⚠️ Warning: This is a draft ⚠️
This means it might contain formatting issues,
incorrect code, conceptual problems, or other severe issues.
If you want to help to improve and eventually enable this page,
please fork
RosettaGit's repository
and open a merge request on GitHub.
{{task}}[[Category:Test card]]
The task is to display a series of vertical greyscale bars (contrast bars) with a sufficient number of bars to span the entire width of the display.
For the top quarter of the display, the left hand bar should be black, and we then incrementally step through six shades of grey until we have a white bar on the right hand side of the display. (This gives a total of 8 bars)
For the second quarter down, we start with white and step down through 14 shades of gray, getting darker until we have black on the right hand side of the display. (This gives a total of 16 bars).
Halfway down the display, we start with black, and produce 32 bars, ending in white, and for the last quarter, we start with white and step through 62 shades of grey, before finally arriving at black in the bottom right hand corner, producing a total of 64 bars for the bottom quarter.
ActionScript
package
{
import flash.display.Sprite;
[SWF(width="640", height="480")]
public class GreyscaleBars extends Sprite
{
public function GreyscaleBars()
{
_drawRow(8, 0);
_drawRow(16, stage.stageHeight/4, true);
_drawRow(32, stage.stageHeight/2);
_drawRow(64, stage.stageHeight/4 * 3, true);
}
private function _drawRow(nbSteps : uint, startingY : uint, reverse : Boolean = false) : void {
for (var i : int = 0; i < nbSteps; i++) {
graphics.beginFill(0x00, reverse ? 1 - (i/nbSteps) : (i/nbSteps));
graphics.drawRect(i * stage.stageWidth / nbSteps, startingY, stage.stageWidth/nbSteps, stage.stageHeight/4);
graphics.endFill();
}
}
}
}
Ada
{{libheader|GTK}}
{{libheader|GtkAda}}
with Gtk.Window; use Gtk.Window;
with Gtk.Enums;
with Gtk.Handlers;
with Gtk.Main;
with Gdk;
with Gdk.Event;
with Glib; use Glib;
with Cairo; use Cairo;
with Gdk.Cairo;
pragma Elaborate_All (Gtk.Handlers);
procedure Greyscale is
Win : Gtk_Window;
Width : constant := 640;
Height : constant := 512;
package Handlers is new Gtk.Handlers.Callback (Gtk_Window_Record);
package Event_Cb is new Gtk.Handlers.Return_Callback (
Widget_Type => Gtk_Window_Record,
Return_Type => Boolean);
procedure Quit (Win : access Gtk_Window_Record'Class) is
pragma Warnings (Off, Win);
begin
Gtk.Main.Main_Quit;
end Quit;
function Expose
(Drawing : access Gtk_Window_Record'Class;
Event : Gdk.Event.Gdk_Event)
return Boolean
is
subtype Dub is Glib.Gdouble;
Cr : Cairo_Context;
Revert : Boolean;
Grey : Dub;
DH : constant Dub := Dub (Height) / 4.0;
X, Y, DW : Dub;
N : Natural;
begin
Cr := Gdk.Cairo.Create (Get_Window (Drawing));
for Row in 1 .. 4 loop
N := 2 ** (Row + 2);
Revert := (Row mod 2) = 0;
DW := Dub (Width) / Dub (N);
X := 0.0;
Y := DH * Dub (Row - 1);
for B in 0 .. (N - 1) loop
Grey := Dub (B) / Dub (N - 1);
if Revert then
Grey := 1.0 - Grey;
end if;
Cairo.Set_Source_Rgb (Cr, Grey, Grey, Grey);
Cairo.Rectangle (Cr, X, Y, DW, DH);
Cairo.Fill (Cr);
X := X + DW;
end loop;
end loop;
Cairo.Destroy (Cr);
return False;
end Expose;
begin
Gtk.Main.Set_Locale;
Gtk.Main.Init;
Gtk_New (Win);
Gtk.Window.Initialize (Win, Gtk.Enums.Window_Toplevel);
Set_Title (Win, "Greyscale with GTKAda");
Set_Default_Size (Win, Width, Height);
Set_App_Paintable (Win, True);
-- Attach handlers
Handlers.Connect (Win, "destroy", Handlers.To_Marshaller (Quit'Access));
Event_Cb.Connect
(Win,
"expose_event",
Event_Cb.To_Marshaller (Expose'Access));
Show_All (Win);
Gtk.Main.Main;
end Greyscale;
ANSI Standard BASIC
{{trans|BBC BASIC}}
100 SET WINDOW 0,1279,0,1023
110 REM (0,0) is the bottom left of the display
120 SET AREA COLOR 1 ! Select color one for drawing
130 FOR row=1 TO 4
140 LET n=IP(2^(row+2))
150 LET w=IP(1280/n)
160 LET py=IP(256*(4-row))
170 FOR b=0 TO n-1
180 LET g=b/(n-1)
190 IF n=16 OR n=64 THEN LET g=1-g
200 SET COLOR MIX(1) g,g,g ! Reprogram color 1 to the gray we want
210 PLOT AREA: w*b,py; w*b+w,py; w*b+w,py+256; w*b,py+256
220 NEXT b
230 NEXT row
240 END
AutoHotkey
Requires the GDI+ Standard Library by tic: http://www.autohotkey.com/forum/viewtopic.php?t=32238
h := A_ScreenHeight
w := A_ScreenWidth
pToken := gdip_Startup()
hdc := CreateCompatibleDC()
hbm := CreateDIBSection(w, h)
obm := SelectObject(hdc, hbm)
G := Gdip_GraphicsFromHDC(hdc)
OnExit, Exit
Gui +E0x80000 +LastFound +OwnDialogs +Owner +AlwaysOnTop
hwnd := WinExist()
Gui Show, NA
