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File:VFPt dipole point.svg

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Original file(SVG file, nominally 600 × 600 pixels, file size: 26 KB)


English: A perfect dipole field originating from one point.
Source Own work
Author Geek3
Other versions
SVG developmentW3C grn.svg The source code of this SVG is valid.VectorFieldPlot symbol.svg This plot was created with VectorFieldPlot.


VectorFieldPlot source code
# paste this code at the end of VectorFieldPlot 1.2
doc = FieldplotDocument('VFPt_dipole_point',
    commons=True, width=600, height=600)
field = Field({'dipoles':[[0,0,1,0]]})
n = 16
for i in range(n):
    phi = 2.*pi * (i + 0.5) / n
    a = (-0.5 + (i + 0.5) / n)
    a = a * 3.8e-6 + 1.2e-6 * a**3
    line = FieldLine(field, [0, 0], start_d=[0.0001, a],
        directions='forward', pass_dipoles=0)
    doc.draw_line(line, linewidth=2.4,
        arrows_style={'dist':1.8, 'scale':1.1})

# draw dipole symbol
symb = doc.draw_object('g', {'id':'dipole_symbol',
defs = doc.draw_object('defs', {}, group=symb)
spot = doc.draw_object('radialGradient', {'id':'light_spot',
    'cx':'0.65', 'cy':'0.7', 'r':'0.75'}, group=defs)
for col, of in [['#fff', '0'], ['#ddd', '0.15'],
                ['#aaa', '0.7'], ['#444', '1']]:
    doc.draw_object('stop', {'stop-color':col, 'offset':of}, group=spot)
doc.draw_object('circle', {'cx':'0', 'cy':'0', 'r':'14',
    'style':'fill:url(#light_spot); stroke:#000000; stroke-width:2'},
doc.draw_object('path', {'style':'fill:#000000; stroke:none',
    'd':'M -8,2 H 0 V 8 L 10,0 L 0,-8 V -2 H -8 V 2 Z'}, group=symb)



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September 2010

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current14:18, 28 September 2010Thumbnail for version as of 14:18, 28 September 2010600 × 600 (26 KB)Geek3own work
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