qr code generator c# mvc Figure 6-6 Use the Brush class with the various Graphics.Fill methods to draw solid objects in C#

Printer QR Code in C# Figure 6-6 Use the Brush class with the various Graphics.Fill methods to draw solid objects

Figure 6-6 Use the Brush class with the various Graphics.Fill methods to draw solid objects
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You can draw filled objects with an outline by first calling the Graphics class Fill method, and then calling the Graphics class Draw method. For example, the following code draws a polygon with an outline and a fill pattern, as shown in Figure 6-7:
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' VB Dim g As Graphics = Me.CreateGraphics Dim p As Pen = New Pen(Color.Maroon, 2) Dim b As Brush = New LinearGradientBrush(New Point(1, 1), New Point(100, 100), _ Color.White, Color.Red) Dim points As Point() = New Point() {New Point(10, 10), _ New Point(10, 100), _ New Point(50, 65), _ New Point(100, 100), _ New Point(85, 40)} g.FillPolygon(b, points) g.DrawPolygon(p, points) // C# Graphics g = this.CreateGraphics(); Pen p = new Pen(Color.Maroon, 2); Brush b = new LinearGradientBrush(new Point(1,1), new Point(100,100), Color.White, Color.Red); Point[] points = new Point[] {new Point(10, 10), new Point(10, 100), new Point(50, 65),
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6
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Graphics
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new Point(100, 100), new Point(85, 40)}; g.FillPolygon(b, points); g.DrawPolygon(p, points);
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Figure 6-7
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Combine Graphics.Fill with Graphics.Draw methods to create solid objects with outlines
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You can use the same techniques to draw on controls, such as buttons or the instances of the PictureBox class. If you need to fill an entire Graphics object with a single color, call the Graphics.Clear method.
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Lab: Create a Method to Draw a Pie Chart
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In this lab, you create a method to draw a pie chart, and then improve that method to make the pie chart more visually appealing. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder.
Exercise 1: Draw a Pie Chart
In this exercise, you write a method that draws a pie chart given an array of data and a Size structure. At this point, simple black lines will suffice. 1. Copy the 06\Lesson1-Exercise1-PieChart folder from the companion CD to your hard disk, and open either the C# version or the Visual Basic version of the PieChart project. 2. Examine the form. The form has a single PictureBox named chart that is bound to all four sides of the form. Notice that the Paint event calls the Draw method. 3. Examine the Draw method. This method includes sample data that will be passed as parameters to the drawPieChart method you will complete. Notice that the drawPieChart method returns an Image object, which is used to define the chart PictureBox. 4. Examine the PieChartElement class. This simple class contains information to describe a single section of your pie chart.
Lesson 1: Drawing Graphics
5. Examine the drawPieChart method. It receives two parameters: an ArrayList containing only PieChartElement objects, and a Size structure. 6. Complete the drawPieChart method. First, define a Bitmap object to be returned, create a Graphics object from the Bitmap object, and then return the Bitmap object. For example, the following code would work:
' VB Dim bm As Bitmap = New Bitmap(s.Width, s.Height) Dim g As Graphics = Graphics.FromImage(bm) ' TODO: Draw pie chart in g Return bm // C# Bitmap bm = new Bitmap(s.Width, s.Height); Graphics g = Graphics.FromImage(bm); // TODO: Draw pie chart in g return bm;
7. At this point, the project will compile, but no pie chart is drawn. Before you can create a pie chart from the PieChartElement objects in the ArrayList, you must determine how many degrees each element uses. To do that, you must calculate the total of all the PieChartElement.value objects. For example, the following code would work:
' VB ' Calculate total value of all rows Dim total As Single = 0 For Each e As PieChartElement In elements If e.value < 0 Then Throw New ArgumentException("All elements must have positive values") End If total += e.value Next // C# // Calculate total value of all rows float total = 0; foreach (PieChartElement e in elements) { if (e.value < 0) { throw new ArgumentException("All elements must have positive values"); } total += e.value; }
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