File:Spinning-disk.svg
Size of this PNG preview of this SVG file: 220 × 146 pixels. Other resolutions: 320 × 212 pixels | 640 × 425 pixels | 1,024 × 680 pixels | 1,280 × 849 pixels | 2,560 × 1,699 pixels.
Original file (SVG file, nominally 220 × 146 pixels, file size: 3 KB)
File information
Structured data
Captions
Summary
editDescriptionSpinning-disk.svg |
English: Illustration of a solid spinning disk |
Date | |
Source | Own work |
Author | Geek3 |
Other versions | Ehrenfest-paradox-disk.svg |
Source Code
editThe image is created by the following source-code. Requirements:
python source code:
#!/usr/bin/python
# -*- coding: utf8 -*-
try:
import svgwrite as svg
except ImportError:
print 'You need to install svgwrite: http://pypi.python.org/pypi/svgwrite/'
exit(1)
from math import *
size = 220, 146
rx, ry = size[0] / 2 - 3, 50
v = float(ry) / float(rx)
l = 40
lw = 2
# document
doc = svg.Drawing('spinning-disk.svg', size=size)
doc['stroke-width'] = lw
doc['fill'] = 'white'
doc['stroke'] = 'black'
doc['stroke-linejoin'] = 'miter'
# background
doc.add(doc.rect(id='background', insert=(0, 0), size=size, stroke='none'))
# disk
grad = doc.defs.add(doc.linearGradient(id='grad', start=('0%',0), end=('100%',0), gradientUnits='objectBoundingBox'))
grad.add_stop_color(offset=0, color='#f7f7f7')
grad.add_stop_color(offset=0.5, color='#dddddd')
grad.add_stop_color(offset=1, color='#999999')
disk = doc.add(doc.g(id='disk', transform='translate(' + str(size[0]/2) + ',' + str(ry+3) + ')'))
path = 'M ' + str(-rx) + ',0 V ' + str(l)
path += ' A ' + str(rx) + ',' + str(ry) + ' 0 1 0 ' + str(rx) + ',' + str(l)
path += ' V 0 Z'
disk.add(doc.path(d=path, fill='url(#grad)', stroke_linejoin='bevel'))
disk.add(doc.ellipse(center=(0, 0), r=(rx, ry), fill='#d8d8d8'))
disk.add(doc.ellipse(center=(0, 0), r=(2, 2.0*v), fill='black'))
radius_angle = radians(-40.0)
csr = cos(radius_angle), sin(radius_angle)
disk.add(doc.line(start=(0,0), end=(rx*csr[0], ry*csr[1]),
stroke_width=lw*sqrt(csr[0]**2 + (v*csr[1])**2)))
# round arrow
ar, aw, ah, ab, al, a0, a1 = 0.7*rx, 7, 2, 1, 3, radians(160), radians(100)
apath = 'M ' + str(ar*cos(a0)) + ',' + str(ar*sin(a0))
apath += ' A %f,%f 0 0 0 %f,%f' % (ar, ar, ar*cos(a1), ar*sin(a1))
arrowhead = doc.defs.add(doc.marker(id='arrowhead', orient='auto', overflow='visible'))
arrowhead.add(doc.path(fill='black', stroke='none',
d='M 0.0,0.0 L %f,%f L %f,0 L %f,%f L 0,0 z'%(-ab, -ah, al, -ab, ah)))
arrow = doc.path(d=apath, fill='none', stroke_width=aw, transform='scale(1,' + str(v) + ')')
arrow['marker-end'] = arrowhead.get_funciri()
disk.add(arrow)
# text
doc.add(doc.path(id='omega', stroke='none', fill='black',
transform='translate(70,70) scale(0.03,-0.03)',
d='M 13 0 m 251 82 c 9 -63 43 -93 94 -93 c 59 0 113 38 153 93 c 75 104 94 \
255 94 289 c 0 71 -37 71 -43 71 c -25 0 -50 -26 -50 -48 c 0 -13 6 -19 15 -27 \
c 32 -33 35 -65 35 -87 c 0 -85 -85 -219 -190 -219 c -9 0 -37 0 -55 23 c -12 \
16 -20 35 -20 55 c 0 3 0 5 6 16 c 19 45 33 100 33 113 c 0 12 -7 23 -21 23 c \
-11 0 -20 -9 -28 -25 c -2 -5 -14 -49 -21 -101 c -2 -18 -2 -20 -9 -27 c -44 \
-61 -90 -77 -124 -77 c -66 0 -88 55 -88 114 c 0 75 37 158 84 225 c 10 14 10 \
16 10 19 c 0 8 -6 12 -12 12 c -16 0 -62 -88 -76 -120 c -37 -89 -38 -171 -38 \
-180 c 0 -80 30 -142 106 -142 c 65 0 113 46 145 93 z'))
doc.add(doc.path(id='r', stroke='none', fill='black',
transform='translate(152,60) scale(0.03,-0.03)',
d='M 29 0 m 59 59 c -3 -15 -9 -38 -9 -43 c 0 -18 14 -27 29 -27 c 12 0 30 8 \
37 28 c 2 4 36 140 40 158 c 8 33 26 103 32 130 c 4 13 32 60 56 82 c 8 7 37 33 \
80 33 c 26 0 41 -12 42 -12 c -30 -5 -52 -29 -52 -55 c 0 -16 11 -35 38 -35 c \
27 0 55 23 55 59 c 0 35 -32 65 -83 65 c -65 0 -109 -49 -128 -77 c -8 45 -44 \
77 -91 77 c -46 0 -65 -39 -74 -57 c -18 -34 -31 -94 -31 -97 c 0 -10 10 -10 12 \
-10 c 10 0 11 1 17 23 c 17 71 37 119 73 119 c 17 0 31 -8 31 -46 c 0 -21 -3 \
-32 -16 -84 z'))
doc.save()
Licensing
editI, 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 |
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.
You may select the license of your choice.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 00:26, 21 January 2013 | 220 × 146 (3 KB) | Geek3 (talk | contribs) | {{Information |Description ={{en|1=Illustration of a solid spinning disk}} |Source =own |Author =Geek3 |Date =21.01.2013 |Permission = |other_versions =Ehrenfest-paradox-disk.svg }} |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Short title | Spinng-disk.svg - Illustration of a spinning solid disk |
---|---|
Image title | from Wikimedia Commons
about: http://commons.wikimedia.org/wiki/Image:Spinning-disk.svg source: http://commons.wikimedia.org/ rights: GNU Free Documentation license,Creative Commons Attribution ShareAlike license |
Width | 220 |
Height | 146 |