Re: Generating SVG from turtle graphics

[Abdur-Rahmaan Janhangeer]

https://image.online-convert.com/convert-to-svg

On 15 Jan 2018 02:55, "Niles Rogoff"  wrote:

> On Sun, 14 Jan 2018 16:32:53 +0400, Abdur-Rahmaan Janhangeer wrote:
>
> > maybe save to .png then use another tool to svg
>
> PNG is a bitmap format[1], so you can't covert it to an SVG (a vector
> format) without guessing things like the start/end points of the lines,
> their slopes, etc... not to mention things like arcs.
>
> [1] RFC2083
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Re: Generating SVG from turtle graphics

[Anssi Saari]

Peter Otten <__pete...@web.de> writes:

> Then convert to SVG with an external tool. It looks like ghostscript can do
> that:
>
> $ gs -dBATCH -dNOPAUSE -sDEVICE=svg -sOutputFile=tmp_turtle.svg tmp_turtle.ps

And if not (I at least don't have svg output on three ghostscripts I
tried), pstoedit can do it too.

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Re: Generating SVG from turtle graphics

[Niles Rogoff]

On Sun, 14 Jan 2018 16:32:53 +0400, Abdur-Rahmaan Janhangeer wrote:

> maybe save to .png then use another tool to svg

PNG is a bitmap format[1], so you can't covert it to an SVG (a vector 
format) without guessing things like the start/end points of the lines, 
their slopes, etc... not to mention things like arcs.

[1] RFC2083
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Re: Generating SVG from turtle graphics

[Serhiy Storchaka]

11.01.18 13:03, Steven D'Aprano пише:

I'd like to draw something with turtle, then generate a SVG file from it.

Is this possible?

If not, is there something I can do which lets me plot lines, shapes and
curves and output to SVG?


You can translate the following Tcl/Tk recipe to Python/Tkinter: 
http://wiki.tcl.tk/4534. Or just run the code directly in the buildin 
Tcl interpreter.


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Re: Generating SVG from turtle graphics

[Abdur-Rahmaan Janhangeer]

maybe save to .png then use another tool to svg

On 11 Jan 2018 15:06, "Steven D'Aprano" <
steve+comp.lang.pyt...@pearwood.info> wrote:

> I'd like to draw something with turtle, then generate a SVG file from it.
>
> Is this possible?
>
> If not, is there something I can do which lets me plot lines, shapes and
> curves and output to SVG?
>
> Ideally, I'd like to draw a figure pixel by pixel, and then have the SVG
> library fit a bezier curve to it.
>
>
>
>
> --
> Steve
>
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>
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Re: Generating SVG from turtle graphics

[Peter Otten]

Steven D'Aprano wrote:

> I'd like to draw something with turtle, then generate a SVG file from it.
> 
> Is this possible?

If this is a one-off job consider creating Postscript from the underlying 
Canvas:

>>> import turtle
>>> for i in range(12):
... turtle.forward(100)
... turtle.left(150)
... 
>>> turtle.getcanvas().postscript(file="tmp_turtle.ps")
[...]

Then convert to SVG with an external tool. It looks like ghostscript can do
that:

$ gs -dBATCH -dNOPAUSE -sDEVICE=svg -sOutputFile=tmp_turtle.svg tmp_turtle.ps


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Re: Generating SVG from turtle graphics

[Thomas Jollans]

On 2018-01-11 12:03, Steven D'Aprano wrote:
> I'd like to draw something with turtle, then generate a SVG file from it.
> 
> Is this possible?
> 
> If not, is there something I can do which lets me plot lines, shapes and 
> curves and output to SVG?
> 
> Ideally, I'd like to draw a figure pixel by pixel, and then have the SVG 
> library fit a bezier curve to it.
> 

You *could* use matplotlib, which can export to SVG.

Of course, the API is far from ideal for drawing arbitrary shapes --
though it's naturally quite good with lines.

There are some helpful examples in the docs:

https://matplotlib.org/examples/
https://matplotlib.org/examples/shapes_and_collections/index.html

https://matplotlib.org/api/patches_api.html
https://matplotlib.org/api/pyplot_summary.html
... and so on ...


I just played around with it for a few minutes to get a feel for how
much boilerplate you need -

###

from matplotlib import pyplot as plt
from matplotlib.patches import Circle, Rectangle
import numpy as np

ax = plt.gca()
ax.set_ylim([-2, 2])
ax.set_xlim([-2, 2])
ax.set_aspect('equal')
plt.axis('off')

circle = Circle([0,0], 1, fc='red', ec='none')
halfdiag = np.sqrt(0.5)
rect = Rectangle([-halfdiag, -halfdiag],
 2*halfdiag, 2*halfdiag,
 fc='yellow', ec='none')

ax.add_patch(circle)
ax.add_patch(rect)

plt.savefig('/tmp/test.svg')

###

- and this gave a reasonable-looking SVG -

###


http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd;>

http://www.w3.org/2000/svg;
xmlns:xlink="http://www.w3.org/1999/xlink;>
 
  
*{stroke-linecap:butt;stroke-linejoin:round;}
  
 
 
  
   
  
  
   

   
   

   
  
 
 
  
   
  
 

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Re: Generating SVG from turtle graphics

[Lele Gaifax]

Steven D'Aprano  writes:

> Ideally, I'd like to draw a figure pixel by pixel, and then have the SVG 
> library fit a bezier curve to it.

Uhm, dunno if it is a good approach, it really depends on the kind of
"figures" you are going to draw.

Anyway, in the past I used http://pyx.sourceforge.net/ to produce the images
for a book[1] on the Carrom game, and I enjoyed its simplicity.

ciao, lele.

[1] https://bitbucket.org/lele/cta
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nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
l...@metapensiero.it  | -- Fortunato Depero, 1929.

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Generating SVG from turtle graphics

[Steven D'Aprano]

I'd like to draw something with turtle, then generate a SVG file from it.

Is this possible?

If not, is there something I can do which lets me plot lines, shapes and 
curves and output to SVG?

Ideally, I'd like to draw a figure pixel by pixel, and then have the SVG 
library fit a bezier curve to it.




-- 
Steve

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