mirror of https://github.com/Kozea/pygal.git
Python to generate nice looking SVG graph
http://pygal.org/
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120 lines
2.3 KiB
120 lines
2.3 KiB
=============== |
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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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