
return c.X >= 0 && c.X < Size.X && c.Y >= 0 && c.Y < Size.Y;
}
public bool InBounds(CoordI c, int dir)
{
return InBounds(c) && InBounds(dir) &&
!(dir == 2 && c.X == Size.X - 1) &&
!(dir == 3 && c.Y == Size.Y - 1);
}
public CoordD(CoordI other)
{
X = other.X;
Y = other.Y;
}
public void Copy(CoordI other)
{
X = other.X;
Y = other.Y;
}
public void Move(CoordI pos)
{
Velocity.Origin.X = pos.X;
Velocity.Origin.Y = pos.Y;
GridPos = new CoordI(Velocity.Origin);
for (int i = 0; i < _numEyes; ++i)
_eyes[i].Move(Velocity.Origin);
}
/// <summary>
/// Raycasts a given <c>Ray</c> in this maze.
/// </summary>
/// <param name="ray">The <c>Ray</c> to cast.</param>
/// <param name="radius">The radius of the thing casting the ray.</param>
public void Raycast(ref Ray ray, double radius)
{
if (Math.Abs(ray.Magnitude) < Double.Epsilon)
{
ray.Velocity = 0;
return;
}
var gridCoords = new CoordI(ray.Origin);
double len = 0;
double ax;
double ay;
var walled = false;
var south = ray.GoingSouth();
var east = ray.GoingEast();
if ((south && !east) || (!south && east))
{
ax = 1.0 / Math.Cos(Consts.QuarterTurn - ray.Angle % Consts.QuarterTurn);
ay = 1.0 / Math.Cos(ray.Angle % Consts.QuarterTurn);
}
else
{
ax = 1.0 / Math.Cos(ray.Angle % Consts.QuarterTurn);
ay = 1.0 / Math.Cos(Consts.QuarterTurn - ray.Angle % Consts.QuarterTurn);
}
var testCoord = ray.Origin - gridCoords;
var testSpace = new CoordD(1,1) - testCoord;
if (_walls.test_wall(gridCoords, 2) && testSpace.X < radius)
ray.Origin.X -= radius - testSpace.X;
else if (_walls.test_wall(gridCoords, 3) && testSpace.Y < radius)
ray.Origin.Y -= radius - testSpace.Y;
else if (_walls.test_wall(gridCoords, 0) && testCoord.X < radius)
ray.Origin.X += radius - testCoord.X;
else if (_walls.test_wall(gridCoords, 1) && testCoord.Y < radius)
ray.Origin.Y += radius - testCoord.Y;
while (len < ray.Magnitude && !walled)
{
var gridSpace = ray.Origin.ByAngle(ray.Angle, len) - gridCoords;
var cellSpace = new CoordD(1,1) - gridSpace;
gridSpace.Abs();
cellSpace.Abs();
var hx = (east ? cellSpace.X : gridSpace.X) * ax;
var hy = (south ? cellSpace.Y : gridSpace.Y) * ay;
if (hx < hy)
len += (east ? Math.Max(0, cellSpace.X - radius) : Math.Max(0, gridSpace.X - radius)) * ax;
else
len += (south ? Math.Max(0, cellSpace.Y - radius) : Math.Max(0, gridSpace.Y - radius)) * ay;
var dir = hx < hy ? 0 : 1;
if ((hx < hy && east) || (hx >= hy && south)) dir += 2;
walled = !_walls.InBounds(gridCoords, dir) || _walls.test_wall(gridCoords, dir);
if (walled) continue;
switch (dir)
{
case 0:
gridCoords.X -= 1;
break;
case 1:
gridCoords.Y -= 1;
break;
case 2:
gridCoords.X += 1;
break;
case 3:
gridCoords.Y += 1;
break;
}
}
ray.Velocity = Math.Min(len, ray.Magnitude) / ray.Magnitude;
}
/// <summary>
/// Tests if a cell and wall are out of bounds, or if it is set.
/// </summary>
/// <param name="c">The coordinates of the cell.</param>
/// <param name="dir">The direction of the wall to test.</param>
/// <returns>True if the wall is out of bounds, or if the wall is set.</returns>
public bool test_wall(CoordI c, int dir)
{
return !InBounds(c, dir) || _walls[GetWall(c, dir)];
}
private int ScoreBot(CoordI gridPos, double energy)
{
var result = 0;
var learnDistance = _engineSettings.LearnDistance;
if (learnDistance && _walls.InBounds(gridPos))
result += _walls.GetPathValue(gridPos);
else if (learnDistance)
result += 1000;
result -= (int)energy;
return result;
}
/// <summary>
/// Initialise in a given position.
/// </summary>
/// <param name="pos">The position to Move to.</param>
public void Init(CoordD pos)
{
_maxEnergy = _engineSettings.MazeTime;
_numEyes = _engineSettings.BotEyes;
_radius = _engineSettings.BotRadius;
Alive = true;
Goal = false;
Energy = _maxEnergy;
GridPos = new CoordI(pos);
Move(pos);
turn_to(0.0);
}
