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Shortcut for accessing graph-component attributes
Changing attributes of graphs requires one to set attributes of various graph
components. In order to simplify this, PyX provides a shortcut in the
constructors of these components. ... A simple example is the following code
snippet, which turns on the x-axis grid in a graph:
graph.graphxy(x=graph.axis.lin(painter=graph.axis.painter.regular(gridattrs=[])))
The same effect can be obtained by the much shorter version
graph.graphxy(x_painter_gridattrs=[])
Here, the hierarchy of components used in the `graphxy` constructor is
indicated by underscores. The part before the first underscore denotes the axes
to be modified. In this example, this is the x-axis. The second part defines
the component of this axis which should be changed. Here, this is the axis
`painter`. Note that the base for this change is the x-axis of the graphxy,
which in the present case is the default value `graph.axis.lin`. Finally, the
third part defines which attribute of the component should be set. In the
example, we enable the grid by setting `gridattrs` to a value different from
`None`. Again, this change assumes that the default painter
`graph.axis.painter.regular` is used.
If you want to replace a component, you have to set it explicitly. Suppose we
want to have a log with a grid. This can be achieved by the following code:
graph.graphxy(x=graph.axis.log(painter=graph.axis.painter.regular(gridattrs=[])))
The same effect can be obtained by the shorter version
graph.graphxy(x=graph.axis.log(), x_painter_gridattrs=[])
or alternatively
graph.graphxy(x=graph.axis.log(painter_gridattrs=[]))
This example demonstrates this shorter form of graph-component attributes
setting and produces the same result as the example [Drawing a graph with grid lines grid.html].
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