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If the file is an invalid bitmap, or cannot be loaded for some reason, this presents a real problem. On the one hand, this is an error, so perhaps we should return null or allow the exception to be thrown. On the other hand, the caller is expecting to display a Bitmap, and checking for null or an exception every time seems a bit cumbersome, not to mention the issue of what the caller should then display in lieu of a Bitmap object. As an alternative approach, we will instead create a special bitmap to return whenever the file cannot be loaded. This provides a Bitmap that the caller can display in any situation, but still indicates that something is wrong. We will create a private static member of our Photograph class to hold this special image, and provide a new property to indicate if a valid image for the current Photograph exists. Let s see how this looks.

Set the version number of the MyPhotoAlbum library to 5.4. HANDLE THE BITMAP EXCEPTION Action 1 In the Photograph.cs file, create a private static member to hold a Bitmap object. Add a public property to retrieve this bitmap.

In short, publishers will go on exploiting an intellectual property for as long as they can But the game industry thrives on novelty In spite of all the sequels, you probably won t get stuck developing the exact same thing forever, simply because the players won t buy the exact same thing forever

private static Bitmap _invalidImageBitmap = null;

public static Bitmap InvalidPhotoImage { get { if (_invalidImageBitmap == null) { // Create the "bad photo" bitmap Bitmap bm = new Bitmap(100, 100); Graphics g = Graphics.FromImage(bm); g.Clear(Color.WhiteSmoke); // Draw a red X Pen p = new Pen(Color.Red, 5); g.DrawLine(p, 0, 0, 100, 100); g.DrawLine(p, 100, 0, 0, 100); _invalidImageBitmap = bm; } return _invalidImageBitmap; } }

public Bitmap Image { get { if (_bitmap == null) { try { _bitmap = new Bitmap(_fileName); } catch { _bitmap = InvalidPhotoImage; } } return _bitmap; } } public bool IsImageValid { get { return (_bitmap != InvalidPhotoImage); } }

The commercial game industry may have become more conservative as it has grown, but it s not the only option available for people interested in game development There are other ways of working on games that may give you more freedom and flexibility

more realistic construction document information is presented to build a 3D model Besides the emphasis on visualizing the project from the documents, it introduces parametric objects and custom library parts The trim under the roof gables and the complex tower roof are the main modeling challenges in this exercise Figure 45 Drawings for Exercise 3

There is quite a bit of new code here (at least, by our standards in this chapter), so let s take a look at some of the more important pieces. First, look at the InvalidPhotoImage property. 152

public static Bitmap InvalidImageBitmap { get { if (_invalidImageBitmap == null) { // Create the "bad photo" bitmap Bitmap bm = new Bitmap(100, 100); Graphics g = Graphics.FromImage(bm); g.Clear(Color.WhiteSmoke); Pen p = new Pen(Color.Red, 5); g.DrawLine(p, 0, 0, 100, 100); g.DrawLine(p, 100, 0, 0, 100); _invalidImageBitmap = bm; } return _invalidImageBitmap; } }

The get implementation shown here creates and initializes the _invalidImageBitmap object the first time the property is invoked. First, a new Bitmap of size 100 100 pixels is constructed. Next, a Graphics object is generated to treat the Bitmap as a drawing surface using the static Graphics.FromImage method. Finally, a new red Pen is constructed with a width of five pixels and two lines are drawn corner to corner on the bitmap image to create a big red X. The Pen class is part of the System.Drawing namespace discussed in chapter 4. We could have used the Pen object returned by the Red property of the Pens class. This pen has a width of one pixel, so we opted to create our own pen instead. Since the _invalidImageBitmap member variable is static, this code is executed the first time the property is called, and the image is then re-used as needed for all PhotoAlbum objects in the application. In the Photograph.Image property, an exception raised while creating the bitmap is caught and the _bitmap field is set to our invalid image.