⚠️ 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}}
;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 ::::::* magenta ::::::* cyan ::::::* yellow ::::::* white
ActionScript
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);
}
}
}
}
AutoHotkey
{{libheader|GDI+}} (available at http://www.autohotkey.net/~tic/Gdip.ahk)
#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
BASIC
=
Applesoft BASIC
=
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
=
BBC BASIC
= {{works with|BBC BASIC for Windows}}
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
=
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$(x)) for changing color, which are generally the same across all platforms, although the system palettes themselves may differ. This is combined with printing a "reverse video" space (solid block) character in the color selected.
5 REM COLOR BARS PROGRAM
10 PRINT CHR$(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$="" THEN 100
110 END
280 REM BECAUSE THE CONTROL CODES FOR COLOR ARE NON-SEQUENTIAL,
285 REM WE PUT THEM INTO A SEQUENTIAL ARRAY FOR USE
300 DATA 144,5,28,159,156,30,31,158
305 REM OMIT OR REM THE NEXT LINE FOR VIC-20
310 DATA 129,149,150,151,152,153,154,155
320 DATA 0:REM DATA TERMINATOR
=
Liberty BASIC
=
nomainwin
colors$="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
=
Locomotive Basic
=
[[File:CPC color bars.png|thumb|right]]
Show the default MODE 0 palette (includes two blinking colors at the end):
10 MODE 0:BORDER 23
20 FOR x=0 TO 15
30 ORIGIN x*40,0
40 GRAPHICS PEN x
50 FOR z=0 TO 39 STEP 4:MOVE z,0:DRAW z,400:NEXT
60 NEXT
70 CALL &bb06 ' wait for key press
=
PureBasic
= Press Enter or Escape to exit the program.
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, $FF) ;white
If Not InitKeyboard(): End: EndIf ;can't init keyboard
If Not InitSprite(): End: EndIf ;can't init sprite/screen library
If Not ExamineDesktops(): End: EndIf ;can't retrieve information about desktop
height = DesktopHeight(0)
width = DesktopWidth(0)
depth = DesktopDepth(0)
If OpenScreen(width, height, depth, "Press ENTER to exit")
StartDrawing(ScreenOutput())
For c = 0 To 7
Box((width * c) / 8, 0, width / 8, height, color(c))
Next
StopDrawing()
FlipBuffers()
Repeat
Delay(10)
ExamineKeyboard()
Until KeyboardPushed(#PB_Key_Escape) Or KeyboardPushed(#PB_Key_Return)
CloseScreen()
EndIf
=Alternate method using console=
DataSection
;Black, Red, Green, Blue, Magenta, Cyan, Yellow, White
Data.i 0, 12, 10, 9, 13, 11, 14, 15
EndDataSection
Dim colors(7)
For c = 0 To 7
Read.i colors(c)
Next
If OpenConsole()
;The console display is 80 columns wide by 25 rows
For r = 0 To 24
For c = 0 To 7
ConsoleColor(colors(c), colors(c))
Print(Space(80 / 8))
Next
Next
EnableGraphicalConsole(1)
ConsoleLocate(0, 0)
ConsoleTitle("Press ENTER to exit"): Input()
CloseConsole()
EndIf
=
Run BASIC
=
colors$ = "black,red,green,blue,magenta,cyan,yellow,white"
html "<TABLE BORDER=1 CELLPADDING=0 CELLSPACING=4><tr height=70>"
for i = 1 to 8
html "<td width=20 bgcolor='";word$(colors$,i,",");"'</td>"
next i
html "</tr></table>"
Output
[[File:ColorBarRunBasic.png]]
=
TI Basic
=
=
ZX Spectrum Basic
=
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
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.
<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["
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
#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; }
Graphics Mode
The required functions and structures are in graphics.h, conio.h is included for getch().
#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; }
C++
using Qt 4.6
file colorbars.h:
#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
file colorbars.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 ; } }
file main.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( ) ; }
COBOL
{{works with|OpenCOBOL}}
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
.
EasyLang
[https://easylang.online/apps/run.html?bg=eee&code=col%5B%5D%20%3D%20%5B%20000%20900%20090%20909%20099%20990%20999%20%5D%0Aw%23%20%3D%20100.0%20/%20len%20col%5B%5D%0Afor%20i%20range%20len%20col%5B%5D%0Acolor%20col%5Bi%5D%0Amove%20w%23%20%2A%20i%200%0Arect%20w%23%20100%0A. Run it]
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
.
