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CHAPTER 18 GRAPHICS IN WPF
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For example, the following markup specifies a LinearGradientBrush that paints the Background of a Button. The LinearGradientBrush has five GradientStops, including the start point and the end point. <StackPanel> <Button Height="200" Width="230" Margin="10"> <Button.Background> <LinearGradientBrush StartPoint="0,0" EndPoint="1,1"> <GradientStop Offset="0" Color="Red"/> <GradientStop Offset=".25" Color="Orange"/> <GradientStop Offset=".5" Color="Green"/> <GradientStop Offset=".75" Color="Blue"/> <GradientStop Offset="1" Color="Violet"/> </LinearGradientBrush> </Button.Background> </Button> <TextBlock HorizontalAlignment="Center" FontWeight="Bold"> (0, 0) (1, 1)</TextBlock> </StackPanel> Figure 18-22 shows the window produced by this markup. Although it s difficult to see in black and white, the colors progress from red at the top-left corner to orange at the 0.25 offset along the vector, all the way to violet at the bottom-right corner.
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Figure 18-22. A LinearGradientBrush with five GradientStops, going from red to violet and passing through orange, green, and blue
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CHAPTER 18 GRAPHICS IN WPF
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In the examples so far, we ve been using vectors that go from one corner to the other, or on the edges. But what if we specified the StartPoint and EndPoint at positions in the interior If you look back at Figure 18-21, the graphic on the right shows the vector of a LinearGradientBrush that goes from (0.25, 0.25) to (0.75, 0.75). Notice that the top-left corner and the bottom-right corner are not included in the span of the vector. How should WPF render these areas You can specify how to render these areas by setting the LinearGradientBrush s SpreadMethod property. The enumeration for this property has three possible values. Pad: This value specifies that the area before the StartPoint should be painted with the color used at the StartPoint and that the area after the EndPoint should be painted with the color set at the EndPoint. Reflect: This value specifies that the area before the StartPoint should be painted as a reflection of the colors along the vector. That is, the colors are in the opposite order, starting at the StartPoint and going in the opposite direction of the brush s vector. The same is true at the EndPoint, where the area beyond the Endpoint is a reflection of the end of the vector. Repeat: This value specifies that the coloring of the vector repeats after the EndPoint and before the StartPoint. That is, it is just a repeating pattern of colors gradients.
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Figure 18-23 shows three versions of a LinearGradientBrush that are identical except for the values of their SpreadMethod properties.
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Figure 18-23. The SpreadMethod property of a LinearGradientBrush specifies the appearance before the StartPoint and after the EndPoint.
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CHAPTER 18 GRAPHICS IN WPF
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WPF provides six shape elements you can use into your UI. The following are some important things to know about the shapes: There are five simple shape classes and a shape class called Path, which allows you to define arbitrary shapes. The shape classes are derived from the abstract Shape class, which contains the properties for setting the line stroke and the fill of the shape. The shapes are elements and can therefore be placed directly into your UI. Figure 18-24 illustrates some of the important properties of the six Shape classes.
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Figure 18-24. WPF provides five simple shapes and a complex Path shape. Figure 18-25 shows examples of the five simple shapes.
Figure 18-25. Examples of the five simple shapes
CHAPTER 18 GRAPHICS IN WPF
The following markup produces the shapes in the window shown in Figure 18-25: <StackPanel Orientation="Vertical" HorizontalAlignment="Center"> <Rectangle Stroke="Black" StrokeThickness="2" Margin="10" Height="30" Width="40" Fill="AliceBlue"/> <Ellipse <Line <Polyline <Polygon </StackPanel> The remaining shape class is the Path class, which allows you to produce arbitrary twodimensional shapes. You do this by creating an object derived from the Geometry class and assigning it to the Data property of the shape object. I ll explain the Geometry-derived classes in the next section. Figure 18-26 illustrates the six shape types. Stroke="Black" StrokeThickness="2" Margin="10" Height="30" Width="40" Fill="AliceBlue"/> Stroke="Black" StrokeThickness="2" Margin="10" X1="0" Y1="0" X2="40" Y2="30"/> Stroke="Black" StrokeThickness="2" Margin="10" Points="0,0 30,0 10,30 40,30"/> Stroke="Black" StrokeThickness="2" Margin="10" Points="0,0 30,0 10,30 40,30"/>
Figure 18-26. The Path shape draws whatever shape is defined by the Geometry object assigned to its Data property.
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