columnHeight := h/4
Loop 4
{
columnY := (A_Index-1) * columnHeight
columnCount := 2**(A_Index+2)
colorgap := 255 / (columnCount-1)
columnWidth := w/ColumnCount
If (A_Index & 1)
colorComp := 0
else
colorComp := 255
,colorgap *= -1
MsgBox % colorGap * columnCount
Loop % columnCount
{
columnX := (A_Index-1) * columnWidth
pBrush := Gdip_BrushCreateSolid(QColor(colorComp, colorComp, colorComp))
Gdip_FillRectangle(G, pBrush, columnX, columnY, columnWidth, columnHeight)
Gdip_DeleteBrush(pBrush)
colorComp += colorgap
}
SetFormat, IntegerFast, hex
SetFormat, IntegerFast, D
}
UpdateLayeredWindow(hwnd, hdc, 0, 0, W, H)
SelectObject(hdc, obm)
DeleteObject(hbm)
DeleteDC(hdc)
Gdip_DeleteGraphics(G)
Return
Esc::
Exit:
Gdip_Shutdown(pToken)
ExitApp
QColor(r, g, b){
return 0xFF000000 | (r << 16) | (g << 8) | (b)
}
BASIC256
h=ceil(graphheight/4)
for row=1 to 4
w=ceil(graphwidth/(8*row))
c=255/(8*row-1)
for n = 0 to (8*row-1)
color 255-c*n,255-c*n,255-c*n
if row/2 = int(row/2) then color c*n,c*n,c*n
rect n*w,h*(row-1),w,h
next n
next row
## BBC BASIC
```bbcbasic
MODE 8:REM 640 x 512 pixel display mode: BBC BASIC gives 2 graphics points per pixel
REM (0,0) is the bottom left of the display
GCOL 1 :REM Select colour one for drawing
FOR row%=1 TO 4
n%=2^(row%+2)
w%=1280/n%
py%=256*(4-row%)
FOR b%=0 TO n%-1
g%=255*b%/(n%-1)
IF n%=16 OR n%=64 THEN g%=255-g%
COLOUR 1,g%,g%,g% : REM Reprogram colour 1 to the grey we want
RECTANGLE FILL w%*b%,py%,w%,256
NEXT b%
NEXT row%
C
{{libheader|GTK}}
#include <gtk/gtk.h>
/* do some greyscale plotting */
void gsplot (cairo_t *cr,int x,int y,double s) {
cairo_set_source_rgb (cr,s,s,s);
cairo_move_to (cr,x+0.5,y);
cairo_rel_line_to (cr,0,1);
cairo_stroke (cr);
}
/* make a shaded widget */
gboolean expose_event (GtkWidget *widget,GdkEventExpose *event,gpointer data) {
int r,c,x=0;
cairo_t *cr;
cr = gdk_cairo_create (widget->window);
cairo_scale (cr,5,50);
cairo_set_line_width (cr,1);
for (r=0;r<4;r++) {
c = (r&1)*64-(r%2);
do gsplot (cr,x++%64,r,c/(1<<(3-r))/(8*(1<<r)-1.0));
while ((c+=2*!(r%2)-1)!=(!(r%2))*64-(r%2));
} cairo_destroy (cr);
return FALSE;
}
/* main */
int main (int argc, char *argv[]) {
GtkWidget *window;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (window, "expose-event",G_CALLBACK (expose_event), NULL);
g_signal_connect (window, "delete-event", G_CALLBACK(gtk_main_quit), NULL);
gtk_window_set_default_size (GTK_WINDOW(window), 320, 200);
gtk_widget_set_app_paintable (window, TRUE);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}
C#
{{libheader|System.Windows.Forms}}
using System;
using System.Drawing;
using System.Windows.Forms;
static class Program { static void Main() { Application.Run(new FullScreen()); } }
public sealed class FullScreen : Form
{
const int ColorCount = 256;
public FullScreen()
{
FormBorderStyle = FormBorderStyle.None;
WindowState = FormWindowState.Maximized;
KeyPress += (s, e) => Application.Exit();
BackgroundImage = ColorBars(Screen.FromControl(this).Bounds);
}
private static Bitmap ColorBars(Rectangle size)
{
var colorBars = new Bitmap(size.Width, size.Height);
Func<int, int, int> forwardColor = (x, divs) => (int)(x * ((float)divs / size.Width)) * ColorCount / divs;
Func<int, int, int> reverseColor = (x, divs) => ColorCount - 1 - forwardColor(x, divs);
Action<int, int, int> setGray = (x, y, gray) => colorBars.SetPixel(x, y, Color.FromArgb(gray, gray, gray));
Action<int, int, int> setForward = (x, y, divs) => setGray(x, y, forwardColor(x, divs));
Action<int, int, int> setReverse = (x, y, divs) => setGray(x, y, reverseColor(x, divs));
int verticalStripe = size.Height / 4;
for (int x = 0; x < size.Width; x++)
{
for (int y = 0; y < verticalStripe; y++) setForward(x, y, 8);
for (int y = verticalStripe; y < verticalStripe * 2; y++) setReverse(x, y, 16);
for (int y = verticalStripe * 2; y < verticalStripe * 3; y++) setForward(x, y, 32);
for (int y = verticalStripe * 3; y < verticalStripe * 4; y++) setReverse(x, y, 64);
}
return colorBars;
}
}
C++
using Qt 4.6
file greytones.h
```cpp
#ifndef MYWIDGET_H
#define MYWIDGET_H
#include
class QPaintEvent ;
class MyWidget : public QWidget {
public :
MyWidget( ) ;
protected :
void paintEvent( QPaintEvent * ) ;
} ;
#endif
```
```txt
file greytones.cpp
```
```cpp
#include
#include "greytones.h"
MyWidget::MyWidget( ) {
setGeometry( 0, 0 , 640 , 480 ) ;
}
void MyWidget::paintEvent ( QPaintEvent * ) {
QBrush myBrush( Qt::SolidPattern ) ;
QPainter myPaint( this ) ;
int run = 0 ; //how often have we run through the loop ?
