Color wheel: Difference between revisions
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=={{header|Applesoft BASIC}}==
The lo-resolution GRaphics screen is limited to 16 colors. Ordered dithering is used for the saturation. Pink is mixed with violet and magenta, and aqua is mixed with light blue and green. These lighter colors are randomly mixed with the saturation dither. Note that the four Apple II colors can be seen at the 90 degree marks: orange at 30 degrees, green at 120 degrees, cyan (blue) at
<syntaxhighlight lang="gwbasic"> 100 LET R = 3.1415926535 / 180
110 LET YO = 20
Line 39:
370 IF SCRN( X,Y) = 0 THEN PLOT X,Y:P = P + 1: IF P > = 9 THEN P = 0
380 NEXT I,S</syntaxhighlight>
=={{header|AppleScript}}==
Line 148 ⟶ 149:
{{out}}
[[Media:Colorwheel cpp.png]]
=={{header|C#}}==
<syntaxhighlight lang="csharp">
// constructor of main window
// in MainWindow.xaml just create <Image Name="imgMain" />
public MainWindow()
{
InitializeComponent();
RenderOptions.SetBitmapScalingMode(imgMain, BitmapScalingMode.HighQuality);
imgMain.Source = new WriteableBitmap(480, 480, 96, 96, PixelFormats.Bgr32, null);
// using slider you can change saturation and call DrawHue with different level
DrawHue(100);
}
void DrawHue(int saturation)
{
var bmp = (WriteableBitmap)imgMain.Source;
int centerX = (int)bmp.Width / 2;
int centerY = (int)bmp.Height / 2;
int radius = Math.Min(centerX, centerY);
int radius2 = radius - 40;
bmp.Lock();
unsafe{
var buf = bmp.BackBuffer;
IntPtr pixLineStart;
for(int y=0; y < bmp.Height; y++){
pixLineStart = buf + bmp.BackBufferStride * y;
double dy = (y - centerY);
for(int x=0; x < bmp.Width; x++){
double dx = (x - centerX);
double dist = Math.Sqrt(dx * dx + dy * dy);
if (radius2 <= dist && dist <= radius) {
double theta = Math.Atan2(dy, dx);
double hue = (theta + Math.PI) / (2.0 * Math.PI);
*((int*)(pixLineStart + x * 4)) = HSB_to_RGB((int)(hue * 360), saturation, 100);
}
}
}
}
bmp.AddDirtyRect(new Int32Rect(0, 0, 480, 480));
bmp.Unlock();
}
static int HSB_to_RGB(int h, int s, int v)
{
var rgb = new int[3];
var baseColor = (h + 60) % 360 / 120;
var shift = (h + 60) % 360 - (120 * baseColor + 60 );
var secondaryColor = (baseColor + (shift >= 0 ? 1 : -1) + 3) % 3;
//Setting Hue
rgb[baseColor] = 255;
rgb[secondaryColor] = (int) ((Math.Abs(shift) / 60.0f) * 255.0f);
//Setting Saturation
for (var i = 0; i < 3; i++)
rgb[i] += (int) ((255 - rgb[i]) * ((100 - s) / 100.0f));
//Setting Value
for (var i = 0; i < 3; i++)
rgb[i] -= (int) (rgb[i] * (100-v) / 100.0f);
return RGB2int(rgb[0], rgb[1], rgb[2]);
}
public static int RGB2int(int r, int g, int b) => r << 16 | g << 8 | b;
</syntaxhighlight>
{{out}}
[[File:ColorRing.PNG]]
=={{header|Delphi}}==
Line 254 ⟶ 329:
{{out}}
Png Image [https://ibb.co/T0w8KyF].
