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axis_artist.py module provides axis-related artists. They are

 * axis line
 * tick lines
 * tick labels
 * axis label
 * grid lines

The main artist class is a AxisArtist and a GridlinesCollection. The
GridlinesCollection is responsible for drawing grid lines and the
AxisArtist is responsible for all other artists. The AxisArtist class
has attributest that are associated with each type of artists.

 * line : axis line
 * major_ticks : major tick lines
 * major_ticklabels : major tick labels
 * minor_ticks : minor tick lines
 * minor_ticklabels : minor tick labels
 * label : axis label

Typically, the AxisArtist associated with a axes will be accessed with
the *axis* dictionary of the axes, i.e., the AxisArtist for the bottom
axis is

  ax.axis["bottom"]

where *ax* is an instance of axes (mpl_toolkits.axislines.Axes).
Thus, ax.axis["bottom"].line is an artist associated with the axis line, and ax.axis["bottom"].major_ticks is an artist associated with the major tick lines.

You can change the colors, fonts, line widths, etc. of these artists
by calling sutable set method. For example, to change the color of the major ticks of the bottom axis to red,

  ax.axis["bottom"].major_ticks.set_color("r")

However, things like the locations of ticks, and their ticklabels need
to be changed from the side of the grid_helper.

axis_direction
--------------

AxisArtist, AxisLabel, TickLabels have *axis_drection* attribute,
which adjusts the location, angle, etc.,. The *axis_direction* must be
one of [left, right, bottom, top] and they follow the matplotlib
convention for the rectangle axis.

For example, for the *bottom* axis (the left and right is relative to
the direction of the increasing coordinate),

 * ticklabels and axislabel are on the right
 * ticklabels and axislabel have text angle of 0
 * ticklabels are baseline, center-aligned
 * axislabel is top, center-aligned


The text angles are actually relative to (90 + angle of the direction
to the ticklabel), which gives 0 for bottom axis.

                        left bottom right top
 ticklabels location    left right  right left
 axislabel location     left right  right left
 ticklabels angle       90    0      -90  180
 axislabel angle        180   0     0     180
 ticklabel va           center baseline center baseline
 axislabel va           center top      center btoom
 ticklabel ha           right  center   right  center
 axislabel ha           right  center   right  center


Ticks are by default direct opposite side of the ticklabels. To make
ticks to the same side of the ticklabels,

  ax.axis["bottom"].major_ticks.set_ticks_out(True)


Following attributes can be customized (use set_xxx method)

 * Ticks : ticksize, tick_out
 * TickLabels : pad
 * AxisLabel : pad

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    Ticks are derived from Line2D, and note that ticks themselves
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