protected override void Draw (GameTime gameTime)
{
graphics.GraphicsDevice.Clear (Color.White);
//Texture for drawing primitive rectangles
Color[] colorData = new Color[width * height];
Texture2D rectangle = new Texture2D (graphics.GraphicsDevice, width, height);
for (int i = 0; i < width * height; i++)
colorData [i] = Color.White;
rectangle.SetData<Color> (colorData);
//Draw the maze
maze.Draw (spriteBatch, rectangle, width, height, Color.DarkSlateGray);
spriteBatch.Begin ();
//If there is both a starting position and a goal position, generate a path
if (startPos.HasValue && goalPos.HasValue) {
algorithm = new PathAlgorithm (mapWidth, mapHeight);
List<Vector2> path = algorithm.GetPath ((Vector2)startPos, (Vector2)goalPos);
//Draw the best path given the coordinates.
foreach (Vector2 vector in path) {
spriteBatch.Draw (rectangle, new Vector2 (vector.X * width, vector.Y * height), Color.Yellow);
}
}
//This is rendered last to ensure the starting node and end node overwrites the best path.
//If the mouse cursor is in bounds and not over a wall and a starting point has been given
if (startPos.HasValue)
spriteBatch.Draw (rectangle, new Vector2 (startPos.Value.X * width, startPos.Value.Y * height), Color.Green);
//If the mouse cursor is in bounds and not over a wall and an end point has been given
if (goalPos.HasValue)
spriteBatch.Draw (rectangle, new Vector2 (goalPos.Value.X * width, goalPos.Value.Y * height), Color.Red);
spriteBatch.End ();
base.Draw (gameTime);
}
