void NewGame(float width, float height)
{
// The constructor creates the random maze layout
mazeGrid = new MazeGrid(MAZE_HORZ_CHAMBERS, MAZE_VERT_CHAMBERS);
// Initialize borders collection
borders.Clear();
// Create Line2D objects for the border lines of the maze
float cellWidth = width / mazeGrid.Width;
float cellHeight = height / mazeGrid.Height;
int halfWallWidth = WALL_WIDTH / 2;
for (int x = 0; x < mazeGrid.Width; x++)
{
for (int y = 0; y < mazeGrid.Height; y++)
{
MazeCell mazeCell = mazeGrid.Cells[x, y];
Vector2 ll = new Vector2(x * cellWidth, (y + 1) * cellHeight);
Vector2 ul = new Vector2(x * cellWidth, y * cellHeight);
Vector2 ur = new Vector2((x + 1) * cellWidth, y * cellHeight);
Vector2 lr = new Vector2((x + 1) * cellWidth, (y + 1) * cellHeight);
Vector2 right = halfWallWidth * Vector2.UnitX;
Vector2 left = -right;
Vector2 down = halfWallWidth * Vector2.UnitY;
Vector2 up = -down;
if (mazeCell.HasLeft)
{
borders.Add(new Line2D(ll + down, ll + down + right));
borders.Add(new Line2D(ll + down + right, ul + up + right));
borders.Add(new Line2D(ul + up + right, ul + up));
}
if (mazeCell.HasTop)
{
borders.Add(new Line2D(ul + left, ul + left + down));
borders.Add(new Line2D(ul + left + down, ur + right + down));
borders.Add(new Line2D(ur + right + down, ur + right));
}
if (mazeCell.HasRight)
{
borders.Add(new Line2D(ur + up, ur + up + left));
borders.Add(new Line2D(ur + up + left, lr + down + left));
borders.Add(new Line2D(lr + down + left, lr + down));
}
if (mazeCell.HasBottom)
{
borders.Add(new Line2D(lr + right, lr + right + up));
borders.Add(new Line2D(lr + right + up, ll + left + up));
borders.Add(new Line2D(ll + left + up, ll + left));
}
}
}
// Prepare AbsoluteLayout for new children
absoluteLayout.Children.Clear();
// "Draw" the walls of the maze using BoxView
BoxView createBoxView() => new BoxView
{
Color = Color.Green
};
for (int x = 0; x < mazeGrid.Width; x++)
{
for (int y = 0; y < mazeGrid.Height; y++)
{
MazeCell mazeCell = mazeGrid.Cells[x, y];
if (mazeCell.HasLeft)
{
Rectangle rect = new Rectangle(x * cellWidth,
y * cellHeight - halfWallWidth,
halfWallWidth, cellHeight + WALL_WIDTH);
absoluteLayout.Children.Add(createBoxView(), rect);
}
if (mazeCell.HasRight)
{
Rectangle rect = new Rectangle((x + 1) * cellWidth - halfWallWidth,
y * cellHeight - halfWallWidth,
halfWallWidth, cellHeight + WALL_WIDTH);
absoluteLayout.Children.Add(createBoxView(), rect);
}
if (mazeCell.HasTop)
{
Rectangle rect = new Rectangle(x * cellWidth - halfWallWidth,
y * cellHeight,
cellWidth + WALL_WIDTH, halfWallWidth);
absoluteLayout.Children.Add(createBoxView(), rect);
}
if (mazeCell.HasBottom)
{
Rectangle rect = new Rectangle(x * cellWidth - halfWallWidth,
(y + 1) * cellHeight - halfWallWidth,
cellWidth + WALL_WIDTH, halfWallWidth);
absoluteLayout.Children.Add(createBoxView(), rect);
}
}
}
// Randomly position ball in one of the corners
bool isBallLeftCorner = random.Next(2) == 0;
bool isBallTopCorner = random.Next(2) == 0;
// Create the hole first (so Z order is under the ball)
