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.
BBC BASIC
This program first displays a Print Dialogue so the printer can be selected. <lang bbcbasic> PD_RETURNDC = 256
_LOGPIXELSY = 90
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%
IF ok%=0 THEN QUIT
SYS "DeleteDC", @prthdc%
@prthdc% = pd.hdc%
*MARGINS 0,0,0,0
dx% = @vdu%!236-@vdu%!232
dy% = @vdu%!244-@vdu%!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
NEXT
pitch% += 1
NEXT y%
VDU 2,1,12,3</lang>
Go
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.
<lang go>package main
import (
"github.com/fogleman/gg" "log" "os/exec" "runtime"
)
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 {
dc.SetHexColor(palette[ci%8])
y := h * (b - 1)
dc.DrawRectangle(float64(x), float64(y), float64(b), float64(h))
dc.Fill()
}
}
}
func main() {
dc := gg.NewContext(842, 595)
pinstripe(dc)
fileName := "color_pinstripe.png"
dc.SavePNG(fileName)
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 {
log.Fatal(err)
}
}</lang>
Julia
<lang Julia> using Colors, FileIO
const colors = [colorant"black", colorant"red", colorant"green", colorant"blue",
colorant"magenta", colorant"cyan", colorant"yellow", colorant"white"]
function getnumberwithprompt(prompt, t::Type)
s = ""
while (x = tryparse(t, s)) == nothing
print("\n", prompt, ": -> ")
s = strip(readline())
end
return x
end
function colorstripepng(filename)
dpi = getnumberwithprompt("Printer DPI (dots per inch)", Int)
pwidth, plength = getnumberwithprompt("Printer width (inches)", Float64), 10
imgwidth, imgheight = Int(round(pwidth * dpi)), plength * dpi
img = fill(colorant"black", imgheight, imgwidth)
for row in 1:imgheight
stripenum, stripewidth, colorindex = 1, div(row, dpi) + 1, 1
for col in 1:imgwidth
img[row, col] = colors[colorindex]
if (stripenum += 1) % stripewidth == 0
colorindex = mod1(colorindex + 1, length(colors))
end
end
end
save(filename, img)
end
colorstripepng("temp.png") run(`print temp.png`) # the run statement may need to be set up for the installed device </lang>
Nim
The code for drawing is the same that in the task Colour_pinstripe/Display but the context is different. We have chosen to display a dialog to give the user a way to choose the destination (which may be a printer or a file). Instead of the “draw” signal, we have to process the “begin_print” signal to set the number of pages and the “draw_page” signal to render the page.
<lang Nim>import gintro/[glib, gobject, gtk, gio, cairo]
const Colors = [[0.0, 0.0, 0.0], [255.0, 0.0, 0.0],
[0.0, 255.0, 0.0], [0.0, 0.0, 255.0],
[255.0, 0.0, 255.0], [0.0, 255.0, 255.0],
[255.0, 255.0, 0.0], [255.0, 255.0, 255.0]]
- ---------------------------------------------------------------------------------------------------
proc beginPrint(op: PrintOperation; printContext: PrintContext; data: pointer) =
## Process signal "begin_print", that is set the number of pages to print. op.setNPages(1)
- ---------------------------------------------------------------------------------------------------
proc drawPage(op: PrintOperation; printContext: PrintContext; pageNum: int; data: pointer) =
## Draw a page.
let context = printContext.getCairoContext() let lineHeight = printContext.height / 4
var y = 0.0
for lineWidth in [1.0, 2.0, 3.0, 4.0]:
context.setLineWidth(lineWidth)
var x = 0.0
var colorIndex = 0
while x < printContext.width:
context.setSource(Colors[colorIndex])
context.moveTo(x, y)
context.lineTo(x, y + lineHeight)
context.stroke()
colorIndex = (colorIndex + 1) mod Colors.len
x += lineWidth
y += lineHeight
- ---------------------------------------------------------------------------------------------------
proc activate(app: Application) =
## Activate the application.
# Launch a print operation.
let op = newPrintOperation()
op.connect("begin_print", beginPrint, pointer(nil))
op.connect("draw_page", drawPage, pointer(nil))
# Run the print dialog. discard op.run(printDialog)
- ———————————————————————————————————————————————————————————————————————————————————————————————————
let app = newApplication(Application, "Rosetta.ColorPinstripe") discard app.connect("activate", activate) discard app.run()</lang>
Phix
See the print_cb function of Colour_pinstripe/Display#Phix and the final comments of that entry.
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>
Python
<lang Python> from turtle import * from PIL import Image import time import subprocess
"""
Only works on Windows. Assumes that you have Ghostscript installed and in your path.
https://www.ghostscript.com/download/gsdnld.html
Hard coded to 100 pixels per inch.
