Figure 76 Reading the properties of an image in .NET

Generator Code128 in .NET Figure 76 Reading the properties of an image
Figure 76 Reading the properties of an image
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73 Manipulating Images
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In the previous section we covered how to read, view, and save images In this section we will manipulate images and cover the following topics:
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Creating image thumbnails Rotating Flipping and zooming in and out (magnifying and demagnifying) images
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731 Creating a Thumbnail of an Image
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A thumbnail is a small representation of an image The Image class provides a method called GetThumbnailImage, which is used to create a thumbnail This method's first two parameters are the width and height of the thumbnail image The third parameter is ImageGetThumbnailImageAbort, which is not used in GDI+ version 10 but must be passed in for compatibility The fourth parameter must be of type IntPtrZero This parameter is not used in the current version If both the width and height parameters are 0, GDI+ will return the embedded thumbnail if there is one in the image; otherwise a system-defined size is used For most JPEG images from digital cameras, it is better to pass both zeros in for both parameters to get the embedded thumbnail To test the thumbnail code, we add a menu named Options to the MainMenu control, as well as aCreate Thumbnail menu item We add Create Thumbnail as a submenu item or on a button click event handler, as Listing 76 shows We create an ImageGetThumbnailImageAbort parameter, and then we call GetThumbnailImage with one-fourth the width and height of the original size, followed by the DrawImage method
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Listing 76 Creating and drawing a thumbnail image
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private void ThumbnailMenu_Click(object sender, SystemEventArgs e) { if(curImage != null) { // Callback ImageGetThumbnailImageAbort tnCallBack = new ImageGetThumbnailImageAbort(tnCallbackMethod); // Get the thumbnail image Image thumbNailImage = curImageGetThumbnailImage (100, 100, tnCallBack, IntPtrZero); // Create a Graphics object Graphics tmpg = thisCreateGraphics(); tmpgClear(thisBackColor); // Draw thumbnail image tmpgDrawImage(thumbNailImage, 40, 20);
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// Dispose of Graphics object tmpgDispose(); } } // Must be called, but not used public bool tnCallbackMethod() { return false; } Now we run the application and open Neel01jpg If we click theCreate Thumbnail menu item, the new thumbnail image looks like Figure 77
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Figure 77 A thumbnail image
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732 Rotating and Flipping Images
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Rotating and flipping are common operations in many imaging programs Rotation rotates an image at an angle that is a multiple of 90 Flipping reflects an image on an axis The RotateFlip method allows us to rotate and flip images The value ofRotateFlip is of type RotateFlipType enumeration, which defines the direction of rotation and flipping The members of the RotateFlipType enumeration (listed in Table 75) are easy to understand To rotate and/or flip an image, call RotateFlip and pass in any of the values inTable 75 The following code snippets show different rotation and flip options
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Rotating 90 degrees: curImageRotateFlip(RotateFlipTypeRotate90FlipNone); Rotating 180 degrees: curImageRotateFlip(RotateFlipTypeRotate180FlipNone); Rotating 270 degrees: curImageRotateFlip(RotateFlipTypeRotate270FlipNone);
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Flipping on the x-axis only, with no rotation: curImageRotateFlip(RotateFlipTypeRotateNoneFlipX); Flipping on the y-axis only, with no rotation: curImageRotateFlip(RotateFlipTypeRotateNoneFlipY); Flipping on the x- and y-axes, with no rotation: curImageRotateFlip(RotateFlipTypeRotateNoneFlipXY); Rotating 180 degrees and flipping on the x-axis: curImageRotateFlip(RotateFlipTypeRotate180FlipX);
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733 Adding Rotate and Flip Options to the Image Viewer
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Now let's add rotate and flip options to the ImageViewer application We add four submenus to the Options menu Rotate, Flip, Fit, and Zoom We will cover theRotate and Flip options in this section, andFit and Zoom in Sections 734 and 735, respectively
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Table 75 RotateFlipType members
Member Rotate180FlipNone Rotate180FlipX Rotate180FlipXY Rotate180FlipY Rotate270FlipNone Rotate270FlipX Rotate270FlipXY Rotate270FlipY Rotate90FlipNone Rotate90FlipX Rotate90FlipXY Rotate90FlipY RotateNoneFlipNone RotateNoneFlipX RotateNoneFlipXY RotateNoneFlipY 180-degree rotation without flipping 180-degree rotation with a horizontal flip 180-degree rotation with horizontal and vertical flips 180-degree rotation with a vertical flip 270-degree rotation without flipping 270-degree rotation with a horizontal flip 270-degree rotation with horizontal and vertical flips 270-degree rotation with a vertical flip 90-degree rotation without flipping 90-degree rotation with a horizontal flip 90-degree rotation with horizontal and vertical flips 90-degree rotation with a vertical flip No rotation and no flipping No rotation, with a horizontal flip No rotation, with horizontal and vertical flips No rotation, with a vertical flip Description
We add three items to the Rotate submenu: 90, 180, and 270 (see Figure 78) These items rotate an image 90, 180, and 270 degrees, respectively You can add as many items as you want You can even allow users to enter an arbitrary angle