An gtTheme stores a theme to visualise vector and raster
objects. It is recommended to use setTheme to modify a
gtTheme, because it carries out all the checks and makes sure that
names of the parameters are properly matched.
title[named list(3)]
properties of the title.
box[named list(5)]
properties of the bounding box.
xAxis[named list(5)]
properties of the x-axis, its labels
and ticks.
yAxis[named list(5)]
properties of the y-axis, its labels
and ticks.
grid[named list(5)]
properties of the major and minor grid.
legend[named list(9)]
properties of the legend, its title,
labels, ticks and bounding box.
scale[names list(6)]
properties of scaling parameters to
attributes/variables.
parameters[named list(7)]
parameters of the plot object.