Figure 742 Saving images with different sizes in VS .NET

Creator Code 128 Code Set C in VS .NET Figure 742 Saving images with different sizes
Figure 742 Saving images with different sizes
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First we specify an Image private variable:
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private Image curImage; Then we create and view the image at the form's paint event handler, as shown in Listing 728
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Listing 728 Viewing an image
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { curImage = ImageFromFile("rosesjpg"); eGraphicsDrawImage(curImage, AutoScrollPositionX, AutoScrollPositionY, curImageWidth, curImageHeight ); } On the Save Image button click, we ask the user to specify a file name and we call the Save method of the Image class, which saves an image in the given format As Listing 729 shows, we also read the size of the new image fromtextBox1 and textBox2 and specify the size when we create a new Bitmap object from the existing image
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Listing 729 Saving an image with the given size
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private void SaveImageBtn_Click(object sender, SystemEventArgs e) { if(curImage == null) return; int height = ConvertToInt16(textBox1Text); int width = ConvertToInt16(textBox2Text); SaveFileDialog saveDlg = new SaveFileDialog(); saveDlgTitle = "Save Image As"; saveDlgOverwritePrompt = true; saveDlgCheckPathExists = true; saveDlgFilter = "Bitmap File(*bmp)|*bmp|Gif File(*gif)|*gif| " + "JPEG File(*jpg)|*jpg"; saveDlgShowHelp = true; if(saveDlgShowDialog() == DialogResultOK) { string fileName = saveDlgFileName; string extn = fileNameSubstring(fileNameLength - 3, 3); Bitmap newImage = new Bitmap(curImage, new Size(width, height)); if(extnEquals("bmp")) newImageSave(fileName,ImageFormatBmp); else if(extnEquals("gif")) newImageSave(fileName,ImageFormatGif); else if(extnEquals("jpg")) newImageSave(fileName,ImageFormatJpeg); } } Now we save an image with a width of 200 and a height of 200 The results are shown in Figure 743
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Figure 743 New image, with width of 200 and height of 200
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SUMMARY
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GDI+ provides a significant improvement in imaging over GDI In this chapter we discussed the basic imaging capabilities of GDI+, as defined in the SystemDrawing namespace We focused mainly on theImage and Bitmap classes, and by now you should understand how to use the NET Framework to work with images We saw how to open, view, save, and manipulate images We also saw some interesting functionality, including creating thumbnail images, rotating and flipping, zooming in and out, skewing and stretching, and animation In addition, we covered some advanced imaging features, including drawing transparent images and setting bitmap resolution and color Throughout this chapter, we developed a real-world application that you can use in your programming career Imaging functionality doesn't end here Advanced imaging functionality, which is defined in the SystemDrawingImaging namespace, will be the focus of 8 Some of the topics yet to be discussed are bitmaps, metafiles, color maps, encoding and decoding images, and details of the color matrix
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8 Advanced Imaging
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In 7 we discussed the imaging functionality defined in theSystemDrawing namespace This chapter will cover the advanced imaging functionality defined in the SystemDrawingImaging namespace We will explore how to implement this functionality in our applications The topics will include
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Understanding LockBits and UnlockBits Working with metafiles and metafile enhancements Working with the color matrix, color map, and color palette Using the Encoder and EncoderCollection classes An overview of tagged data in TIFF files Converting metafiles
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81 Rendering Partial Bitmaps
In 7 we saw that theBitmap class provides the LockBits and UnlockBits methods, but we didn't get to use them LockBits and UnlockBits lock and unlock bitmap pixels in system memory Each call to LockBits should be followed by a call toUnlockBits Why might you want to lock bitmap pixels Rendering (painting) bitmaps and images is a resource-consuming operation, and it is one of the most frequently performed graphics operations Suppose you want to change the color or intensity level of a bitmap You could always loop though the bitmap pixel by pixel and use SetPixel to modify its properties, but that is a huge time- and resource-consuming operation