Circles: Tangent, Tangent, Radius?

Would it be possible to have these commands added to GH as they are in Rhino?

Also, drawing a circle from 3 Tangents is a very useful tool that i use quite frequently... I could well be missing an obvious work-around here, apologies if i am!

I'm trying to create this 'kidney-bean' shape in GH using the radius of 2 circles to control the shape with the option of being able to adjust the radius of each circle. I want to link the circles with tangent arcs that have a fixed radius, which adjusts its tangency with any change in radius of either circle:

The TArc command works for a smaller tangent arc, but wont 'flip' to allow a larger arc as shown grayed-out. It becomes a straight tangent line:

Appreciate any tips.

Thanks,

David.

Replies to This Discussion

Permalink Reply by Danny Boyes on September 6, 2011 at 3:42am

This came up on here very recently, so I cannot take credit for this solution, but I also can't remember who posted it.

Permalink Reply by David Wood on September 6, 2011 at 4:40am

Thanks Danny,

I'll take a look at that...

Cheers.

Permalink Reply by David Wood on September 6, 2011 at 8:47am

It is a very tidy solution...

...but only appears to work when both radii are the same...

Some more head-scratching to do in that case...

Permalink Reply by Caglar on September 6, 2011 at 9:16am

Hi David,

The previous thread is here:

http://www.grasshopper3d.com/forum/topics/creating-a-circle-with-2-...

I slightly updated the definition so that it works when two circles are not alike.

Attachments:

circles.gh, 4 KB

Permalink Reply by David Wood on September 6, 2011 at 9:35am

That's great Caglar! That is so simple, its brilliant!

It is a shame that the TArc command can't take a negative value to produce an arc that bulges outward in the way that your definition does. I wonder why that is...?

Thanks again,

David.

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