Colour bars/Display: Difference between revisions
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=={{header|BASIC}}== |
=={{header|BASIC}}== |
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==={{header|AmigaBASIC}}=== |
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<lang amigabasic>SCREEN 1,320,200,5,1 |
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WINDOW 2,"Color bars",(0,10)-(297,186),15,1 |
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FOR a=0 TO 300 |
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LINE (a,0)-(a,186),(a+10)/10 |
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NEXT |
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loop: GOTO loop</lang> |
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==={{header|Applesoft BASIC}}=== |
==={{header|Applesoft BASIC}}=== |
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Revision as of 21:30, 19 November 2020
You are encouraged to solve this task according to the task description, using any language you may know.
- Task
Display a series of vertical color bars across the width of the display.
The color bars should either use:
- the system palette, or
- the sequence of colors:
- black
- red
- green
- blue
- magenta
- cyan
- yellow
- white
ActionScript
<lang ActionScript3> package {
import flash.display.Sprite; import flash.events.Event;
public class ColourBars extends Sprite {
public function ColourBars():void {
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(e:Event = null):void {
var colours:Array = [ 0x000000, 0xFF0000, 0x00FF00, 0x0000FF, 0xFF00FF, 0x00FFFF, 0xFFFF00, 0xFFFFFF ];
var w:Number = stage.stageWidth / 8, h:Number = stage.stageHeight;
var x:Number = 0, i:uint, c:uint;
for ( i = 0; i < 8; i++ ) {
c = colours[i];
graphics.beginFill(c);
graphics.drawRect(w * i, 0, w, h);
}
}
}
} </lang>
Ada
<lang Ada>with SDL.Video.Windows.Makers; with SDL.Video.Renderers.Makers; with SDL.Video.Palettes; with SDL.Events.Events; with SDL.Events.Keyboards;
procedure Colour_Bars_Display is
use type SDL.Events.Event_Types; use SDL.C;
Colours : constant array (0 .. 7) of SDL.Video.Palettes.Colour :=
((0, 0, 0, 255), (255, 0, 0, 255),
(0, 255, 0, 255), (0, 0, 255, 255),
(255, 0, 255, 255), (0, 255, 255, 255),
(255, 255, 0, 255), (255, 255, 255, 255));
Window : SDL.Video.Windows.Window;
Renderer : SDL.Video.Renderers.Renderer;
Event : SDL.Events.Events.Events;
Bar_Width : int;
begin
if not SDL.Initialise (Flags => SDL.Enable_Screen) then
return;
end if;
SDL.Video.Windows.Makers.Create (Win => Window,
Title => "",
Position => SDL.Natural_Coordinates'(0, 0),
Size => SDL.Positive_Sizes'(0, 0),
Flags => SDL.Video.Windows.Full_Screen_Desktop);
SDL.Video.Renderers.Makers.Create (Renderer, Window.Get_Surface);
Bar_Width := Window.Get_Size.Width / 8;
for A in Colours'Range loop
Renderer.Set_Draw_Colour (Colour => Colours (A));
Renderer.Fill (Rectangle => (X => SDL.C.int (A) * Bar_Width, Y => 0,
Width => Bar_Width,
Height => Window.Get_Size.Height));
end loop;
Window.Update_Surface;
Wait_Loop : loop
while SDL.Events.Events.Poll (Event) loop
exit Wait_Loop when Event.Common.Event_Type = SDL.Events.Keyboards.Key_Down;
end loop;
delay 0.050;
end loop Wait_Loop;
Window.Finalize;
SDL.Finalise;
end Colour_Bars_Display;</lang>
AutoHotkey
(available at http://www.autohotkey.net/~tic/Gdip.ahk)
<lang AutoHotkey>#SingleInstance, Force
- NoEnv
SetBatchLines, -1
- Uncomment if Gdip.ahk is not in your standard library
- Include, Gdip.ahk
- Start gdi+
If !pToken := Gdip_Startup() {
message =
( LTrim
gdiplus error!, Gdiplus failed to start.
Please ensure you have gdiplus on your system.
)
MsgBox, 48, %message%
ExitApp
} OnExit, Exit
- Set the width and height we want as our drawing area, to draw everything in.
- This will be the dimensions of our bitmap
Width := A_ScreenWidth, Height := A_ScreenHeight
- Create a layered window
- (+E0x80000
- must be used for UpdateLayeredWindow to work!)
- that is always on top (+AlwaysOnTop), has no taskbar entry or caption
Gui, 1: -Caption +E0x80000 +LastFound +OwnDialogs +Owner +AlwaysOnTop
- Show the window
Gui, 1: Show, NA
- Get a handle to this window we have created in order to update it later
hwnd1 := WinExist()
- Create a gdi bitmap with width and height of what we are going to
- draw into it. This is the entire drawing area for everything
hbm := CreateDIBSection(Width, Height)
- Get a device context compatible with the screen
hdc := CreateCompatibleDC()
- Select the bitmap into the device context
obm := SelectObject(hdc, hbm)
- Get a pointer to the graphics of the bitmap, for use with drawing functions
G := Gdip_GraphicsFromHDC(hdc)
- ARGB = Transparency, Red, Green, Blue
Colors := "0xFF000000,0xFFFF0000,0xFF00FF00,0xFF0000FF" Colors .= ",0xFFFF00FF,0xFF00FFFF,0xFFFFFF00,0xFFFFFFFF"
- This list ^ is Black, Red, Green, Blue, Magenta, Cyan, Yellow, White
StringSplit Colors, Colors, `, w := Width // Colors0 Loop % Colors0 {
; Create a brush to draw a rectangle pBrush := Gdip_BrushCreateSolid(Colors%A_Index%) ; Fill the graphics of the bitmap with a rectangle using the brush created Gdip_FillRectangle(G, pBrush, w*(A_Index-1), 0, w, height) ; Delete the brush as it is no longer needed and wastes memory Gdip_DeleteBrush(pBrush)
}
- Update the specified window we have created (hwnd1) with a handle to our
- bitmap (hdc), specifying the x,y,w,h we want it positioned on our screen
- So this will position our gui at (0,0) with the Width and
- Height specified earlier
UpdateLayeredWindow(hwnd1, hdc, 0, 0, Width, Height)
- Select the object back into the hdc
SelectObject(hdc, obm)
- Now the bitmap may be deleted
DeleteObject(hbm)
- Also the device context related to the bitmap may be deleted
DeleteDC(hdc)
- The graphics may now be deleted
Gdip_DeleteGraphics(G) Return
GuiEscape: Exit:
- gdi+ may now be shutdown on exiting the program
Gdip_Shutdown(pToken) ExitApp Return</lang>
AWK
<lang awk> BEGIN {
nrcolors = 8
for (height=0; height<20; height++) {
for (width=0; width<nrcolors; width++) {
# print (ANSI) basic color and amount of spaces
printf("\033[%dm%*s", width + 40, 64 / nrcolors, " ")
}
# reset color and print newline
printf("\033[0m\n")
}
} </lang>
BASIC
AmigaBASIC
<lang amigabasic>SCREEN 1,320,200,5,1 WINDOW 2,"Color bars",(0,10)-(297,186),15,1 FOR a=0 TO 300
LINE (a,0)-(a,186),(a+10)/10
NEXT loop: GOTO loop</lang>
Applesoft BASIC
<lang ApplesoftBasic>1 DATA1,12,6,3,14,13,15 2 HOME : GR : FOR I = 1 TO 7 3 READ C(I) : NEXT 4 FOR I = 0 TO 39 5 COLOR= C(I / 5) 6 VLIN 0,39 AT I : NEXT</lang>
BBC BASIC
<lang bbcbasic> SW_MAXIMIZE = 3
SYS "ShowWindow", @hwnd%, SW_MAXIMIZE
VDU 26
W% = @vdu%!208 / 4
H% = @vdu%!212 * 2
COLOUR 1,9
COLOUR 2,10
COLOUR 3,12
COLOUR 4,13
COLOUR 5,14
COLOUR 6,11
COLOUR 7,15
FOR C% = 0 TO 7
GCOL C%
RECTANGLE FILL C%*W%, 0, W%, H%
NEXT
</lang>
Commodore BASIC
This task achieved only on Commodore computers with color capabilities. The example below tested as-is in VICE on the following machines:
- Commodore 64
- Commodore 128
- Commodore Plus 4
- Commodore CBM-II (with VIC-II video)
- Commodore SX-64
It will also work well on the VIC-20 if you either omit line 310 or comment (REM) it out as the VIC-20 has only an eight-color palette.
