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The most common way to obtain a Graphics object is to interact with the Paint event. Recall from the previous chapter that the Control class defines a virtual method named OnPaint(). When you want a Form to render graphical data to its surface, you may override this method and extract a Graphics object from the incoming PaintEventArgs parameter. To illustrate, create a new Windows Forms application named BasicPaintForm, and update the Form-derived class as so: public partial class MainForm : Form { public MainForm() { InitializeComponent(); CenterToScreen(); this.Text = "Basic Paint Form"; } protected override void OnPaint(PaintEventArgs e) { // If overriding OnPaint(), be sure to call base class implementation. base.OnPaint(e); // Obtain a Graphics object from the incoming // PaintEventArgs. Graphics g = e.Graphics; // Render a textual message in a given font and color. g.DrawString("Hello GDI+", new Font("Times New Roman", 20), Brushes.Green, 0, 0); } } While overriding OnPaint() is permissible, it is more common to handle the Paint event using the associated PaintEventHandler delegate (in fact, this is the default behavior taken by Visual Studio 2005 when handling events with the Properties window). This delegate can point to any method taking a System.Object as the first parameter and a PaintEventArgs as the second. Assuming you have handled the Paint event (via the Visual Studio 2005 designers or manually in code), you are once again able to extract a Graphics object from the incoming PaintEventArgs. Here is the update: public partial class MainForm : Form { public MainForm() { InitializeComponent(); CenterToScreen();

The trial-and-error process is your friend; follow your instincts, make a change, and see what happens. Tip

this.Text = "Basic Paint Form"; // Visual Studio 2005 places this // code within InitializeComponent(). this.Paint += new PaintEventHandler(MainForm_Paint); } private void MainForm_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; g.DrawString("Hello GDI+", new Font("Times New Roman", 20), Brushes.Green, 0, 0); } } Regardless of how you respond to the Paint event, be aware that whenever a window becomes dirty, the Paint event will fire. As you may be aware, 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 when your Form needs to be redrawn, the Paint event handler (or overridden OnPaint() method) is called automatically.

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During the flow of a GDI+ application, you may need to explicitly fire the Paint event, rather than waiting for the window to become naturally dirty. For example, you may be building a program that allows the user to select from a number of bitmap images using a custom dialog box. Once the dialog box is dismissed, you need to draw the newly selected image onto the Form s client area. Obviously, if you waited for the window to become naturally dirty, the user would not see the change take place until the window was resized or uncovered by another window. To force a window to repaint itself programmatically, simply call the inherited Invalidate() method: public partial class MainForm: Form { ... private void MainForm_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; // Render a bitmap here. } private void GetNewBitmap() { // Show dialog box and get new image. // Repaint the entire client area. Invalidate(); } } The Invalidate() method has been overloaded a number of times to allow you to specify a specific rectangular region to repaint, rather than repainting the entire client area (which is the default). If you wish to only update the extreme upper-left rectangle of the client area, you could write the following: // Repaint a given rectangular area of the Form. private void UpdateUpperArea() {

The _rels folder is the first place you should look to see what your Excel file is made of. The _rels folder contains a file named .rels. This file contains the top-level relationships. In your file, they should look like Figure 3-23.

Rectangle myRect = new Rectangle(0, 0, 75, 150); Invalidate(myRect); }

After these small tweaks, our layout is looking nice and crisp, except for the margin between our columns and footer (Figure 14-15).

In some rare cases, you may need to access a Graphics object outside the scope of a Paint event handler For example, assume you wish to draw a small circle at the (x, y) position where the mouse has been clicked To obtain a valid Graphics object from within the scope of a MouseDown event handler, one approach is to call the static GraphicsFromHwnd() method Based on your background in Win32 development, you may know that an HWND is a data structure that represents a given Win32 window Under the NET platform, the inherited Handle property extracts the underlying HWND, which can be used as a parameter to GraphicsFromHwnd(): private void MainForm_MouseDown(object sender, MouseEventArgs e) { // Grab a Graphics object via Hwnd Graphics g = GraphicsFromHwnd(thisHandle); // Now draw a 10*10 circle at mouse click gFillEllipse(BrushesFirebrick, eX, e.

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