=={{header|EasyLang}}==
[https://easylang.dev/show/#cod=bZLdboMwDIXveYpzSagaCrTVqi4Pw08CSHSBkG3w9pOBCjK4AKJzPtvBdmt0jqrPYlNmqL4l+tQiMzU4DEpk4B6ACgI+uWeoRmtDJEOAO5kKAtXqkNRCTEkC+BHOlJOR3O1kBFCTZY+s6agYe19hU6FWk3KhMwCzhD9RQsDiiQwCLbmyWdhow3YLOcfs2XjDtjvWOmxywHYLmZnaYa8b1i5s+5/t5eFfvbmOXO5xr6XZ5b+VlA34PCilDUbqC6zG9fFYEhWkjTgjvr07RuSwJwkmeXBgUuueZtR3xsIvBgTEnShzgGJkK1irmf0UbgIaciVtCoHUpl8xhRaD49OGCfgzdkL0cWEIkdzdLNtt9adSIVViiOaVdeBcN9okB8ZL/0gMCHHDSG/HNDK3uPCEntXg3uZLA5h773l/ Run it]
{{trans|Go}}
<syntaxhighlight>
proc hsb2rgb hue sat bri . r g b .
h = (hue - floor hue) * 6
f = h - floor h
p = bri * (1 - sat)
q = bri * (1 - sat * f)
t = bri * (1 - sat * (1 - f))
h = floor h
if h = 0
r = bri ; g = t ; b = p
elif h = 1
r = q ; g = bri ; b = p
elif h = 2
r = p ; g = bri ; b = t
elif h = 3
r = p ; g = q ; b = bri
elif h = 4
r = t ; g = p ; b = bri
else
r = bri ; g = p ; b = q
.
.
proc cwheel . .
for y = 0 to 499
dy = y - 250
for x = 0 to 499
dx = x - 250
dist = sqrt (dx * dx + dy * dy)
if dist <= 250
theta = atan2 dy dx
hue = (theta + 180) / 360
hsb2rgb hue (dist / 250) 1 r g b
color3 r g b
move x / 5 y / 5
rect 0.3 0.3
.
.
.
.
cwheel
</syntaxhighlight>
=={{header|Fōrmulæ}}==
{{FormulaeEntry|page=https://formulae.org/?script=examples/Color_wheel}}
'''Solution'''
[[File:Fōrmulæ - Color wheel 01.png]]
'''Test case'''
Generating a color wheel of 300x300 pixels:
[[File:Fōrmulæ - Color wheel 02.png]]
[[File:Fōrmulæ - Color wheel 03.png]]
=={{header|FreeBASIC}}==
Line 379 ⟶ 508:
Loop Until Inkey = Chr(27)</syntaxhighlight>
=={{header|FutureBasic}}==
FB has native functions for programmatically building color wheels.
<syntaxhighlight lang="futurebasic">
_window = 1
begin enum output 1
_colorwheelImageView
end enum
void local fn BuildWindow
CGRect r = fn CGRectMake( 0, 0, 400, 400 )
window _window, @"Programmatic Color Wheel", r, NSWindowStyleMaskTitled + NSWindowStyleMaskClosable
r = fn CGRectMake( 20, 20, 360, 360 )
imageview _colorwheelImageView, YES, , r, NSImageScaleProportionallyUpOrDown, NSImageAlignCenter, NSImageFrameNone, _window
end fn
local fn CIImageToImageRef( ciImage as CIImageRef ) as ImageRef
CIImageRepRef rep = fn CIImageRepWithCIImage( ciImage )
CGSize size = fn ImageRepSize( rep )
ImageRef image = fn ImageWithSize( size )
ImageAddRepresentation( image, rep )
end fn = image
local fn ColorWheelImage( colorSpace as CGColorSpaceRef, dither as CFNumberRef, radius as CFNumberRef, softness as CFNumberRef, lightness as CFNumberRef ) as CIImageRef
CIFilterRef filter = fn CIFilterWithName( @"CIHueSaturationValueGradient" )
ObjectSetValueForkey( filter, colorSpace, @"inputColorSpace" )
ObjectSetValueForkey( filter, dither, @"inputDither" )
ObjectSetValueForkey( filter, radius, @"inputRadius" )
ObjectSetValueForkey( filter, softness, @"inputSoftness" )
ObjectSetValueForkey( filter, lightness, @"inputValue" )
CIImageRef outputCIImage = fn CIFilterOutputImage( filter )
end fn = outputCIImage
local fn BuildColorWheel
CIImageRef colorWheelCIImage = fn ColorWheelImage( fn CGColorSpaceCreateDeviceRGB, @0, @160, @0, @1 )
ImageRef colorWheelImage = fn CIImageToImageRef( colorWheelCIImage )
ImageViewSetImage( _colorwheelImageView, colorWheelImage )
end fn
fn BuildWindow
fn BuildColorWheel
HandleEvents
