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Drawing polygons in python turtle

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  Drawing polygons in python turtle geniusrko@gmail.com - 2014-02-10 15:44 -0800
    Re:Drawing polygons in python turtle Dave Angel <davea@davea.name> - 2014-02-10 19:00 -0500
    Re: Drawing polygons in python turtle Asaf Las <roegltd@gmail.com> - 2014-02-10 16:23 -0800
      Re: Drawing polygons in python turtle Asaf Las <roegltd@gmail.com> - 2014-02-10 16:34 -0800
        Re: Drawing polygons in python turtle geniusrko@gmail.com - 2014-02-10 18:13 -0800
          Re: Drawing polygons in python turtle Asaf Las <roegltd@gmail.com> - 2014-02-10 18:49 -0800
            Re: Drawing polygons in python turtle geniusrko@gmail.com - 2014-02-10 18:51 -0800
              Re: Drawing polygons in python turtle Asaf Las <roegltd@gmail.com> - 2014-02-10 18:59 -0800
                Re: Drawing polygons in python turtle geniusrko@gmail.com - 2014-02-10 19:01 -0800
                  Re: Drawing polygons in python turtle Asaf Las <roegltd@gmail.com> - 2014-02-10 19:03 -0800
                    Re: Drawing polygons in python turtle geniusrko@gmail.com - 2014-02-10 19:06 -0800
                      Re: Drawing polygons in python turtle Asaf Las <roegltd@gmail.com> - 2014-02-10 19:17 -0800
                        Re: Drawing polygons in python turtle geniusrko@gmail.com - 2014-02-10 19:19 -0800
                          Re: Drawing polygons in python turtle Asaf Las <roegltd@gmail.com> - 2014-02-10 19:23 -0800
                  Re: Drawing polygons in python turtle Terry Reedy <tjreedy@udel.edu> - 2014-02-11 04:35 -0500
          Re: Drawing polygons in python turtle Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-02-11 08:17 -0500

#65850 — Drawing polygons in python turtle

Hi
can anyone help finding the angle to draw different polygons shapes

in this example 

import turtle 
wm = turtle.Screen()
alex = turtle.Turtle()
for i in range(5):
    alex.left(216)
    alex.forward(50)
wm.exitonclick() 

Why do we use 216

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#65851

 geniusrko@gmail.com Wrote in message:
> Hi
> can anyone help finding the angle to draw different polygons shapes
> 
> in this example 
> 
> import turtle 
> wm = turtle.Screen()
> alex = turtle.Turtle()
> for i in range(5):
>     alex.left(216)
>     alex.forward(50)
> wm.exitonclick() 
> 
> Why do we use 216
> 

216 degrees doesn't seem to me that it would make a polygon, but
 rather a star.

I can tell you what I remember about geometry, however. To make a
 regular polygon,  you need to turn by a fixed amount and go a
 fixed distance each time. 

For an equilateral triangle,  you turn 120 degrees. For a square, 
 90. For a pentagon,  108.

180 - (360/n) degrees.


-- 
DaveA

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#65853

On Tuesday, February 11, 2014 1:44:28 AM UTC+2, geni...@gmail.com wrote:
> Hi
> 
> can anyone help finding the angle to draw different polygons shapes
> in this example 
> import turtle 
> wm = turtle.Screen()
> alex = turtle.Turtle()
> for i in range(5):
>     alex.left(216)
>      alex.forward(50)
> wm.exitonclick() 
> Why do we use 216

because of every for every turn we need to make angle between edges 
equal to 36. If you will have a look to pentagon definition:
http://en.wikipedia.org/wiki/Pentagon
inner angle is equal to 108. from that you can easily calculate 
the angle between edges of star. 
there is no difference between these 2: 

alex.left(216)
alex.right(144)

change left() to right() and see.

