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annotate light9/chase.py @ 1321:715a442c2635

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cursor use d3.scales for coordinate system transforms Ignore-this: 373c3e855697624dc05e4555863002d4
author Drew Perttula <drewp@bigasterisk.com>
date Fri, 03 Jun 2016 22:00:24 +0000
parents 1c590824dd14
children 7772cc48e016
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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6c3b487e7bbc Basic chase logic (does not do bounces correctly)
David McClosky <dmcc@bigasterisk.com>
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1 from __future__ import division
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2
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3 def chase(t, ontime=0.5, offset=0.2, onval=1.0,
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4 offval=0.0, names=None, combiner=max):
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5 names = names or []
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6 # maybe this is better:
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7 # period = ontime + ((offset + ontime) * (len(names) - 1))
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8 period = (offset + ontime) * len(names)
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9 outputs = {}
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10 for index, name in enumerate(names):
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11 # normalize our time
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12 local_offset = (offset + ontime) * index
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13 local_t = t - local_offset
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14 local_t %= period
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16 # see if we're still in the on part
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17 if local_t <= ontime:
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18 value = onval
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19 else:
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20 value = offval
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21
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22 # it could be in there twice (in a bounce like (1, 2, 3, 2)
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23 if name in outputs:
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24 outputs[name] = combiner(value, outputs[name])
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25 else:
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26 outputs[name] = value
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27 return outputs
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29 if __name__ == "__main__":
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30 # a little testing
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31 for x in range(80):
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32 x /= 20.0
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33 output = chase(x, onval='x', offval=' ', ontime=0.1, offset=0.2,
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34 names=('a', 'b', 'c', 'd'))
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35 output = output.items()
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36 output.sort()
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37 print "%.2f\t%s" % (x, ' '.join([str(x) for x in output]))