</syntaxhighlight>
{{output}}
[[File:Programmatic Color Wheel.png]]
=={{header|GML}}==
Line 680 ⟶ 857:
<syntaxhighlight lang="lua">
local function hsv_to_rgb (h, s, v) -- values in ranges: [0, 360], [0, 1], [0, 1]
end
function love.load()
end
end
end
function love.draw()
end
</syntaxhighlight>
Line 1,013 ⟶ 1,190:
c = color(int(h * 255), int(s * 255), 255)
set(x, y, c) # note set() used as Processing set() not as Python set()</syntaxhighlight>
=={{header|Plain English}}==
<syntaxhighlight lang="plainenglish">
To draw the color wheel:
Start with the red color.
Turn right 80 points.
Loop.
If the user clicks on the screen, break.
Move to the center of the screen.
Draw a line 2 inches long.
Refresh the screen.
Change the current hue by 10 points.
Turn right 10 points.
Add 1 to a count.
If the count is 384, break. \ Plain English uses a circle divided into 384 degrees
Repeat.
Start in the middle of the screen facing north minus 80 points.
Use medium-sized letters.
Write "RED......YELLOW.....GREEN......CYAN......BLUE.....MAGENTA......" with the white pen 2-1/4 inches from the screen's center.
Refresh the screen.
Shut down.
</syntaxhighlight>
=={{header|Python}}==
Line 1,071 ⟶ 1,271:
(formerly Perl 6)
{{works with|Rakudo|2016.08}}
[[File:Color-wheel-perl6.png|thumb]]
<syntaxhighlight lang="raku" line>use Image::PNG::Portable;
Line 1,108 ⟶ 1,308:
} ).map: ((*+$m) * 255).Int
}</syntaxhighlight>
=={{header|Ring}}==
Line 1,242 ⟶ 1,440:
' -----------------------------------
global pi
pi
steps
graphic #g, 525, 525
Line 1,249 ⟶ 1,447:
for x =0 to 525 step steps
next x
render #g
Line 1,277 ⟶ 1,475:
function atan2(y,x)
if (x = 0) and (y <> 0) then
end if
if y = 0 and (x <> 0) then
end if
If r$ <> "Y" then
end if
end function</syntaxhighlight>
Line 1,376 ⟶ 1,574:
{{out}}
[[Media:Color_wheel_rust.png]]
=={{header|Sidef}}==
Line 1,449 ⟶ 1,647:
This file is no longer there!!! 10 Sep 2021
=={{header|Vala}}==
{{trans|Julia}}
<syntaxhighlight lang="vala">public class Example: Gtk.Application {
private Gtk.ApplicationWindow window;
private Gtk.DrawingArea drawing_area;
public Example() {
Object(application_id: "my.application", flags: ApplicationFlags.FLAGS_NONE);
this.activate.connect(() => {
window = new Gtk.ApplicationWindow(this);
drawing_area = new Gtk.DrawingArea();
drawing_area.set_draw_func(draw_circle);
window.set_child(drawing_area);
window.present();
});
}
private void draw_circle(Gtk.DrawingArea area, Cairo.Context cr, int width, int height) {
int centerx = width / 2;
int centery = height / 2;
double anglestep = 1.0 / width;
for (float theta = (float) 0.0; theta < 360; theta += (float) 0.1) {
float r;
float g;
float b;
Gtk.hsv_to_rgb(theta / (float) 360.0, 1, 1, out r, out g, out b);
cr.set_source_rgb(r, g, b);
cr.line_to(centerx, centery);
cr.arc(centerx, centery, ((double) width) / 2.2, GLib.Math.PI * 2 * theta / 360.0, anglestep);
cr.line_to(centerx, centery);
cr.stroke();
}
}
public static int main(string[] argv) {
var app = new Example();
return app.run(argv);
}
}</syntaxhighlight>
=={{header|VBScript}}==
Building a BMP file and opening it with the default viewer. It takes 5 seconds in my 5 years old notebook. Run with Cscript if you don want to be clicking at annoying message boxes.
