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Topic: How to offset circle?
Replies: 3   Last Post: Jun 15, 1996 11:36 PM

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Russell W. Patterson

Posts: 1
Registered: 12/12/04
How to offset circle?
Posted: Jun 13, 1996 10:04 AM
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I want to plot the equation of a circle only with an
offset along a line through the origin.

I know that r=5sin(t) t=theta
will plot a circle of radius 5 centered on the positive
y axis at 2.5.

I also know that if I include a term in the argument of
the sin term I can swing the circle through 360 degrees
hinged at the origin (r=5sin(t-ang)).

What I want to do is to slide the circle along a line
drawn through the origin such that the center of the
circle is located on this line instead of at 0,0.
I want to draw the line at some arbitrary angle and be
able to slide my circle up and down the line.

I need an equation (I am using Graphmatica). Pointers?

If I have been unclear on what I need I will be glad to
fax or e-mail individuals a sketch.


Russell W. Patterson
System Protection & Analysis
Tennessee Valley Authority
work e-mail:

Mississippi State University
Graduate School of Electrical Engineering
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Home (Whitwell, TN)
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