int colorcomp = 0 ;
for ( int columncount = 8 ; columncount < 128 ; columncount *= 2 ) {
int colorgap = 255 / columncount ;
int columnwidth = 640 / columncount ; // 640 being the window width
int columnheight = 480 / 4 ; //we're looking at quarters
if ( run % 2 == 0 ) { //we start with black columns
colorcomp = 0 ;
}
else { //we start with white columns
colorcomp = 255 ;
colorgap *= -1 ; //we keep subtracting color values
}
int ystart = 0 + columnheight * run ; //determines the y coordinate of the first column per row
int xstart = 0 ;
for ( int i = 0 ; i < columncount ; i++ ) {
myBrush.setColor( QColor( colorcomp, colorcomp , colorcomp ) ) ;
myPaint.fillRect( xstart , ystart , columnwidth , columnheight , myBrush ) ;
xstart += columnwidth ;
colorcomp += colorgap ; //we choose the next color
}
run++ ;
}
}
```
file main.cpp
```cpp
#include
#include "greytones.h"
int main( int argc, char * argv[ ] ) {
QApplication app( argc , argv ) ;
MyWidget window ;
window.setWindowTitle( QApplication::translate( "greyScales" , "grey scales demonstration" ) ) ;
window.show( ) ;
return app.exec( ) ;
}
```
=={{Header|Component Pascal}}==
{{works with|Black Box Component Builder}}
[[File:GreyScaleCp.png|thumb|right]]
```oberon2
MODULE RosettaGreys;
IMPORT Views, Ports, Properties, Controllers, StdLog;
CONST
(* orient values *)
left = 1;
right = 0;
TYPE
View = POINTER TO RECORD
(Views.View)
END;
PROCEDURE LoadGreyPalette(VAR colors: ARRAY OF Ports.Color);
VAR
i, step, hue: INTEGER;
BEGIN
step := 255 DIV LEN(colors);
FOR i := 1 TO LEN(colors) DO
hue := i * step;
colors[i - 1] := Ports.RGBColor(hue,hue,hue)
END
END LoadGreyPalette;
PROCEDURE (v: View) Restore(f: Views.Frame; l, t, r, b: INTEGER);
VAR
i, w, h: INTEGER;
colors: POINTER TO ARRAY OF Ports.Color;
PROCEDURE Draw(row, cols: INTEGER; orient: INTEGER);
VAR
w: INTEGER;
c: Ports.Color;
BEGIN
NEW(colors,cols);LoadGreyPalette(colors^);
w := (r - l) DIV cols;
FOR i := 1 TO cols DO
IF orient = left THEN c := colors[cols - i] ELSE c := colors[i - 1] END;
f.DrawRect((l + w) * (i - 1), t + (row - 1) * h, (l + w) * i, t + row * h,Ports.fill,c);
END
END Draw;
BEGIN
h := (b - t) DIV 4;
Draw(1,8,right);
Draw(2,16,left);
Draw(3,32,right);
Draw(4,64,left);
END Restore;
PROCEDURE (v: View) HandlePropMsg(VAR msg: Properties.Message);
CONST
min = 5 * Ports.mm;
max = 50 * Ports.mm;
VAR
stdProp: Properties.StdProp;
prop: Properties.Property;
BEGIN
WITH msg: Properties.SizePref DO
IF (msg.w = Views.undefined) OR (msg.h = Views.undefined) THEN
msg.w := 100 * Ports.mm;
msg.h := 35 * Ports.mm
END
ELSE (* ignore other messages *)
END
END HandlePropMsg;
PROCEDURE Deposit*;
VAR
v: View;
BEGIN
NEW(v);
Views.Deposit(v)
END Deposit;
END RosettaGreys.
"RosettaGreys.Deposit; StdCmds.Open"
```
## EasyLang
[https://easylang.online/apps/run.html?bg=eee&code=n%20%3D%208%0Afor%20row%20range%204%0Asz%23%20%3D%20100%20/%20n%0Afor%20i%20range%20n%0Ac%23%20%3D%20i%20/%20%28n%20-%201%29%0Aif%20row%20mod%202%20%3D%201%0Ac%23%20%3D%201%20-%20c%23%0A.%0Acolor_red%20c%23%0Acolor_green%20c%23%0Acolor_blue%20c%23%0Amove%20sz%23%20%2A%20i%20row%20%2A%2025%0Arect%20sz%23%20%2B%201%2025%0A.%0An%20%3D%20n%20%2A%202%0A. Run it]
```easyprog.online
n = 8
for row range 4
sz# = 100 / n
for i range n
c# = i / (n - 1)
if row mod 2 = 1
c# = 1 - c#
.
color_red c#
color_green c#
color_blue c#
move sz# * i row * 25
rect sz# + 1 25
.
n = n * 2
.
```
## Euler Math Toolbox
```Euler Math Toolbox
>function grayscale(y1,y2,n,direction=1) ...
$ loop 0 to n-1;
$ s=#/(n-1); barcolor(rgb(s,s,s));
$ if direction==1 then plotbar(#/n,y1,1/n,y2-y1);
$ else plotbar(1-(#+1)/n,y1,1/n,y2-y1);
$ endif;
$ end;
$endfunction
>function grayscales () ...
$ aspect(2); barstyle("#");
$ window(0,0,1023,1023); margin(0); setplot(0,1,0,1);
$ clg;
$ hold on;
$ grayscale(3/4,1,8,1);
$ grayscale(1/2,3/4,14,-1);
$ grayscale(1/4,1/2,32,1);
$ grayscale(0,1/4,64,-1);
$ hold off;
$endfunction
>grayscales:
```
## FreeBASIC
```freebasic
' version 01-09-2017
' compile with: fbc -s console
' or compile with: fbc -s gui
' hit any key to stop
Dim As UInteger d, blocks, blocksize, ps, col, h, w, x, y1, y2
ScreenInfo w, h
' create display size window, 8bit color (palette), no frame
ScreenRes w, h, 8,, 8
For x = 0 To 255 ' create grayscale palette for
Palette x, x, x, x ' the window we just opened
Next
h = h \ 4 : y2 = h -1
If w Mod 64 <> 0 Then w -= (w Mod 64)
blocks = 8 : blocksize = w \ 8
For ps = 1 To 4
For x = 0 To blocks -1
col = 255 * x \ (blocks -1) ' from black to white
If (ps And 1) = 0 Then col = 255 - col ' from white to black
Line (x * blocksize, y1) - (((x +1) * blocksize) -1, y2), col, bf
Next
y1 += h : y2 += h
blocks *= 2 : blocksize \= 2
Next
' empty keyboard buffer
While Inkey <> "" : Wend
Sleep
End
```
## Frink
```frink
fakewidth =!= dummy
g = new graphics
g.antialiased[false]
drawBars[g, 0, 1, 0, 1/4, 8]
drawBars[g, 1, 0, 1/4, 1/2, 16]
drawBars[g, 0, 1, 1/2, 3/4, 32]
drawBars[g, 1, 0, 3/4, 1, 64]
g.show[640,480,1] // No portable fullscreen mode; user must maximize window.
