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Using the same method, you can easily add printing functionality to the GDI+ editor You can add a menu item called Print to the editor that will print an opened text file
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117 Printing Graphics
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We just saw how to print text files Now let's talk about how to print images and graphics items such as lines, rectangles, and ellipses You probably have a pretty good idea how printing works It's all in the magic of the Graphics object available through PrintPageEventArgs Once we have a printer's Graphics object, we call draw and fill methods to print graphics items In this section we will create an application that shows how to print simple graphics objects, including lines, curves, rectangles, and images Again, we create a Windows application and add a main menu to the form We add four menu items to the main menu The final form looks like Figure 1113 As you might guess, theDraw Items and View Image menu items will draw graphics objects and show an image, respectively The Print Image and Print Graphics Items menu items will print the image and the graphics items, respectively
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Figure 1113 A graphics-printing application
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The next step is to add a reference to the SystemDrawingPrinting namespace
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1171 Printing Graphics Items
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Let's write code for the menu items We'll do the Draw Items first, as in Listing 1124 This menu item draws two lines, a rectangle, and an ellipse First we create a Graphics object using the FormCreateGraphics method and call the DrawLine, DrawRectangle, and FillEllipse methods See 3 for more on these methods
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Listing 1124 Drawing graphics items
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private void DrawItems_Click(object sender, SystemEventArgs e) { // Create a Graphics object Graphics g = thisCreateGraphics(); gClear(thisBackColor); // Draw graphics items gDrawLine(PensBlue, 10, 10, 10, 100); gDrawLine(PensBlue, 10, 10, 100, 10); gDrawRectangle(PensYellow, 20, 20, 200, 200); gFillEllipse(BrushesGray, 40, 40, 100, 100); // Dispose of object gDispose(); } Figure 1114 shows the output from Listing 1124
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Figure 1114 Drawing simple graphics items
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Now let's write code for Print Graphics Items We want to print the output shown inFigure 1114 We create a PrintDocument object, add a PrintPage event handler, and call thePrint method The PrintPage event handler draws the graphics items Listing 1125 contains two methods The PrintGraphicsItems_Click method is a menu click event handler that creates a PrintDocument object, sets its PrintPage event, and calls the Print method The second method, PrintGraphicsItemsHandler, simply calls the draw and fill methods of PrintPageEventArgsGraphics
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Listing 1125 Printing graphics items
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private void PrintGraphicsItems_Click(object sender, SystemEventArgs e) { // Create a PrintDocument object PrintDocument pd = new PrintDocument(); // Add PrintPage event handler pdPrintPage += new PrintPageEventHandler (thisPrintGraphicsItemsHandler); // Print pdPrint(); } private void PrintGraphicsItemsHandler(object sender, PrintPageEventArgs ppeArgs) { // Create a printer Graphics object Graphics g = ppeArgsGraphics; // Draw graphics items gDrawLine(PensBlue, 10, 10, 10, 100); gDrawLine(PensBlue, 10, 10, 100, 10); gDrawRectangle(PensYellow, 20, 20, 200, 200); gFillEllipse(BrushesGray, 40, 40, 100, 100); } If you run the application and click on Print Graphics Items, the printer will generate output that looks likeFigure 1114
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1172 Printing Images
If you did not skip s 7 and 8, then you already know how the DrawImage method of the Graphics object is used to draw images Similarly, the DrawImage method of PrintPageEventArgsGraphics prints an image to the printer, which then prints that image onto paper Before we add code for the View Image menu item, we need to add two application scope variables as follows:
private Image curImage = null; private string curFileName = null; View Image lets us browse for an image and then draws it on the form As Listing 1126 shows, we create a Graphics object using FormCreateGraphics Then we use OpenFileDialog to browse files on the system Once a file has been selected, we create the Image object by using ImageFromFile, which takes the file name as its only parameter Finally, we use DrawImage to draw the image
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