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Printer QR in Visual Basic .NET s PROGRAMMING SILVERLIGHT WITH XAML AND JAVASCRIPT

CHAPTER 16 s PROGRAMMING SILVERLIGHT WITH XAML AND JAVASCRIPT
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The RadialGradientBrush
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This is similar to the LinearGradientBrush in that is paints a space using a gradient, but it does it in a circular manner, with 0 marking the center of the circle and 1 being its radius. Thus, if you have two colors defined, it will look a lot like the effect of a spotlight of the first color being shown on a wall of the second color, whereby the center of the circle will be the color of the light, the outer edge of the circle will be the color of the wall, and a gradient between the two will fill the space. When using the RadialGradientBrush, you don t need to specify a start point or endpoint, as the gradient direction will always be from the center of the circle to its outside edge. Gradient stops are used in the same manner as the LinearGradientBrush, with the Offset indicating the unit distance from the center. Here s an example of a RadialGradientBrush using the same rainbow colors as the previous rectangle:
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<Canvas xmlns="http://schemas.microsoft.com/client/2007" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="640" Height="480" Background="White" x:Name="Page"> <Rectangle Width="211" Height="176" Stroke="#FF000000" Canvas.Left="8" Canvas.Top="64"> <Rectangle.Fill> <RadialGradientBrush> <GradientStop Color="Red" Offset="0"/> <GradientStop Color="Orange" Offset="0.17"/> <GradientStop Color="Yellow" Offset="0.34"/> <GradientStop Color="Green" Offset="0.51"/> <GradientStop Color="Blue" Offset="0.68"/> <GradientStop Color="Indigo" Offset="0.85"/> <GradientStop Color="Violet" Offset="1"/> </RadialGradientBrush> </Rectangle.Fill> </Rectangle> </Canvas>
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The RadialGradientBrush gives you some extra control over how the gradient is painted. The GradientOrigin allows you to set the point at which the gradient emanates. It doesn t have to be the center of the circle, so setting it to a different value will stretch the gradient from the center of the circle to the specified point. You set it using a normalized (x,y) value, where (0.5,0.5) is the center of the circle, (1,1) is the lower right-hand side
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CHAPTER 16 s PROGRAMMING SILVERLIGHT WITH XAML AND JAVASCRIPT
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of the rectangle bounding the circle, and (0,0) is the upper left-hand side of the rectangle bounding the circle. Here s an example of the GradientOrigin being set to (0.2,0.2):
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<Rectangle Width="200" Height="128" Canvas.Left="8" Canvas.Top="8"> <Rectangle.Fill> <RadialGradientBrush GradientOrigin="0.2, 0.2"> <GradientStop Color="#FF000000" Offset="0"/> <GradientStop Color="#FFFFFFFF" Offset="1"/> </RadialGradientBrush> </Rectangle.Fill> </Rectangle>
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The SpreadMethod allows you to determine how the gradient repeats. It can be set to one of three values: Pad is the default, and it means that the gradient fades evenly between colors, and that the bounding rectangle is filled with the last color on the gradient; Reflect means that once the gradient is filled, it is reversed to fill in the remainder; and Repeat means that once the gradient is filled, it is repeated. These are particularly useful when used in combination with the RadiusX and RadiusY properties. Here s an example of a RadialGradientBrush using the Reflect value in the SpreadMethod:
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<Rectangle Width="200" Height="128" Canvas.Left="8" Canvas.Top="8"> <Rectangle.Fill> <RadialGradientBrush SpreadMethod="Reflect"> <GradientStop Color="white" Offset="0"/> <GradientStop Color="gray" Offset="0.5"/> <GradientStop Color="black" Offset="1"/> </RadialGradientBrush> </Rectangle.Fill> </Rectangle> RadiusX and RadiusY are used to set the desired radius of the gradient. The default value of this is 0.5, so specifying a value less than this will mean that multiple gradients will be used in the fill. This is probably best shown by example: <Rectangle Width="200" Height="128" Canvas.Left="8" Canvas.Top="8"> <Rectangle.Fill> <RadialGradientBrush RadiusX="0.1" RadiusY="0.1" SpreadMethod="Reflect"> <GradientStop Color="#FF000000" Offset="0"/> <GradientStop Color="#FFFFFFFF" Offset="1"/> </RadialGradientBrush> </Rectangle.Fill> </Rectangle>
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CHAPTER 16 s PROGRAMMING SILVERLIGHT WITH XAML AND JAVASCRIPT
You can see the result of this in Figure 16-3. As the radius is set to 0.1 on both x and y, five circles are used to paint the gradient; and as the SpreadMethod is set to Reflect, the gradient goes from black to white, and then white to black, and then black to white, and so on.
Figure 16-3. Using the RadiusX, RadiusY, and SpreadMethod attributes
The ImageBrush
In addition to filling a space with colors or gradients, you can also fill one with pictures using the ImageBrush. It offers a number of attributes that can be used to set the behavior, in particular how you control the image s aspect ratio and tiling behavior. Here s an example of XAML to define filling a rectangle with an image using the ImageBrush:
<Rectangle Width="200" Height="128"> <Rectangle.Fill> <ImageBrush ImageSource="apress.jpg" /> </Rectangle.Fill> </Rectangle>
You determine how the image is stretched using the Stretch attribute. This can take several different stretch modes:
None: Renders the image without changing it in any way. Uniform: Scales the image to fit the dimensions of the fill area without changing the aspect ratio.
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