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Listing 121 The button click event handler
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private void Button1_Click(object sender, SystemEventArgs e) { Image1ImageUrl = TextBox1Text; } Now compile and run the project In the text box we type "http://wwwc-sharpcornercom/cslogo101gif" (or any valid image URL) as the URL name and click the View Image button The output of the program looks like Figure 128
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Figure 128 Viewing an image in an Image control
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Now that we have seen how to create a simple Web application using Visual Studio NET and ASPNET, in the next section we will move on to GDI+ and show how to use GDI+ to write graphics Web applications
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122 Your First Graphics Web Application
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Now it's time to use GDI+ in Web applications First we'll write some code, and then we'll discuss how GDI+ Web applications work In this application we will draw a few simple graphics objects, including lines and rectangles First we create a Web Application using Visual Studio NET After creating a Web application, we need to add a GDI+-related namespace to the project We import namespaces as follows:
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using SystemDrawing; using SystemDrawingDrawing2D; using SystemDrawingImaging;
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Note
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See 1 to learn more about GDI+ namespaces and classes If you use Visual Studio NET to create your Web application, the wizard will add System and SystemDrawing namespace references automatically
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Now we add code to draw graphics objects Listing 122 draws two lines and a rectangle You can write the code on the page-load event handler or on a button click event handler
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Listing 122 Drawing simple graphics objects on the Web
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private void Page_Load(object sender, SystemEventArgs e) { // Create pens and brushes Pen redPen = new Pen(ColorRed, 3); HatchBrush brush = new HatchBrush(HatchStyleCross, ColorRed, ColorYellow); // Create a Bitmap object Bitmap curBitmap = new Bitmap(200, 200); // Create a Graphics object from Bitmap Graphics g = GraphicsFromImage(curBitmap); // Draw and fill rectangles gFillRectangle(brush, 50, 50, 100, 100); gDrawLine(PensWhiteSmoke, 10, 10, 180, 10); gDrawLine(PensWhite, 10, 10, 10, 180); // Save the Bitmap object and send response to the // browser
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curBitmapSave(ResponseOutputStream, ImageFormatJpeg); // Dispose of Graphics and Bitmap objects curBitmapDispose(); gDispose(); } We will discuss this code in more detail in the following section If you are using a text editor to write your applications, you can write the code given in Listing 123
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Listing 123 Using a text editor to draw simple graphics
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<%@ Import Namespace="System" %> <%@ Import Namespace="SystemDrawing" %> <%@ Import Namespace="SystemDrawingDrawing2D" %> <%@ Import Namespace="SystemDrawingImaging" %> <script language="C#" runat="server"> void Page_Load(Object sender, EventArgs e) { Pen redPen = new Pen(ColorRed, 3); HatchBrush brush = new HatchBrush(HatchStyleCross, ColorRed, ColorYellow); Bitmap curBitmap = new Bitmap(200, 200); Graphics g = GraphicsFromImage(curBitmap); gFillRectangle(brush, 50, 50, 100, 100); gDrawLine(PensWhiteSmoke, 10, 10, 180, 10); gDrawLine(PensWhite, 10, 10, 10, 180); curBitmapSave(ResponseOutputStream, ImageFormatJpeg); gDispose(); } </script> Now when we run our application, the output generated by Listing 122 or 123 should look like Figure 129
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Figure 129 Drawing simple graphics objects on the Web
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1221 How Does It Work
Let's break down the code shown in Listings 122 and 123 We begin by importing GDI+-related namespaces in the application: System, SystemDrawing, SystemDrawingDrawing2D, and SystemDrawingDrawingImaging If we were using Visual Studio NET, we would simply use the using directive followed by the namespace name Next we have a Page_Load event, which is executed when a Web page is loaded We create a pen and brush using the and HatchBrush Pen classes
Pen redPen = new Pen(ColorRed, 3); HatchBrush brush = new HatchBrush(HatchStyleCross, ColorRed, ColorYellow); One important limitation of Web applications is Web browser capability A Web browser can display only certain objects For example, all graphics objects in a Web browser will be displayed as images So before a Web browser can display graphics objects, we need to convert them into images that can be displayed by the browser Our next step, then, is to create a Bitmap object The following line creates a 200x200 Bitmap object
Bitmap curBitmap = new Bitmap(200, 200); You already know that the Graphics object functions as a canvas and provides members to draw lines, shapes, and images Now we need to create a Graphics object from the bitmap:
Graphics g = GraphicsFromImage(curBitmap); Once we have a Graphics object, we can draw shapes, lines, and images In the following code we use the DrawLine and FillRectangle methods to draw lines and a filled rectangle:
gFillRectangle(brush, 50, 50, 100, 100); gDrawLine(PensWhiteSmoke, 10, 10, 180, 10); gDrawLine(PensWhite, 10, 10, 10, 180); If you don't know how draw and fill methods work, you may want to look again at 3 We're almost done So far we have created Bitmap and Graphics objects, and we have drawn lines and a rectangle Because a Web browser can display only images (not pixels), we need to convert the bitmap into an image The Save method of the Bitmap object does the trick for us The following line is responsible for rendering a bitmap and sending it to the browser:
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curBitmapSave(ResponseOutputStream, ImageFormatJpeg); Finally, we dispose of theBitmap and Graphics objects:
curBitmapDispose(); gDispose();