Diameter instead of radius

ipsketchpi · 24 Apr 2012, 09:11

Hi

There are no silly questions:)

These tease me all the time. When I draw circle with standard SU circle tool I must write radius, but I would like to write in diameter. Is it possible?

TIG · 24 Apr 2012, 09:28

No, but the radius is always half the diameter
However there are 'alternative' ways to draw circles [and arcs etc] - see 2dTools - here you get the circle-through-3-points, circle-by-center-radius and circle-by-start-diameter etc

pilou · 24 Apr 2012, 10:10

Take a look to this post

Gaieus · 24 Apr 2012, 10:51

@tig said:

No, but the radius is always half the diameter

So you can always enter diameter/2 into the Measurement box...

@unknownuser said:

Take a look to this post

Therefore no need for any plugin at all...

ArCAD-UK · 24 Apr 2012, 11:43

@gaieus said:

So you can always enter diameter/2 into the Measurement box...
Therefore no need for any plugin at all...

Thought I was having a Doh moment but this only seems to work with the division operator. I was beginning to think we had a discrete calculator available

Gaieus · 24 Apr 2012, 12:28

Yes, Pilou, but that was not the question on one hand and again, we are in the Newbie forum on the other so let's keep it simple at the beginning...

pilou · 24 Apr 2012, 12:34

@unknownuser said:

Therefore no need for any plugin at all

Yes but how you draw a circle between 2 objects ? (in the easy case horizontal or vertical)
You must first draw a line for have the middle of them and then the center!

And the best will be a plug for that!
Because even the Circle by Diameter don't work in this case!
Just 2 points to click

else you must without plug make some tricky align views/ axes etc...
The more easy seams to draw a line between the corners, then a rectangle
then the circle
Then kill line, rectangle

pilou · 24 Apr 2012, 12:35

What's no more simple to draw a circle ?
It's like that i have understood the question of the first post!

Jean Lemire · 24 Apr 2012, 13:22

Hi Pilou, hi folks.

There is an infinite number of circles between two points since there is an infinite number of planes around a line (the diameter).

Just ideas.

pilou · 24 Apr 2012, 14:14

In the case of the inclined circle above

@unknownuser said:

an infinite number of planes around a line

But only one with a diameter // to the ground ! (i believe that will be a tricky plug
(in fact 2 if your circle has a color different recto verso

ipsketchpi · 25 Apr 2012, 14:15

Cool, I like that 100/2 option. Exactly what I am looking for when I am too lazy to divide D to get R

Thanks!

namuh1 · 13 Sept 2012, 16:59

Silly question: Why does Layout let you set a circle by diameter... namely typing for exampe: 5" d in the toolbar to get a 5" diameter circle and Sketchup itself does not?

Dave R · 13 Sept 2012, 17:06

@namuh1 said:

Silly question: Why does Layout let you set a circle by diameter... namely typing for exampe: 5" d in the toolbar to get a 5" diameter circle and Sketchup itself does not?

Two different programs.

Gaieus · 13 Sept 2012, 18:26

It does allow - with a bit of basic calculation input - except when you also want to use the unit (it seems). I use a (centi)metric template and I can enter (say) 100/2 and it will draw a circle with an 50cm radius (i.e. 100cm dia).

I guess this does not help much with architectural imperial template for instance...

chmedly · 12 Dec 2013, 04:17

I too would like this. It takes too much time to switch to a separate calculator to figure out a complex circle's radius. I thought the /2 idea would work but it doesn't I have a Sketchup model that is set to decimal inches. I keep trying to draw a circle with a 1.25" diameter. If I type 1.25/2 in the box I get a circle with a radius of 1.25. I've tried a number of different ways of typing this to no avail.

Futurepast · 13 Dec 2013, 14:22

I use the scale tool. I draw the circle, use the scale tool by clicking on corner holding cntl key. Start the move and type in 2 or .5 to double or halve the circle

Dave R · 13 Dec 2013, 14:28

I've just practiced doing the math in my head. I must say I've gotten faster at it with practice. It really isn't a big problem for me.

I would find scaling a circle after I've drawn it kind of a pain especially if it is drawn on something else in a location where the larger circle would have to cross other geometry.

mm0063 · 20 Sept 2016, 14:23

@chmedly said:

If I type 1.25/2 in the box I get a circle with a radius of 1.25. I've tried a number of different ways of typing this to no avail.

So try 125/200 instead of 1.25/2 .
See https://www.youtube.com/watch?v=crY8SVypzMQ

slbaumgartner · 21 Sept 2016, 14:22

The technique of entering n/m works only because SketchUp's measurements box accepts fractions, not because it implements a divide operator as such. In a fraction both n and m must be integers. Any other type does not get treated as a numerator or denominator of a fraction.