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static void Main(string[] args) { ObtainCarDelegate targetA = new ObtainCarDelegate(GetBasicCar); Car c = targetA(); ObtainSportsCarDelegate targetB = new ObtainSportsCarDelegate(GetSportsCar); SportsCar sc = targetB(); Console.ReadLine(); } } Given the laws of classic inheritance, it would be ideal to build a single delegate type that can point to methods returning either Car or SportsCar types (after all, a SportsCar is-a Car). Covariance allows for this very possibility. Simply put, covariance allows you to build a single delegate that can point to methods returning class types related by classical inheritance: class Program { // Define a single deletate that may return a Car // or SportsCar. public delegate Car ObtainVehicalDelegate(); public static Car GetBasicCar() { return new Car(); } public static SportsCar GetSportsCar() { return new SportsCar(); } static void Main(string[] args) { Console.WriteLine("***** Delegate Covariance *****\n"); ObtainVehicalDelegate targetA = new ObtainVehicalDelegate(GetBasicCar); Car c = targetA(); // Covariance allows this target assignment. ObtainVehicalDelegate targetB = new ObtainVehicalDelegate(GetSportsCar); SportsCar sc = (SportsCar)targetB(); Console.ReadLine(); } } Notice that the ObtainVehicalDelegate delegate type has been defined to point to methods returning a strongly typed Car type. Given covariance, however, we can point to methods returning derived types as well. To obtain the derived type, simply perform an explicit cast.

public MainForm() { .. // Add handlers for the following events happyBoxMouseDown += new MouseEventHandler(happyBox_MouseDown); happyBoxMouseUp += new MouseEventHandler(happyBox_MouseUp); happyBoxMouseMove += new MouseEventHandler(happyBox_MouseMove); ControlsAdd(happyBox); InitializeComponent(); } The MouseDown event handler is in charge of storing the incoming (x, y) location of the cursor within two SystemInt32 member variables (oldX and oldY) for later use, as well as setting a SystemBoolean member variable (isDragging) to true, to indicate that a drag operation is in process Add these member variables to your Form and implement the MouseDown event handler as so: private void happyBox_MouseDown(object sender, MouseEventArgs e) { isDragging = true; oldX = eX; oldY = e.

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Y; } The MouseMove event handler simply relocates the position of the PictureBox (using the Top and Left properties) by offsetting the current cursor location with the integer data captured during the MouseDown event: private void happyBox_MouseMove(object sender, MouseEventArgs e) { if (isDragging) { // Need to figure new Y value based on where the mouse // down click happened happyBoxTop = happyBoxTop + (eY - oldY); // Same process for X (use oldX as a baseline) happyBoxLeft = happyBoxLeft + (eX - oldX); } } The MouseUp event handler sets the isDragging Boolean to false, to signal the end of the drag operation As well, if the MouseUp event occurs when the PictureBox is contained within our GDI+rendered Rectangle image, you can assume the user has won the (albeit rather simplistic) game.

First, add a Rectangle member variable (named dropRect) to your Form class set to a given size: public partial class MainForm : Form { private PictureBox happyBox = new PictureBox(); private int oldX, oldY; private bool isDragging; private Rectangle dropRect = new Rectangle(100, 100, 140, 170); .. } The MouseUp event handler can now be implemented as so: private void happyBox_MouseUp(object sender, MouseEventArgs e) { isDragging = false; // Is the mouse within the area of the drop rect.

The following is a reference to all CS properties. In the Value component of each, the pipe character (|) indicates the word or. In the Supported by component, Firefox refers to Firefox 1.5, Safari refers to Safari 2.0, Opera refers to Opera 9, and Internet Explorer refers to Internet Explorer 6 (the current versions of these browsers at the time of this writing).

Type: Lists the expression type. Context: Lists the context of the watch expression. You can close the window by clicking the Close box. If the Close box is not visible, doubleclick the Title bar to make the Close box visible, and then click it.

if(dropRect.Contains(happyBox.Bounds)) MessageBox.Show("You win!", "What an amazing test of skill..."); } Finally, you need to render the rectangular area (maintained by the dropRect member variable) on the Form within a Paint event handler: private void MainForm_Paint(object sender, PaintEventArgs e) { // Draw the drop box. Graphics g = e.Graphics; g.FillRectangle(Brushes.AntiqueWhite, dropRect); // Display instructions. g.DrawString("Drag the happy guy in here...", new Font("Times New Roman", 25), Brushes.Red, dropRect); } When you run the application, you are presented with what appears in Figure 20-19.

Figure 20-19. The amazing happy-dude game If you have what it takes to win the game, you are rewarded with the kudos shown in Figure 20-20.

Figure 20-20. You have nerves of steel!

Indicates the text color. Note that the value of the color property is also applied for text decorations (such as underlines) and as an initial value for border colors (but it s overridden if a border color is explicitly specified). Value: <rgb value> | <hexadecimal value> | <color name> Initial value: Determined by user agent Inherited: Yes Applies to: All elements Supported by: Firefox, Safari, Opera, Internet Explorer

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