Eagle snafu,CIRCLE command

Did not see it.

• NO!! Impossible.

• Something is corrupted in Eagle; whatever i attempt to draw is invisible. I cannot take your word for that due to the massive difference between the TWO circles described (same center but different crossings of circumference).

do the math CIRCLE (X Y) (X+radius Y)

GRID inch 1; CIRCLE (0 0) (1 0); CIRCLE (1 0) (2 0); CIRCLE (3 3) (4 3);

three two inch circles at 0,0 1,0 3,3

-Lasse

Well, do you actually mean "having a circumference the same as one of the other two examples" or do you mean having an XY POINT ON THE CIRCUMFERENCE the same as one of the other two examples? Do you see the difference in the two phrases? A circle's circumference is one number. A coordinate on the circle's circumference is a pair of numbers. Lasse gave 3 examples but the first is at 0,0. And he did not specify that it was the RADIUS. Nevertheless it should serve as a good example.

Tell you what, give me your circle's center and desired radius and I will give your the coordinates you need to draw it.

Thanks, Lasse.

John

Elaborating on Lasse's approach, let (x,y) be the circle's center. Let R be the circle's radius. There are an infinite number of ways to draw your desired circle, but the 4 easiest are shown below:

(x,y) (x+R,y) (x,y) (x-R,y) (x,y) (x,y+R) (x,y) (x,y-R)

These all define the same circle.

My mistake, Robert. I should have said (0 0) and (1 0) describe the same circle. And yet that is not exact. There is a small difference in the diameter which I did not want to bring up at the time because I just wanted to tell you how to do this in Eagle.

My mistake may have caused confusion for both of us. One of the problems (which I had hoped to avoid) is that your example is so very close that, unless you are very careful, they look identical.

Cheers, John

"none having 0,0 for center"

I did. If you do not have the decency to respond, then I will never try to help you again.

Cheers.

Help?? I gave two DIFFERENT circles, same centers, one thru 0,0 and another thru 0,1 and you blew me off. It takes THREE points to define a circle,so no mater how one "interprets" the so-called help, one cannot figure how to construct a particular "wiggle".

a circle only takes to points, one center and one on the circumference

-Lasse

If the only information you have is the points, it takes three. But yes, two, plus knowing which one is the center will also define a circle.

No, I tried to help.

I did not know that there was a "wiggle" in a circle. In Eagle it does not take three points. Do you not understand my email which told you how to make a circle? Do you have problems reading the group? Do you have a comprehension problem? I will repeat my post here:

"Elaborating on Lasse's approach, let (x,y) be the circle's center. Let R be the circle's radius. There are an infinite number of ways to draw your desired circle, but the 4 easiest are shown below:

(x,y) (x+R,y) (x,y) (x-R,y) (x,y) (x,y+R) (x,y) (x,y-R)

These all define the same circle."

I have seen that you have some arithmetic abilities. Will these relations help? If not, please ask and I will try to explain.

John S

THANKS! That clarity does help!

OK; accepted.

I do not understand your response. OK what? Accepted what? Are we done with this?