This cross-compatibility is achieved by using the PETSCII control codes (CHR$(x)) for changing color, which are generally the same across all platforms, although the system palettes themselves may differ. This is combined with printing a "reverse video" space (solid block) character in the color selected.
<lang gwbasic>5 REM COLOR BARS PROGRAM 10 PRINT CHR$(147);:DIM CO(17):C=1 20 READ CO(C):IF CO(C)>0 THEN C=C+1:GOTO 20 25 SP$=" ":H=22:C=C-1:REM SP$=5 SPACES 30 FOR R=1 TO C STEP INT(C/2) 40 FOR H=1 TO 10 50 FOR B=R TO (R+INT(C/2))-1 60 PRINT CHR$(18);CHR$(CO(B));SP$; 70 NEXT B 75 REM CHECK IF PALETTE IS ONLY 8 (VIC-20). 76 REM IF SO, WE NEED TO FILL THE LAST TWO SPACES. 80 IF C<=8 THEN PRINT " "; 90 NEXT H:NEXT R 100 GET K$:IF K$="" THEN 100 110 END 280 REM BECAUSE THE CONTROL CODES FOR COLOR ARE NON-SEQUENTIAL, 285 REM WE PUT THEM INTO A SEQUENTIAL ARRAY FOR USE 300 DATA 144,5,28,159,156,30,31,158 305 REM OMIT OR REM THE NEXT LINE FOR VIC-20 310 DATA 129,149,150,151,152,153,154,155 320 DATA 0:REM DATA TERMINATOR</lang>
Liberty BASIC
<lang lb>nomainwin colors$="black red green blue pink cyan yellow white" WindowWidth=DisplayWidth:WindowHeight=DisplayHeight UpperLeftX=1:UpperLeftY=1 barWidth=DisplayWidth/8 graphicbox #main.g, 0,0,DisplayWidth,DisplayHeight open "" for window_popup as #main
- main "trapclose [quit]"
- main.g "down; setfocus; when characterInput [quit]"
- main.g "when leftButtonUp [quit]"
- main.g "size ";barWidth
for x = barWidth/2 to DisplayWidth step barWidth
i=i+1 if i>8 then i=1 col$=word$(colors$,i) #main.g "color ";col$;"; line ";x;" 0 ";x;" ";DisplayHeight
next wait [quit] close #main:end
</lang>
Locomotive Basic
Show the default MODE 0 palette (includes two blinking colors at the end):
<lang locobasic>10 MODE 0:BORDER 23 20 FOR x=0 TO 15 30 ORIGIN x*40,0 40 FOR z=0 TO 39 STEP 4:MOVE z,0:DRAW z,400,x:NEXT z 50 NEXT x 60 CALL &bb06 ' wait for key press</lang>
PureBasic
Press Enter or Escape to exit the program. <lang PureBasic>Dim color(7) color(0) = RGB($00, $00, $00) ;black color(1) = RGB($FF, $00, $00) ;red color(2) = RGB($00, $FF, $00) ;green color(3) = RGB($00, $00, $FF) ;blue color(4) = RGB($FF, $00, $FF) ;magenta color(5) = RGB($00, $FF, $FF) ;cyan color(6) = RGB($FF, $FF, $00) ;yellow color(7) = RGB($FF, $FF, $FF) ;white
If Not InitKeyboard(): End: EndIf ;can't init keyboard If Not InitSprite(): End: EndIf ;can't init sprite/screen library If Not ExamineDesktops(): End: EndIf ;can't retrieve information about desktop
height = DesktopHeight(0) width = DesktopWidth(0) depth = DesktopDepth(0) If OpenScreen(width, height, depth, "Press ENTER to exit")
StartDrawing(ScreenOutput())
For c = 0 To 7
Box((width * c) / 8, 0, width / 8, height, color(c))
Next
StopDrawing()
FlipBuffers()
Repeat Delay(10) ExamineKeyboard() Until KeyboardPushed(#PB_Key_Escape) Or KeyboardPushed(#PB_Key_Return) CloseScreen()
EndIf</lang>
Alternate method using console
<lang PureBasic>DataSection
;Black, Red, Green, Blue, Magenta, Cyan, Yellow, White Data.i 0, 12, 10, 9, 13, 11, 14, 15
EndDataSection
Dim colors(7) For c = 0 To 7
Read.i colors(c)
Next
If OpenConsole()
;The console display is 80 columns wide by 25 rows
For r = 0 To 24
For c = 0 To 7
ConsoleColor(colors(c), colors(c))
Print(Space(80 / 8))
Next
Next
EnableGraphicalConsole(1)
ConsoleLocate(0, 0)
ConsoleTitle("Press ENTER to exit"): Input()
CloseConsole()
EndIf</lang>
Run BASIC
<lang runbasic>colors$ = "black,red,green,blue,magenta,cyan,yellow,white"
html "
" for i = 1 to 8 html "<td width=20 bgcolor='";word$(colors$,i,",");"'" next i html ""</lang>
Output
TI Basic
<LANG>100 REM SMPTE Format Color Bars 110 REM with 400 Hz reference tone 120 CALL CLEAR 130 CALL SCREEN(2) 140 CALL COLOR(8,15,1) 150 CALL COLOR(9,11,1) 160 CALL COLOR(10,8,1) 170 CALL COLOR(11,13,1) 180 CALL COLOR(12,14,1) 190 CALL COLOR(13,10,1) 200 CALL COLOR(14,5,1) 210 CALL COLOR(15,2,1) 220 CALL COLOR(16,16,1) 230 GOSUB 510 240 REM color bars 250 CALL VCHAR(1,3,88,96) 260 CALL VCHAR(1,7,96,96) 270 CALL VCHAR(1,11,104,96) 280 CALL VCHAR(1,15,112,96) 290 CALL VCHAR(1,19,120,96) 300 CALL VCHAR(1,23,128,96) 310 CALL VCHAR(1,27,136,96) 320 REM BLACK BAR 330 CALL HCHAR(19,1,144,224) 340 REM WHITE BOX 350 FOR I=19 TO 24 360 CALL HCHAR(I,8,152,6) 370 NEXT I 410 REM SMPTE Complementary boxes 420 CALL HCHAR(18,3,136,4) 430 CALL HCHAR(18,7,144,4) 440 CALL HCHAR(18,11,120,4) 450 CALL HCHAR(18,15,144,4) 460 CALL HCHAR(18,19,104,4) 470 CALL HCHAR(18,23,144,4) 480 CALL HCHAR(18,27,88,4) 490 CALL SOUND(3000,400,12) 500 GOTO 490 510 SQUARE$="FFFFFFFFFFFFFFFF" 520 FOR I = 88 TO 152 STEP 8 530 CALL CHAR(I,SQUARE$) 540 NEXT I 590 RETURN </LANG>
