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from visual import * | ||
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print(""" | ||
#!/usr/bin/env python | ||
#coding:utf-8 | ||
""" | ||
Click to plot a normalized electric field vector. | ||
Vectors are blue if low magnitude, red if high. | ||
Right button drag or Ctrl-drag to rotate camera to view scene. | ||
Middle button drag or Alt-drag to zoom in or out. | ||
On a two-button mouse, middle is left + right. | ||
""") | ||
""" | ||
from __future__ import print_function, division | ||
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#from visual import * | ||
import visual as vp | ||
print(__doc__) | ||
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ec = 1.6e-19 # electron charge | ||
EC = 1.6e-19 # electron charge | ||
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scene.title="Electric Field Vectors" | ||
scene.range = 2e-13 | ||
vp.scene.title = "Electric Field Vectors" | ||
vp.scene.range = 2e-13 | ||
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charges = [ sphere( pos = (-1e-13,0,0), Q = ec, color=color.red, radius = 6e-15 ), | ||
sphere( pos = ( 1e-13,0,0), Q = -ec, color=color.blue, radius = 6e-15 ), | ||
] | ||
CHARGES = [ | ||
vp.sphere(pos=(-1e-13, 0, 0), Q=EC, color=vp.color.red, radius=6e-15), | ||
vp.sphere(pos=(1e-13, 0, 0), Q=-EC, color=vp.color.blue, radius=6e-15), | ||
] | ||
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def getfield(p): | ||
f = vector(0,0,0) | ||
for c in charges: | ||
f = f + (p-c.pos) * 8.988e9 * c.Q / mag(p-c.pos)**3 | ||
return f | ||
def getfield(posn): | ||
""" Get the field at a given point.""" | ||
fld = vp.vector(0, 0, 0) | ||
for chrg in CHARGES: | ||
fld = fld + (posn-chrg.pos) * 8.988e9 * chrg.Q / vp.mag(posn-chrg.pos)**3 | ||
return fld | ||
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while True: | ||
p = scene.mouse.getclick().pos | ||
f = getfield(p) | ||
m = mag(f) | ||
red = maximum( 1-1e17/m, 0 ) | ||
blue = minimum( 1e17/m, 1 ) | ||
if red >= blue: | ||
blue = blue/red | ||
red = 1.0 | ||
POSN = vp.scene.mouse.getclick().pos | ||
FLD = getfield(POSN) | ||
MAG = vp.mag(FLD) | ||
RED = vp.maximum(1-1e17/MAG, 0) | ||
BLUE = vp.minimum(1e17/MAG, 1) | ||
if RED >= BLUE: | ||
BLUE = BLUE/RED | ||
RED = 1.0 | ||
else: | ||
red = red/blue | ||
blue = 1.0 | ||
arrow( pos=p, axis=f * (4e-14/1e17), | ||
shaftwidth = 6e-15, | ||
color=(red,0,blue)) | ||
RED = RED/BLUE | ||
BLUE = 1.0 | ||
vp.arrow(pos=POSN, axis=FLD * (4e-14/1e17), | ||
shaftwidth=6e-15, | ||
color=(RED, 0, BLUE)) |