drawBars[g is graphics, leftColor, rightColor, top, bottom, steps] :=
{
colorStep = (rightColor - leftColor) / steps
color = leftColor
for i=0 to steps-1
{
g.color[color, color, color]
g.fillRectSides[i/dummy/steps, top, (i+1)/dummy/steps, bottom]
color = color + colorStep
}
}
```
## Gambas
```gambas
Public Sub Form_Open()
Dim iRow, iCol, iClr As Integer 'For Row, Column and Colour
Dim iInc As Integer = 4 'To calculate RGB colour
Dim h1Panel As Panel 'Panels to display colours
With Me 'Setup the Form
.Arrangement = Arrange.Row 'Arrange children in rows
.Border = False 'No Border
.Height = Desktop.Height 'Fill the screen
.Width = Desktop.Width 'Fill the screen
.Fullscreen = True 'Set the Form to Fullscreen
End With
For iRow = 1 To 4 'For each row..
iInc += iInc 'Increase iInc by itself
For iCol = 0 To iInc - 1 'For each column..
iClr = iCol * (256 / iInc) 'Set the RGB colour
If iRow = 2 Or iRow = 4 Then iClr = 255 - (iCol * (256 / iInc)) 'If row 2 or 4 then reverse the colours
h1Panel = New Panel(Me) 'Create a new Panel
With h1Panel 'With the Panel..
.Width = Desktop.Width / iInc 'Set the width
.Height = Desktop.Height / 4 'Set the height
.Background = Color.RGB(iClr, iClr, iClr) 'Set the Background colour
.Border = Border.Plain 'Set a Border (It's easier to see the colour changes)
End With
Next
Next
End
```
'''[http://www.cogier.com/gambas/GreyScale.png Click here for image of the output]'''
## Go
{{libheader|Go Graphics}}
{{trans|Java}}
```go
package main
import (
"github.com/fogleman/gg"
"math"
)
func greyBars(dc *gg.Context) {
run := 0
colorComp := 0.0 // component of the color
for colCount := 8; colCount < 128; colCount *= 2 {
// by this gap we change the background color
colorGap := 255.0 / float64(colCount-1)
colWidth := float64(dc.Width() / colCount)
colHeight := float64(dc.Height() / 4)
// switches color directions with each iteration of for loop
if run%2 == 0 {
colorComp = 0.0
} else {
colorComp = 255.0
colorGap = -colorGap
}
xstart, ystart := 0.0, colHeight*float64(run)
for i := 0; i < colCount; i++ {
icolor := int(math.Round(colorComp)) // round to nearer integer
dc.SetRGB255(icolor, icolor, icolor)
dc.DrawRectangle(xstart, ystart, colWidth, colHeight)
dc.Fill()
xstart += colWidth
colorComp += colorGap
}
run++
}
}
func main() {
dc := gg.NewContext(640, 320)
greyBars(dc)
dc.SavePNG("greybars.png")
}
```
{{out}}
```txt
Image similar to R entry (first image)
```
## Haskell
This program uses an inlined XPM file which is scaled to fill an entire GTK fullscreen window
```Haskell
import Graphics.UI.Gtk
import Graphics.UI.Gtk.Gdk.GC
import Control.Monad.Trans (liftIO)
-- click on the window to exit.
main = do
initGUI
window <- windowNew
buf <- pixbufNewFromXPMData bars
widgetAddEvents window [ButtonPressMask]
on window objectDestroy mainQuit
on window exposeEvent (paint buf)
on window buttonPressEvent $
liftIO $ do { widgetDestroy window; return True }
windowFullscreen window
widgetShowAll window
mainGUI
paint :: Pixbuf -> EventM EExpose Bool
paint buf = do
pix <- eventWindow
liftIO $ do
(sx, sy) <- drawableGetSize pix
newBuf <- pixbufScaleSimple buf sx sy InterpNearest
gc <- gcNewWithValues pix newGCValues
drawPixbuf pix gc newBuf 0 0 0 0 (-1) (-1) RgbDitherNone 0 0
return True
bars :: [String]
bars = [
"64 4 65 1 1 1"," c None","A c #000000",
"C c #080808","D c #0C0C0C","E c #101010","F c #141414",
"G c #181818","H c #1C1C1C","I c #202020","J c #242424",
"K c #282828","L c #2C2C2C","M c #303030","N c #343434",
"O c #383838","P c #3C3C3C","Q c #404040","R c #444444",
"S c #484848","T c #4C4C4C","U c #505050","V c #545454",
"W c #585858","X c #5C5C5C","Y c #606060","Z c #646464",
"a c #686868","b c #6C6C6C","c c #707070","d c #747474",
"e c #787878","f c #7C7C7C","g c #808080","h c #848484",
"i c #888888","j c #8C8C8C","k c #909090","l c #949494",
"m c #989898","n c #9C9C9C","o c #A0A0A0","p c #A4A4A4",
"q c #A8A8A8","r c #ACACAC","s c #B0B0B0","t c #B4B4B4",
"u c #B8B8B8","v c #BCBCBC","w c #C0C0C0","x c #C4C4C4",
"y c #C8C8C8","z c #CCCCCC","0 c #D0D0D0","1 c #D4D4D4",
"2 c #D8D8D8","3 c #DCDCDC","4 c #E0E0E0","5 c #E4E4E4",
"6 c #E8E8E8","7 c #ECECEC","8 c #F0F0F0","9 c #F4F4F4",
". c #F8F8F8","+ c #FCFCFC","* c #FFFFFF",
"AAAAAAAAJJJJJJJJRRRRRRRRZZZZZZZZhhhhhhhhppppppppxxxxxxxx********",
"****88881111xxxxttttppppllllhhhhddddZZZZVVVVRRRRNNNNJJJJFFFFAAAA",
"AADDFFHHJJLLNNPPRRTTVVXXZZbbddffhhjjllnnpprrttvvxxzz11336688..**",
"*+.9876543210zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCA"
]
```
=={{header|Icon}} and {{header|Unicon}}==
This procedure uses code from the [[Colour_bars/Display|Colour bars/Display task]], specifically the: ''DrawTestCard'' procedure and ''testcard'', ''band'', and ''bar''
records which are used to build structures that can be easily transcribed into independent bands and bars.
