- INTERNAL:\\
- calc\_map () Calculate wc to ndc factors\\
- clip(rectangle[4], x1, y1, x2, y2) Clip a line againt rectangle\\
+\subsubsection{State Commands}
+\begin{twocollist}
+\twocolitem{Window(xmin, ymin, xmax, ymax)}{Set window for world
+coordinates} \twocolitem{MoveAbs(x, y)}{Move graphics cursor}
+\twocolitem{MoveRel(dx, dy)}{} \twocolitem{PointAbs (x, y)}{Plot
+point at current position} \twocolitem{PointRel (dx, dy)}{}
+\twocolitem{LineAbs2 (x, y)}{Draw line from current point to
+point} \twocolitem{LineRel2 (dx, dy)}{} \twocolitem{MarkerAbs2 (x,
+y)}{Draw marker at current position} \twocolitem{MarkerRel2 (dx,
+dy)}{} \twocolitem{PolylineAbs (x[], y[], n)}{Draw a set of lines}
+\twocolitem{PolylineRel (dx[], dy[], n)}{}
+\twocolitem{wc\_to\_ndc(xwc, ywc, xndc, yndc)}{Convert from world
+coord to NDC} \twocolitem{ndc\_to\_wc(xndc, yndc, xwc,
+ywc)}{Convert from NDC to world coord} \twocolitem{DrawText
+(str)}{Draw text string at current positon}
+\end{twocollist}