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CHAPTER 18 GRAPHICS IN WPF
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Combining Geometries
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There are two ways in which you can combine several Geometry objects: The GeometryGroup class can contain a collection of Geometry objects that are treated as a single object. You can use a GeometryGroup object wherever you can use a single Geometry object. The CombinedGeometry class takes two Geometry objects and combines them into a single Geometry object that has a different path than either of the two separate objects. There are four operations you can use to combine the objects Union, Intersection, Exclude, and Xor.
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Figure 18-37 shows an example of a GeometryGroup with two ellipses. The Data property of the Path class requires a reference to a single Geometry object, so we can t place two EllipseGeometry objects directly into the Data property. To solve that problem, you can place the ellipses inside a GeometryGroup and assign that to the Data property.
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Figure 18-37. A GeometryGroup is a collection of Geometry objects that can be used anywhere a single Geometry object can be used.
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CHAPTER 18 GRAPHICS IN WPF
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Unlike the GeometryGroup class, which is a just a collection of Geometry objects, the CombinedGeometry class combines parts of exactly two Geometry objects into a single object that is unlike either of the two original objects. Figure 18-38 shows the results of combining two overlapping ellipses, using the four available combining operations.
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Figure 18-38. The CombinedGeometry class allows you to combine two Geometry objects, yielding a new path different from either of the two initial Geometries. Figure 18-39 shows the important properties of the CombinedGeometry class. Notice that it takes exactly two Geometry objects and a mode for combining them.
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Figure 18-39. The CombinedGeometry class The following is the markup of the top-right screen in Figure 18-38: <Path Stroke="Black" StrokeThickness="2" Fill="LightGray"> <Path.Data> <CombinedGeometry GeometryCombineMode="Xor"> <CombinedGeometry.Geometry1> <EllipseGeometry Center="60,50" RadiusX="40" RadiusY="30"/> </CombinedGeometry.Geometry1> <CombinedGeometry.Geometry2> <EllipseGeometry Center="100,50" RadiusX="40" RadiusY="30"/> </CombinedGeometry.Geometry2> </CombinedGeometry> </Path.Data> </Path>
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CHAPTER 18 GRAPHICS IN WPF
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Path Markup Syntax
From the previous examples, you can see that the markup for the PathFigures in a PathGeometry object can be quite extensive, even to describe simple paths. To remedy this, WPF provides the path markup syntax, which allows you to significantly abbreviate the markup. To use the path markup syntax, you assign a string to the Figures property of the PathGeometry. The string contains shorthand for describing the path. The following are some important things to know about the path markup syntax: The syntax consists of single-letter commands followed by sets of numeric parameters. The meanings of the numeric parameters depend on the command. There are three types of commands. The move command: This command sets the start point of the figure. This command is either an uppercase M or lowercase m. The draw commands: There are a number of different draw commands, depending on the path to be drawn. The close command: This command is optional and is either an uppercase Z or a lowercase z.
The numeric parameters can be separated by either commas or whitespace. (Although the parser doesn t care, I find it significantly easier to read the X and Y coordinate pairs when they re separated by commas.)
For example, the following PathGeometry uses the path markup syntax to describe the first of the two paths from the previous example. Notice the following about the markup: The first command is an uppercase M. This is the move command, which, in this case, sets the starting point of the figure to position 10, 10. The fact that the command is uppercase means that the position is an absolute position. A lowercase m, by comparison, means relative to the previous position. The second command is the uppercase L. This is the line to command, which means that the series of coordinate positions following the command are points in the path. As with the M command, uppercase means that the points specify absolute positions, and lowercase means that each point is relative to the previous point.
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