Summary

{{Information

|description =

|date =2015-05-23 |source =Own work |author =Geek3 |other versions =File:VFPt cylindrical magnet.svg (with field lines) |other fields= {{Igen|Python|+|%v|c1=

1. !/usr/bin/python
2. -*- coding: utf8 -*-

try:

   import svgwrite as svg

except ImportError:

   print 'requires svgwrite library: http://pypi.python.org/pypi/svgwrite/'
   exit(1)

name = 'Cylindrical_magnet' w, h = 616, 216 lw = 16 l, r = (w - lw) / 2., (h - lw) / 2.

1. document

doc = svg.Drawing(name + '.svg', size=(w, h)) doc.set_desc(title=name,

   desc='about: http://commons.wikimedia.org/wiki/File:{0}.svg'.format(name))

doc['stroke'] = 'black' doc['stroke-linejoin'] = 'miter'

magnet = doc.add(doc.g(id='magnet', transform='translate({0},{1})'.format(w/2., h/2.)))

1. green and red areas

magnet.add(doc.rect(insert=(-l, -r), size=(2*l, 2*r),

   fill='#00cc00', stroke='none'))

magnet.add(doc.rect(insert=(0, -r), size=(l, 2*r),

   fill='#ff0000', stroke='none'))

1. light reflection gradient overlay

grad = doc.defs.add(doc.linearGradient(id='gradient',

   x1=0, x2=0, y1=-r, y2=r, gradientUnits='userSpaceOnUse'))

for col, of, opa in [['#000000', '0', '0.125'],

   ['#ffffff', '0.07', '0.125'], ['#ffffff', '0.25', '0.5'],
   ['#ffffff', '0.6', '0.2'], ['#000000', '1', '0.33']]:
   grad.add_stop_color(offset=of, color=col, opacity=opa)

1. frame

magnet.add(doc.rect(insert=(-l, -r), size=(2*l, 2*r),

   style='fill:url(#gradient); stroke-width:{0}; stroke-linejoin:miter; stroke:#000000'.format(lw)))

1. S and N labels

S = doc.text('S', insert=(0, 0),

       transform='translate({0},{1}) scale({2},{2})'.format(
       -0.65 * l, 0.44 * r, r / 100.))

N = doc.text('N', insert=(0, 0),

       transform='translate({0},{1}) scale({2},{2})'.format(
       0.65 * l, 0.44 * r, r / 100.))

text_attr = {'text-anchor':'middle',

   'style':'fill:#000000; stroke:none; ' +
   'font-size:120px; font-family:Bitstream Vera Sans'}

for k, v in text_attr.iteritems():

   S[k] = v
   N[k] = v

magnet.add(S) magnet.add(N)

doc.save() try:

   import xml.dom.minidom
   xml = xml.dom.minidom.parse(name + '.svg')
   with open(name + '.svg', 'w') as svg_file:
       svg_file.write(xml.toprettyxml(indent='  '))

except ImportError: pass }} }}

Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

Category:License migration redundant#Cylindrical%20magnet.svgCategory:GFDL#Cylindrical%20magnet.svg

This file is licensed under the Creative Commons Attribution 3.0 Unported license.

You are free:

• to share – to copy, distribute and transmit the work
• to remix – to adapt the work

Under the following conditions:

• attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.

https://creativecommons.org/licenses/by/3.0CC BY 3.0 Creative Commons Attribution 3.0 truetrue

Category:CC-BY-3.0#Cylindrical%20magnet.svg

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Category:Self-published work