[[File:Greyscale_unicon.png|thumb|right]]
```Icon
link graphics,printf,numbers
procedure main()
DrawTestCard(GreyScale_TestCard())
WDone()
end
procedure greyscale(l,h,s) #: generate s greys over range l:h
every i := round(l to h+1 by ((h-l)/(s-1.))) do
suspend sprintf("%d,%d,%d",i,i,i) # return rgb black-grey-white
end
procedure GreyScale_TestCard() #: return greyscale testcard
TC := testcard(,"GreyScale Test Card",
width := 800, height := 600,
list(numbands := 4) )
maxv := 2^16-1 # largest colour value
every (iv := [], i := 1 to numbands) do { # for each band
every put(v := [], greyscale(0,maxv,2^(2+i))) # compute greyscale
put(iv, if i%2 = 0 then v else reverse(v)) # switch directions
}
every r := height/numbands * ((i := 1 to numbands)-1) + 1 do {
TC.bands[i] := band(r,[])
every c := width/(*iv[i]) * ((j := 1 to *iv[i])-1) + 1 do
put(TC.bands[i].bars, bar( c, iv[i,j]))
put((TC.bands[i]).bars, bar(width)) # right sentinal
}
put(TC.bands,band(height)) # bottom sentinal
return TC
end
```
{{libheader|Icon Programming Library}}
[http://www.cs.arizona.edu/icon/library/src/procs/graphics.icn graphics.icn supports graphics]
[http://www.cs.arizona.edu/icon/library/src/procs/printf.icn printf.icn provides sprintf, etc.]
[http://www.cs.arizona.edu/icon/library/src/procs/numbers.icn numbers.icn provides round]
## J
'''Solution:'''
```j
load 'viewmat'
size=. 2{.".wd'qm' NB. J6
size=. getscreenwh_jgtk_ '' NB. J7
rows=. (2^3+i.4),._1^i.4
bars=. ((64%{.)#[:(<:@|%~i.)*/)"1 rows
togreyscale=. (256#. [:<.255 255 255&*)"0
'rgb' viewmat (4<.@%~{:size)# (64<.@%~{.size)#"1 togreyscale bars
```
Note that this solution is not posted directly to the screen but to a viewmat window, which may not be centered.
## Java
using basically the same code as in the C++ example
```Java
import javax.swing.* ;
import java.awt.* ;
public class Greybars extends JFrame {
private int width ;
private int height ;
public Greybars( ) {
super( "grey bars example!" ) ;
width = 640 ;
height = 320 ;
setSize( width , height ) ;
setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ) ;
setVisible( true ) ;
}
public void paint ( Graphics g ) {
int run = 0 ;
double colorcomp = 0.0 ; //component of the color
for ( int columncount = 8 ; columncount < 128 ; columncount *= 2 ) {
double colorgap = 255.0 / (columncount - 1) ; //by this gap we change the background color
int columnwidth = width / columncount ;
int columnheight = height / 4 ;
if ( run % 2 == 0 ) //switches color directions with every for loop
colorcomp = 0.0 ;
else {
colorcomp = 255.0 ;
colorgap *= -1.0 ;
}
int ystart = 0 + columnheight * run ;
int xstart = 0 ;
for ( int i = 0 ; i < columncount ; i++ ) {
int icolor = (int)Math.round(colorcomp) ; //round to nearer integer
Color nextColor = new Color( icolor , icolor, icolor ) ;
g.setColor( nextColor ) ;
g.fillRect( xstart , ystart , columnwidth , columnheight ) ;
xstart += columnwidth ;
colorcomp += colorgap ;
}
run++ ;
}
}
public static void main( String[ ] args ) {
Greybars gb = new Greybars( ) ;
}
}
```
## JavaScript
Live Demo: http://jsfiddle.net/gcN9g/embedded/result/
```JavaScript>
var width = 640; var height = 400;
var c = document.createElement("canvas");
c.setAttribute('id', 'myCanvas');
c.setAttribute('style', 'border:1px solid black;');
c.setAttribute('width', width);
c.setAttribute('height', height);
document.body.appendChild(c);
var ctx = document.getElementById('myCanvas').getContext("2d");
var columnCount = 8; // number of columns
var rowCount = 4; // number of rows
var direction = 1; // 1 = from left to right, 0 = from right to left
var blackLeft = 1; // black is left: 1 = true, 0 = false
for(var j = 0; j < rowCount; j++){
for(var i = 0; i < columnCount; i++){
ctx.fillStyle = 'rgba(0,0,0,'+ (blackLeft-(1/(columnCount-1)*i))*direction +')';
ctx.fillRect(
(width/columnCount)*i,(height/rowCount)*j,
(width/columnCount),(height/rowCount)
);
}
columnCount *= 2;
direction *= -1;
blackLeft = blackLeft ? 0 : 1;
}
```
## Julia
```Julia
using Gtk, Cairo, ColorTypes
function generategrays(n, screenwidth)
verts = Vector{RGB}()
hwidth = Int(ceil(screenwidth/n))
for x in 00:Int(floor(0xff/(n-1))):0xff
rgbgray = RGB(x/255, x/255, x/255)
for i in 1:hwidth
push!(verts, rgbgray)
end
end
verts
end
function drawline(ctx, p1, p2, color, width)
move_to(ctx, p1.x, p1.y)
set_source(ctx, color)
line_to(ctx, p2.x, p2.y)
set_line_width(ctx, width)
stroke(ctx)
end
const can = @GtkCanvas()
const win = GtkWindow(can, "Grayscale bars/Display", 400, 400)
fullscreen(win) # start full screen, then reduce to regular window in 5 seconds.