ZX Spectrum Basic
<lang zxbasic>10 REM The ZX Spectrum display is 32 columns wide, so we have 8 columns of 4 spaces 20 FOR r=0 TO 20: REM There are 21 rows 30 FOR c=0 TO 7: REM We use the native colour sequence here 40 PAPER c: REM set the background colour for the spaces to be printed 50 PRINT " ";: REM four spaces, the semicolon prevents newline 60 NEXT c 70 REM at this point the cursor has wrapped, so we don't need a newline 80 NEXT r</lang>
Befunge
Assuming a terminal with support for ANSI escape sequences, this fills the screen with the colour sequence: black, red, green, blue, magenta, cyan, yellow and white. It then waits for the user to press Enter before terminating. <lang befunge><v%"P": <<*"(2" v_:"P"/"["39*,, :55+/68v v,,,";1H" ,+*86%+55 ,+*< 73654210v,,\,,,*93"[4m"< >$:55+%#v_:1-"P"%55+/3g^ 39*,,,~@>48*,1-:#v_$"m["</lang>
C
This task requires functionality which allows the code to communicate to the video device. This will vary from vendor to vendor. The following examples show two ways of doing this, in the text and graphics mode, using Borland's Turbo C.
Text Mode
The required functions and structures are in conio.h <lang C>
- include<conio.h>
- define COLOURS 8
int main() { int colour=0,i,j,MAXROW,MAXCOL; struct text_info tInfo; gettextinfo(&tInfo); MAXROW = tInfo.screenheight; MAXCOL = tInfo.screenwidth; textbackground(BLACK); //8 colour constants are defined clrscr();
for(colour=0;colour<COLOURS;colour++) { getch(); //waits for a key hit gotoxy(1+colour*MAXCOL/COLOURS,1); textbackground(colour); for(j=0;j<MAXROW;j++){ for(i=0;i<MAXCOL/COLOURS;i++){ cprintf(" "); } gotoxy(1+colour*MAXCOL/COLOURS,1+j); } }
getch(); textbackground(BLACK);
return 0; } </lang>
Graphics Mode
The required functions and structures are in graphics.h, conio.h is included for getch(). <lang C>
- include<graphics.h>
- include<conio.h>
int main() { int d=DETECT,m,maxX,maxY,maxColours,i; initgraph(&d,&m,"c:/turboc3/bgi"); maxX = getmaxx(); maxY = getmaxy(); maxColours = getmaxcolor();
for(i=0;i<maxColours;i++) { setfillstyle(SOLID_FILL,i); bar(i*maxX/maxColours,0,(i+1)*maxX/maxColours,maxY); }
getch(); closegraph();
return 0; } </lang>
C++
using Qt 4.6
file colorbars.h:
<lang cpp>#ifndef MYWIDGET_H
- define MYWIDGET_H
- include <QWidget>
class QPaintEvent ;
class MyWidget : public QWidget { public :
MyWidget( ) ;
protected :
void paintEvent( QPaintEvent * ) ;
private :
int width ; int height ; const int colornumber ;
} ;
- endif</lang>
file colorbars.cpp:
<lang cpp>#include <QtGui>
- include "colorbars.h"
MyWidget::MyWidget( ) :
width( 640 ) ,
height( 240 ) ,
colornumber( 8 ) {
setGeometry( 0, 0 , width , height ) ;
}
void MyWidget::paintEvent ( QPaintEvent * ) {
int rgbtriplets[ ] = { 0 , 0 , 0 , 255 , 0 , 0 , 0 , 255 , 0 ,
0 , 0 , 255 , 255 , 0 , 255 , 0 , 255 , 255 , 255 , 255 , 0 ,
255 , 255 , 255 } ;
QPainter myPaint( this ) ;
int rectwidth = width / colornumber ; //width of one rectangle
int xstart = 1 ; //x coordinate of the first rectangle
int offset = -1 ; //to allow for ++offset to define the red value even in the first run of the loop below
for ( int i = 0 ; i < colornumber ; i++ ) {
QColor rectColor ;
rectColor.setRed( rgbtriplets[ ++offset ] ) ;
rectColor.setGreen( rgbtriplets[ ++offset ] ) ;
rectColor.setBlue( rgbtriplets[ ++offset ] ) ;
myPaint.fillRect( xstart , 0 , rectwidth , height - 1 , rectColor ) ;
xstart += rectwidth + 1 ;
}
}</lang>
file main.cpp:
<lang cpp>#include <QApplication>
- include "colorbars.h"
int main( int argc, char * argv[ ] ) {
QApplication app( argc , argv ) ; MyWidget window ; window.setWindowTitle( QApplication::translate( "colorslides" , "color slides demonstration" ) ) ; window.show( ) ; return app.exec( ) ;
}</lang>
COBOL
<lang cobol> IDENTIFICATION DIVISION.
PROGRAM-ID. terminal-colour-bars.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 width PIC 9(3).
01 height PIC 9(3).
01 interval PIC 9(3).
01 colours-area.
03 colour-values.
05 FILLER PIC 9 VALUE 0. *> Black
05 FILLER PIC 9 VALUE 4. *> Red
05 FILLER PIC 9 VALUE 2. *> Green
05 FILLER PIC 9 VALUE 1. *> Blue
05 FILLER PIC 9 VALUE 5. *> Magneta
05 FILLER PIC 9 VALUE 3. *> Cyan
05 FILLER PIC 9 VALUE 6. *> Yellow
05 FILLER PIC 9 VALUE 7. *> White
03 colour-table REDEFINES colour-values.
05 colours PIC 9 OCCURS 8 TIMES INDEXED BY colour-index.
01 i PIC 9(3).
01 j PIC 9(3).
PROCEDURE DIVISION.
