Figure 154 A graphics copyright application in .NET

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Figure 154 A graphics copyright application
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After adding the controls, we add a reference to the SystemDrawingImaging namespace to the application Then we add a class Image variable to the application as follows:
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Image origImage; The File | Open menu allows us to browse images and view a thumbnail of a specific image The code for the menu click event handler is given in Listing 156 After reading the name of the image, we create anImage object from the file name using theImageFromFile static method After creating one Image object, we create anotherImage object using the GetThumbnailImage method of the Image class GetThumbnailImage returns a thumbnail image After that we simply set theImage property of PictureBox to display the image
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Listing 156 Browsing images
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private void menuItem2_Click(object sender, SystemEventArgs e) { // Open file dialog
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OpenFileDialog fileDlg = new OpenFileDialog(); fileDlgInitialDirectory = "c:\\" ; fileDlgFilter= "All files (**)|**"; fileDlgFilterIndex = 2 ; fileDlgRestoreDirectory = true ; if(fileDlgShowDialog() == DialogResultOK) { // Create image from file string fileName = fileDlgFileNameToString(); origImage = ImageFromFile(fileName); // Create thumbnail image Image thumbNail = origImageGetThumbnailImage(100, 100, null, new IntPtr()); // View image in picture box pictureBox1Image = thumbNail; } } If we run the application and open a file using the Open menu item, the image will be displayed The output looks likeFigure 155
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Figure 155 Thumbnail view of an image
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Once the image has been loaded, we click the Add Copyright button and let the program do its work Basically we need to create an image on the fly, add text to the image using the DrawString method, and then save the image To give the text a different shade, we need to change the color of the pixels that draw the text In other words, we must change the brightness of the pixels that represent the text to distinguish the text pixels from the image pixels We increase the values for the red, green, and blue component of the color by 25 to brighten the text pixels We use the MeasureString method of the Graphics class to set the size and font of the text (We discussedMeasureString in detail in 3) The maximum value for each of the red, green, and blue components of a color is 255 What happens if these values are already set to 255 Do we still increase their value by 25 No In that case we cheat and don't touch these pixels In most cases this approach works because there is always a pixel that is totally different in brightness One additional thing we could do would be to analyze the image, determine whether it's a dark or bright image, and adjust it accordingly To find out which pixels to change, we create a second bitmap that is the same size as the original image We write "Add Copyright Info" on this image and use it as the pattern for the main image We also want to use the largest font we can to create a big word across the image Of course, the image can be any size, so we can predict
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the font size To do this we create a graphics class based on our pattern image and use the MeasureString method until we get a font that fits the graphic, as in Listing 157
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Listing 157 Adding the copyright text
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while(foundfont==false) { Font fc = new Font("Georgia", fntSize, SystemDrawingFontStyleBold); sizeofstring = new SizeF(imgWidth,imgHeight); sizeofstring = gMeasureString("Copyright GDI+ Inc,",fc); if (sizeofstringWidth<patternWidth) { if (sizeofstringHeight<patternHeight) { foundfont=true; gDrawString("Copyright GDI+ Inc,", fc, new SolidBrush(ColorBlack), 1, 15); } } else fntSize = fntSize - 1; } The complete code for the Add Copyright button click event handler is given inListing 158 We read the image size and create aBitmap object from the original size of the image Then we create a Graphics object on the fly using thisBitmap object Once the pattern bitmap has been created, all we have to do is loop through all the pixels and if a pixel is black (which means that it's part of the word), we go to the main image and increase its brightness, producing a glasslike effect
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