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Stroke and fill attributes
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The previous example anticipated a simple case of setting an attribute when
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stroking paths. This example shows a few more use-cases.
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Attributes can be passed in a list as the second optional argument of the
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`stroke` or `fill` methods of a canvas instance. ... The attributes themselves are
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instances of certain attribute classes. A full list is available in the manual.
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In general, some useful attribute instances are predefined as class attributes
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of the corresponding attribute class. In the given example, the
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`style.linewidth.THICK`, `style.linestyle.dashed`, `style.linecap.round`,
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`color.rgb.red`, `color.rgb.green`, and `color.rgb.blue` are just some examples of
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this type of attribute instances. In contrast, `style.linewidth(0.2)` creates a
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new style instance for the given parameters.
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!! The linewidth instance created by `style.linewidth(0.2)` is different from the
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predefined linewidth instances in PyX in its use of ''user'' units. In the example
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''Adding and joining paths'' of section ''Path features'', the linewidth is
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scaled independently of the ''user'' units, but if you try to double all linewidth
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in the beginning of the script, our self-defined linewidth will not be scaled.
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To obtain the proper scaling behaviour it would be necessary to attach the
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''width'' unit by using
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style.linewidth(0.2*unit.w_cm)
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examples/drawing/style.txt
