By default, explicitly given functions are plotted for the whole of the visible part of the
x-axis. (See the section called “Extensions” to change this for individual
functions.) For every pixel on the x-axis KmPlot calculates a function value.
If the plotting area contains the resulting point it is connected to the last
drawn point by a line.
Parametric functions are plotted for parameter values from 0 upto 2π.
This range can also be set using the D extension (see the section called “Extensions”).