Circle command at the commnd line

"John Chapple" <jrchapple@sympatico.ca> wrote in message

news:i03mbq$u47$1@cheetah.cadsoft.de...

>I am having a problem obtining a circle of a specified diameter with the

>circle command.  I am moving objects from one library to another by using

>scripts, and have keepouts over through hole pads to keep surface mount

>devices with IPC standard courtyards in the keepout layer a sufficient

>distance away.

>

The example given in the help files

>

circle (0 0) (1 0)

>

produces a circle of diameter 1 and centre the origin.

>

If, however, I move the center of the circle to, say (5 5) and execute the

command

>

circle (5 5) (1 0)

>

Eagle draws a circle of radius 6.403122 at (5 5) .

>

On further experimentation I discovered that the command

>

circle (x y) (r 0)

>

produces a circle with centre (x y) and radius (y^{2 + (x-r)}2)^0.5 .

>

I tested this on Eagle 4.16r2 with the same result.

>

What gives?

>

Cheers

John

Hi John,

The first point is the centre of the circle and the second is a point on the

circumference.

The comand to draw a circle of radius 1 at 5 5 is: circle (5 5) (6 5);

regards

Thanks very much, Greg.

Cheers

John

"Greg Erskine" <gerskine@tpg.com.au> wrote in message

news:i041p9$s09$1@cheetah.cadsoft.de...

"John Chapple" <jrchapple@sympatico.ca> wrote in message

news:i03mbq$u47$1@cheetah.cadsoft.de...

>>I am having a problem obtining a circle of a specified diameter with the

>>circle command.  I am moving objects from one library to another by using

>>scripts, and have keepouts over through hole pads to keep surface mount

>>devices with IPC standard courtyards in the keepout layer a sufficient

>>distance away.

>>

>> The example given in the help files

>>

>> circle (0 0) (1 0)

>>

>> produces a circle of diameter 1 and centre the origin.

>>

>> If, however, I move the center of the circle to, say (5 5) and execute

>> the command

>>

>> circle (5 5) (1 0)

>>

>> Eagle draws a circle of radius 6.403122 at (5 5) .

>>

>> On further experimentation I discovered that the command

>>

>> circle (x y) (r 0)

>>

>> produces a circle with centre (x y) and radius (y^{2 + (x-r)}2)^0.5 .

>>

>> I tested this on Eagle 4.16r2 with the same result.

>>

>> What gives?

>>

>> Cheers

>> John

>

Hi John,

>

The first point is the centre of the circle and the second is a point on

the circumference.

>

The comand to draw a circle of radius 1 at 5 5 is: circle (5 5) (6 5);

>

regards

>

>

John Chapple wrote on Fri, 25 June 2010 21:49

circle (0 0) (1 0)

 

produces a circle of diameter 1 and centre the origin.

It shouldn't.  The diameter should be 2, not 1.

Quote:

circle (5 5) (1 0)

 

Eagle draws a circle of radius 6.403122 at (5 5) .

Sounds right.  What's the problem?

Quote:

On further experimentation I discovered that ...

Here's a heretical thought, READ THE MANUAL instead of poking around in the

dark guessing what the command does.

Quote:

What gives?

Apparently your unwillingness to read the documentation.  If you had

bothered, you'd know that the two points you specify are the center and a

point on the circle.  So

CIRCLE (3 2) (4 2)

will produce a circle centered at 3,2 with a radius of 1.

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