ACCEPT width FROM COLUMNS
ACCEPT height FROM LINES
DIVIDE width BY 8 GIVING interval
PERFORM VARYING i FROM 1 BY 1 UNTIL height < i
PERFORM VARYING j FROM 1 BY 1 UNTIL width < j
COMPUTE colour-index = (j / interval) + 1
IF 8 < colour-index
SET colour-index TO 8
END-IF
*> Some colours come a bit darker than they
*> should, with the yellow being orange and the white
*> being light-grey.
DISPLAY SPACE AT LINE i COLUMN j
WITH BACKGROUND-COLOR colours (colour-index)
END-PERFORM
END-PERFORM
ACCEPT i *> Prevent ncurses returning to console immediately.
GOBACK
.</lang>
Common Lisp
ncurses
To interface the ncurses C library from Lisp, the croatoan library is used. <lang lisp>(defun color-bars ()
(with-screen (scr :input-blocking t :input-echoing nil :cursor-visible nil)
(dotimes (i (height scr))
(move scr i 0)
(dolist (color '(:red :green :yellow :blue :magenta :cyan :white :black))
(add-char scr #\space :bgcolor color :n (floor (/ (width scr) 8)))))
(refresh scr)
;; wait for keypress
(get-char scr)))</lang>
Delphi
<lang Delphi> unit Colour_barsDisplay;
interface
uses
Winapi.Windows, System.SysUtils, System.Classes, Vcl.Graphics, Vcl.Forms;
type
TfmColourBar = class(TForm)
procedure FormPaint(Sender: TObject);
procedure FormResize(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
fmColourBar: TfmColourBar; Colors: array of TColor = [clblack, clred, clgreen, clblue, clFuchsia, clAqua, clyellow, clwhite];
implementation
{$R *.dfm}
procedure TfmColourBar.FormPaint(Sender: TObject); var
w, h, i: Integer; r: TRect;
begin
w := ClientWidth div length(Colors); h := ClientHeight; r := Rect(0, 0, w, h);
with Canvas do
for i := 0 to High(Colors) do
begin
Brush.Color := Colors[i];
FillRect(r);
r.Offset(w, 0);
end;
end;
procedure TfmColourBar.FormResize(Sender: TObject); begin
Invalidate;
end; end.</lang> Form resource: <lang Delphi> object fmColourBar: TfmColourBar
Caption = 'fmColourBar' OldCreateOrder = False OnPaint = FormPaint OnResize = FormResize
end </lang>
EasyLang
<lang easyprog.online>col[] = [ 000 900 090 909 099 990 999 ] w = 100.0 / len col[] for i range len col[]
color col[i] move w * i 0 rect w 100
.</lang>
Factor
<lang factor>USING: accessors colors.constants kernel math sequences ui ui.gadgets ui.gadgets.tracks ui.pens.solid ; IN: rosetta-code.colour-bars-display
- colors ( -- ) [
horizontal <track> {
COLOR: black COLOR: red COLOR: green COLOR: blue COLOR: magenta COLOR: cyan COLOR: yellow COLOR: white
} [ <solid> gadget new swap >>interior ] map dup length recip [ track-add ] curry each { 640 480 } >>pref-dim "bars" open-window ] with-ui ; MAIN: colors</lang>
Forth
This program extends ANS Forth to control the TMS9918 Video display processor in the TI-99 computer.
The color bars are shown in Society of Motion Picture and Television Engineers (SMPTE) order.
<lang CAMEL99 Forth> \ Color Bars for TI-99 CAMEL99 Forth
NEEDS HCHAR FROM DSK1.GRAFIX \ TMS9918 control lexicon NEEDS CHARSET FROM DSK1.CHARSET \ restores default character data NEEDS ENUM FROM DSK1.ENUM \ add simple enumerator to Forth
\ Name TI-99 colors 1 ENUM CLR ENUM BLK ENUM MGRN ENUM LGRN
ENUM BLU ENUM LBLU ENUM RED ENUM CYAN ENUM MRED ENUM LRED ENUM YEL ENUM LYEL ENUM GRN ENUM MAG ENUM GRY ENUM WHT
DROP
\ square character data HEX CREATE SQUARE FFFF , FFFF , FFFF , FFFF ,
DECIMAL
- COLOR-BARS ( -- )
24 0 DO
\ col row char wid \ --- --- ---- ---
2 I 88 4 HCHAR
6 I 96 4 HCHAR
10 I 104 4 HCHAR
14 I 112 4 HCHAR
18 I 120 4 HCHAR
22 I 128 4 HCHAR
26 I 136 4 HCHAR
LOOP ;
DECIMAL
- DEFCHARS ( pattern first last -- )
1+ SWAP ?DO DUP I CHARDEF 8 +LOOP DROP ;
- SET-COLORS ( -- )
\ charset fg bg \ ------- -- --
88 SET# GRY CLR COLOR 96 SET# YEL CLR COLOR 104 SET# CYAN CLR COLOR 112 SET# GRN CLR COLOR 120 SET# MAG CLR COLOR 128 SET# RED CLR COLOR 136 SET# BLU CLR COLOR 144 SET# BLK CLR COLOR ;
\ restore characters and colors
- DEFAULTS
8 SCREEN 4 19 BLK CLR COLORS CLEAR CHARSET ;
- BARS
CLEAR BLK SCREEN SET-COLORS SQUARE 88 152 DEFCHARS COLOR-BARS BEGIN ?TERMINAL UNTIL DEFAULTS
CR .( Done. Type BARS to run) </LANG>
FreeBASIC
<lang freebasic>' FB 1.05.0 Win64
' Draw the color bars on an 80 x 25 console using the system palette of 16 colors ' i.e. 5 columns per color Width 80, 25 Shell "cls" Locate ,, 0 turn cursor off For clr As UInteger = 0 To 15
Color 0, clr For row As Integer = 1 to 25 Locate row, clr * 5 + 1 Print Space(5); Next row
Next clr
Sleep ' restore default settings Locate ,, 1 turn cursor on Color 7, 0 white text on black background</lang>
Gambas
<lang gambas>Public Sub Form_Open() Dim iColour As Integer[] = [Color.Black, Color.red, Color.Green, Color.Magenta, Color.Cyan, Color.Yellow, Color.white] Dim hPanel As Panel Dim siCount As Short
With Me
.Arrangement = Arrange.Horizontal .Height = 300 .Width = 400
End With
For siCount = 0 To 6
hpanel = New Panel(Me) hpanel.Expand = True hpanel.H = 500 HPanel.Background = iColour[siCount]
Next
End</lang>
Go
<lang go>package main
import "github.com/fogleman/gg"
var colors = [8]string{
"000000", // black "FF0000", // red "00FF00", // green "0000FF", // blue "FF00FF", // magenta "00FFFF", // cyan "FFFF00", // yellow "FFFFFF", // white
}
func drawBars(dc *gg.Context) {
w := float64(dc.Width() / len(colors))
h := float64(dc.Height())
for i := range colors {
dc.SetHexColor(colors[i])
dc.DrawRectangle(w*float64(i), 0, w, h)
dc.Fill()
}
}
func main() {
dc := gg.NewContext(400, 400)
drawBars(dc)
dc.SavePNG("color_bars.png")
}</lang>
- Output:
Image similar to R entry.