draw(can) do widget
ctx = getgc(can)
h = height(can)
w = width(can)
gpoints = generategrays(8, w)
for (i, x) in enumerate(0:w-1)
drawline(ctx, Point(x, 0.25*h), Point(x, 0), gpoints[i], 1)
end
gpoints = reverse(generategrays(16, w))
for (i, x) in enumerate(0:w-1)
drawline(ctx, Point(x, 0.5*h), Point(x, 0.25*h), gpoints[i], 1)
end
gpoints = generategrays(32, w)
for (i, x) in enumerate(0:w-1)
drawline(ctx, Point(x, 0.75*h), Point(x, 0.5*h), gpoints[i], 1)
end
gpoints = reverse(generategrays(64, w))
for (i, x) in enumerate(0:w-1)
drawline(ctx, Point(x, h), Point(x, 0.75*h), gpoints[i], 1)
end
end
show(can)
sleep(5)
unfullscreen(win)
const cond = Condition()
endit(w) = notify(cond)
signal_connect(endit, win, :destroy)
wait(cond)
```
## Kotlin
{{trans|Java}}
```scala
// version 1.1
import java.awt.Color
import java.awt.Graphics
import javax.swing.JFrame
class GreyBars : JFrame("grey bars example!") {
private val w: Int
private val h: Int
init {
w = 640
h = 320
setSize(w, h)
defaultCloseOperation = JFrame.EXIT_ON_CLOSE
isVisible = true
}
override fun paint(g: Graphics) {
var run = 0
var colorComp: Double // component of the color
var columnCount = 8
while (columnCount < 128) {
var colorGap = 255.0 / (columnCount - 1) // by this gap we change the background color
val columnWidth = w / columnCount
val columnHeight = h / 4
if (run % 2 == 0) // switches color directions with each iteration of while loop
colorComp = 0.0
else {
colorComp = 255.0
colorGap *= -1.0
}
val ystart = columnHeight * run
var xstart = 0
for (i in 0 until columnCount) {
val iColor = Math.round(colorComp).toInt()
val nextColor = Color(iColor, iColor, iColor)
g.color = nextColor
g.fillRect(xstart, ystart, columnWidth, columnHeight)
xstart += columnWidth
colorComp += colorGap
}
run++
columnCount *= 2
}
}
}
fun main(args: Array) {
GreyBars()
}
```
## Liberty BASIC
Black boxes were added around each color for ease of counting the boxes.
```lb
nomainwin
WindowWidth =DisplayWidth
WindowHeight =DisplayHeight
open "Grey bars" for graphics_fs_nsb as #w
#w "trapclose [quit]"
#w "down"
bars =4 ' alter for more, finer bars.
for group =0 to bars -1
for i = 0 to 2^( 3 +group) -1
#w "place "; WindowWidth *i /( 2^( 3 +group)); " "; WindowHeight *group /bars
if ( group =0) or ( group =2) then
g$ =str$( int( 255 *i /(2^( 3 +group)-1)))
else
g$ =str$( 255 -int( 255 *i /(2^( 3 +group)-1)))
end if
grey$ =g$ +" " +g$ +" " +g$
#w "backcolor "; grey$
'#w "color "; grey$ 'rem out for outlined areas..
#w "boxfilled "; WindowWidth *( i +1) /8 ; " "; WindowHeight *( group +1) /bars
next i
next group
wait
[quit]
close #w
end
```
Resulting [http://www.diga.me.uk/greyscale.gif GreyScale image] without the outlines.
=={{header|Mathematica}} / {{header|Wolfram Language}}==
```mathematica
CreateDocument[ Graphics[ Flatten@Table[
{ If[EvenQ[#3], GrayLevel[ 1. - j/#1 ], GrayLevel[ j/#1 ]],
Rectangle[{j #2, 7*#3}, {#2 (j + 1), (#3 + 1) 7}]}, {j, 0, #1}] & @@@
{{7, 8, 3}, {15, 4, 2}, {31, 2, 1}, {63, 1, 0} }
,ImageSize -> Full], WindowFrame -> "Frameless", WindowSize -> Full]
```
[[File:greyscales.jpg|thumb|right]]
## MAXScript
3ds max provides customizable maps like gradient to the user, but you can also write it:
```MAXScript
fn drawBarRow _bmp _row _width _number _inverse=
(
local dir = if _inverse then 1 else -1
if not _inverse then
(
setpixels _bmp [0,_row] (for i in 1 to (_width/_number) collect (black))
for i = (_width/_number) to _width by (_width/_number) do
(
local loopPosition = i/(_width-(_width/_number)) as float
local colorsArr = for c in 1 to (_width/_number) collect (white*loopPosition)
setpixels _bmp [i,_row] colorsArr
)
return _bmp
)
else
(
setpixels _bmp [0,_row] (for i in 1 to (_width/_number) collect (white))
for i = _width to (_width/_number) by ((_width/_number)*-1) do
(
local loopPosition = 1.0-(i/(_width-(_width/_number))) as float
local colorsArr = for c in 1 to (_width/_number) collect (white*loopPosition)
setpixels _bmp [i,_row] colorsArr
)
return _bmp
)
)
fn bitmap_verticalBars =
(
local width = (sysinfo.desktopsize).x
local height = (sysinfo.desktopsize).y
local theBitmap = bitmap width height color:white
local row = 0
while row <= (height-1) do
(
local barNumber = 0
case of
(
(row < (height/4)): (barNumber = 1)
(row >= (height/4) and row < (height/2)): (barNumber = 2)
(row >= (height/2) and row < (height-(height/4))): (barNumber = 3)
(row >= (height-(height/4))): (barNumber = 4)
default: return theBitmap
)
case barNumber of
(
1: (
theBitmap = drawBarRow theBitmap row width 8 false
)
2: (
theBitmap = drawBarRow theBitmap row width 16 true
)
3: (
theBitmap = drawBarRow theBitmap row width 32 false
)
4: (
theBitmap = drawBarRow theBitmap row width 64 true
)
)
row += 1
--
)
return theBitmap
)
b = bitmap_verticalBars()
display b
```
## OCaml
```ocaml
open Graphics
let round x = truncate (floor (x +. 0.5))
let () =
open_graph "";
let width = size_x ()
and height = size_y () in
let bars = [| 8; 16; 32; 64 |] in
let n = Array.length bars in
Array.iteri (fun i bar ->
let part = float width /. float bar in
let y = (height / n) * (n - i - 1) in
for j = 0 to pred bar do
let x = round (float j *. part) in
let v = round (float j *. 255. /. float (bar - 1)) in
let v = if (i mod 2) = 0 then v else 255 - v in
set_color (rgb v v v);
fill_rect x y (round part) (height / n)
done
) bars;
ignore(read_key())
```
Run with:
```txt
$ ocaml graphics.cma greyscale_bars.ml
```
## Perl
```perl
sub partition {
my($all, $div) = @_;
my @marks = 0;
push @marks, $_/$div * $all for 1..$div;
my @copy = @marks;
$marks[$_] -= $copy[$_-1] for 1..$#marks;
@marks[1..$#marks];
}
sub bars {
my($h,$w,$p,$rev) = @_;
my (@nums,@vals,$line,$d);
$d = 2**$p;
push @nums, int $_/($d-1) * (2**16-1) for $rev ? reverse 0..$d-1 : 0..$d-1;
push @vals, ($nums[$_]) x (partition($w, $d))[$_] for 0..$#nums;
$line = join(' ', @vals) . "\n";
$line x $h;
}
my($w,$h) = (1280,768);
open my $pgm, '>', 'Greyscale-bars-perl5.pgm' or die "Can't create Greyscale-bars-perl5.pgm: $!";
print $pgm <<"EOH";
P2
# Greyscale-bars-perl5.pgm
$w $h
65535
EOH
my ($h1,$h2,$h3,$h4) = partition($h,4);
print $pgm
bars($h1,$w,3,0),
bars($h2,$w,4,1),
bars($h3,$w,5,0),
bars($h4,$w,6,1);
```
[https://github.com/SqrtNegInf/Rosettacode-Perl5-Smoke/blob/master/ref/Greyscale-bars-perl5.png See Greyscale-bars-perl5] (offsite image)
## Perl 6
```perl6
my ($width,$height) = 1280,768;
my $PGM = open "Greyscale-bars-perl6.pgm", :w orelse die "Can't create Greyscale-bars-perl6.pgm: $_";
$PGM.print: qq:to/EOH/;
P2
# Greyscale-bars-perl6.pgm
$width $height
65535
EOH
my ($h1,$h2,$h3,$h4) = divvy($height,4);
my @nums = ((0/7,1/7...7/7) X* 65535)».floor;
my $line = ~(@nums Zxx divvy($width,8));
$PGM.say: $line for ^$h1;
@nums = ((15/15,14/15...0/15) X* 65535)».floor;
$line = ~(@nums Zxx divvy($width,16));
$PGM.say: $line for ^$h2;
@nums = ((0/31,1/31...31/31) X* 65535)».floor;
$line = ~(@nums Zxx divvy($width,32));
$PGM.say: $line for ^$h3;
@nums = ((63/63,62/63...0/63) X* 65535)».floor;
$line = ~(@nums Zxx divvy($width,64));
$PGM.say: $line for ^$h4;
$PGM.close;
sub divvy($all, $div) {
my @marks = ((1/$div,2/$div ... 1) X* $all)».round;
@marks Z- 0,|@marks;
}
```
[https://github.com/SqrtNegInf/Rosettacode-Perl6-Smoke/blob/master/ref/Greyscale-bars-perl6.png See Greyscale-bars-perl6] (offsite image)
## Phix
Resizeable. Use of nx avoids rounding/misalignment errors
{{libheader|pGUI}}
```Phix
--
-- demo\rosetta\Greyscale_bars.exw
--
include pGUI.e
Ihandle dlg, canvas
cdCanvas cddbuffer, cdcanvas
function redraw_cb(Ihandle /*ih*/, integer /*posx*/, integer /*posy*/)
cdCanvasActivate(cddbuffer)
integer {width, height} = IupGetIntInt(canvas, "DRAWSIZE")
integer h = ceil(height/4)
for row=1 to 4 do
integer x = 0, p2 = power(2,row+2), c = floor(255/(p2-1))
for n=0 to p2-1 do
integer colour = c*n*#010101
if and_bits(row,1)=0 then colour = xor_bits(colour,#FFFFFF) end if
cdCanvasSetForeground(cddbuffer, colour)
integer nx = ceil(width*(n+1)/p2)
cdCanvasBox(cddbuffer, x, nx, height-h, height)
x = nx
end for
height -= h
end for
cdCanvasFlush(cddbuffer)
return IUP_DEFAULT
end function
function map_cb(Ihandle ih)
cdcanvas = cdCreateCanvas(CD_IUP, ih)
cddbuffer = cdCreateCanvas(CD_DBUFFER, cdcanvas)
return IUP_DEFAULT
end function
function unmap_cb(Ihandle /*ih*/)
cdKillCanvas(cddbuffer)
cdKillCanvas(cdcanvas)
return IUP_DEFAULT
end function
function esc_close(Ihandle /*ih*/, atom c)
if c=K_ESC then return IUP_CLOSE end if
return IUP_CONTINUE
end function
procedure main()
IupOpen()
canvas = IupCanvas(NULL)
IupSetAttribute(canvas, "RASTERSIZE", "600x400")
IupSetCallback(canvas, "MAP_CB", Icallback("map_cb"))
IupSetCallback(canvas, "UNMAP_CB", Icallback("unmap_cb"))
dlg = IupDialog(canvas)
IupSetAttribute(dlg, "TITLE", "Greyscale bars")
IupSetCallback(canvas, "ACTION", Icallback("redraw_cb"))
IupSetCallback(dlg, "K_ANY", Icallback("esc_close"))
IupMap(dlg)
IupSetAttribute(canvas, "RASTERSIZE", NULL)
IupShowXY(dlg,IUP_CENTER,IUP_CENTER)
IupMainLoop()
IupClose()
end procedure
main()
```
## PicoLisp
```PicoLisp
(let Pgm # Create PGM of 384 x 288 pixels
(make
(for N 4
(let L
(make
(for I (* N 8)
(let C (*/ (dec I) 255 (dec (* N 8)))
(unless (bit? 1 N)
(setq C (- 255 C)) )
(do (/ 48 N) (link C)) ) ) )
(do 72 (link L)) ) ) )
(out '(display) # Pipe to ImageMagick
(prinl "P5") # NetPBM format
(prinl (length (car Pgm)) " " (length Pgm))
(prinl 255)
(for Y Pgm (apply wr Y)) ) )
```
## PureBasic
```PureBasic
If Not InitKeyboard(): End: EndIf ;can't init keyboard
If Not InitSprite(): End: EndIf ;can't init sprite/screen library
If Not ExamineDesktops(): End: EndIf ;can't retrieve information about desktop
Define height.f, width.f, depth
height.f = DesktopHeight(0)
width.f = DesktopWidth(0)
depth = DesktopDepth(0)
If OpenScreen(width, height, depth, "Press ENTER to exit")
Define vsCount, v, h, columns, columnWidth, endColor, shade
StartDrawing(ScreenOutput())
vsCount = 4
For v = 0 To 3
columns = (v + 1) * 8
columnWidth = Round(width / columns, #PB_Round_Up)
endColor = $FFFFFF * (v % 2) ;alternate between black and white for first and last bar
Box(0, (height * v) / vsCount, columnWidth, height / vsCount, endColor)
For h = 1 To columns - 2
If v % 2 = 0
shade = 256 / columns * (h + 1)
Else
shade = 256 / columns * (columns - (h + 1))
EndIf
Box((width * h) / columns, (height * v) / vsCount, columnWidth, height / vsCount, RGB(shade, shade, shade))
Next
Box((width * (columns - 1)) / columns, (height * v) / vsCount, columnWidth, height / vsCount, $FFFFFF - endColor)
Next
StopDrawing()
FlipBuffers()
Repeat
Delay(10)
ExamineKeyboard()
Until KeyboardPushed(#PB_Key_Escape) Or KeyboardPushed(#PB_Key_Return)
CloseScreen()
EndIf
```
Press Enter or Escape to exit the programs's display.
