/// <summary>
/// Gets a neighboring game button based on
/// a direction and an offset value
/// </summary>
/// <param name="gb">The origina button</param>
/// <param name="dir">Which direction to look</param>
/// <param name="offset">How many spots away is the button to get?</param>
/// <returns>A game button, or null if invalid indices are found</returns>
private GameButton GetNeighbor(GameButton gb, Direction dir, int offset)
{
// Calculate the indices of the neighbor button
int x = gb.XIndex;
int y = gb.YIndex;
// Check the four possible directions
switch (dir)
{
case Direction.Up: y -= offset; break;
case Direction.Down: y += offset; break;
case Direction.Left: x -= offset; break;
case Direction.Right: x += offset; break;
}
// Are my new indices actually valid?
if (x < 0 || y < 0 ||
x >= gameSize.Width ||
y >= gameSize.Height)
{
// We're off the grid! Problem
return(null);
}
// Return the piece from the grid
// at that position
return(buttonGrid[x, y]);
}
/// <summary>
/// This is called whenever a button in the grid
/// is clicked - it should take care of the "selection"
/// logic and eventually more
/// </summary>
private void ButtonClicked(object sender, EventArgs e)
{
// Ensure a button was actually clicked
GameButton button = sender as GameButton;
if (button == null)
{
return; // Nothing to do, get out!
}
// Is nothing selected?
if (selected == null)
{
selected = button;
}
else if (button == selected)
{
// The clicked button was also
// the currently selected button
selected.Deselect();
selected = null;
}
else // There WAS a selected button!
{
// Update the visuals
selected.Deselect();
// Determine if the two buttons
// are "neighbors"
int xDiff = Math.Abs(selected.XIndex - button.XIndex);
int yDiff = Math.Abs(selected.YIndex - button.YIndex);
// Are the two buttons next to each other?
if ((xDiff == 1 && yDiff == 0) ||
(xDiff == 0 && yDiff == 1))
{
selected.MoveTo(button.Location);
button.MoveTo(selected.Location);
// Make sure to update the indices
SwapIndices(button, selected);
}
// Deselect everything!
selected.Deselect();
button.Deselect();
selected = null;
}
}
/// <summary>
/// Determines if the specified button is part
/// of a valid (winning) group
/// </summary>
/// <param name="gb">The button to check</param>
/// <returns>True if in a valid group, false otherwise</returns>
private bool IsPartOfGroup(GameButton gb)
{
// Check the length in all directions
upLength = GetGroupLength(gb, Direction.Up);
downLength = GetGroupLength(gb, Direction.Down);
leftLength = GetGroupLength(gb, Direction.Left);
rightLength = GetGroupLength(gb, Direction.Right);
// Calculate each axis
int vertical = upLength + downLength - 1;
int horiz = leftLength + rightLength - 1;
// Did we find a valid group?
return(vertical >= MinimumToWin ||
horiz >= MinimumToWin);
}
/// <summary>
/// Swaps the indices of two buttons, in both
/// the grid (the 2d array) and inside the
/// buttons themselves
/// </summary>
/// <param name="b1">The first button</param>
/// <param name="b2">The other button</param>
private void SwapIndices(GameButton b1, GameButton b2)
{
// Update the grid/array first
buttonGrid[b1.XIndex, b1.YIndex] = b2;
buttonGrid[b2.XIndex, b2.YIndex] = b1;
// Swap the internal indices of the buttons
int b1X = b1.XIndex;
int b1Y = b1.YIndex;
// Overwrite b1
b1.XIndex = b2.XIndex;
b1.YIndex = b2.YIndex;
// Overwrite b2
b2.XIndex = b1X;
b2.YIndex = b1Y;
}
/// <summary>
/// Creates a manager for handling all of
/// the game logic
/// </summary>
/// <param name="width">Number of buttons on the x axis</param>
/// <param name="height">Number of buttons on the y axis</param>
/// <param name="gameForm">The game form itself</param>
public GameManager(int width, int height, GameForm gameForm)
{
// Save the parameters
this.gameSize = new Size(width, height);
this.gameForm = gameForm;
// Set up fields
random = new Random();
buttonGrid = new GameButton[width, height];
selected = null;
gameForm.ClientSize = new Size(
width * ButtonSize,
height * ButtonSize);
// Create the buttons
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
// Create a single button
GameButton gb = new GameButton(
colors[random.Next(colors.Length)], // Get a random color out of the color array
x,
y);
// Add the button to the game form itself
this.gameForm.Controls.Add(gb);
// Add to the array (grid) itself too
buttonGrid[x, y] = gb;
// Hook up the button's click event so
// that the manager knows about it too!
gb.Click += ButtonClicked;
// Make sure the color doesn't trigger
// a win state
while (IsPartOfGroup(gb))
{
gb.BackColor = colors[random.Next(colors.Length)];
}
}
}
}
/// <summary>
/// Gets the length of a group of similar colors
/// in a particular direction
/// starting at the specified game button
/// </summary>
/// <param name="gb">Which button to check</param>
/// <param name="dir">Which direction to look</param>
/// <returns>At least 1, potentially more</returns>
private int GetGroupLength(GameButton gb, Direction dir)
{
// Starting values
int groupCount = 0;
GameButton currentButton = null;
do
{
// Alter the current group count
groupCount++;
// Get the neighbor in the specified direction
currentButton =
GetNeighbor(gb, dir, groupCount);
} while(currentButton != null && currentButton.BackColor == gb.BackColor);
// Return the final group count
return(groupCount);
}
public void UpdateGroups(GameButton gb)
{
bool isAGroup;
int x = gb.XIndex;
int y = gb.YIndex;
isAGroup = IsPartOfGroup(gb);
if (isAGroup == true)
{
gb.BackColor = Color.Black;
gb.Enabled = false;
for (int i = 0; i < upLength; i++)
{
buttonGrid[x, (y - i)].BackColor = Color.Black;
buttonGrid[x, (y - i)].Enabled = false;
}
for (int i = 0; i < downLength; i++)
{
buttonGrid[x, (y + i)].BackColor = Color.Black;
buttonGrid[x, (y + i)].Enabled = false;
}
for (int i = 0; i < leftLength; i++)
{
buttonGrid[(x - i), y].BackColor = Color.Black;
buttonGrid[(x - i), y].Enabled = false;
}
for (int i = 0; i < rightLength; i++)
{
buttonGrid[(x + i), y].BackColor = Color.Black;
buttonGrid[(x + i), y].Enabled = false;
}
score = score + (upLength + downLength + leftLength + rightLength - 2);
}
}
