C-PLOT

Contents → Graphics Filter Commands → zs close filter, synchronous → Pen numbering

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C-PLOT graphics filters are written to conform to the pen-numbering conventions described in this section. These conventions allow a command file to produce consistent plots on pen plotters, laser printers and mono or color video monitors.

The plot program itself doesn't distinguish among pen numbers (except to ignore numbers greater than 1000 when selecting the pen-plotter pen). The number entered with the z# command is simply passed on to a graphics filter. The code in each filter can use or ignore the pen number, depending on the device characteristics. Not all pen numbers will be functional on all filters.

Line-width values are interpreted in C-PLOT basic units, where there are 40 basic units in 1 C-PLOT millimeter. A line width of zero should select the thinnest line available on a device.

The following table shows the recommended correspondence between pen number and attribute:

0-999   drawing colors   4000-4999   line widths   1000-1999   white-fill fill colors   5000-5999   symbol outline widths   2000-2999   black-fill fill colors   9000-9999   flags   3000-3999   background colors   9100-9900   filter-dependent flags

The colors associated with pen numbers 1000 through 3999 modulus 1000 are to be the same as the colors associated with pen numbers 0 through 999.

Pens 0, 1000, 2000 and 3000 track the background color assigned with pens 3002-3999. By drawing with pen 0, you can erase previously drawn portions of the plots. Pens 1, 1001, 2001 and 3001 track the foreground color assigned with pens 10-999.

The following 9000-series flags have been defined:

9001   turns symbol filling on   9002   turns symbol filling off   9003   turns black-filled symbol outlines on   9004   turns black-filled symbol outlines off   9999   resets all attributes to startup default values

When symbol filling is on, the interior of the symbols is painted solidly with the fill color. When off, white-filled symbols show through what is underneath, and black-filled symbols are colored by drawing a grid of lines. The startup default is to have symbol filling on.

The white-filled symbols are those selected with the sy command using symbol codes 0, 1, 2, 3, 8, 12, 14-28. The black-filled symbols have symbol codes 4, 5, 6, 7, 10, 11 and 13. White-filled symbols are always outlined by the current line color. Black-filled symbols are outlined with the current background color or not at all if the no-outline flag has been selected. The startup default is to have black-filled symbol outlines drawn.

The following pen color assignments are standardized for color display devices:

0 -- background   5 -- yellow   1 -- foreground   6 -- cyan (blue-green)   2 -- blue   7 -- magenta (blue-red)   3 -- red   8 -- white   4 -- green   9 -- black

The colors for VGA and EGA graphics on 386 and 486 PC computers are as follows:

0 -- black   \09 -- black   1 -- bright white   10 -- light blue   2 -- blue   11 -- light green   3 -- red   12 -- light cyan   4 -- green   13 -- light red   5 -- yellow   14 -- light magenta   6 -- cyan   15 -- brown   7 -- magenta   16 -- gray   8 -- bright white   17 -- white

The colors available on X Windows, SunView, color PostScript and HP-GL follow:

\00 -- white   38 -- olive drab   \01 -- black   39 -- medium sea green   \02 -- blue   40 -- med. spring green   \03 -- red   41 -- pale green   \04 -- green   42 -- sea green   \05 -- yellow   43 -- spring green   \06 -- cyan   44 -- yellow green   \07 -- magenta   45 -- dark slate gray   \08 -- white   46 -- dim gray   \09 -- black   47 -- light gray   10 -- aquamarine   48 -- gray   11 -- med. aquamarine   49 -- khaki   12 -- blue   50 -- magenta   13 -- cadet blue   51 -- maroon   14 -- cornflower blue   52 -- orange   15 -- dark slate blue   53 -- orchid   16 -- light blue   54 -- dark orchid   17 -- light steel blue   55 -- medium orchid   18 -- medium blue   56 -- pink   19 -- med. slate blue   57 -- plum   20 -- midnight blue   58 -- red   21 -- navy blue   59 -- Indian red   22 -- sky blue   60 -- medium violet red   23 -- slate blue   61 -- orange red   24 -- steel blue   62 -- violet red   25 -- coral   63 -- salmon   26 -- cyan   64 -- sienna   27 -- firebrick   65 -- tan   28 -- brown   66 -- thistle   29 -- sandy brown   67 -- turquoise   30 -- gold   68 -- dark turquoise   31 -- goldenrod   69 -- medium turquoise   32 -- light goldenrod   70 -- violet   33 -- green   71 -- blue violet   34 -- dark green   72 -- wheat   35 -- dark olive green   73 -- yellow   36 -- forest green   74 -- green yellow   37 -- lime green

Colors 75 to 175 are 101 shades of gray from black to white.

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