FXPlot is based on FOX-toolkit.
One can use FXPlot to obtain 2D plots like this:
 
There is a specialization of the 2D plots for statistical process control charts:
 
If using Eclipse, just follow the steps at File->Import...->Existing Project Into Workspace.
Or from the console:
$ unzip FXPlot<VERSION>.zip $ cd FXPlot<VERSION> $ scons
The above commands will build the library at lib directory and the test samples at the bin directory.
In order to build the debug version one can use:
$ scons configuration=debug
This documentation can be generated at doc/html with the following command: 
scons documentation
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 1.4.4
 1.4.4