Colour pinstripe/Printer

The task is to create 1 pixel wide colour vertical pinstripes with a sufficient number of pinstripes to span the entire width of the colour graphics printer. The pinstripes should alternate between each individual cartridge ink and ink pair and black and white pinstripes should be included. A typical pinstripe sequence woud be black, red, green, blue, magenta,cyan, yellow, white.

After the first inch of printing, we switch to a wider 2 pixel wide vertical pinstripe pattern. and to 3 pixel wide vertical for the next inch, and then 4 pixel wide, etc. This trend continues for the entire length of the page (or for 12 inches of run length in the case of a printer using continuous roll stationery). After printing the test pattern the page is ejected (or the test pattern is rolled clear of the printer enclosure, in the case of continuous roll printers).

PicoLisp

<lang PicoLisp>(load "@lib/ps.l")

Using circular lists for an endless supply of colors
(black red green blue magenta cyan yellow white)

(setq

  Red   (0    100    0     0    100    0    100   100 .)
  Green (0     0    100    0     0    100   100   100 .)
  Blue  (0     0     0    100   100   100    0    100 .) )

(call 'lpr

  (pdf "pinstripes"
     (a4)  # 595 x 842 dots
     (let (I 0  Step 1)
        (for X 595
           (color (car Red) (car Green) (car Blue)
              (vline X 0 842) )
           (when (= Step (inc 'I))
              (zero I)
              (pop 'Red)
              (pop 'Green)
              (pop 'Blue) )
           (when (=0 (% X 72))  # 1 inch
              (zero I)
              (inc 'Step) ) ) )
     (page) ) )</lang>