Haskell
Terminal-based version.
<lang haskell>#!/usr/bin/env stack -- stack --resolver lts-7.0 --install-ghc runghc --package vty -- -threaded
import Graphics.Vty
colorBars :: Int -> [(Int, Attr)] -> Image colorBars h bars = horizCat $ map colorBar bars
where colorBar (w, attr) = charFill attr ' ' w h
barWidths :: Int -> Int -> [Int] barWidths nBars totalWidth = map barWidth [0..nBars-1]
where fracWidth = fromIntegral totalWidth / fromIntegral nBars
barWidth n =
let n' = fromIntegral n :: Double
in floor ((n' + 1) * fracWidth) - floor (n' * fracWidth)
barImage :: Int -> Int -> Image barImage w h = colorBars h $ zip (barWidths nBars w) attrs
where attrs = map color2attr colors
nBars = length colors
colors = [black, brightRed, brightGreen, brightMagenta, brightCyan, brightYellow, brightWhite]
color2attr c = Attr Default Default (SetTo c)
main = do
cfg <- standardIOConfig
vty <- mkVty cfg
let output = outputIface vty
bounds <- displayBounds output
let showBars (w,h) = do
let img = barImage w h
pic = picForImage img
update vty pic
e <- nextEvent vty
case e of
EvResize w' h' -> showBars (w',h')
_ -> return ()
showBars bounds
shutdown vty</lang>
Graphical version using SFML.
<lang haskell>-- Before you can install the SFML Haskell library, you need to install -- the CSFML C library. (For example, "brew install csfml" on OS X.)
-- This program runs in fullscreen mode. -- Press any key or mouse button to exit.
import Control.Exception import SFML.Graphics import SFML.SFResource import SFML.Window hiding (width, height)
withResource :: SFResource a => IO a -> (a -> IO b) -> IO b withResource acquire = bracket acquire destroy
withResources :: SFResource a => IO [a] -> ([a] -> IO b) -> IO b withResources acquire = bracket acquire (mapM_ destroy)
colors :: [Color] colors = [black, red, green, magenta, cyan, yellow, white]
makeBar :: (Float, Float) -> (Color, Int) -> IO RectangleShape makeBar (barWidth, height) (c, i) = do
bar <- err $ createRectangleShape setPosition bar $ Vec2f (fromIntegral i * barWidth) 0 setSize bar $ Vec2f barWidth height setFillColor bar c return bar
barSize :: VideoMode -> (Float, Float) barSize (VideoMode w h _ ) = ( fromIntegral w / fromIntegral (length colors)
, fromIntegral h )
loop :: RenderWindow -> [RectangleShape] -> IO () loop wnd bars = do
mapM_ (\x -> drawRectangle wnd x Nothing) bars
display wnd
evt <- waitEvent wnd
case evt of
Nothing -> return ()
Just SFEvtClosed -> return ()
Just (SFEvtKeyPressed {}) -> return ()
Just (SFEvtMouseButtonPressed {}) -> return ()
_ -> loop wnd bars
main :: IO () main = do
vMode <- getDesktopMode
let wStyle = [SFFullscreen]
withResource (createRenderWindow vMode "color bars" wStyle Nothing) $
\wnd -> withResources (mapM (makeBar $ barSize vMode) $ zip colors [0..]) $
\bars -> loop wnd bars</lang>
Icon and Unicon
The procedure below is generalized to take a description of a test card and display it.
<lang Icon>link graphics,printf
procedure main() # generalized colour bars
DrawTestCard(Simple_TestCard()) WDone()
end
procedure DrawTestCard(TC)
size := sprintf("size=%d,%d",TC.width,TC.height)
&window := TC.window := open(TC.id,"g","bg=black",size) |
stop("Unable to open window")
every R := TC.bands[r := 1 to *TC.bands -1] do
every C := R.bars[c := 1 to *R.bars - 1] do {
Fg(R.bars[c].colour) FillRectangle( C.left, R.top, R.bars[c+1].left-C.left, TC.bands[r+1].top-R.top ) }
return TC
end
record testcard(window,id,width,height,bands) record band(top,bars) record bar(left,colour)
procedure Simple_TestCard() #: return structure simple testcard
return testcard(,"Simple Test Card",width := 800,height := 600,
[ band( 1, [ bar( 1, "black"), bar(114, "red"), bar(228, "green"), bar(342, "blue"),
bar(456, "magenta"),
bar(570, "cyan"),
bar(684, "yellow"),
bar(width) ] ),
band(height) ]) end</lang>
The following example is a wee tiny bit more interesting.
<lang Icon>procedure SMPTE_TestCard() #: return structure with 480i(ish) testcard
return testcard(,"SMPTE TV Test Card",width := 672,height := 504,
[ band( 1, [ bar( 1, "#c0c0c0"), bar( 95, "#c0c000"),
bar(191, "#00c0c0"),
bar(288, "#00c000"), bar(383, "#c000c0"), bar(480, "#c00000"), bar(575, "#0000c0"), bar(width) ] ), band(335, [ bar( 1, "#0000c0"), bar( 95, "#131313"), bar(191, "#c000c0"), bar(288, "#131313"), bar(383, "#00c0c0"), bar(480, "#131313"), bar(575, "#c0c0c0"), bar(width) ] ), band(378, [ bar( 1, "#00214c"), bar(120, "#ffffff"), bar(240, "#32006a"), bar(360, "#131313"), bar(480, "#090909"), bar(512, "#131313"), bar(544, "#1d1d1d"), bar(576, "#131313"), bar(width) ] ), band(height) ]) end</lang>
graphics.icn provides graphics printf.icn provides sprintf
J
<lang j> load 'viewmat'
size=: 2{.".wd'qm' NB. J6
size=: getscreenwh_jgtk_ NB. J7
'rgb'viewmat (|.size){. (>.&.(%&160)|.size)$ 20# 256#.255*#:i.8</lang>
Note: You need to pick an implementation of size based on the version of J you are using.
