Figure 78 Rotate menu items in .NET framework

Generate Code 128B in .NET framework Figure 78 Rotate menu items
Figure 78 Rotate menu items
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Now we add three items to the Flip submenu: FlipX, FlipY, and FlipXY (see Figure 79) These items flip an image about thex-, y-, and xy-axes, respectively You can add more items if you wish
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Figure 79 Flip menu items
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Within our program we give the menu items meaningful names For example, the 90, 180, and 270 menu items are represented by Rotate90Menu, Rotate180Menu, and Rotate270Menu, respectively And we useFlipXMenu, FlipYMenu, and FlipXYMenu to represent the FlipX, FlipY, and FlipXY menu items, respectively The next step is to write code for the menu item event handlers To add them, we simply double-click on the menu items The code for the Rotate menu items is given in Listing 77 We check whether the Image object has been created and then callRotateFlip with the appropriate value We also call Invalidate to redraw the image with the new settings
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Listing 77 Rotate menu item event handlers
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// Rotate 90 degrees private void Rotate90Menu_Click(object sender, SystemEventArgs e) { if(curImage != null) { curImageRotateFlip( RotateFlipTypeRotate90FlipNone); Invalidate(); } } // Rotate 180 degrees private void Rotate180Menu_Click(object sender, SystemEventArgs e) { if(curImage != null) { curImageRotateFlip( RotateFlipTypeRotate180FlipNone); Invalidate(); } } // Rotate 270 degrees private void Rotate270Menu_Click(object sender, SystemEventArgs e) { if(curImage != null) {
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curImageRotateFlip( RotateFlipTypeRotate270FlipNone); Invalidate(); } } Now let's run and test the application We open an image, and it looks like Figure 710
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Figure 710 An image with default settings
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Selecting Rotate | 90 generates the image shown inFigure 711
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Figure 711 The image of Figure 710, rotated 90 degrees
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Selecting Rotate | 180 generates the image shown inFigure 712
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Figure 712 The imageof Figure 710, rotated 180 degrees
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Selecting Rotate | 270 generates the image shown inFigure 713
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Figure 713 The image of Figure 710, rotated 270 degrees
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We also add code for the Flip menu item click event handlers, as shown in Listing 78 We simply call RotateFlip with an appropriate value
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Listing 78 Flip menu item event handlers
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// Flip X private void FlipXMenu_Click(object sender, SystemEventArgs e) { if(curImage != null) { curImageRotateFlip( RotateFlipTypeRotateNoneFlipX); Invalidate(); } } // Flip Y private void FlipYMenu_Click(object sender, SystemEventArgs e) { if(curImage != null) { curImageRotateFlip( RotateFlipTypeRotateNoneFlipY); Invalidate(); }
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} // Flip X and Y both private void FlipXYMenu_Click(object sender, SystemEventArgs e) { if(curImage != null) { curImageRotateFlip( RotateFlipTypeRotateNoneFlipXY); Invalidate(); } } Now if we flip the image shown in Figure 710, we can see the difference TheFlipX option generates the image shown inFigure 714
Figure 714 The image of Figure 710, flipped in the x-direction
The FlipY option generates the image shown inFigure 715
Figure 715 The image of Figure 710, flipped in the y-direction
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The FlipXY option generates the image shown inFigure 716
Figure 716 The image of Figure 710, flipped in both the x-and the y-directions
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734 Fitting Images
An application that manipulates images often needs to fit them within the height and/or width of a drawing surface A fit-width option sets the width of an image to the width of the surface (a form or a control), and a fit-height option sets the height of an image to the height of the surface The fit-all option sets both the height and the width of an image to the height and width of the surface Let's add fit options to our ImageViewer application We add four menu items to the Fit submenu: Fit Height, Fit Width, Fit Original, and Fit All, which will fit the height, width, original size of the image, and both height and width, respectively (see Figure 717)
Figure 717 Fit menu items
To implement the fit options, we need to add Rectangle and Size variables at the application level, as follows:
private Rectangle curRect; private Size originalSize = new Size(0,0); We will use curRect to store the current rectangle of the image and originalSize for the original size of the image Now we need to modify the OpenFileMenu click event handler The new code is given inListing 79 We activate autoscrolling by setting the AutoScroll and AutoScrollMinSize properties of the form to true We create a rectangle from the current size of the image We also save the current size of the image by setting the Width and Height properties of originalSize