Brushes in Visual Studio .NET

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Brushes
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Brushes are used to paint the internal area contained by a surrounding stroke or the stroke itself For instance, a brush can be used to paint the interior space of a rectangle In fact, in the rectangles example shown in Figure 4-3, a gradient brush is used to paint the interior of the rectangle Brushes can be used to paint solid colors, gradients, images, and even video The ability to paint with images is fairly common among graphic design tools; however, the ability to paint with video is only available in a very few elite graphic design tools Expression Blend currently supports the display of image and video brushes in
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4: Animating Silverlight
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design mode for WPF applications but not for Silverlight applications However, it s fairly easy to create an image brush fill, as shown in the following markup snippet:
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<Ellipse Width="184" Height="184" Stroke="#FFD89623" StrokeThickness="3" CanvasLeft="8" CanvasTop="8"> <EllipseFill> <ImageBrush ImageSource="gingerbreadjpg" /> </EllipseFill> </Ellipse>
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The filled ellipse resulting from the preceding XAML is shown in Figure 4-5 Video can be used as a brush source in the same manner that images can be used, although a little more XAML is involved in painting with video First, a VideoBrush does not directly play video but rather utilizes video from another source, such as a
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Figure 4-5
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An image brush used to fill an ellipse
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Microsoft Silverlight 3: A Beginner s Guide
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MediaElement object In the following example, video is being played as the foreground of text The TextBlockForeGround utilizes a VideoBrush that, in turn, utilizes video from a MediaElement object
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<MediaElement Source="axe_murdererwmv" Opacity="0" x:Name="myMovie" /> <TextBlock Margin="45,81,40,126" TextWrapping="Wrap" FontSize="72" FontWeight="Bold" Text="Silverlight"> <TextBlockForeground> <VideoBrush SourceName="myMovie" /> </TextBlockForeground> </TextBlock>
The resultant TextBlock is shown in Figure 4-6 as filled with video using the preceding XAML
Figure 4-6
Using a video brush in Silverlight
4: Animating Silverlight
Transformations
Transformation objects are used to transform other Shape objects There are various types of transformations, including rotations, scales, skews, and translations A scale is a resize A skew transformation skews the shape of the Shape object A translation moves a shape The following markup snippet illustrates applying a 45-degree rotation to a TextBlock:
<TextBlock RenderTransformOrigin="05,05" Width="320" Height="80" CanvasLeft="80" CanvasTop="104" TextWrapping="Wrap"> <TextBlockRenderTransform> <TransformGroup> <ScaleTransform ScaleX="1" ScaleY="1"/> <SkewTransform AngleX="0" AngleY="0"/> <RotateTransform Angle="45"/> <TranslateTransform X="0" Y="0"/> </TransformGroup> </TextBlockRenderTransform> <Run FontFamily="Segoe UI" FontSize="48" Text="McGraw Hill"/> </TextBlock>
Figure 4-7 illustrates the result of the preceding XAML
Perspective Transformations
As mentioned, Silverlight is currently not able to deliver a true 3-D rendering engine due to the lack of coupling with local client hardware Silverlight developers have been asking Microsoft for a 3-D engine of some type since version 10 was in beta Silverlight 3 introduces a new feature called perspective transformations A perspective transformation is not a true 3-D engine but accommodates transforming the perspective of a graphic element along the X-axis, the Y-axis, and the Z-axis, resulting in a 3-D visual effect Perspective transformations can be implemented using code but can also be easily implemented using XAML A perspective transformation can be easily illustrated by starting with a simple image The following XAML is used to display the image shown in Figure 4-8:
<UserControl x:Class="L0408MainPage" xmlns="http://schemasmicrosoftcom/winfx/2006/xaml/presentation"
Microsoft Silverlight 3: A Beginner s Guide
Figure 4-7
A TextBlock with a transformation applied to it
xmlns:x="http://schemasmicrosoftcom/winfx/2006/xaml" Width="400" Height="300"> <Grid x:Name="LayoutRoot" Background="White"> <Image Source="gingerbreadjpg" Height="200"> </Image> </Grid> </UserControl>
Figure 4-8
A simple image
4: Animating Silverlight
The XAML UIElement element includes a new sub-element named Projection that is used to define a perspective transformation The Projection element contains an element named PlaneProjection The PlaneProjection element contains several attributes that are used to rotate a graphic element along the X-axis, Y-axis, and Z-axis For example, to rotate the image along the X-axis, assign a value to the RotationX attribute, as shown in the following markup snippet and in Figure 4-9:
<Image Source="gingerbreadjpg" Height="200"> <ImageProjection> <PlaneProjection RotationX="45" /> </ImageProjection> </Image>
Rotation angles may be combined so that a graphic element is rotated along multiple axes simultaneously, as shown in the following markup snippet and illustrated in Figure 4-10:
<Image Source="gingerbreadjpg" Height="200"> <ImageProjection> <PlaneProjection RotationX="45" RotationY="25" /> </ImageProjection> </Image>
Perspective transformation rotation angles may also be bound to the property values of other elements and may be configured using a storyboard and animation Additionally, the PlaneProjection element includes attributes to configure the center of rotation, the local offset, and the global offset
Figure 4-9
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