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
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.
\ 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
```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
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
Go
{{libheader|Go Graphics}}
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") }
{{out}}
Image similar to R entry.
Haskell
Terminal-based version.
#!/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
Graphical version using SFML.
-- 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
=={{header|Icon}} and {{header|Unicon}}== The procedure below is generalized to take a description of a ''test card'' and display it. [[File:Colourbars_Simple_Unicon.png|thumb|right]]
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
The following example is a wee tiny bit more interesting. [[File:Colourbars_SMPTE_Unicon.png|thumb|right]]
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
{{libheader|Icon Programming Library}} [http://www.cs.arizona.edu/icon/library/src/procs/graphics.icn graphics.icn provides graphics] [http://www.cs.arizona.edu/icon/library/src/procs/printf.icn printf.icn provides sprintf]
J
load 'viewmat'
size=: 2{.".wd'qm' NB. J6
size=: getscreenwh_jgtk_ '' NB. J7
'rgb'viewmat (|.size){. (>.&.(%&160)|.size)$ 20# 256#.255*#:i.8
Note: You need to pick an implementation of size based on the version of J you are using.
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); } }
Julia
{{works with|Julia|0.6}}
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)
Kotlin
{{trans|Java}}
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) }
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.
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
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)])
=={{header|Mathematica}} / {{header|Wolfram Language}}==
ArrayPlot[
ConstantArray[{Black, Red, Green, Blue, Magenta, Cyan, Yellow,
White}, 5]]
[[File:ColourBarsMathematica.png]]
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 ()); ;;
execute with: $ ocaml graphics.cma display_colour_bars.ml
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 $image->png ; close DISPLAY ;#to be watched with <image viewer> testprogram.png
Perl 6
{{works with|Rakudo|2018.10}}
my ($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;
Phix
{{libheader|pGUI}}
--
-- demo\rosetta\Colour_bars.exw
--
include pGUI.e
constant colours = {CD_BLACK, CD_RED, CD_GREEN, 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
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") -- 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"))
IupSetCallback(dlg, "K_ANY", Icallback("esc_close"))
IupMap(dlg)
IupSetAttribute(canvas, "RASTERSIZE", NULL) -- release the minimum limitation
IupShowXY(dlg,IUP_CENTER,IUP_CENTER)
IupMainLoop()
IupClose()
end procedure
main()
PHP
{{trans|Perl}} Will output result directly to the browser. Use it as CGI/BIN script.
<?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);
Alternately, with HTML output:
<?php $colors = array( "000000", // black "FF0000", // red "00FF00", // green "0000FF", // blue "FF00FF", // magenta "00FFFF", // cyan "FFFF00", // yellow "FFFFFF", // white ); echo '<table style="border: 1px solid black; border-spacing: 0;"><tr>'; foreach ($colors as $color) { echo '<td style="background-color: #'.$color.'; height: 100px; width: 20px;"></td>'; } echo '</tr></table>';
PicoLisp
{{trans|UNIX Shell}}
(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
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 }
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()
R
Create the color palette, set margins to zero so the image will fill the display, and use image to create the graphic: [[File:ColorBarR.png|thumb|right]]
pal <- c("black", "red", "green", "blue", "magenta", "cyan", "yellow", "white") par(mar = rep(0, 4)) image(matrix(1:8), col = pal, axes = FALSE)
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%))
REXX
{{works with|PC REXX}} {{works with|Personal REXX}} {{works with|R4}} {{works with|ROO}}
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.
/*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. */
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
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() }
Output : [https://lh3.googleusercontent.com/-_y0FSmg0NAs/V1xBPvGV2tI/AAAAAAAAAKk/TXYSJnpdZ346aQLd05yE9vLM8V9lEht1QCLcB/s1600/CalmoSoftColourBars.jpg Colour bars]
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) } } }
Open window: [[File:colorbars_scala.png|thumb|right]]
new MainFrame(){ title="Color bars" visible=true preferredSize=new Dimension(640, 320) contents=new ColorBars() }
Sidef
{{trans|Perl}}
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);
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
Tcl
{{libheader|Tk}}
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]] }
== {{header|UNIX Shell}} ==
#!/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
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
]
{{omit from|AWK}} {{omit from|Axe}} {{omit from|GUISS}}
[[Category:Test card]] [[Category:Terminal control]]