Polygone along a line

[Angelos]

Do you think wpuld be possible drawing a polygon along a line?

[Eric Pousse]

Sorry Angelos, I don't understand what you mean.

Cordialement.

[Angelos]

Sorry.
I have a line, with a specific measure and angle. I want to drawing a polygone with one of its sides coincident with the line.
So click on the first point of the line, than on the final one and i’ve got my polygone.

[Eric Pousse]

Ha do you mean a regular polygon?!

[Angelos]

Yes

[Eric Pousse]

Bonjour Angelos,

There is not a tool to do that (nor in RealCADD).
But it is easy to calculate and draw this polygon.
With :
N : number of sides of the polygon you want
Lc : length of the base line (and of the sides of the polygon)

Begin to draw a perpendicular line from the base line in direction of the center of the polygon you want
Move this line to the center of the line
You have now simply to set the length of this perpendicular line to have the center of the polygon
This length is :
L = Lc / 2 / tan(360 / N / 2)

Voilà !
You can now draw the polygon from the point of the perpendicular which is the center of the polygon to one end of the base line.

Cordialement.

[Angelos]

Thank you very much

[Angelos]

But … i don’t obtain the result.

50 / 2 / tan (360 / 8 / 2) = 44,81

The regular polygon of 8 sides from the center to one side of base line has 39,27 as side

[Angelos]

Now it works perfectly with formula:

Lc : (2 * tan(180°: N))

Thank you

[Eric Pousse]

It is the same formula.