Lesson 3: Formatting Text in Visual C#

Making QR Code in Visual C# Lesson 3: Formatting Text

sf.Alignment = StringAlignment.Near sf.LineAlignment = StringAlignment.Center ' Draw the text g.DrawString(e.name + ": " + e.value.ToString(), tf, tb, textRect, sf) ' Increment the current vertical location currentVert += vert Next // C# // Start the legend five pixels from the top of the rectangle int currentVert = 5; int legendColor = 0; foreach (PieChartElement e in elements) { // Create a brush with a nice gradient Rectangle thisRect = new Rectangle(lRectCorner.X + buffer, currentVert + buffer, legendWidth, legendHeight); Brush b = new LinearGradientBrush(thisRect, colors[legendColor++], Color.White, (float)45); // Draw the legend box fill and border g.FillRectangle(b, thisRect); g.DrawRectangle(lp, thisRect); // Define the rectangle for the text RectangleF textRect = new Rectangle(textX, currentVert + buffer, textWidth, legendHeight); // Define the font for the text Font tf = new Font("Arial", 12); // Create the foreground text brush Brush tb = new SolidBrush(Color.Black); // Define the vertical and horizontal alignment for the text StringFormat sf = new StringFormat(); sf.Alignment = StringAlignment.Near; sf.LineAlignment = StringAlignment.Center; // Draw the text g.DrawString(e.name + ": " + e.value, tf, tb, textRect, sf); // Increment the current vertical location currentVert += vert; }

6. Run the application to verify that it works. With the legend added, more of the copyright text now overlaps with the pie chart, demonstrating the effectiveness of the black background.

6

To add text to graphics, create a Graphics object, create a Font object, optionally create a Brush object, and then call the Graphics.DrawString method. To create a Font object, pass the font family name, font size, and font style. Write text by calling the Graphics.DrawString method. The DrawString method requires a Font object, a Brush object that specifies the color of the text, and the location to draw the text. Use the StringFormat class to control the formatting of text. You can use this class to change the direction of the text, or to change the alignment of text.

You can use the following questions to test your knowledge of the information in Lesson 3, Formatting Text. The questions are also available on the companion CD if you prefer to review them in electronic form.

Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.

1. What are the steps for adding text to an image A. Create a Graphics object and a string object. Then call string.Draw. B. Create a Graphics object, a Font object, and a Brush object. Then call Graphics .DrawString. C. Create a Graphics object, a Font object, and a Pen object. Then call Graphics .DrawString. D. Create a Bitmap object, a Font object, and a Brush object. Then call Bitmap .DrawString. 2. Which of the following is a class would you need to create an instance of to specify that a string should be centered when drawn A. StringFormat B. StringAlignment C. FormatFlags D. LineAlignment

3. Which of the following commands would cause a string to be flush left A. StringFormat.LineAlignment = Near B. StringFormat.LineAlignment = Far C. StringFormat.Alignment = Near D. StringFormat.Alignment = Far

To further practice and reinforce the skills you learned in this chapter, you can complete the following tasks:

Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create solutions. Complete the suggested practices. Take a practice test.

Summary

To draw graphics, create two objects: a Pen object and a Graphics object. Use the Pen object to define the color and width of the drawing. The Graphics object exposes methods for drawing lines and shapes. To fill in shapes, use a Brush object with a Graphics object. To work with images, use the Image and Bitmap classes. To edit images, create a Graphics object based on the Image or Bitmap object. To add text to an image or graphic, create Font and Brush objects. Then call Graphics.DrawString. To format the text, use the StringFormat class.