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For the sake of keeping the exercise focused, some aspects of this project are not exactly as you would design them in the real world. For example, you typically would want to give the calling application the option of specifying colors for different sections, which could be done by adding a Color object to the PieChartElement class. In addition, elements of robust programming such as catching exceptions, validating input, and asserting are omitted from the examples.
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3. You need to track the color in use. Before the foreach loop, initialize an integer to zero to act as a counter:
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' VB Dim colorNum As Integer = 0 // C# int colorNum = 0;
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4. Within the foreach loop that calls DrawPie, add two lines: one to create a new Brush object, and a second to call the Graphics.FillPie method. Call Graphics.FillPie immediately before you call Graphics.DrawPie so that the outline is drawn over the filled pie. The following code uses the LinearGradientBrush class, which requires adding the System.Drawing.Drawing2D namespace to the project. Changes are shown in bold:
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' VB ' Draw each of the pie shapes For Each e As PieChartElement In elements ' Create a brush with a nice gradient Dim b As Brush = New LinearGradientBrush( _ rect, colors(colorNum), Color.White, 45) colorNum += 1 ' Calculate the degrees that this section will consume ' based on the percentage of the total Dim sweepAngle As Single = (e.value / total) * 360
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' Draw the filled-in pie shapes g.FillPie(b, rect, startAngle, sweepAngle) ' Draw the pie shape g.DrawPie(p, rect, startAngle, sweepAngle) ' Calculate the angle for the next pie shape by adding ' the current shape's degrees to the previous total. startAngle += sweepAngle Next // C# // Draw each of the pie shapes foreach (PieChartElement e in elements) { // Create a brush with a nice gradient Brush b = new LinearGradientBrush( rect, colors[colorNum++], Color.White, (float)45); // Calculate the degrees that this section will consume // based on the percentage of the total float sweepAngle = (e.value / total) * 360; // Draw the filled-in pie shapes g.FillPie(b, rect, startAngle, sweepAngle); // Draw the pie shape outlines g.DrawPie(p, rect, startAngle, sweepAngle); // Calculate the angle for the next pie shape by adding // the current shape's degrees to the previous total. startAngle += sweepAngle; }
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5. Now, run the application. Experiment with different brush types to find the one that is most appealing. Notice that the lines appear a bit jagged; you can make the lines appear smoother by setting Graphics.SmoothingMode, as the following line demonstrates:
' VB g.SmoothingMode = SmoothingMode.HighQuality // C# g.SmoothingMode = SmoothingMode.HighQuality;
Lesson Summary
The System.Drawing namespace provides tools for drawing graphics and editing existing images. The most useful classes are Graphics, Image, and Bitmap. Use the Point and Size classes to specify the location and size of controls.
Lesson 1: Drawing Graphics
The System.Drawing.Color structure provides predefined properties for common colors. To draw lines and shapes, create an instance of the Graphics class, create a Pen object, and then call one of the Graphics member methods to draw a line or a shape using the Pen instance. Pens can be customized by adding endcaps or changing the line pattern to various combinations of dots and dashes. To draw solid shapes, create an instance of the Graphics class, create a Brush object, and then call one of the Graphics member methods to draw the shape using the Brush instance.
Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 1, Drawing Graphics. The questions are also available on the companion CD if you prefer to review them in electronic form.
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