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Imported script, and created README.
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Maurizio Monge
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# Kanimaji # | ||
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## Generation of animations ## | ||
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This is a small utility for transforming KanjiVG images into animates SVG of GIF files. | ||
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## Dependencies ## | ||
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Kanimaji depends on | ||
* [Python 2.7]() with lxml support. | ||
* [svg.path](https://pypi.python.org/pypi/svg.path) Python library, for approximating path lengths. | ||
If you want to be able to generate animated GIF, you will also need: | ||
* [svgexport](https://github.com/shakiba/svgexport) Python library, for exporting SVG to PNG. | ||
* [ImageMagick](www.imagemagick.org)'s convert program to merge PNG's into a GIF | ||
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## Usage ## | ||
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Just run | ||
``` | ||
./kanimaji.py file1.svg file2.svg ... | ||
``` | ||
where the files are KanjiVG SVG files (could work with other SVG files, but it hasn't been tested). | ||
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## Settings ## | ||
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Just edit the settings.py file, all settings are explained there. In this file you can also enable/disable SVG and GIF generation. | ||
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## License ## | ||
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You are free to do what you want with this program, please credit my work you use it. | ||
If you find it useful and feel like, you may give a donation on my github page! |
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import math | ||
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Infinity = float("inf") | ||
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def thrt(x): | ||
return math.pow(x, 1.0/3) if x>0 else -math.pow(-x, 1.0/3) | ||
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def sqrt(x): | ||
return math.sqrt(x) if x>0 else 0 | ||
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def sq(x): | ||
return x*x | ||
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def cb(x): | ||
return x*x*x | ||
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# x(t) = t^3 T + 3t^2(1-t) U + 3t(1-t)^2 V + (1-t)^3 W | ||
def time(pt1, ct1, ct2, pt2, x): | ||
#var C = Cubic, a,b,c,d,p,q,lambda,sqlambda,tmp,addcoef,t,qb,qc,norm,angle,fact; | ||
a = pt1.x - 3*ct1.x + 3*ct2.x - pt2.x | ||
b = 3*ct1.x - 6*ct2.x + 3*pt2.x | ||
c = 3*ct2.x - 3*pt2.x | ||
d = pt2.x - x | ||
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if(abs(a) < 0.000000001): #quadratic | ||
if(abs(b) < 0.000000001): #linear | ||
return -d/c | ||
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qb = c/b | ||
qc = d/b | ||
tmp = sqrt(sq(qb)-4*qc) | ||
return (-qb +(tmp if (qb>0 or qc<0) else -tmp)) / 2 | ||
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p = -sq(b)/(3*sq(a)) + c/a | ||
q = 2*cb(b/(3*a)) - b*c/(3*sq(a)) + d/a | ||
addcoef = -b/(3*a) | ||
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lmbd = sq(q)/4 + cb(p)/27 | ||
if(lmbd >= 0): #real | ||
sqlambda = sqrt(lmbd) | ||
tmp = thrt(-q/2 + (sqlambda if q<0 else -sqlambda)) | ||
return tmp - p/(3*tmp) + addcoef | ||
else: | ||
norm = sqrt(sq(q)/4 - lmbd) | ||
if(norm < 0.0000000001): | ||
return addcoef | ||
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angle = math.acos(-q/(2*norm)) / 3 | ||
fact = 2 * thrt(norm) | ||
t = Infinity | ||
for i in range(-1, 2): | ||
tmp = fact * math.cos(angle + i*math.pi*2/3) + addcoef | ||
if(tmp>=-0.000000001 and tmp < t): | ||
t = tmp | ||
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return t; | ||
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def value(pt1, ct1, ct2, pt2, x): | ||
t = time(pt1, ct1, ct2, pt2, x); | ||
return cb(t)*pt1.y + 3*sq(t)*(1-t)*ct1.y + 3*t*sq(1-t)*ct2.y + cb(1-t)*pt2.y | ||
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class pt: | ||
def __init__(self, x, y): | ||
self.x, self.y = x, y | ||
def __repr__(self): | ||
return "(%f,%f)" % (self.x, self.y) | ||
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if __name__ == "__main__": | ||
pt1 = pt(0,0) | ||
ct1 = pt(0.25, 0.1) | ||
ct2 = pt(0.25, 1.0) | ||
pt2 = pt(1,1) | ||
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part = 100 | ||
with open('ease.txt', 'w') as f: | ||
for i in range(0,part+1,1): | ||
x = float(i) / part | ||
y = value(pt1, ct1, ct2, pt2, x) | ||
f.write("%f %f\n" % (x,y)) |
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