<syntaxhighlight lang="vb">
Class ImgClass
Private ImgL,ImgH,ImgDepth,bkclr,
private xmini,xmaxi,ymini,ymaxi,dirx,diry
private filename
private Palette,szpal
public property get xmin():xmin=xmini:end property
public property get ymin():ymin=ymini:end property
public property get xmax():xmax=xmaxi:end property
public property get ymax():ymax=ymaxi:end property
public property let depth(x)
end property
public sub set0 (x0,y0) 'sets the new origin (default tlc). The origin does'nt work if ImgArray is accessed directly
if x0<0 or x0>=imgl or y0<0 or y0>imgh then err.raise 9
xmini=-x0
Line 1,479 ⟶ 1,715:
'constructor
Public Default Function Init(name,w,h,orient,dep,bkg,
'offx, offy posicion de 0,0. si ofx+ , x se incrementa de izq a der, si offy+ y se incrementa de abajo arriba
dim
ImgH=h
loc=getlocale
' not useful as we are not using SetPixel and accessing ImgArray directly
Select Case orient
Case 1: dirx=1 : diry=1
Case 2: dirx=-1 : diry=1
Case
Case 4: dirx=1
End select
filename=name
ImgDepth =dep
'load user palette if provided
if imgdepth=8 then
end if
set init=me
end function
private sub loadpal(mipale)
if isarray(mipale) Then
palette=mipale
szpal=UBound(mipale)+1
Else
szpal=256
'Default palette recycled from ATARI
'removed
, not relevant
End if
End Sub
Line 1,522 ⟶ 1,769:
wscript.echo "copying image to bmp file"
savebmp
wscript.echo "opening " & filename & " with
CreateObject("Shell.Application").ShellExecute filename
wscript.echo timer-tt & "
End Sub
function long2wstr( x) 'falta muy poco!!!
dim k1,k2,x1
k1= (x and &hffff&)' or (&H8000& And ((X And &h8000&)<>0)))
k2=((X And &h7fffffff&) \ &h10000&) Or (&H8000& And (x<0))
long2wstr=chrw(k1) & chrw(k2)
end function
function int2wstr(x)
int2wstr=ChrW((x and &h7fff) or (&H8000 And (X<0)))
End Function
Public Sub SaveBMP
'Save the picture to a bmp file
Dim s,ostream, x,y,loc
const hdrs=54 '14+40
dim bms:bms=ImgH* 4*(((ImgL*
dim
with CreateObject("ADODB.Stream") 'auxiliary ostream, it creates an UNICODE with
.Charset = "
.Type = 2' adTypeText
.open
Line 1,565 ⟶ 1,801:
'build a header
'bmp header: VBSCript does'nt have records nor writes binary values to files, so we use strings of unicode chars!!
