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.NET Table 7.3 PaintEventArgs class
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The PaintEventArgs class defines the event data required by the Paint event. This class inherits from the System.EventArgs class, and is part of the System.Windows.Forms namespace. ClipRectangle Public Properties Graphics Gets the Rectangle representing the area of the object that needs to be painted. This property is read-only. Gets the Graphics to use when painting the object.
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IMPLEMENTING A SCALE TO FIT OPTION The Stretch to Fit option we have used so far is really a poor choice for displaying an image. Users really do not want their images distorted when displayed on the screen. This option makes a nice example to use in our book, but otherwise is not all that useful. Even so, we will keep the option available as a contrast to the more appropriate solution we are about to implement. Ideally, an image is scaled so that it fits inside the available window space. We will call this option Scale to Fit, and make it the default for our application. An important aspect of this option is the calculation to determine the proper rectangle in which to 205
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draw the image. This rectangle should be centered in the available area with the same aspect ratio of the original image. Figure 7.3 illustrates the scaling of an image from its original size to fit within the display area of the application. Note that the image is not distorted since the aspect ratio of the image is preserved from its original size. If you look closely here, you will realize that the image is centered between the base of the menu and the bottom of the window, as opposed to the top of the status bar. This is because the client area includes the status bar, even though our image does not cover it up. This is a minor problem that many users will not notice. Of course, since we have noticed, it will have to be fixed. First we need to create the code necessary to match the figure, and later we will worry about making it better.
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Figure 7.3 Scaling an image from its original size to fit the display area is similar to zooming in or out of a graphic. The image looks the same; it just gets smaller or larger.
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The operation of scaling a photograph to fit an available area could be a common operation in a photo album application. Because of this, let s create a method for this algorithm in our MyPhotoAlbum library so that it can be used by other applications, and perhaps later in the book. We will add this method to the Photograph class with the following signature:
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public Rectangle ScaleToFit(Rectangle targetArea)
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The following steps detail the implementation of this method. Once the method is available, we will look at adding our new option to the menu, and updating our handlers using this new method.
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Set the version number of the MyPhotoAlbum library to 7 .2. IMPLEMENT A SCALETOFIT METHOD IN THE PHOTOGRAPH CLASS Action 1 In the Photograph.cs file, add the
ScaleToFit method.
Result
public Rectangle ScaleToFit (Rectangle targetArea) { Rectangle result = new Rectangle(targetArea.Location, targetArea.Size); // Determine best fit: width or height if (result.Height * Image.Width > result.Width * Image.Height) { // Final width should match target, // determine and center height result.Height = result.Width * Image.Height / Image.Width; result.Y += (targetArea.Height - result.Height) / 2; } else { // Final height should match target, // determine and center width result.Width = result.Height * Image.Width / Image.Height; result.X += (targetArea.Width - result.Width) / 2; } return result; }
Define a Rectangle to hold the calculated result. Determine whether the photograph will fit best horizontally or vertically.
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