// and position it in the opposite corner from the ball
hole = new EllipseView
{
Color = Color.Black,
WidthRequest = 2 * HOLE_RADIUS,
HeightRequest = 2 * HOLE_RADIUS
};
holePosition = new Vector2((isBallLeftCorner ? 2 * mazeGrid.Width - 1 : 1) * (width / mazeGrid.Width / 2),
(isBallTopCorner ? 2 * mazeGrid.Height - 1 : 1) * (height / mazeGrid.Height / 2));
absoluteLayout.Children.Add(hole, new Point(holePosition.X - HOLE_RADIUS,
holePosition.Y - HOLE_RADIUS));
// Create the ball and set initial position
ball = new EllipseView
{
Color = Color.Red,
WidthRequest = 2 * BALL_RADIUS,
HeightRequest = 2 * BALL_RADIUS
};
ballPosition = new Vector2((isBallLeftCorner ? 1 : 2 * mazeGrid.Width - 1) * (width / mazeGrid.Width / 2),
(isBallTopCorner ? 1 : 2 * mazeGrid.Height - 1) * (height / mazeGrid.Height / 2));
absoluteLayout.Children.Add(ball, new Point(ballPosition.X - BALL_RADIUS,
ballPosition.Y - BALL_RADIUS));
}
protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
viewport = this.GraphicsDevice.Viewport;
// Create texture for the walls of the maze
tinyTexture = new Texture2D(this.GraphicsDevice, 1, 1);
tinyTexture.SetData <Color>(new Color[] { Color.White });
// Create ball
ball = Texture2DExtensions.CreateBall(this.GraphicsDevice,
BALL_RADIUS * BALL_SCALE);
ballCenter = new Vector2(ball.Width / 2, ball.Height / 2);
ballPosition = new Vector2((viewport.Width / mazeGrid.Width) / 2,
(viewport.Height / mazeGrid.Height) / 2);
// Initialize borders collection
borders.Clear();
// Create Line2D objects for walls of the maze
int cellWidth = viewport.Width / mazeGrid.Width;
int cellHeight = viewport.Height / mazeGrid.Height;
int halfWallWidth = WALL_WIDTH / 2;
for (int x = 0; x < mazeGrid.Width; x++)
{
for (int y = 0; y < mazeGrid.Height; y++)
{
MazeCell mazeCell = mazeGrid.Cells[x, y];
Vector2 ll = new Vector2(x * cellWidth, (y + 1) * cellHeight);
Vector2 ul = new Vector2(x * cellWidth, y * cellHeight);
Vector2 ur = new Vector2((x + 1) * cellWidth, y * cellHeight);
Vector2 lr = new Vector2((x + 1) * cellWidth, (y + 1) * cellHeight);
Vector2 right = halfWallWidth * Vector2.UnitX;
Vector2 left = -right;
Vector2 down = halfWallWidth * Vector2.UnitY;
Vector2 up = -down;
if (mazeCell.HasLeft)
{
borders.Add(new Line2D(ll + down, ll + down + right));
borders.Add(new Line2D(ll + down + right, ul + up + right));
borders.Add(new Line2D(ul + up + right, ul + up));
}
if (mazeCell.HasTop)
{
borders.Add(new Line2D(ul + left, ul + left + down));
borders.Add(new Line2D(ul + left + down, ur + right + down));
borders.Add(new Line2D(ur + right + down, ur + right));
}
if (mazeCell.HasRight)
{
borders.Add(new Line2D(ur + up, ur + up + left));
borders.Add(new Line2D(ur + up + left, lr + down + left));
borders.Add(new Line2D(lr + down + left, lr + down));
}
if (mazeCell.HasBottom)
{
borders.Add(new Line2D(lr + right, lr + right + up));
borders.Add(new Line2D(lr + right + up, ll + left + up));
borders.Add(new Line2D(ll + left + up, ll + left));
}
}
}
}