'BMP header
.writetext
.writetext long2wstr(hdrs+palsize+bms) ' 2 fiesize
.writetext
'InfoHeader
.writetext long2wstr(40) '14 infoheader size
.writetext long2wstr(Imgl) '18 image length
.writetext long2wstr(imgh) '22 image width
.writetext int2wstr(1) '26 planes
.writetext int2wstr(imgdepth) '28 clr depth (bpp)
.writetext long2wstr(&H0) '30 compression used 0= NOCOMPR
.writetext long2wstr(bms) '34 imgsize
.writetext long2wstr(&Hc4e) '38 bpp hor
.writetext long2wstr(&hc43) '42 bpp vert
.writetext long2wstr(szpal) '46 colors in palette
.writetext long2wstr(&H0) '50 important clrs 0=all
'write bitmap
'precalc data for orientation
Dim x1,x2,y1,y2
If dirx=-1 Then x1=ImgL-1 :x2=0 Else x1=0:x2=ImgL-1
If diry=-1 Then y1=ImgH-1 :y2=0 Else y1=0:y2=ImgH-1
Select Case imgdepth
Case 32
For y=y1 To y2 step diry
For
'writelong fic, Pixel(x,y)
Next
Next
Case 8
For
'image
dim pad:pad=ImgL mod 4
For y=y1 to y2 step diry
For x=x1 To x2 step dirx*2
.writetext chrw((ImgArray(x,y) and 255)+ &h100& *(ImgArray(x+dirx,y) and 255))
Next
'line padding
if
if pad >1 then .writetext
Next
Case Else
WScript.Echo "ColorDepth not supported : " & ImgDepth & " bits"
End Select
'use a second stream to save to file starting past the BOM the first ADODB.Stream has added
Dim outf:Set outf= CreateObject("ADODB.Stream")
outf.Type = 1 ' adTypeBinary
outf.Open
.position=2 'remove bom (1 wchar)
.CopyTo outf
.close
outf.savetofile filename,2 'adSaveCreateOverWrite
outf.close
end with
End Sub
end class
function hsv2rgb( Hue, Sat, Value) 'hue 0-360 0-ro 120-ver 240-az ,sat 0-100,value 0-100
Line 1,666 ⟶ 1,917:
g = Ur + (Vr - Wr) * Rdim
b = 0
end
'b lowest byte, red highest byte
hsv2rgb= ((b and &hff)+256*((g and &hff)+256*(r and &hff))and &hffffff)
end function
Line 1,692 ⟶ 1,943:
const r2=25500
tt=timer
fn=CreateObject("Scripting.FileSystemObject").GetSpecialFolder(2)& "\
Set X = (New ImgClass)(fn,w*2,h*2,1,32,0,0)
x.set0 w,h
Line 1,700 ⟶ 1,951:
for row=x.xmin+1 to x.xmax
row2=row*row
hr=int(
For col=hr To 159
Dim a:a=((col\16 +row\16) And 1)* &hffffff
x.imgArray(col+160,row+160)=a
x.imgArray(-col+160,row+160)=a
next
for col=-hr to hr
sat=100-sqr(row2+col*col)/rad *50
Line 1,708 ⟶ 1,964:
'script.echo row
next
Set X = Nothing
</syntaxhighlight>
=={{out}}==
[[File:Colorwheel vbs.png]]
=={{header|Wren}}==
{{libheader|DOME}}
<syntaxhighlight lang="
import "dome" for Window
import "random" for Random
Line 1,805 ⟶ 2,065:
v,hue:=(x - zero).toFloat().toPolar(y - zero);
if(v<=R){ // only render in the circle
}
}
Line 1,813 ⟶ 2,073:
fcn hsv2rgb(hue,v,s){ // 0<=H<360, 0<=v(brightness)<=1, 0<=saturation<=1
to24bit:=fcn(r,g,b,m){
r,g,b=((r+m)*255).toInt(),((g+m)*255).toInt(),((b+m)*255).toInt();
Line 1,826 ⟶ 2,086:
else if(180<=hue<240) return(to24bit(0.0,x, c, m));
else if(240<=hue<300) return(to24bit(x, 0.0,c, m));
else
}</syntaxhighlight>
{{out}}
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