5.12.2. - Using a pen plotter
You can set the plot window with the pen plotter's controls. With no arguments to
wi, and if the pen plotter is initialized, you
are asked to set the size of the window using the plotter controls.
Enter
<return> to use the current window.
Otherwise, set the
plotter's scaling points (P1 and P2) to two corners of the desired
plot window according to the pen plotter manual, then enter
<return>. The current window size will be displayed.
Different models of pen plotters have different sizes for their available plotting areas. Before the plotter is initialized, the size that C-PLOT assumes for a plotting area is set to match that of the HP7440A plotter with A-size paper, 19.125×25.75 centimeters (10.14×7.53 inches). The position of the window on the page is set with respect to this page size. If a pen plotter with a different plotting area is initialized, C-PLOT will use that area. The relative position of plots drawn using different plotter areas but the same arguments to
wi will vary.
Since the window sizes and position (along
with character sizes) are specified in pen-plotter centimeter units,
the actual size of plots will not vary.
Unless the
sc command has been used to select filter scaling
factors, the current plotting area will be mapped to
the entire graphics-filter
plotting area, and the aspect ratio between the axes will not be maintained.
Once you initialize the plotter, C-PLOT remembers that plotter's available area, even after you release it (see
rp, Chapter 7).
Don't spend too much time fine-tuning the look of a plot
using a filter device if you plan to plot it on a pen plotter (other
than the HP7440A) without first initializing the plotter to read in
its available area.