Creating Shapes in .NET

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Creating Shapes
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Shape files are used for both shapes and fonts. You create them with a text editor and save them with the extension .shp. You then use the COMPILE command (by typing it on the command line), which opens the Select Shape or Font File dialog box, shown in Figure 32-1. Choose the .shp file and click Open. AutoCAD automatically compiles the file into a new file with the same name but with an extension of .shx, and displays a message on the command line that compilation succeeded.
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Figure 32-1: The Select Shape or Font File dialog box
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Using shape files
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Once you have a compiled shape file, you must load it, using the LOAD command, before you can place it in a drawing. AutoCAD opens the Select Shape File dialog box. Choose the .shx file and click Open. Font files do not have to be loaded because they are automatically referenced by text styles that use the font files. To insert a shape, use the SHAPE command prompts as follows: 1. Enter s or[ ]: Type the name of the shape or type to get a list of loaded shapes. 2. Specify insertion point: Pick a point on the screen. AutoCAD drags the shape as you move the cursor. 3. Specify height <1.0000>: This functions like a scale factor. For example, type .5 to insert the shape at one-half its original size. 4. Specify rotation angle <0>: Type a rotation angle.
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Creating shape files
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Shape files and font files are essentially the same. In this section I explain how to create shapes. At the end of the chapter I explain the few distinctions necessary to create a font file. As with all customizable files, use a text editor to create shape files. You can add comments following a semicolon.
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A shape definition has the following syntax:
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*shapenumber,#ofspecs,SHAPENAME spec1,spec2,...,0
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The definition must start with an asterisk. Each line cannot contain more than 128 characters. Table 32-1 explains the parts of this shape definition.
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Table 32-1 The Parts of a Shape Definition
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Item shapenumber #ofspecs SHAPENAME spec1... Explanation You can use any number from 1 to 255. Each shape in a file must have a unique number. This is the number of specifications in the second line of the definition, including the mandatory zero at the end. You must use uppercase for the shape name. This is the name you use with the SHAPE command. This is a code that defines the actual shape. Each specification code defines a part of the shape, such as a line segment or an arc. Together, all the specifications draw the shape. The definition must end with a zero. Aspx Crystal upc-a creationon vb
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Length and direction codes
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You can use two sets of codes to define a shape. The first set, the length and direction codes, only lets you draw straight line segments. You use this system to create specifications in the three-character hexadecimal format. The first character is 0, which tells AutoCAD that the next two characters are hexadecimal values. The second character is a length in units. The maximum is 15 units. The number values can range from 0 to 9. For values from 10 to 15, use A to F. However, the length is measured along the nearest X or Y distance. Therefore, diagonal lengths are not true lengths. The third character is a direction code. Figure 32-2 shows how this code works. Use the code that represents the desired direction of the line from the start point.
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2 1 0
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Figure 32-2: The direction codes
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Start point B C D
Here is the code for the shape shown in Figure 32-3:
*2,4,PENNANT 044,02F,029,0
Figure 32-3: The PENNANT shape
Here s how this shape works: 2 is the shape s unique number. 4 is the number of bytes (specifications) on the second line of the definition. PENNANT is the shape s name. 044 draws the pole, a line that is 4 units in the vertical direction. 02F draws the top line of the pennant, a line that is approximately 2 units in the F direction. (See note below.) 029 draws the bottom line of the pennant, a line that is approximately 2 units in the 9 direction. (See note below.)