Drawing Curves and Point Objects in .NET

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7 Drawing Curves and Point Objects
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Drawing Arcs
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An arc is a portion of a circle. Therefore, to define an arc, you not only have to define a circle for example, by specifying a center and a radius but also you must define the start and endpoints of the arc. You can do this in many ways. AutoCAD offers several methods of defining an arc. The method you pick depends on the information you have about the arc you want to draw.
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Understanding arc options
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Arcs have many options. Making sense of them may seem overwhelming, but once you understand the parts of an arc and AutoCAD s terminology, you can choose the options that suit your needs. Figure 7-3 shows the parts of an arc that you can use to draw an arc. Refer to these parts as you read through the arc options.
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Endpoint Radius Center
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Direction Length of chord Start point Included angle
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Figure 7-3: The parts of an arc
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Figure 7-4 shows the flow of the arc options. When you start the ARC command, you have two options, Start point and Center. Depending on which you choose, more options become available. You can also press Enter at the first arc prompt to draw a second arc starting from the endpoint of a previous arc, line, polyline, and so on. The new arc continues in the same direction as the end of the first arc. The only other prompt is the endpoint.
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Part II Drawing in Two Dimensions
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Angle Length of chord Endpoint Angle Direction Radius Center point
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Start point
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Second point
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Angle Length of chord Endpoint
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Figure 7-4: The ARC command options
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Drawing arcs
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To draw an arc, choose Arc from the Draw toolbar and follow the prompts. As with circles, object snaps are often helpful when drawing arcs. When drawing an arc using the Start, End, and Radius options, the three specifications actually define two possible arcs, one minor and one major. AutoCAD draws the minor arc by default, in the counterclockwise direction. (A minor arc is less than half a circle.) If you enter a negative number for the radius, AutoCAD draws the major arc (which is more than half a circle). The options requiring an angle also define two possible arcs, one drawn counterclockwise and one drawn clockwise. AutoCAD draws the counterclockwise arc by default. If you type a negative number for the angle, AutoCAD draws the arc clockwise.
On the CD-ROM
The drawing used in the following Step-by-Step exercise on drawing arcs, ab7-b.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.
Step-by-Step: Drawing Arcs
1. Open ab7-b.dwg from the CD-ROM. 2. Save the file as ab7-2.dwg in your AutoCAD Bible folder. ORTHO is on and units are set to Fractional. Choose Tools Drafting Settings (or right-click OSNAP on the status bar and choose Settings) and set running object snaps for intersection, center, and endpoint. Make sure OSNAP is on. In this exercise, you draw part of the sealing plate shown in Figure 7-5.
7 Drawing Curves and Point Objects
3. Start the LINE command. Start at 2,3 and use Direct Distance Entry to create a 7-unit horizontal line to the right. End the LINE command.
See 4 for a full explanation of how to use Direct Distance Entry.
4. Draw another line starting at 5-1/2,1-5/8 and draw it 2-3/4 units long in the 90degree direction. These two lines are center lines and would ordinarily appear in a different color and linetype than the object you are drawing.
You learn about colors and linetypes in 11.
5. Draw a circle with its center at the intersection of the two lines (use the Intersection object snap) and a radius of 11 16. 6. Use the Center object snap to draw another circle with the same center as the first circle and a radius of 1.
Figure 7-5: The dimensioned sealing plate for a valve
Thanks to Jerry Bottenfield of Clow Valve Company in Oskaloosa, Iowa, for this drawing.
7. Draw a third circle, using the From object snap (Shift+right-click to open the object snap menu). For the base point, use the Center object snap and pick either of the first two circles you drew. The offset is @-1-15/16,0 (this means 1-15/16 units to the left of the center of the first two circles). Its radius is 3 8.