Developing GDI+ Web Applications in Visual Studio .NET

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12 Developing GDI+ Web Applications
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In previous chapters we covered almost every aspect of drawing using Windows Forms This chapter will introduce you to drawing on the Web and show how GDI+ can be used to write powerful graphics Web applications From a programmer's perspective, GDI+ treats both Windows and Web applications in the same way This chapter covers the following topics:
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A quick introduction to ASPNET Developing your first Web application using ASPNET in Visual Studio NET Understanding the process of drawing on the Web Creating Bitmap and Graphics objects Drawing simple rectangles and other graphics objects on Web Forms Drawing images on Web Forms Setting the alpha value and quality of graphics objects Using linear and path gradient brushes on the Web Drawing line charts Drawing and filling pie charts
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If we want to draw a rectangle on the Web, we create a Graphics object and call its DrawRectangle method However, getting a Graphics object for a Web page is different from getting one for a Windows Form, as we will discuss in greater detail later Another restriction in Web applications is the fact that a browser can display only images If we wanted to draw a rectangle on a Web page, the rectangle would first have to be drawn and converted into an image and then sent to the browser for display To draw graphics shapes in a Windows Forms application, we simply call the draw or fill method, and GDI+ draws the shape on the form, as Figure 121 shows
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Figure 121 Drawing in Windows Forms
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Drawing in Web Forms involves one extra step When you call a draw or fill method, GDI+ doesn't communicate directly with the Web Forms Instead, it allows us to save a graphics shape as an image Later we send the image to the browser for display This process is shown in
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Figure 122 Drawing in Web Forms
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After completing this chapter, you will be amazed by the power and flexibility of GDI+ and ASPNET
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121 Creating Your First ASPNET Web Application
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Discussing ASPNET in depth is beyond the scope of this book In this chapter we will take an "as needed" approach, discussing only the techniques we will use in our applications If you are looking for an introductory ASPNET book, try Essential ASPNET by Fritz Onion (published by Addison-Wesley) To understand ASPNET and Visual Studio NET integration, we will write a simple non-GDI+ Web application In this application we will add some controls to a Web page: a generic button, a text box, and an Image button After adding these controls, we will write code in the button click event handler that will read the contents of the text box as a file name and display the file in the Image button Let's get started!
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1211 Creating a Web Application Project
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Creating a new ASPNET Web application using Visual Studio NET is simple: First we create a new project by choosing File | New | Project | Visual C# Projects and then selecting theASPNET Web Application template As Figure 123 shows, we give our application the name FirstWebApp It resides in the GDIPlusGuide folder of localhost, which is the default Web server on our local machine
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Figure 123 The FirstWebApp project
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The Location box displays the default option of http://localhost and the application name Herelocalhost represents the default IIS server running on our local machine The default virtual directory for localhost is C:\Inetpub\wwwroot
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Note
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If you are using a remote server for your development, you'll need to provide your server name instead of localhost You can either create the project in the root of the server or create a new folder
Clicking the OK button creates a new directory, FirstWebApp in the server's virtual directory It also creates a new Web application and sends us to the default WebForm1aspx page (see Figure 124)