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Last but not least is the LinearGradientBrush type, which you can use whenever you want to blend two colors together in a gradient pattern. Working with this type is just as simple as working with the other brush types. The only point of interest is that when you build a LinearGradientBrush, you need to specify a pair of Color types and the direction of the blend via the LinearGradientMode enumeration: public enum LinearGradientMode { Horizontal, Vertical, ForwardDiagonal, BackwardDiagonal } To test each value, let s render a series of rectangles using a LinearGradientBrush: private void MainForm_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; Rectangle r = new Rectangle(10, 10, 100, 100); // A gradient brush. LinearGradientBrush theBrush = null; int yOffSet = 10; // Get all members of the LinearGradientMode enum. Array obj = Enum.GetValues(typeof(LinearGradientMode)); // Draw an oval with a LinearGradientMode member. for(int x = 0; x < obj.Length; x++) { // Configure Brush. LinearGradientMode temp = (LinearGradientMode)obj.GetValue(x); theBrush = new LinearGradientBrush(r, Color.GreenYellow, Color.Blue, temp); // Print name of LinearGradientMode enum. g.DrawString(temp.ToString(), new Font("Times New Roman", 10), new SolidBrush(Color.Black), 0, yOffSet); // Fill a rectangle with the correct brush. g. FillRectangle(theBrush, 150, yOffSet, 200, 50); yOffSet += 80; } } Figure 20-17 shows the end result.

At this point, you have examined how to manipulate three of the four major GDI+ types: fonts, pens, and brushes. The final type you ll examine in this chapter is the Image class and related subtypes. The abstract System.Drawing.Image type defines a number of methods and properties that hold various bits of information regarding the underlying image data it represents. For example, the Image class supplies the Width, Height, and Size properties to retrieve the dimensions of the image. Other properties allow you to gain access to the underlying palette. The Image class defines the core members shown in Table 20-8. Table 20-8. Members of the Image Type

FromFile() FromStream() Height Width Size HorizontalResolution VerticalResolution Palette GetBounds() Save()

Several CSS properties allow for percentages as values. A percentage in CSS is indicated as a decimal number in the range 0 100 followed by a percent symbol (%).

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This static method creates an Image from the specified file. This static method creates an Image from the specified data stream. These properties return information regarding the dimensions of this Image.

Type: Lists the variable type (read-only).

This property returns a ColorPalette data type that represents the underlying palette used for this Image. This method returns a Rectangle that represents the current size of this Image. This method saves the data held in an Image-derived type to file.

Given that the abstract Image class cannot be directly created, you typically make a direct instance of the Bitmap type. Assume you have some Form-derived class that renders three bitmaps

into the client area. Once you fill the Bitmap types with the correct image file, simply render each one within your Paint event handler using the Graphics.DrawImage() method: public partial class MainForm : Form { private Bitmap[] myImages = new Bitmap[3]; public MainForm() { // Load some local images. myImages[0] = new Bitmap("imageA.bmp"); myImages[1] = new Bitmap("imageB.bmp"); myImages[2] = new Bitmap("imageC.bmp"); CenterToScreen(); InitializeComponent(); } private void MainForm_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; // Render all three images. int yOffset = 10; foreach (Bitmap b in myImages) { g.DrawImage(b, 10, yOffset, 90, 90); yOffset += 100; } } }

Five position keywords as available as values for several properties: left, right, center, top, and bottom.

The *.bmp files used in this example must be in the same folder as the application (or specified using hard-coded paths). We ll resolve this limitation later in this chapter.

The Watch window (Figure 1-16) appears automatically when watch expressions are defined in the project (Figure 1-17).

Finally, be aware that regardless of its name, the Bitmap class can contain image data stored in any number of file formats (*.tif, *.gif, *.bmp, etc.).

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