Colour pinstripe/Printer

From Rosetta Code
Colour pinstripe/Printer
You are encouraged to solve this task according to the task description, using any language you may know.

The task is to create 1 point 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 point wide vertical for the next inch, and then 4 point 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).

Note that it is an acceptable solution to use the smallest marks that the language provides, rather than working at native printer resolution, where this is not achievable from within the language.

Optionally, on systems where the printer resolution cannot be determined, it is permissible to prompt the user for printer resolution, and to calculate point size based on user input, enabling fractional point sizes to be used.


This program first displays a Print Dialogue so the printer can be selected.

      PD_RETURNDC = 256
DIM pd{lStructSize%, hwndOwner%, hDevMode%, hDevNames%, \
\ hdc%, flags%, nFromPage{l&,h&}, nToPage{l&,h&}, \
\ nMinPage{l&,h&}, nMaxPage{l&,h&}, nCopies{l&,h&}, \
\ hInstance%, lCustData%, lpfnPrintHook%, lpfnSetupHook%, \
\ lpPrintTemplateName%, lpSetupTemplateName%, \
\ hPrintTemplate%, hSetupTemplate%}
pd.lStructSize% = DIM(pd{})
pd.hwndOwner% = @hwnd%
pd.flags% = PD_RETURNDC
SYS "PrintDlg", pd{} TO ok%
SYS "DeleteDC", @prthdc%
@prthdc% = pd.hdc%
*MARGINS 0,0,0,0
dx% = @vdu%[email protected]%!232
dy% = @vdu%[email protected]%!240
SYS "GetDeviceCaps", @prthdc%, _LOGPIXELSY TO dpi%
DIM rc{l%,t%,r%,b%}
DIM colour%(7)
colour%() = &000000, &0000FF, &00FF00, &FF0000, \
\ &FF00FF, &FFFF00, &00FFFF, &FFFFFF
VDU 2,1,32,3
pitch% = 1
FOR y% = 0 TO dy% STEP dpi%
col% = 0
FOR x% = 0 TO dx%-pitch% STEP pitch%
rc.l% = x% : rc.r% = x% + pitch%
rc.t% = y% : rc.b% = y% + dpi%
SYS "CreateSolidBrush", colour%(col% MOD 8) TO brush%
SYS "FillRect", @prthdc%, rc{}, brush%
SYS "DeleteObject", brush%
col% += 1
pitch% += 1
VDU 2,1,12,3


Library: Go Graphics

The code for this task is basically the same as for Colour_pinstripe/Display#Go except that the drawing parameters have been tweaked to produce 1 inch bands when printing on A4 paper and some code has been added to dump the image to the default printer.

package main
import (
var palette = [8]string{
"000000", // black
"FF0000", // red
"00FF00", // green
"0000FF", // blue
"FF00FF", // magenta
"00FFFF", // cyan
"FFFF00", // yellow
"FFFFFF", // white
func pinstripe(dc *gg.Context) {
w := dc.Width()
h := dc.Height() / 7
for b := 1; b <= 11; b++ {
for x, ci := 0, 0; x < w; x, ci = x+b, ci+1 {
y := h * (b - 1)
dc.DrawRectangle(float64(x), float64(y), float64(b), float64(h))
func main() {
dc := gg.NewContext(842, 595)
fileName := "color_pinstripe.png"
var cmd *exec.Cmd
if runtime.GOOS == "windows" {
cmd = exec.Command("mspaint", "/pt", fileName)
} else {
cmd = exec.Command("lp", fileName)
if err := cmd.Run(); err != nil {


See the print_cb function of Colour_pinstripe/Display#Phix and the final comments of that entry.


(load "@lib/ps.l")
# Using circular lists for an endless supply of colors
# (black red green blue magenta cyan yellow white)
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) ) )


The drawing code is exactly the same code as Colour_pinstripe/Display#Racket, only drawing onto a printer device context now.

#lang racket/gui
(define parts 4)
(define dc (new printer-dc%))
(send* dc (start-doc "Colour Pinstripe") (start-page))
(define-values [W H] (send dc get-size))
(define parts 4)
(define colors
'("Black" "Red" "Green" "Blue" "Magenta" "Cyan" "Yellow" "White"))
(send dc set-pen "black" 0 'transparent)
(send dc set-brush "black" 'solid)
(define H* (round (/ H parts)))
(for ([row parts])
(define Y (* row H*))
(for ([X (in-range 0 W (add1 row))] [c (in-cycle colors)])
(send dc set-brush c 'solid)
(send dc draw-rectangle X Y (add1 row) H*)))
(send* dc (end-page) (end-doc))


This code assumes that the page's printable area is 8.5"×11".

Library: Tk
package require Tk
# Allocate a temporary drawing surface
canvas .c
# The cycle of colors we want to use
set colors {black red green blue magenta cyan yellow white}
# Draw the output we want
for {set y 0;set dx 1} {$y < 11*72} {incr y 72;incr dx} {
for {set x 0;set c 0} {$x < 8.5*72} {incr x $dx;incr c} {
.c create rectangle $x $y [expr {$x+$dx+1}] [expr {$y+73}] \
-fill [lindex $colors [expr {$c%[llength $colors]}]] -outline {}
# Send postscript to default printer, scaled 1 pixel -> 1 point
exec lp - << [.c postscript -height $y -width $x -pageheight $y -pagewidth $x]
# Explicit exit; no GUI desired