Figure 16-13: The topological site map with a gravel road created using the SPLINE command in .NET

Create UPC-A in .NET Figure 16-13: The topological site map with a gravel road created using the SPLINE command
Figure 16-13: The topological site map with a gravel road created using the SPLINE command
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6. Type x twice, and then press Enter to end the SPLINEDIT command. 7. Save your drawing.
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16 Drawing Complex Objects
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Creating Regions
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Regions are two-dimensional surfaces. They look like closed polylines, but AutoCAD can calculate more information from regions than from polylines, such as the centroid, moments of inertia, and other properties relating to mass. You can also create complex shapes by combining, subtracting, and intersecting regions. While these commands are most often used for 3D drawing, they are often used in 2D drawing as a preparation for 3D drawing. You create a region from other objects. You can use closed polylines, closed splines, circles, ellipses, and combinations of lines, arcs, and elliptical arcs that create a closed shape. The shape cannot intersect itself like a figure 8. Figure 16-14 shows a complex region. Although it looks like a circle with seven circles inside it, it is actually a circular surface with seven holes in it. When you select it, you can see that it is one object. The real proof of the pudding is when you try to extrude it to create a 3D object out of it. You can then view it at an angle, hide background lines, and clearly see the holes, as shown in Figure 16-15. To create a region, choose Region from the Draw toolbar. AutoCAD asks you to select objects. Select all the objects and press Enter to end object selection. If all the objects create a closed, nonintersecting shape, AutoCAD tells you:
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1 loop extracted. 1 Region created.
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Figure 16-14: A complex region
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Figure 16-15: A region can be used to create a complex 3D object.
Part II Drawing in Two Dimensions
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The original objects are deleted. If your objects aren t perfectly end to end, AutoCAD merely states:
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0 loops extracted. 0 Regions created.
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Note
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If you want to keep the original objects, change the DELOBJ system variable to 0 (off) before you use the REGION command.
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In order to draw your original objects end to end, remember to use Endpoint object snaps. Also, don t forget that you can start a line or arc at the end of the last point drawn by pressing Enter at the first prompt. You can also use TRIM and EXTEND to clean up extraneous endpoints. The BOUNDARY command (see the next section) offers a way to create regions in situations where objects are not neatly drawn end to end. If you had a hatch inside the objects, you lose hatch associativity. You can rehatch the region if you wish. When you create a region that is hatched, AutoCAD has no problem creating the region but doesn t quite know what to say about the hatch. Here s the response:
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1 closed, degenerate or unsupported object rejected.
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As mentioned earlier, you can combine, subtract, and intersect regions to create complex objects. The three commands to accomplish these functions are UNION, SUBTRACT, and INTERSECT. These commands are discussed in 24 because they are most often used in 3D drafting.
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The drawing used in the following Step-by-Step exercise on creating regions, ab16-d.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.
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Step-by-Step: Creating Regions
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1. Open ab16-d.dwg from your CD-ROM. 2. Save the file as ab16-5.dwg in your AutoCAD Bible folder. 3. Choose Region from the Draw toolbar. At the Select Objects: prompt, use a selection window to select the entire model, shown in Figure 16-16. Press Enter to end object selection. AutoCAD responds with this message:
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7 loops extracted. 7 Regions created.
Note
You might experience a slight delay when first using the REGION command while AutoCAD loads the 3D modeling feature.
16 Drawing Complex Objects
Figure 16-16: The outer profile and the six circles can all be turned into regions. The circles could then be subtracted from the outer profile to create a surface with six holes.
Creating Boundaries
The BOUNDARY command creates either polylines or regions from an enclosed area. This command has the capability of analyzing an area and ignoring intersecting lines that give the REGION command so much trouble. However, no spaces between objects are allowed. You may remember that in 12, I mentioned that you can use the BOUNDARY command to calculate the area of a closed space. Use the BOUNDARY command whenever you need to create a closed complex area. To create a boundary, choose Draw Boundary to open the Boundary Creation dialog box, as shown in Figure 16-17. This dialog box is related to the Boundary Hatch dialog box, covered later in this chapter. Most of the items in the dialog box are not active unless you are creating a hatch.