axis
Class
Implements axis displays for the horizontal and vertical dimensions of
a Plotter window. Use log-axis for logarithmic
displays.
axis supports the following slot initializations:
:minimum number- The minimum value displayed on the axis. Defaults to 0.
:maximum number- The maximum value displayed on the axis. An axis must have a
maximum set but this value can be changed during the display.
:increment number- The stepping amount between axis value labels displayed along the
axis. log-axis treats this value as
the logarithm base and allows the keyword
:base to be used in place of :increment.
:ticks-per-increment number- The number of ticks, or graduals, drawn within each increment along
the axis. If the value is 1 then a single large tick is drawn at each
label point. If the value is more than 1 the additional ticks are
drawn slightly smaller and evenly spaced within the
increment.
:slot {symbol | list}- The slot or slots in CLOS data that the axis accesses in order to
plot values. If one slot is specified it determines the position along
the axis that the value will appear. If a list of two slots is
specified then the second slot controls the point's extent (width or height) along the axis.
:labeler {string | function}- Either a format string or a Lisp function of one argument that
will be called to produce each label string drawn along the axis.
Defaults to "~2,F", which displays a
floating point value rounded to two places.
:zoom number- A zooming scaler for the axis display, defaults to 1. Since this
value scales the size of plotter's off-screen bitmap be
reasonable.
:pixels-per-increment number- The number of pixels each increment claims along the axis at
:zoom 1. Defaults to 60 since this number is
evenly divisible by so many common values of :ticks-per-increment.
:pixels-per-label number- The width/height in pixels of the labeling area on either side of
the vertical/horizontal axis lines. Defaults to 60.
Examples
See the Examples section in
the Plotter topic documentation.
See also