Figure 1217 The Draw Chart button click in action in .NET framework

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Figure 1217 The Draw Chart button click in action
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Figure 1218 The Fill Chart button click in action
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We call the DrawPieChart method from our Draw Chart and Fill Chart buttons with a single argument false or true, respectively as shown in Listing 1212
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Listing 1212 The Draw Chart and Fill Chart button click handlers
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private void DrawChart_Click(object sender, SystemEventArgs e) { DrawPieChart(false); } private void FillChart_Click(object sender, SystemEventArgs e) { DrawPieChart(true); }
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SUMMARY
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In this chapter we discussed how to use GDI+ drawing functionality in Web applications We started by discussing the basic process of drawing graphics shapes and images on the Web using ASPNET and GDI+ After that we discussed the drawing process for Web applications, and how it differs from the Windows drawing process Next we introduced ASPNET and how to write a simple ASPNET application using a text editor or Visual Studio NET Then we discussed how to draw simple graphics objects such as lines, curves, rectangles, and images on the Web After drawing simple graphics objects, you learned how to set the quality and transparency of images At the end of the chapter we saw line chart and pie chart applications, as real-world examples of GDI+ on the Web Performance is a major factor that developers worry about when dealing with graphics 13 is dedicated to GDI+ performance In it, we will discuss how to optimize GDI+ applications for the best performance
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13 GDI+ Best Practices and Performance Techniques
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It must be said that code optimization skill and knowledge of performance techniques are best acquired from the shared experiences of other developers With the ever expanding capabilities of Internet communication, the best resources are online forums, newsgroups, and sites dedicated to code sharing A recommended resource for topics covered in this chapter (and indeed throughout this book) is the C# Corner site (http://wwwc-sharpcornercom) Let's start with an introduction of the basic architecture of drawing (rendering or painting) within Windows Forms using GDI+ By the end of this chapter, you will be armed with GDI+ tips and tricks that make a significant difference in the efficiency of many performance-oriented graphics applications Note, however, that these tips and tricks may not be applicable for Web applications Here are the topics that we will discuss in this chapter:
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Understanding the drawing and rendering process How to write paint event handlers for Windows Forms and controls Disposing of graphics objects The OnPaintBackground method Drawing performance and the role of variables' scope and type Double buffering The SetStyle method Generic tips and tricks for quality and performance
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131 Understanding the Rendering Process
In previous chapters of this book, you learned how to draw graphics shapes, curves, and images In all of these cases, the Graphics object is responsible for the drawing When we're drawing graphics objects from within a menu or button click event handler, a call to the Invalidate method becomes imperative If we don't call this method, the form will not paint itself, but if we write the same code on a form's OnPaint or paint event handler, there is no need to invalidate the form In this section we will find out why that's so
1311 Understanding the Paint Event
Paint event functionality is defined in the SystemWindowsFormsControl class, which is the base class for Windows Forms controls such as Label, ListBox, DataGrid, and TreeView A paint event is fired when a control is redrawn The Form class itself is inherited from the Control class Figure 131 shows the Form class hierarchy