-\subsubsection{World Coordinate Level}%
- initgrf2 () Initialize 2 dimensional graphics\\
- termgrf2 () Terminate 2 dimensional graphics\\
- Window (xmin, ymin, xmax, ymax) Set window for world coordinates\\
- Viewport (xmin, ymin, xmax, ymax) Viewport for window in NDC\\
- MoveAbs (x, y) Move graphics cursor\\
- MoveRel (dx, dy)\\
- PointAbs (x, y) Plot point at current position\\
- PointRel (dx, dy)\\
- LineAbs2 (x, y) Draw line from current point to point\\
- LineRel2 (dx, dy)\\
- MarkerAbs2 (x, y) Draw marker at current position\\
- MarkerRel2 (dx, dy)\\
- PolylineAbs (x[], y[], n) Draw a set of lines\\
- PolylineRel (dx[]. dy[]. n)\\
- wc\_to\_ndc (xwc, ywc, xndc, yndc) Convert from world coord to NDC\\
- ndc\_to\_wc (xndc, yndc, xwc, ywc) Convert from NDC to world coord\\
- DrawText (str) Draw text string at current positon\\
+\subsection{Master coordinate functions}
+\begin{twocollist}
+\twocolitem{\texttt{setWindow(xmin,ymin,xmax,ymax)}}{Set window for world
+coordinates}
+\twocolitem{\texttt{moveAbs(x,y)}}{Move graphics cursor to absolute position}
+\twocolitem{\texttt{moveRel(dx,dy)}}{Move graphics cursor relative to current position}
+\twocolitem{\texttt{pointAbs(x,y)}}{Draw point at current position}
+\twocolitem{\texttt{pointRel(dx,dy)}}{Draw point relative to current position}
+\twocolitem{\texttt{lineAbs(x,y)}}{Draw line from current position to
+absolute position}
+\twocolitem{\texttt{lineRel(dx,dy)}}{Draw line from current position to position
+relative to current position}
+\twocolitem{\texttt{markerAbs(x,y)}}{Draw marker at current position}
+\twocolitem{\texttt{markerRel(dx,dy)}}{Draw marker relative to current position}
+\twocolitem{\texttt{polylineAbs(x[],y[],n)}}{Draw a series of lines to absolute position}
+\twocolitem{\texttt{polylineRel(dx[],dy[],n)}}{Draw series of lines relative to current position}
+\twocolitem{\texttt{drawString(str)}}{Draw text string at current positon}
+\twocolitem{\texttt{drawCircle(r)}}{Draw circle at current positon}
+\twocolitem{\texttt{drawArc(r,start,stop)}}{Draw arc with center at current positon}
+\twocolitem{\texttt{drawRect(xmin,ymin,xmax,ymax)}}{Draw rectangle}
+\end{twocollist}