"""
colors = ["black", "red", "green", "blue", "magenta", "cyan", "yellow", "white"]
screen = getscreen()
- width and height in pixels
- aspect ratio for 11 by 8.5 paper
inch_width = 11.0 inch_height = 8.5
pixels_per_inch = 100
pix_width = int(inch_width*pixels_per_inch) pix_height = int(inch_height*pixels_per_inch)
screen.setup (width=pix_width, height=pix_height, startx=0, starty=0)
screen.screensize(pix_width,pix_height)
- center is 0,0
- get coordinates of the edges
left_edge = -screen.window_width()//2
right_edge = screen.window_width()//2
bottom_edge = -screen.window_height()//2
top_edge = screen.window_height()//2
- draw quickly
screen.delay(0) screen.tracer(5)
for inch in range(int(inch_width)-1):
line_width = inch + 1 pensize(line_width) colornum = 0
min_x = left_edge + (inch * pixels_per_inch)
max_x = left_edge + ((inch+1) * pixels_per_inch)
for y in range(bottom_edge,top_edge,line_width):
penup()
pencolor(colors[colornum])
colornum = (colornum + 1) % len(colors)
setposition(min_x,y)
pendown()
setposition(max_x,y)
screen.getcanvas().postscript(file="striped.eps")
- convert to jpeg
- won't work without Ghostscript.
im = Image.open("striped.eps") im.save("striped.jpg")
- Got idea from http://rosettacode.org/wiki/Colour_pinstripe/Printer#Go
subprocess.run(["mspaint", "/pt", "striped.jpg"]) </lang>
Racket
The drawing code is exactly the same code as Colour_pinstripe/Display#Racket, only drawing onto a printer device context now.
<lang Racket>
- 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)) </lang>
Raku
(formerly Perl 6)
Note that Raku does not attempt to be a printer driver. This example allows users to specify the dpi and paper size, then generates an image and passes it to the default printer. Defaults to 300 dpi and US letter paper.
<lang perl6>unit sub MAIN ($dpi = 300, $size = 'letter');
my $filename = './Color-pinstripe-printer-perl6.png';
my %paper = (
'letter' => { :width(8.5), :height(11.0) }
'A4' => { :width(8.2677), :height(11.6929)}
);
my ($w, $h) = %paper{$size}<width height> »*» $dpi;
- ROYGBIVK
my @color = (1,0,0),(1,.598,0),(1,1,0),(0,1,0),(0,0,1),(.294,0,.51),(.58,0,.827),(0,0,0);
my $gap = floor $w % ($dpi * +@color) / 2;
my $rows = (1, * * 2 … * > $dpi).elems;
my $height = $dpi;
use Cairo;
my @colors = @color.map: { Cairo::Pattern::Solid.new.create(|$_) };
given Cairo::Image.create(Cairo::FORMAT_ARGB32, $w, $h) -> $image {
given Cairo::Context.new($image) {
my Cairo::Pattern::Solid $bg .= create(1,1,1);
.rectangle(0, 0, $w, $h);
.pattern($bg);
.fill;
$bg.destroy;
my $y = $gap;
for ^$rows -> $row {
my $x = $gap;
my $width = $dpi / (2 ** $row);
for @colors -> $this {
my $v = 0;
while $v++ < (2 ** ($row - 1)) {
given Cairo::Context.new($image) -> $block {
$block.rectangle($x, $y, $width, $height);
$block.pattern($this);
$block.fill;
$block.destroy;
}
$x += $width;
$x += $width if $row;
}
}
$y += $height;
}
}
$image.write_png($filename);
}
- Uncomment next line if you actually want to print it
- run('lp', $filename)</lang>
See Color-pinstripe-printer-perl6.png (offsite png image)
Tcl
This code assumes that the page's printable area is 8.5"×11".
<lang tcl>package require Tk
- Allocate a temporary drawing surface
canvas .c
- The cycle of colors we want to use
set colors {black red green blue magenta cyan yellow white}
- Draw the output we want
for {set y 0;set dx 1} {$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
exit</lang>
Wren
This reuses the plug-in from the Pinstripe/Printer#Wren task to enable DOME to print to the default printer.
<lang ecmascript>import "graphics" for Canvas, Color, ImageData
import "dome" for Window
import "plugin" for Plugin
Plugin.load("printer")
import "printer" for Printer
class Main {
construct new() {
Window.title = "Color pinstripe - printer"
_width = 842
_height = 595
Canvas.resize(_width, _height)
Window.resize(_width, _height)
var colors = [
Color.hex("000000"), // black
Color.hex("FF0000"), // red
Color.hex("00FF00"), // green
Color.hex("0000FF"), // blue
Color.hex("FF00FF"), // magenta
Color.hex("00FFFF"), // cyan
Color.hex("FFFF00"), // yellow
Color.hex("FFFFFF") // white
]
pinstripe(colors)
}
pinstripe(colors) {
var w = _width
var h = (_height/7).floor
for (b in 1..11) {
var x = 0
var ci = 0
while (x < w) {
var y = h * (b - 1)
Canvas.rectfill(x, y, b, h, colors[ci%8])
x = x + b
ci = ci + 1
}
}
}
init() {
var img = ImageData.create("color_pinstripe", _width, _height)
for (x in 0..._width) {
for (y in 0..._height) img.pset(x, y, Canvas.pget(x, y))
}
img.saveToFile("color_pinstripe.png")
Printer.printFile("color_pinstripe.png")
}
update() {}
draw(alpha) {}
}
var Game = Main.new()</lang>