/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
if (startup && KeystateHelper.IsKeyReleased(Keys.Enter))
{
startup = false;
gameBoard = new GameBoard();
}
if (!startup && KeystateHelper.IsKeyReleased(Keys.Escape))
{
paused = !paused;
}
KeystateHelper.Update();
if (!paused)
{
gameBoard?.Update((float)gameTime.ElapsedGameTime.TotalSeconds);
}
base.Update(gameTime);
}
public void Update(float deltaTime)
{
//This can happen every frame
//Check for user input left or right
//Determine if move is legal (make sure every block can move)
//If move is legal, perform it
if (KeystateHelper.IsKeyReleased(Keys.LeftShift) || KeystateHelper.IsKeyReleased(Keys.RightShift))
{
Hold();
}
bool validMove = true;
if (KeystateHelper.IsKeyReleased(Keys.Left))
{
//Move Left
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
Block testBlock = GetBlock(blockPos.X - 1, blockPos.Y);
if ((blockPos.X - 1 < 0) || (testBlock != null && !testBlock.active))
{
validMove = false;
}
}
if (validMove)
{
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
blocks[blockPos.X, blockPos.Y] = null;
}
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
b.SetPosition(new Point(blockPos.X - 1, blockPos.Y));
blocks[blockPos.X - 1, blockPos.Y] = b;
}
activeOrigin.X -= 1;
}
}
else if (KeystateHelper.IsKeyReleased(Keys.Right))
{
//Move Right
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
Block testBlock = GetBlock(blockPos.X + 1, blockPos.Y);
if ((blockPos.X + 1 >= TClone.WIDTH) || (testBlock != null && !testBlock.active))
{
validMove = false;
}
}
if (validMove)
{
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
blocks[blockPos.X, blockPos.Y] = null;
}
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
b.SetPosition(new Point(blockPos.X + 1, blockPos.Y));
blocks[blockPos.X + 1, blockPos.Y] = b;
}
activeOrigin.X += 1;
}
}
validMove = true;
if (KeystateHelper.IsKeyReleased(Keys.LeftControl) || KeystateHelper.IsKeyReleased(Keys.RightControl))
{
//Rotate clockwise
//Determine centerpoint
//Determine relative coordinates for each block
//new relative coordinates = (x,y) -> (y,-x)
//Check if rotation is possible
bool validRotation = true;
Point[] newPositions = new Point[activeBlocks.Count];
for (int i = 0; i < newPositions.Length; i++)
{
Point pos = activeBlocks[i].GetPosition() - activeOrigin;
Point newPos = new Point(-pos.Y, pos.X) + activeOrigin;
newPositions[i] = newPos;
Block testBlock = GetBlock(newPos.X, newPos.Y);
if ((newPos.X < 0 || newPos.X >= TClone.WIDTH || newPos.Y < 0 || newPos.Y >= TClone.HEIGHT) ||
testBlock != null && !testBlock.active)
{
validRotation = false;
}
}
if (validRotation)
{
//Remove the blocks from their current positon
foreach (Block b in activeBlocks)
{
Point pos = b.GetPosition();
blocks[pos.X, pos.Y] = null;
}
for (int i = 0; i < newPositions.Length; i++)
{
Block b = activeBlocks[i];
blocks[newPositions[i].X, newPositions[i].Y] = b;
b.SetPosition(newPositions[i]);
}
}
}
//Accelerate the timer to drop the block faster
if (KeystateHelper.state.IsKeyDown(Keys.Down))
{
timer += deltaTime * 5;
}
timer += deltaTime;
if (timer < timePerDrop)
{
return;
}
timer = timer - timePerDrop;
//This happens on a timer
//Determine if the active blocks can fall again
//If move is legal, drop the blocks
//Else spawn a new block
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
Block testBlock = GetBlock(blockPos.X, blockPos.Y + 1);
if ((blockPos.Y + 1 >= TClone.HEIGHT) || (testBlock != null && !testBlock.active))
{
validMove = false;
}
}
if (validMove)
{
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
blocks[blockPos.X, blockPos.Y] = null;
}
foreach (Block b in activeBlocks)
{
Point blockPos = b.GetPosition();
b.SetPosition(new Point(blockPos.X, blockPos.Y + 1));
blocks[blockPos.X, blockPos.Y + 1] = b;
}
activeOrigin.Y += 1;
}
else
{
//Check for and clear complete lines
int multiplier = 0;
for (int y = 0; y < TClone.HEIGHT; y++)
{
bool completeLine = true;
for (int x = 0; x < TClone.WIDTH; x++)
{
if (blocks[x, y] == null)
{
completeLine = false;
}
}
if (completeLine)
{
if (multiplier == 0)
{
multiplier = 1;
}
else
{
multiplier *= 2;
}
for (int x = 0; x < TClone.WIDTH; x++)
{
blocks[x, y] = null;
}
//Drop above blocks by one
for (int j = y - 1; j >= 0; j--)
{
for (int i = 0; i < TClone.WIDTH; i++)
{
Block b = blocks[i, j];
blocks[i, j] = null;
if (b == null)
{
continue;
}
b.SetPosition(new Point(i, j + 1));
blocks[i, j + 1] = b;
}
}
}
}
score += multiplier * 100;
PlacePrefab(nextPrefab);
nextPrefab = Block.prefabs[rand.Next(Block.prefabs.Count)];
}
}