mirror of https://github.com/Kozea/pygal.git
Python to generate nice looking SVG graph
http://pygal.org/
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121 lines
2.3 KiB
121 lines
2.3 KiB
10 years ago
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===============
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Documentation
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===============
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Interpolations
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==============
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.. contents::
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Without interpolation:
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----------------------
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``interpolate``
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.. pygal-code::
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chart = pygal.Line()
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chart.add('line', [1, 5, 17, 12, 5, 10])
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With cubic interpolation:
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-------------------------
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``interpolate``
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.. pygal-code::
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chart = pygal.Line(interpolate='cubic')
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chart.add('line', [1, 5, 17, 12, 5, 10])
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With quadratic interpolation:
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-----------------------------
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``interpolate``
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.. pygal-code::
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chart = pygal.Line(interpolate='quadratic')
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chart.add('line', [1, 5, 17, 12, 5, 10])
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With lagrange interpolation:
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----------------------------
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``interpolate``
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.. pygal-code::
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chart = pygal.Line(interpolate='lagrange')
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chart.add('line', [1, 5, 17, 12, 5, 10])
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With trigonometric interpolation:
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---------------------------------
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``interpolate``
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.. pygal-code::
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chart = pygal.Line(interpolate='trigonometric')
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chart.add('line', [1, 5, 17, 12, 5, 10])
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With hermite interpolation:
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---------------------------
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``interpolate``
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.. pygal-code::
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chart = pygal.Line(interpolate='hermite')
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chart.add('line', [1, 5, 17, 12, 5, 10])
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For hermite you can also pass additionnal parameters to configure tangent behaviour:
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.. pygal-code::
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chart = pygal.Line(interpolate='hermite', interpolation_parameters={'type': 'finite_difference'})
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chart.add('line', [1, 5, 17, 12, 5, 10])
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.. pygal-code::
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chart = pygal.Line(interpolate='hermite', interpolation_parameters={'type': 'cardinal', 'c': .75})
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chart.add('line', [1, 5, 17, 12, 5, 10])
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.. pygal-code::
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chart = pygal.Line(interpolate='hermite', interpolation_parameters={'type': 'kochanek_bartels', 'b': -1, 'c': 1, 't': 1})
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chart.add('line', [1, 5, 17, 12, 5, 10])
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For more information see the `wikipedia article <http://en.wikipedia.org/wiki/Cubic_Hermite_spline#Finite_difference>`_
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Interpolation precision
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-----------------------
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``interpolation_precision``
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You can change the resolution of the interpolation with the help of `interpolation_precision`:
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.. pygal-code::
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chart = pygal.Line(interpolate='quadratic')
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chart.add('line', [1, 5, 17, 12, 5, 10])
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.. pygal-code::
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chart = pygal.Line(interpolate='quadratic', interpolation_precision=3)
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chart.add('line', [1, 5, 17, 12, 5, 10])
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Next: `Sparklines </sparks>`_
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