/Asaf

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#65854

On Tuesday, February 11, 2014 2:23:11 AM UTC+2, Asaf Las wrote:
> On Tuesday, February 11, 2014 1:44:28 AM UTC+2, geni...@gmail.com wrote:
> > Hi
> > 
> > can anyone help finding the angle to draw different polygons shapes
> > in this example 
> > import turtle 
> > wm = turtle.Screen()
> > alex = turtle.Turtle()
> > for i in range(5):
> >     alex.left(216)
> >      alex.forward(50)
> > wm.exitonclick() 
> 
> > Why do we use 216
> because of every for every turn we need to make angle between edges 
> equal to 36. If you will have a look to pentagon definition:
> http://en.wikipedia.org/wiki/Pentagon
> inner angle is equal to 108. from that you can easily calculate 
> the angle between edges of star. 
> there is no difference between these 2: 
> alex.left(216)
> alex.right(144)
> 
> change left() to right() and see.
> /Asaf

just a bit add - confusing things here is the reference of 0 degree turtle 
takes to make turn from. i was also confused when so that (never tried 
turtle before). the 0 degree is the virtual line which is continuation 
of direction from point where forward(50) ends. so when left executes 
it should turn more than 180 to achieve 36 degrees and when right - 
less.

p.s. i am not good in explaining things. 

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#65856

Well how about the star of david what are the angles

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#65859

On Tuesday, February 11, 2014 4:13:16 AM UTC+2, geni...@gmail.com wrote:
> Well how about the star of david what are the angles

hexagon is not constructed similar to your program for pentagon 
because crossing path can't jump from one triangle to another.
you have 60 degrees turn after 2 turns edges will be concatenated.

/Asaf

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#65861

so does that mean i have to draw two separate triangles 

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#65864

On Tuesday, February 11, 2014 4:51:56 AM UTC+2, geni...@gmail.com wrote:
> so does that mean i have to draw two separate triangles

If you need view of crossing triangles - yes, this is the simplest recipe.

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#65865

Is there a better way of drawing such as another modules

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#65867

On Tuesday, February 11, 2014 5:01:33 AM UTC+2, geni...@gmail.com wrote:
> Is there a better way of drawing such as another modules

Could you please elaborate with question? What do you mean?

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#65868

A better way to draw stuff on screen

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#65869

On Tuesday, February 11, 2014 5:06:11 AM UTC+2, geni...@gmail.com wrote:
> A better way to draw stuff on screen

It depends on particular case/figure you wish to draw. 
Drawing is separate knowledge field with its own set of algorithms. 
Geometry is field of wonders. 

i never dealt with this stuff actually. 

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#65871

Going off-topic Which resource do you recommend for learning this wonderful language

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#65872

On Tuesday, February 11, 2014 5:19:52 AM UTC+2, geni...@gmail.com wrote:
> Going off-topic Which resource do you recommend for learning this 
> wonderful language

My advice won't be good as mentioned before i never dealt with it. 
You have chance to discover that country yourself or wait for advice of 
others or do both at same time. 

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#65895

On 2/10/2014 10:01 PM, geniusrko@gmail.com wrote:
> Is there a better way of drawing such as another modules

Logo is a drawing language designed for kids who do not know geometry 
but can imagine walking around on a dirt field and occasionally turning 
while dragging a stick or dripping paint. Part of the charm is 
discovering the patterns that emerge when simple actions are repeated.

The Python version, turtle, is built on top of tkinter and its Canvas 
widget. Since I *do* know coordinate geometry and don't care about the 
moving animal metaphor, I find it easier to use Canvas directly. This 
avoids the bugs and limitations (including speed) introduced by the 
turtle module.


-- 
Terry Jan Reedy

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#65904

On Mon, 10 Feb 2014 18:13:16 -0800 (PST), geniusrko@gmail.com declaimed the
following:

>Well how about the star of david what are the angles

	The Star of David is not single polygon... It is two equilateral
triangles overlayed. You can not draw one using a single pen stroke and
fixed turn angle.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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