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The most common way to obtain a Graphics object is to use the Visual Studio 2010 Properties window to handle the Paint event on the window you want to render upon. This event is defined in terms of the PaintEventHandler delegate, which can point to any method taking a System.Object as the first parameter and a PaintEventArgs as the second. The PaintEventArgs parameter contains the Graphics object you need to render onto the Form s surface. For example, create a new Windows Application project named PaintEventApp. Next, use Solution Explorer to rename your initial Form.cs file to MainWindow.cs, and then handle the Paint event using the Properties window. This creates the following stub code: public partial class MainWindow : Form { public MainWindow() { InitializeComponent(); } private void MainWindow_Paint(object sender, PaintEventArgs e) { // Add your painting code here! } } Now that you have handled the Paint event, you might wonder when it will fire. The Paint event fires whenever a window becomes dirty; a window is considered dirty whenever it is resized, uncovered by another window (partially or completely), or minimized and then restored. In all these cases, the .NET platform ensures that the Paint event handler is called automatically whenever your Form needs to be redrawn. Consider the following implementation of MainWindow_Paint(): private void MainWindow_Paint(object sender, PaintEventArgs e) { // Get the graphics object for this Form. Graphics g = e.Graphics; // Draw a circle. g.FillEllipse(Brushes.Blue, 10, 20, 150, 80);

In the examples you ve looked at so far, the second event parameter has always been used to pass a System.EventArgs object. This object doesn t contain any additional information it s just a glorified placeholder. One control that does send extra information is the ImageButton control. It sends a special ImageClickEventArgs object (from the System.Web.UI namespace) that provides X and Y properties representing the location where the image was clicked. Using this additional information, you can create a server-side image map. For example, here s the code that simply displays the location where the image was clicked and checks whether it was over a predetermined region of the picture you can find this code and many other examples in the download for this book: Protected Sub ImageButton1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) lblResult.Text = "You clicked at (" & e.X.ToString() & ", " _ & e.Y.ToString() & "). " If (e.Y > 20) AndAlso (e.Y < 100) AndAlso (e.X > 20) AndAlso (e.X < 275) Then lblResult.Text &= "You clicked on the button surface." Else lblResult.Text &= "You clicked the button border." End If End Sub The sample web page shown in Figure 4-9 puts this feature to work with a simple graphical button. Depending on whether the user clicks the button border or the button surface, the web page displays a different message.

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// Draw a string in a custom font. g.DrawString("Hello GDI+", new Font("Times New Roman", 30), Brushes.Red, 200, 200); // Draw a line with a custom pen. using (Pen p = new Pen(Color.YellowGreen, 10)) { g.DrawLine(p, 80, 4, 200, 200); } } Once you obtain the Graphics object from the incoming PaintEventArgs parameter, you call FillEllipse(). Notice that this method (as well as any Fill-prefixed method) requires a Brush-derived type as the first parameter. While you could create any number of interesting brush objects from the System.Drawing.Drawing2D namespace (e.g., HatchBrush and LinearGradientBrush), the Brushes utility class provides handy access to a variety of solid-colored brush types. Next, you make a call to DrawString(), which requires a string to render as its first parameter. Given this, GDI+ provides the Font type, which represents not only the name of the font to use when rendering the textual data, but also related characteristics, such as the point size (30, in this case). Also notice that DrawString() requires a Brush type; as far as GDI+ is concerned, Hello GDI+ is nothing more than a collection of geometric patterns to fill on the screen. Finally, DrawLine() is called to render a line using a custom Pen type, 10 pixels wide. Figure A-21 shows the output of this rendering logic.

Note In the preceding code, you explicitly dispose of the Pen object. As a rule, when you directly create a GDI+ type that implements IDisposable, you call the Dispose() method as soon as you are done with the object. Doing this lets you release the underlying resources as soon as possible. If you do not do this, the resources will eventually be freed by the garbage collector in a nondeterministic manner.

Another more powerful approach to handling image clicks is to create a server-side image map using the ImageMap control. The ImageMap control is demonstrated in 28, which deals with dynamic graphics.

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