Java
<lang java> import java.awt.Color; import java.awt.Graphics;
import javax.swing.JFrame;
public class ColorFrame extends JFrame { public ColorFrame(int width, int height) { this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setSize(width, height); this.setVisible(true); }
@Override public void paint(Graphics g) { Color[] colors = { Color.black, Color.red, Color.green, Color.blue, Color.pink, Color.CYAN, Color.yellow, Color.white };
for (int i = 0; i < colors.length; i++) { g.setColor(colors[i]); g.fillRect(this.getWidth() / colors.length * i, 0, this.getWidth() / colors.length, this.getHeight()); } }
public static void main(String args[]) { new ColorFrame(200, 200); } } </lang>
Julia
<lang julia>using Images
colors = [colorant"black", colorant"red", colorant"green", colorant"darkblue",
colorant"purple", colorant"blue", colorant"yellow", colorant"white"]
wcol = 60 # width of each color bar h, w = 150, wcol * length(colors) + 1 img = Matrix{RGB{N0f8}}(h, w); for (j, col) in zip(1:wcol:w, colors)
img[:, j:j+wcol] = col
end save("data/colourbars.jpg", img)</lang>
Kotlin
<lang scala>import java.awt.Color import java.awt.Graphics import javax.swing.JFrame
class ColorFrame(width: Int, height: Int): JFrame() {
init {
defaultCloseOperation = EXIT_ON_CLOSE
setSize(width, height)
isVisible = true
}
override fun paint(g: Graphics) {
val colors = listOf(Color.black, Color.red, Color.green, Color.blue,
Color.pink, Color.cyan, Color.yellow, Color.white)
val size = colors.size
for (i in 0 until size) {
g.color = colors[i]
g.fillRect(width / size * i, 0, width / size, height)
}
}
}
fun main(args: Array<String>) {
ColorFrame(400, 400)
}</lang> Editing Babbage problem
M2000 Interpreter
Calling a module can be done by using name or call name. The later used for recursive call. Here we use it for beautify the code. <lang M2000 Interpreter> Module Checkit {
Module Bars {
barwidth=x.twips div 8
barheight=y.twips
barcolors=(0,#ff0000,#00ff00, #0000ff, #FF00FF, #00ffff, #ffff00, #ffffff)
For i=0 to 7
Move i*barwidth, 0
\\ gradient fill. Here second color are the same as first color
Fill barwidth, barheight, array(barcolors, i), array(barcolors, i)
Next i
}
\\ first draw on console
Call Bars
Declare Form1 Form
Layer Form1 {
window 12, 10000,8000;
\\ now draw on Form1 layer, above console, in a window
Call Bars
}
Method Form1, "Show", 1 ' open modal
Declare Form1 Nothing
} Checkit </lang>
Maple
<lang Maple> with(plottools): plots:-display([rectangle([0, 0], [.3, 2.1], color = black), rectangle([.3, 0], [.6, 2.1], color = red), rectangle([.6, 0], [.9, 2.1], color = green), rectangle([.9, 0], [1.2, 2.1], color = magenta), rectangle([1.2, 0], [1.5, 2.1], color = cyan), rectangle([1.5, 0], [1.8, 2.1], color = white), rectangle([1.8, 0], [2.1, 2.1], color = yellow)]) </lang>
Mathematica / Wolfram Language
<lang mathematica>ArrayPlot[
ConstantArray[{Black, Red, Green, Blue, Magenta, Cyan, Yellow,
White}, 5]]</lang>
Nim
<lang Nim>import gintro/[glib, gobject, gtk, gio, cairo]
const
Width = 400 Height = 300
- ---------------------------------------------------------------------------------------------------
proc draw(area: DrawingArea; context: Context) =
## Draw the color bars.
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]]
const RectWidth = float(Width div Colors.len) RectHeight = float(Height)
var x = 0.0 for color in Colors: context.rectangle(x, 0, RectWidth, RectHeight) context.setSource(color) context.fill() x += RectWidth
- ---------------------------------------------------------------------------------------------------
proc onDraw(area: DrawingArea; context: Context; data: pointer): bool =
## Callback to draw/redraw the drawing area contents.
area.draw(context) result = true
- ---------------------------------------------------------------------------------------------------
proc activate(app: Application) =
## Activate the application.
let window = app.newApplicationWindow()
window.setSizeRequest(Width, Height)
window.setTitle("Color bars")
# Create the drawing area. let area = newDrawingArea() window.add(area)
# Connect the "draw" event to the callback to draw the spiral.
discard area.connect("draw", ondraw, pointer(nil))
window.showAll()
- ———————————————————————————————————————————————————————————————————————————————————————————————————
let app = newApplication(Application, "Rosetta.ColorBars") discard app.connect("activate", activate) discard app.run()</lang>
OCaml
<lang ocaml>open Graphics
let round x =
int_of_float (floor (x +. 0.5))
let () =
open_graph ""; let cols = size_x () in let rows = size_y () in let colors = [| black; red; green; blue; magenta; cyan; yellow; white |] in let n = Array.length colors in let bar_width = (float cols) /. (float n) in Array.iteri (fun i color -> let x1 = bar_width *. (float i) in let x2 = bar_width *. (float (succ i)) in set_color color; fill_rect (round x1) 0 (round x2) rows; ) colors; ignore (read_key ());
- </lang>
execute with:
$ ocaml graphics.cma display_colour_bars.ml
Perl
<lang Perl>#!/usr/bin/perl -w use strict ; use GD ;
my %colors = ( white => [ 255 , 255 , 255 ] , red => [255 , 0 , 0 ] ,
green => [ 0 , 255 , 0 ] , blue => [ 0 , 0 , 255 ] ,
magenta => [ 255 , 0 , 255 ] , yellow => [ 255 , 255 , 0 ] ,
cyan => [ 0 , 255 , 255 ] , black => [ 0 , 0 , 0 ] ) ;
my $barwidth = 160 / 8 ; my $image = new GD::Image( 160 , 100 ) ; my $start = 0 ; foreach my $rgb ( values %colors ) {
my $paintcolor = $image->colorAllocate( @$rgb ) ; $image->filledRectangle( $start * $barwidth , 0 , $start * $barwidth +
$barwidth - 1 , 99 , $paintcolor ) ;
$start++ ;
} open ( DISPLAY , ">" , "testprogram.png" ) || die ; binmode DISPLAY ; print DISPLAY $image->png ; close DISPLAY ;#to be watched with <image viewer> testprogram.png</lang>
Phix
<lang Phix>-- demo\rosetta\Colour_bars.exw include pGUI.e
constant colours = {CD_BLACK, CD_RED, CD_GREEN, CD_BLUE, CD_MAGENTA, CD_CYAN, CD_YELLOW, CD_WHITE}
Ihandle dlg, canvas cdCanvas cddbuffer, cdcanvas
function redraw_cb(Ihandle /*ih*/, integer /*posx*/, integer /*posy*/)
cdCanvasActivate(cddbuffer)
integer {width, height} = IupGetIntInt(canvas, "DRAWSIZE")
integer x = 0, lc = length(colours)
for i=1 to lc do
integer w = floor((width-x)/(lc-i+1))
cdCanvasSetForeground(cddbuffer, colours[i])
cdCanvasBox(cddbuffer, x, x+w, 0, height)
x += w
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
procedure main()
IupOpen()
canvas = IupCanvas(NULL) IupSetAttribute(canvas, "RASTERSIZE", "600x400") -- initial size
IupSetCallback(canvas, "MAP_CB", Icallback("map_cb"))
IupSetCallback(canvas, "UNMAP_CB", Icallback("unmap_cb"))
dlg = IupDialog(canvas)
IupSetAttribute(dlg, "TITLE", "Colour bars")
IupSetCallback(canvas, "ACTION", Icallback("redraw_cb"))
IupCloseOnEscape(dlg)
IupMap(dlg) IupSetAttribute(canvas, "RASTERSIZE", NULL) -- release the minimum limitation
IupShowXY(dlg,IUP_CENTER,IUP_CENTER)
IupMainLoop()
IupClose()
end procedure
main()</lang>
PHP
Will output result directly to the browser. Use it as CGI/BIN script. <lang PHP><?php $colors = array(array( 0, 0, 0), // black
array(255, 0, 0), // red
array( 0, 255, 0), // green
array( 0, 0, 255), // blue
array(255, 0, 255), // magenta
array( 0, 255, 255), // cyan
array(255, 255, 0), // yellow
array(255, 255, 255)); // white
define('BARWIDTH', 640 / count($colors)); define('HEIGHT', 480);
$image = imagecreate(BARWIDTH * count($colors), HEIGHT);
foreach ($colors as $position => $color) {
$color = imagecolorallocate($image, $color[0], $color[1], $color[2]);
imagefilledrectangle($image, $position * BARWIDTH, 0,
$position * BARWIDTH + BARWIDTH - 1,
HEIGHT - 1, $color);
}
header('Content-type:image/png'); imagepng($image); imagedestroy($image);</lang>
Alternately, with HTML output:
<lang PHP><?php $colors = array(
"000000", // black
"FF0000", // red
"00FF00", // green
"0000FF", // blue
"FF00FF", // magenta
"00FFFF", // cyan
"FFFF00", // yellow
"FFFFFF", // white
);
echo '
'; foreach ($colors as $color) { echo '';}
echo '';</lang>
PicoLisp
<lang PicoLisp>(call 'clear)
(let Width (in '(tput cols) (read))
(do (in '(tput lines) (read))
(for B (range 0 7)
(call 'tput 'setab B)
(space (/ Width 8)) )
(prinl) ) )
(call 'tput 'sgr0) # reset</lang>
Plain English
<lang plainenglish>To run: Start up. Clear the screen. Divide the screen width by 8 giving a bar width. Make a bar with 0 and 0 and the bar width and the screen's bottom. Draw the color bars using the bar. Refresh the screen. Wait for the escape key. Shut down.
