generating labels with barcode in c# using crystal reports GRA PHICS AN D G RAPHIC AL US ER INTERFA CES in VB.NET

Maker QR in VB.NET GRA PHICS AN D G RAPHIC AL US ER INTERFA CES

CHAPTER 11 GRA PHICS AN D G RAPHIC AL US ER INTERFA CES
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Drawing Rectangles with Rounded Corners
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In the previous examples, every rectangle was drawn with the corner radius values set to 0, so the rectangles were not drawn with rounded corners. Figure 11-4 shows a rectangle with rounded corners using the same corner radius of 30 pixels for x and y. The rectangle shown in Figure 11-5 was produced using different corner radius values for x and y.
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Figure 11-4. Rectangle with a corner radius of 30 pixels for x and y
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Figure 11-5. Rectangle with a 10-pixel x radius and 30-pixel y radius
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Caution The current release of the .NET Micro Framework does not allow you to use rounded corners
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and filling with rectangles at the same time. If you indicate a corner radius greater than zero, your rectangle will be drawn as a frame.
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Drawing Rectangles with Color Gradients
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In the preceding examples, all filled rectangles were drawn entirely filled with one color. By specifying different values for the start and end colors, you can achieve interesting color gradient effects. The code in Listing 11-5 produces a rectangle filled with a diagonal color gradient that starts in the top-left corner of the rectangle with white and ends in the bottom-right corner with black, as shown in Figure 11-6.
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C HAPT ER 11 GRAPHICS AND GRA PHICA L USE R IN TERFA CES
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Figure 11-6. Diagonal color gradient Listing 11-5. Drawing a Diagonal Color Gradient bmp.DrawRectangle(Color.White, 1, 100, 100, 200, 100, 0, 0, Color.White, 100, 100, Color.Black, 100 + 200, 100 + 100, Bitmap.OpacityOpaque); // // // // // // // // // // outline color outline thickness x and y of top left corner width and height x and y corner radius gradient start color gradient start coordinates gradient end color gradient end coordinates opacity
By specifying the same x coordinate for the gradient start and end colors, you achieve a vertical color gradient, as illustrated in Figure 11-7. Using the same y coordinate for start and end colors, you will produce a horizontal color gradient. The gradient start and end coordinates are specified as screen coordinates, and they can lie outside of the rectangle. This causes the system to produce a color gradient starting at the start point with the start color and ending at the end point with the end color but showing only the part within your rectangle.
Figure 11-7. Vertical color gradient
CHAPTER 11 GRA PHICS AN D G RAPHIC AL US ER INTERFA CES
Drawing Ellipses
The Bitmap class exposes the DrawEllipse method, which allows you to draw an ellipse. The method accepts a center point and x and y radii: public void DrawEllipse(Color colorOutline, int x, int y, int xRadius, int yRadius);
Caution There is a second overload of the DrawEllipse method that accepts a thickness for the
outline, color gradient settings, and an opacity value. With the present release of the .NET Micro Framework, none of these additional parameters work. You should not use this method. That means that, currently, you cannot draw filled circles or ellipses. If you need to render filled ellipses, a good but less flexible idea is to create a bitmap, add it to your application as a resource, and render it to the screen as we will discuss in the next section.
Drawing Images
In the following sections, you will learn how to draw one bitmap on another using different methods and techniques.
Drawing Full-Size Images
The Bitmap class provides a DrawImage method, which allows one bitmap to draw a part or all of another bitmap on itself. The code in Listing 11-6 gets a bitmap from a resource, as explained in 10 s discussion about globalization and localization. Then, the entire ball bitmap is rendered in its original size using the DrawImage method (see Figure 11-8). This method allows you to draw either the entire source image or only a part of it by varying the source coordinates and size. This kind of drawing does not perform any scaling; scaling an image is discussed in the next section. Using the opacity parameter, the entire source image can be blended with the destination image. Later in this chapter, we ll discuss how you can render an image with a transparent background. Listing 11-6. Rendering the Full-Size Ball Image ScreenMetrics metrics = ScreenMetrics.GetMetrics(); Bitmap bmp = new Bitmap(metrics.Width, metrics.Height); Bitmap soccerBall = Resources.GetBitmap(Resources.BitmapResources.SoccerBall); bmp.DrawImage(100, 50, // destination coordinates soccerBall, // source image 0, 0, // source coordinates soccerBall.Width, // source width soccerBall.Height, // source height Bitmap.OpacityOpaque); // opacity bmp.Flush();
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