The purpose of this Java program it's to plot the graph of functions,
both with one real variable (cartesian and polar coordinates) and
with two real variables (cartesian coordinates).
For the one real variable functions it's included the drawing of the
derivative and the calculus of integrals.
One real variable function (Cartesian)
One real variable function (Polar)
Two real variables function (Cartesian)
Integral calculus panel
It's included an original,simple built-in function parser.
Additionally the user can also change the lines and background colors.