To divide the screen width by a number giving a width: Put the screen's right into the width. Divide the width by the number.
A bar is a box.
To draw a bar using a color and move it over: Draw and fill the bar with the color. Move the bar right the bar's width.
To draw the color bars using a bar: Draw the bar using the black color and move it over. Draw the bar using the red color and move it over. Draw the bar using the green color and move it over. Draw the bar using the blue color and move it over. Draw the bar using the magenta color and move it over. Draw the bar using the cyan color and move it over. Draw the bar using the yellow color and move it over. Draw and fill the bar using the white color.</lang>
PowerShell
<lang PowerShell> [string[]]$colors = "Black" , "DarkBlue" , "DarkGreen" , "DarkCyan",
"DarkRed" , "DarkMagenta", "DarkYellow", "Gray",
"DarkGray", "Blue" , "Green" , "Cyan",
"Red" , "Magenta" , "Yellow" , "White"
for ($i = 0; $i -lt 64; $i++) {
for ($j = 0; $j -lt $colors.Count; $j++)
{
Write-Host (" " * 12) -BackgroundColor $colors[$j] -NoNewline
}
Write-Host
} </lang>
Processing
<lang processing>fullScreen(); noStroke(); color[] cs = {
color(0), // black color(255,0,0), // red color(0,255,0), // green color(255,0,255), // magenta color(0,255,255), // cyan color(255,255,0), // yellow color(255) // white
}; for(int i=0; i<7; i++) {
fill(cs[i]); rect(i*width/8,0,width/8,height);
}</lang>
Python
<lang Python>
- !/usr/bin/env python
- vertical coloured stripes in window in Python 2.7.1
from livewires import *
horiz=640; vert=480 begin_graphics(width=horiz,height=vert,title="v_stripes",background=Colour.black) NameColors=["black","red","green","dark_blue","purple","blue","yellow","white"] stepik=horiz/len(NameColors)
for index,each in enumerate(NameColors): ExcStrng="set_colour(Colour."+each+")" exec ExcStrng box(index*stepik,0,(index+1)*stepik,vert,filled=1)
while keys_pressed() != ['x']: # press x key to terminate program pass
end_graphics() </lang>
R
Create the color palette, set margins to zero so the image will fill the display, and use image to create the graphic:
<lang R> pal <- c("black", "red", "green", "blue", "magenta", "cyan", "yellow", "white") par(mar = rep(0, 4)) image(matrix(1:8), col = pal, axes = FALSE) </lang>
Racket
<lang Racket>
- lang racket/gui
(define-values [W H] (get-display-size #t))
(define colors
'("Black" "Red" "Green" "Blue" "Magenta" "Cyan" "Yellow" "White"))
(define (paint-pinstripe canvas dc)
(send dc set-pen "black" 0 'transparent) (for ([x (in-range 0 W (/ W (length colors)))] [c colors]) (send* dc (set-brush c 'solid) (draw-rectangle x 0 W H))))
(define full-frame%
(class frame%
(define/override (on-subwindow-char r e)
(when (eq? 'escape (send e get-key-code))
(send this show #f)))
(super-new
[label "Color bars"] [width W] [height H]
[style '(no-caption no-resize-border hide-menu-bar no-system-menu)])
(define c (new canvas% [parent this] [paint-callback paint-pinstripe]))
(send this show #t)))
(void (new full-frame%)) </lang>
Raku
(formerly Perl 6)
<lang perl6>my ($x,$y) = 1280, 720;
my @colors = map -> $r, $g, $b { Buf.new: |(($r, $g, $b) xx $x div 8) },
0, 0, 0,
255, 0, 0,
0, 255, 0,
0, 0, 255,
255, 0, 255,
0, 255, 255,
255, 255, 0,
255, 255, 255;
my $img = open "colorbars.ppm", :w orelse die "Can't create colorbars.ppm: $_";
$img.print: qq:to/EOH/;
P6 # colorbars.ppm $x $y 255 EOH
for ^$y {
for ^@colors -> $h {
$img.write: @colors[$h];
}
}
$img.close;</lang>
REXX
Programming note: because of the way the REXX interpreters (being used for this example) ensure screen output fidelity, if ninety characters are displayed on a ninety-byte wide screen, REXX apparently forces an extra blank, causing to what appears to be a blank line after the line displayed. Because of this, the last color bar (_.8) has been shortened by one byte.
