Current ucs numeric angle (rads or degs)

[MartinSomerville]

Hello

 

How can I extract the numeric value for the current ucs angle. ie world xy plane angle = 0 but if rotated about z say 30 degrees then angle would be 30 (or pi/180*30 for rads)

 

I guess this mighh get complex with non vert z ucs.

 

Anyway, any help would be grand

 

thanks

martin

[Lee Mac]

Hi Martin,

 

  Quote

(or pi/180*30 for rads)

I'm sure it's only a typo, but I thought I'd point out that a conversion from degrees to radians is:

 

(x/180)*pi

 

and going radians to degrees:

 

(x/pi)*180

 

Just in case you get any erroneous results in the future.

[ASMI]

UCS rotation defines with X and Y vectors in 3D space. Look for UCSXDIR and UCSYDIR system variables.

[lpseifert]

You could try this, it should work when the UCS is rotated around Z;

probably a better way to do it using UCSXDIR, UCSYDIR as suggested by ASMI, but I guess I was bored...

(defun c:test (/ p1w p2w ang)
 (defun rtd (a) (/ (* a 180.0) pi))
 (setq p1w (trans '(0 0 0) 1 0)
   p2w (trans '(10 0 0) 1 0)
   ang (rtd (angle p1w p2w))
   )
 (prompt (strcat "\nThe UCS is rotated " (rtos ang 2 4) " degrees from the WCS"))
 (princ)
 )

[MartinSomerville]

thankyou both for your reply.

 

any help is welcome.

 

Now I should be able to nut out, using this info, how to set a text to zero or 90 angle (relative to ucs) with a click (using (50 . x) ).

 

 

 

cheers

martin

[MartinSomerville]

ooh

 

we posted at the same time. thanks. will check it out

[ABuckingham]

  Lee Mac said:

I'm sure it's only a typo, but I thought I'd point out that a conversion from degrees to radians is:

 

(x/180)*pi

 

Actually it's just normal order of operations not a typo. Division and multiplication are carried out with the same priority so pi/180*x is exactly the same as the formula you provided. Brackets certainly make things easier to read however.

[Lee Mac]

  Quote

Actually it's just normal order of operations not a typo. Division and multiplication are carried out with the same priority so pi/180*x is exactly the same as the formula you provided.

 

I'm afraid that I do not agree... there is no way that you would multiply the input angle by 180 to convert to radians. I understand your point that multiplication/division are treated as the same priority, but this makes no difference if the variables being dealt with are placed incorrectly.

[ABuckingham]

  Lee Mac said:

I'm afraid that I do not agree... there is no way that you would multiply the input angle by 180 to convert to radians. I understand your point that multiplication/division are treated as the same priority, but this makes no difference if the variables being dealt with are placed incorrectly.

 

As written pi/180*x then the value of x is not being multiplied by 180, it's being multiplied by pi/180 which is correct. Normally expressions are written with constants on the left and variables on the right here. Perhaps it's common practice to work expressions from right to left in the UK? In the US evaluation is done from the left to the right so it's possible it's a cultural difference.

[Lee Mac]

I read the initial post as:

 

pi/(180*x) 

 

and not:

(pi/180)*x 

 

which is probably why I disagreed with your proposal, but I understand now the point you are making.

[ABuckingham]

  Lee Mac said:

which is probably why I disagreed with your proposal, but I understand now the point you are making.

 

And I can certainly see how bracketing clarifies the situation, I tend to use them liberally myself to clarify equations in text forums like this one just to prevent confusion. In a perfect world we'd all be using polish notation.