barcode label printing in vb.net The Tile Brushes in VB.NET

Printer QR in VB.NET The Tile Brushes

The Tile Brushes
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The parent of both ImageBrush and VideoBrush is TileBrush. This class cannot be instantiated on its own it exists to provide tiling behavior to inheriting classes. There are four properties supported by the TileBrush class, listed in Table 9-11. Each is also a dependency property. Table 9-11. Properties of the System.Windows.Media.TileBrush Class
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Horizontal alignment used for positioning. This can be set to Left, Center, or Right. The default value is Center. Vertical alignment used for positioning. This can be set to Top, Center, or Bottom. The default value is Center.
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CHAPTER 9 GRAPHICS
Stretch
Stretch
Specifies how the contents of the brush fill the bounding space. Possible values are None, Uniform, UniformToFill, and Fill. The default value is Fill.
The ImageBrush
The ImageBrush is a type of TileBrush, which defines its content as an image. Earlier we drew a star using the Path class and filled it with the solid color brush. Instead you can fill up the image by using the image brush as shown in Figure 9-18.
Figure 9-18. Example of image brush The following code snippet shows the related XAML: <Path Stretch="Fill" StrokeThickness="2" StrokeLineJoin="Round" Stroke="Blue" Data="F1 M 0,100 L 150,100 L 200,0 L 250,100 L 400,100 L 266, 150 L 300,300 L 200,170 L 110,300 L 133,150 Z "> <Path.Fill> <ImageBrush ImageSource="penguins.jpg"/> </Path.Fill> </Path>
The Video Brush
The video brush works much like the image brush, but uses a video instead of an image. The VideoBrush class provides methods to play, pause, stop, and seek a different position in the video. The SourceName property of the VideoBrush class must be set to the name of a MediaElement specified in your XAML. You need to set the opacity of the media element to 0 to avoid displaying a media element related video file. Mute the audio of the video file by setting the IsMuted property to true. The following XAML gives an example:
CHAPTER 9 GRAPHICS
<MediaElement x:Name="videoMediaElement" Source="Wildlife.wmv" Opacity="0" /> <Rectangle Width="300" Height="250" Stroke="Red" StrokeThickness="2"> <Rectangle.Fill> <VideoBrush SourceName="videoMediaElement" /> </Rectangle.Fill> </Rectangle>
The Gradient Brushes
There are two gradient brushes that are used to paint with a gradient of colors. The first is the linear gradient brush, used to paint a gradient along a straight line. The second is the radial gradient brush, used to spread colors across an elliptical surface. Both brushes utilize a gradient specified by one or more gradient stops. What a gradient looks like depends on the values of control parameters and gradient stops. Gradient stops specify the color at which a particular gradient ends. It s possible to paint multiple gradients within a surface by using multiple gradient stops. The GradientBrush class forms the base of both the linear and radial gradient brushes. The properties provided by GradientBrush are shown in Table 9-12. Table 9-12. Properties of the System.Windows.Media.GradientBrush Class
Property
ColorInterpolationMode
Type
ColorInterpolationMode
Description
Specifies the color space to use when interpolating colors. Set it to ScRgbLinearInterpolation to use the scRGB space (visit http://en.wikipedia.org/wiki/ScRGB for more details) or SRgbLinearInterpolation to use the sRGB space (visit http://en.wikipedia.org/wiki/SRGB for more details). The collection of gradient stops defining how colors are spread in the surface being filled. Gets or sets the coordinate system used by the brush. Set this to Absolute for coordinates to be interpreted in local space, and set it to RelativeToBoundingBox to use coordinates relative to the bounding box (0 corresponds to 0 percent of the box, and 1 corresponds to 100 percent, so 0.5 would be interpreted as the center point). The default value is RelativeToBoundingBox. It does not affect offset values of gradient brushes. Gets or sets how the gradient is spread. Valid values are Pad (the default), Reflect, and Repeat.
GradientStops
GradientStopCollection
MappingMode
BrushMappingMode
SpreadMethod
GradientSpreadMethod
CHAPTER 9 GRAPHICS
The LinearGradientBrush
A linear gradient brush spreads a color gradient across a straight line. This straight line can be any straight line through the surface being painted, and is described by the StartPoint and EndPoint properties of the LinearGradientBrush class. The top-left corner is (0,0) and the bottom-right corner is (1,1). Using 0 and 1 for the start point and endpoint of each coordinate plane allows you to use this brush without worrying about the actual size of the surface being painted. It is through this line that the gradient spreads by default, starting from the top left and ending at the bottom right. You can see this default behavior in the first column of Figure 9-19. If you specify only a single gradient stop, the linear gradient brush paints a solid color. If you use two gradient stops for example, starting at black (#FF000000) and ending in red (#FFFF0000) the gradient starts at black and the color spreads evenly from black to red along the length of the surface being painted, until the end of the surface is reached. Multiple gradient stops can be specified along a gradient line from 0.0 to 1.0 by using the Offset property of gradient stop.
Figure 9-19. Different configurations of the linear gradient brush Figure 9-19 shows the behavior of several different options for the linear gradient brush. The default behavior is shown first, spreading from black to white. Here s the XAML for this gradient: <Rectangle Stroke="Black" Width="60" Height="60"> <Rectangle.Fill> <LinearGradientBrush> <GradientStop Color="#FF000000" Offset="0.0"/> <GradientStop Color="#FFFFFFFF" Offset="1.0"/> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> The following code shows how to spread the gradient horizontally instead of diagonally: <Rectangle Stroke="Black" Width="60" Height="60"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5"> <GradientStop Color="#FF000000" Offset="0.0"/> <GradientStop Color="#FFFFFFFF" Offset="1.0"/> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> The next code block creates a gradient that spreads to the center point of the gradient line and a second gradient that spreads from the center point to fill up the other half of the surface:
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