<lang rexx>/*REXX program displays eight colored vertical bars on a full screen. */ parse value scrsize() with sd sw . /*the screen depth and width. */ barWidth=sw%8 /*calculate the bar width. */ _.=copies('db'x, barWidth) /*the bar, full width. */ _.8=left(_.,barWidth-1) /*the last bar width, less one. */
$ = x2c('1b5b73') || x2c("1b5b313b33376d") /* the preamble, and the header. */
hdr.1 = x2c('1b5b303b33306d') /* " color black. */ hdr.2 = x2c('1b5b313b33316d') /* " color red. */ hdr.3 = x2c('1b5b313b33326d') /* " color green. */ hdr.4 = x2c('1b5b313b33346d') /* " color blue. */ hdr.5 = x2c('1b5b313b33356d') /* " color magenta. */ hdr.6 = x2c('1b5b313b33366d') /* " color cyan. */ hdr.7 = x2c('1b5b313b33336d') /* " color yellow. */ hdr.8 = x2c('1b5b313b33376d') /* " color white. */
tail = x2c('1b5b751b5b303b313b33363b34303b306d') /* " epilogue, and the trailer.*/
/* [↓] last bar width is shrunk. */
do j=1 for 8 /*build the line, color by color. */
$=$ || hdr.j || _.j /*append the color header + bar. */
end /*j*/ /* [↑] color order is the list. */
/* [↓] the tail is overkill. */
$=$ || tail /*append the epilogue (trailer). */
/* [↓] show full screen of bars. */
do k=1 for sd /*SD = screen depth (from above). */
say $ /*have REXX display line of bars. */
end /*k*/ /* [↑] Note: SD could be zero. */
/*stick a fork in it, we're done. */</lang>
This REXX program makes use of scrsize REXX program (or BIF) which is used to determine the screen size of the terminal (console).
The SCRSIZE.REX REXX program is included here ──► SCRSIZE.REX.
output appears identical to the output for Icon and Unicon, Mathematica, and R examples.
Ring
<lang ring> load "guilib.ring"
new qapp
{
win1 = new qwidget() {
setwindowtitle("drawing using qpainter")
setwinicon(self,"C:\Ring\bin\image\browser.png")
setgeometry(100,100,500,600)
label1 = new qlabel(win1) {
setgeometry(10,10,400,400)
settext("")
}
new qpushbutton(win1) {
setgeometry(200,400,100,30)
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)
}
new qpainter() {
begin(p1)
setpen(pen)
//Black, Red, Green, Blue, Magenta, Cyan, Yellow, White
for n = 1 to 8
color2 = new qcolor(){
switch n
on 1 r=0 g=0 b=0
on 2 r=255 g=0 b=0
on 3 r=0 g=255 b=0
on 4 r=0 g=0 b=255
on 5 r=255 g=0 b=255
on 6 r=0 g=255 b=255
on 7 r=255 g=255 b=0
on 8 r=255 g=255 b=255
off
setrgb(r,g,b,255)
}
mybrush = new qbrush() {setstyle(1) setcolor(color2)}
setbrush(mybrush)
drawrect(n*25,25,25,70)
next
endpaint()
}
label1 { setpicture(p1) show() }
</lang> Output : Colour bars
Ruby
JRubyArt is a port of Processing to the ruby language <lang ruby>
- Array of web colors black, red, green, blue, magenta, cyan, yellow, white
PALETTE = %w[#000000 #ff0000 #00ff00 #0000ff #ff00ff #00ffff #ffffff].freeze
def settings
full_screen
end
def setup
PALETTE.each_with_index do |col, idx| fill color(col) rect(idx * width / 8, 0, width / 8, height) end
end </lang>
Scala
<lang scala>import java.awt.Color import scala.swing._
class ColorBars extends Component {
override def paintComponent(g:Graphics2D)={
val colors=List(Color.BLACK, Color.RED, Color.GREEN, Color.BLUE, Color.MAGENTA, Color.CYAN, Color.YELLOW, Color.WHITE)
val colCount=colors.size
val deltaX=size.width.toDouble/colCount
for(x <- 0 until colCount){
val startX=(deltaX*x).toInt
val endX=(deltaX*(x+1)).toInt
g.setColor(colors(x))
g.fillRect(startX, 0, endX-startX, size.height)
}
}
}</lang> Open window:
<lang scala>new MainFrame(){
title="Color bars" visible=true preferredSize=new Dimension(640, 320) contents=new ColorBars()
}</lang>
Sidef
<lang ruby>require('GD');
var colors = Hash.new(
white => [255, 255, 255],
red => [255, 0, 0],
green => [0, 255, 0],
blue => [0, 0, 255],
magenta => [255, 0, 255],
yellow => [255, 255, 0],
cyan => [0, 255, 255],
black => [0, 0, 0],
);
var barwidth = 160/8; var image = %s'GD::Image'.new(160, 100); var start = 0;
colors.values.each { |rgb|
var paintcolor = image.colorAllocate(rgb...); image.filledRectangle(start * barwidth, 0, start*barwidth + barwidth - 1, 99, paintcolor); start++;
};
%f'colorbars.png'.open('>:raw').print(image.png);</lang>
SmileBASIC
<lang smilebasic>FOR I=0 TO 7
READ R,G,B GFILL I*50,0,I*50+49,239,RGB(R,G,B)
NEXT REPEAT UNTIL BUTTON(0) AND #B
DATA 0,0,0 DATA 255,0,0 DATA 0,255,0 DATA 0,0,255 DATA 255,0,255 DATA 0,255,255 DATA 255,255,0 DATA 255,255,255</lang>
Tcl
<lang tcl>package require Tcl 8.5 package require Tk 8.5
wm attributes . -fullscreen 1 pack [canvas .c -highlightthick 0] -fill both -expand 1 set colors {black red green blue magenta cyan yellow white}
for {set x 0} {$x < [winfo screenwidth .c]} {incr x 8} {
.c create rectangle $x 0 [expr {$x+7}] [winfo screenheight .c] \
-fill [lindex $colors 0] -outline {}
set colors [list {*}[lrange $colors 1 end] [lindex $colors 0]]
}</lang>
UNIX Shell
<lang sh>#!/bin/sh clear WIDTH=`tput cols` HEIGHT=`tput lines` NUMBARS=8 BARWIDTH=`expr $WIDTH / $NUMBARS`
l="1" # Set the line counter to 1 while [ "$l" -lt $HEIGHT ]; do
b="0" # Bar counter
while [ "$b" -lt $NUMBARS ]; do
tput setab $b
s="0"
while [ "$s" -lt $BARWIDTH ]; do
echo -n " "
s=`expr $s + 1`
done
b=`expr $b + 1`
done
echo # newline
l=`expr $l + 1`
done
tput sgr0 # reset</lang>
Wren
<lang ecmascript>import "graphics" for Canvas, Color import "dome" for Window
class Game {
static init() {
Window.title = "Color bars"
__width = 400
__height = 400
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
]
drawBars(colors)
}
static drawBars(colors) {
var w = __width / colors.count
var h = __height
for (i in 0...colors.count) {
Canvas.rectfill(w*i, 0, w, h, colors[i])
}
}
static update() {}
static draw(dt) {}
}</lang>
XPL0
<lang XPL0>include c:\cxpl\codes; \intrinsic code declarations int W, X0, X1, Y, C; [SetVid($13); \320x200x8 graphics W:= 320/8; \width of color bar (pixels) for C:= 0 to 8-1 do
[X0:= W*C; X1:= X0+W-1;
for Y:= 0 to 200-1 do
[Move(X0, Y); Line(X1, Y, C)];
];
C:= ChIn(1); \wait for keystroke SetVid(3); \restore normal text mode ]</lang>
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