## Python
{{libheader|livewires}}
```Python
#!/usr/bin/env python
#four gray scaled stripes 8:16:32:64 in Python 2.7.1
from livewires import *
horiz=640; vert=480; pruh=vert/4; dpp=255.0
begin_graphics(width=horiz,height=vert,title="Gray stripes",background=Colour.black)
def ty_pruhy(each):
hiy=each[0]*pruh; loy=hiy-pruh
krok=horiz/each[1]; piecol=255.0/(each[1]-1)
for x in xrange(0,each[1]):
barva=Colour(piecol*x/dpp,piecol*x/dpp,piecol*x/dpp ); set_colour(barva)
if each[2]:
box(x*krok,hiy,x*krok+krok,loy,filled=1)
else:
box(horiz-x*krok,hiy,horiz-((x+1)*krok),loy,filled=1)
# main
source=[[4,8,True],[3,16,False],[2,32,True],[1,64,False]]
for each in source:
ty_pruhy(each)
while keys_pressed() != [' ']: # press spacebar to close window
pass
```
## R
Create a 4x64 matrix representing the described pattern, set margins to 0 so the image will fill the display, and plot the matrix in grayscale using the "image" function:
[[File:GrayscalesR.png|thumb|right]]
```R
mat <- matrix(c(rep(1:8, each = 8) / 8,
rep(16:1, each = 4) / 16,
rep(1:32, each = 2) / 32,
rep(64:1, each = 1) / 64),
nrow = 4, byrow = TRUE)
par(mar = rep(0, 4))
image(t(mat[4:1, ]), col = gray(1:64/64), axes = FALSE)
```
Or, this can be generalized with the function below, which produces the pattern for an arbitrary number of rows (though rows become visibly indistinguishable after about row 5):
[[File:GrayscalesR-6.png|thumb|right]]
```R
grayscalesImage <- function(nrow = 4) {
X <- matrix(NA, nrow = nrow, ncol = 2^(nrow + 2))
for (i in 1:nrow) {
X[i, ] <- rep(1:2^(i + 2), each = 2^(nrow - i)) / 2^(i + 2)
if (i %% 2 == 0) X[i, ] <- rev(X[i, ])
}
par(mar = rep(0, 4))
image(t(X[nrow:1, ]), col = gray(1:ncol(X) / ncol(X)), axes = FALSE)
}
## Example ##
grayscalesImage(6) # produces image shown in screenshot to the right
```
## Racket
This solution uses the built-in pict library for graphics.
[[File:Grayscale-pict.png|thumb|right]]
```racket
#lang racket/gui
(require slideshow/pict)
(define-values (*width* *height*) (values 400 40))
(define (shades inc)
(for/list ([scale (in-range 0 (+ 1 inc) inc)])
(round (* 255 scale))))
(define (grays increment direction)
(define colors (shades increment))
(apply hc-append
((if (eq? direction 'right) identity reverse)
(for/list ([c colors])
(colorize (filled-rectangle
(/ *width* (length colors)) *height*)
(make-color c c c))))))
(vc-append (grays 1/8 'right) (grays 1/16 'left)
(grays 1/32 'right) (grays 1/64 'left))
```
## RapidQ
```vb
Declare Sub PaintCanvas
Create Form as Qform
Caption = "Rosetta Greyscale"
Center
create Canv as QCanvas
align = 5
onPaint = PaintCanvas
end create
end create
Sub PaintCanvas
NumRows = 4 'Change for number of rows
for curbar = 0 to NumRows-1
Bars = 2^(curbar+3)
for x = 0 to (Bars -1)
x1=Canv.Width/Bars*x
y1=Canv.Height/NumRows*CurBar
x2=Canv.Width/Bars*(x+1)
y2=Canv.Height/NumRows*(CurBar+1)
c=(255/(Bars-1))*x
c=iif(curbar mod 2, 255-c, c)
Canv.FillRect(x1, y1, x2, y2, rgb(c, c, c))
next x
next curbar
end sub
Form.showmodal
```
## Ring
```ring
# Project : Greyscale bars/Display
load "guilib.ring"
paint = null
new qapp
{
win1 = new qwidget() {
setwindowtitle("Greyscale bars/Display")
setgeometry(100,100,500,600)
label1 = new qlabel(win1) {
setgeometry(10,10,400,400)
settext("")
}
new qpushbutton(win1) {
setgeometry(150,500,100,30)
settext("draw")
setclickevent("draw()")
}
show()
}
exec()
}
func draw
p1 = new qpicture()
color = new qcolor() {
setrgb(0,0,255,255)
}
pen = new qpen() {
setcolor(color)
setwidth(1)
}
paint = new qpainter() {
begin(p1)
setpen(pen)
for row=1 to 4
n=pow(2,(row+2))
w=1280/n
py=256*(4-row)
for b=0 to n-1
g=floor(255*b/(n-1))
if n=16 or n=64
g=255-g
ok
color2 = new qcolor()
color2.setrgb(g,g,g,255)
mybrush = new qbrush() {setstyle(1) setcolor(color2)}
paint.setbrush(mybrush)
paint.drawrect(w*b,py,w,256)
next
next
endpaint()
}
label1 { setpicture(p1) show() }
```
Output:
https://www.dropbox.com/s/01iywg04iwubf55/GreyscaleBars.jpg?dl=0
## Run BASIC
```Runbasic
for i = 1 to 4
incr = int(256 / (i * 8))
c = 256
html ""
for j = 1 to i * 8
html " | "
c = c - incr
next j
html "
"
next i
html "
"
end
```
```txt
Run in a browser
```
## Scala
```scala
import scala.swing._
class GreyscaleBars extends Component {
override def paintComponent(g:Graphics2D)={
val barHeight=size.height>>2
for(run <- 0 to 3; colCount=8<