Let us start with Circle
You can create circles in several ways. The default method is to specify the center and the radius. Three other ways to draw a circle are shown in the illustration.
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Draw a Circle Tangent to Other Objects
The tangent point is a point where an object touches another object without intersecting it. To create a circle that is tangent to other objects, select the objects and then specify the radius of the circle. In the illustrations below, the bold circle is the one being drawn, and points 1 and 2 select the objects to which it is tangent.
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Ellipse
If you are drawing on isometric planes, use an ellipse to represent a circle viewed from an oblique angle. The easiest way to draw an ellipse with the correct shape is to use the Isocircle option of ELLIPSE. The Isocircle option is available only when the Style option of Snap mode is set to Isometric (see DSETTINGS).
Note - to represent concentric circles, draw another ellipse with the same center rather than offsetting the original ellipse. Offsetting produces an oval-shaped spline that does not represent foreshortened distances as you would expect.
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The illustrations below show two different ellipses created by specifying axis and distance. The third point specifies only a distance and does not necessarily designate the axis endpoint.
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Donut
Donuts are filled rings or solid-filled circles that actually are closed polylines with width.
To create a donut, you specify its inside and outside diameters and its center. You can continue creating multiple copies with the same diameter by specifying different center points. To create solid-filled circles, specify an inside diameter of 0.
To create a donut, you specify its inside and outside diameters and its center. You can continue creating multiple copies with the same diameter by specifying different center points. To create solid-filled circles, specify an inside diameter of 0.
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Command line: donut
Specify inside diameter of donut
If you specify an inside diameter of 0, the donut is a filled circle.
Specify outside diameter of donut
Specify center of donut or
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Whatever curvilinear shapes you would not be able to draw with above commands would be possible with Spline. We will explore it tomorrow, stay tuned…!
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