libplot

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libplot

To draw the bloch sphere, the GNU libplot library is used. Libplot is a freely available C/C++ function library for device-independent 2-D vector graphics. The C++ class library is called libplotter, which provides an object-oriented interface to libplot's functionality, is used in this project. To use libplot, a pointer to a Plotter object is created with the command;

$\begin{lstlisting}[frame=trbl]{} Plotter *plot; \end{lstlisting}$

The page size and picture size are set by the following commands;
$\begin{lstlisting}[frame=trbl]{} Plotter::parampl(''PAGESIZE'', (void*)optPlotPa... ...str()); Plotter::parampl(''BITMAPSIZE'', (void*)''400x400''); \end{lstlisting}$

The line size and colour can be set with the following commands;
$\begin{lstlisting}[frame=trbl]{} plot->flinewidth (0.25); plot->pencolorname(const char *name); \end{lstlisting}$

The Plotter object can draw strings on the screen with the following command;
$\begin{lstlisting}[frame=trbl]{} plot->fmove (double x, double y); plot->alabel(int horiz_justify, int vert_justify, const char *s); \end{lstlisting}$

The circle for the Bloch Sphere can be drawn with the command;
$\begin{lstlisting}[frame=trbl]{} plot->circle(int xc, int yc, int r); \end{lstlisting}$

The axes can be drawn with the command;
$\begin{lstlisting}[frame=trbl]{} plot->line(int x1, int y1, int x2, int y2); \end{lstlisting}$

The semi-circle ellipse at the center of the sphere can be drawn with the command;
$\begin{lstlisting}[frame=trbl]{} plot->ellipse (int xc, int yc, int rx, int ry, int angle); \end{lstlisting}$

The filled circle which represents the position of the qubit on the bloch sphere, can be drawn with the command;
$\begin{lstlisting}[frame=trbl]{} plot->fmarker(double x, double y, int type, double size); \end{lstlisting}$

Next: Bison/Flex - Adding a Up: The Bloch Sphere Previous: The Bloch Sphere Contents

Colm O hEigeartaigh 2003-05-30