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Listing 3 3. XAML that Constructs the Port Checker User Interface <Window x:Class="ProWpfAndSilverlightMVVM.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Port Checker" Height="100" Width="200"> <StackPanel Orientation="Vertical"> <StackPanel Orientation="Horizontal"> <Label Content="Port Number:" /> <TextBox Name="portNumber" Width="95" /> </StackPanel> <Button Content="Check Port" Click="CheckPortClick" /> </StackPanel> </Window> Listing 3 4. The Code Behind that Responds to the Check Port Button using System.Net.Sockets; public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void CheckPortClick(object sender, RoutedEventArgs e) { int portNumberInt = -1; if (int.TryParse(portNumber.Text, out portNumberInt)) { Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); try { sock.Connect(System.Net.Dns.GetHostName(), portNumberInt); if (sock.Connected) { MessageBox.Show("This port is closed :("); } } catch (SocketException ex) { if (ex.SocketErrorCode == SocketError.ConnectionRefused) { MessageBox.Show("This port is open =D"); } } finally { sock.Close(); } }

Storyboard.SetTargetProperty(fallAnimation, new PropertyPath("(Canvas.Top)")); storyboard.Children.Add(fallAnimation); // Create the animation for the bomb "wiggle." DoubleAnimation wiggleAnimation = new DoubleAnimation(); wiggleAnimation.To = 30; wiggleAnimation.Duration = TimeSpan.FromSeconds(0.2); wiggleAnimation.RepeatBehavior = RepeatBehavior.Forever; wiggleAnimation.AutoReverse = true; Storyboard.SetTarget(wiggleAnimation, ((TransformGroup)bomb.RenderTransform).Children[0]); Storyboard.SetTargetProperty(wiggleAnimation, new PropertyPath("Angle")); storyboard.Children.Add(wiggleAnimation); ... Both of these animations could use animation easing for more realistic behavior, but this example keeps the code simple by using basic linear animations. The newly created storyboard is stored in a dictionary collection so it can be retrieved easily in other event handlers. The collection is stored as a field in the main window class: // Make it possible to look up a storyboard based on a bomb. private Dictionary<Storyboard, Bomb> bombs = new Dictionary<Storyboard, Bomb>(); Here s the code that adds the storyboard to the tracking collection: ... storyboards.Add(bomb, storyboard); ... Next, you attach an event handler that reacts when the storyboard finishes the fallAnimation, which occurs when the bomb hits the ground. Finally, the storyboard is started, and the animations are put in motion: ... storyboard.Duration = fallAnimation.Duration; storyboard.Completed += storyboard_Completed; storyboard.Begin(); ... The bomb-dropping code needs one last detail. As the game progresses, it becomes more difficult. The timer begins to fire more frequently, the bombs begin to appear more closely together, and the fall time is reduced. To implement these changes, the timer code makes adjustments whenever a set interval of time has passed. By default, BombDropper makes an adjustment every 15 seconds. Here are the fields that control the adjustments: // Perform an adjustment every 15 seconds. private double secondsBetweenAdjustments = 15; private DateTime lastAdjustmentTime = DateTime.MinValue; // After every adjustment, shave 0.1 seconds off both. private double secondsBetweenBombsReduction = 0.1; private double secondsToFallReduction = 0.1;

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And here s the code at the end of the DispatcherTimer.Tick event handler, which checks whether an adjustment is needed and makes the appropriate changes: ... // Perform an "adjustment" when needed. if ((DateTime.Now.Subtract(lastAdjustmentTime).TotalSeconds > secondsBetweenAdjustments)) { lastAdjustmentTime = DateTime.Now; secondsBetweenBombs -= secondsBetweenBombsReduction; secondsToFall -= secondsToFallReduction; // (Technically, you should check for 0 or negative values. // However, in practice these won't occur because the game will // always end first.) // Set the timer to drop the next bomb at the appropriate time. bombTimer.Interval = TimeSpan.FromSeconds(secondsBetweenBombs); // Update the status message. lblRate.Text = String.Format("A bomb is released every {0} seconds.", secondsBetweenBombs); lblSpeed.Text = String.Format("Each bomb takes {0} seconds to fall.", secondsToFall); } } With this code in place, there s enough functionality to drop bombs at an ever-increasing rate. However, the game still lacks the code that responds to dropped and saved bombs.

The user saves a bomb by clicking it before it reaches the bottom of the Canvas. Because each bomb is a separate instance of the Bomb user control, intercepting mouse clicks is easy all you need to do is handle the MouseLeftButtonDown event, which fires when any part of the bomb is clicked (but doesn t fire if you click somewhere in the background, such as around the edges of the bomb circle). When a bomb is clicked, the first step is to get the appropriate bomb object and set its IsFalling property to indicate that it s no longer falling. (The IsFalling property is used by the event handler that deals with completed animations.) private void bomb_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { // Get the bomb. Bomb bomb = (Bomb)sender; bomb.IsFalling = false; // Record the bomb's current (animated) position. double currentTop = Canvas.GetTop(bomb); ...

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