View source for Sunflower fractal

{{draft task}}
{{Clarify task}}
Draw a [https://1drv.ms/u/s!AqDUIunCqVnIg1U89bApXAzPU9XH Sunflower fractal]
<br>
<br>
<br>

=={{header|11l}}==
{{trans|Perl}}

<syntaxhighlight lang="11l">-V
   phi = (1 + sqrt(5)) / 2
   size = 600
   seeds = 5 * size

print(‘<svg xmlns="http://www.w3.org/2000/svg" width="’size‘" height="’size‘" style="stroke:gold">’)
print(‘<rect width="100%" height="100%" fill="black" />’)

L(i) 1..seeds
   V r = 2 * (i ^ phi) / seeds
   V t = 2 * math:pi * phi * i
   print(‘<circle cx="#.2" cy="#.2" r="#.1" />’.format(r * sin(t) + size / 2,
                                                       r * cos(t) + size / 2, sqrt(i) / 13))

print(‘</svg>’)</syntaxhighlight>

=={{header|Action!}}==
Calculations on a real Atari 8-bit computer take quite long time. It is recommended to use an emulator capable with increasing speed of Atari CPU. 
{{libheader|Action! Tool Kit}}
{{libheader|Action! Real Math}}
<syntaxhighlight lang="action!">INCLUDE "H6:REALMATH.ACT"

INT ARRAY SinTab=[
  0 4 9 13 18 22 27 31 36 40 44 49 53 58 62 66 71 75 79 83
  88 92 96 100 104 108 112 116 120 124 128 132 136 139 143
  147 150 154 158 161 165 168 171 175 178 181 184 187 190
  193 196 199 202 204 207 210 212 215 217 219 222 224 226
  228 230 232 234 236 237 239 241 242 243 245 246 247 248
  249 250 251 252 253 254 254 255 255 255 256 256 256 256]

INT FUNC Sin(INT a)
  WHILE a<0 DO a==+360 OD
  WHILE a>360 DO a==-360 OD
  IF a<=90 THEN
    RETURN (SinTab(a))
  ELSEIF a<=180 THEN
    RETURN (SinTab(180-a))
  ELSEIF a<=270 THEN
    RETURN (-SinTab(a-180))
  ELSE
    RETURN (-SinTab(360-a))
  FI
RETURN (0)

INT FUNC Cos(INT a)
RETURN (Sin(a-90))

PROC Circle(INT x0,y0,d)
  BYTE MaxD=[13]
  BYTE ARRAY Start=[0 1 2 4 6 9 12 16 20 25 30 36 42 49]
  BYTE ARRAY MaxY=[0 0 1 1 2 2 3 3 4 4 5 5 6 6]
  INT ARRAY CircleX=[
    0  0  1 0  1 1  2 1 0  2 2 1  3 2 2 0  3 3 2 1
    4 4 3 2 1  4 4 4 3 2  5 5 4 4 3 1  5 5 5 4 4 2
    6 6 5 5 4 3 1  6 6 6 5 5 4 2]

  INT i,ind,max
  CARD x
  BYTE dx,y

  IF d>MAXD THEN d=MaxD FI
  IF d<0 THEN d=0 FI

  ind=Start(d)
  max=MaxY(d)
  FOR i=0 TO max
  DO
    dx=CircleX(ind)
    y=y0-i
    IF (y>=0) AND (y<=191) THEN
      Plot(x0-dx,y) DrawTo(x0+dx,y)
    FI
    y=y0+i
    IF (y>=0) AND (y<=191) THEN
      Plot(x0-dx,y) DrawTo(x0+dx,y)
    FI
    ind==+1
  OD
RETURN

PROC DrawFractal(CARD seeds INT x0,y0)
  CARD i
  REAL a,c,r,ir,tmp,tmp2,r256,rx,ry,rr,r360,c360,seeds2
  INT ia,sc,x,y

  IntToReal(256,r256)
  ValR("1.618034",c) ;c=(sqrt(5)+1)/2
  IntToReal(seeds/2,seeds2) ;seeds2=seeds/2
  IntToReal(360,r360)
  RealMult(r360,c,c360) ;c360=360*c

  FOR i=0 TO seeds
  DO
    IntToReal(i,ir)
    Power(ir,c,tmp) 
    RealDiv(tmp,seeds2,r) ;r=i^c/(seeds/2)
    RealMult(c360,ir,a) ;a=360*c*i

    WHILE RealGreaterOrEqual(a,r360)
    DO
      RealSub(a,r360,tmp)
      RealAssign(tmp,a)
    OD

    ia=RealToInt(a)
    sc=Sin(ia)
    IntToRealForNeg(sc,tmp)
    RealDiv(tmp,r256,tmp2)
    RealMult(r,tmp2,rx)
    x=Round(rx) ;x=r*sin(a)
    
    sc=Cos(ia)
    IntToRealForNeg(sc,tmp)
    RealDiv(tmp,r256,tmp2)
    RealMult(r,tmp2,ry)
    y=Round(ry) ;y=r*cos(a)

    Circle(x+x0,y+y0,10*i/seeds)

    Poke(77,0) ;turn off the attract mode
  OD
RETURN

PROC Main()
  BYTE CH=$02FC,COLOR1=$02C5,COLOR2=$02C6

  Graphics(8+16)
  Color=1
  COLOR1=$12
  COLOR2=$18

  DrawFractal(1000,160,96)

  DO UNTIL CH#$FF OD
  CH=$FF
RETURN</syntaxhighlight>
{{out}}
[https://gitlab.com/amarok8bit/action-rosetta-code/-/raw/master/images/Sunflower_fractal.png Screenshot from Atari 8-bit computer]

=={{header|Applesoft BASIC}}==
<syntaxhighlight lang="gwbasic">HGR:A=PEEK(49234):C=(SQR(5)+1)/2:N=900:FORI=0TO1600:R=(I^C)/N:A=8*ATN(1)*C*I:X=R*SIN(A)+139:Y=R*COS(A)+96:F=7-4*((X-INT(X/2)*2)>=.75):X=(X>=0ANDX<280)*X:Y=(Y>=0ANDY<192)*Y:HCOLOR=F*(XANDY):HPLOTX,Y:NEXT</syntaxhighlight>

=={{header|C}}==
The colouring of the "fractal" is determined with every iteration to ensure that the resulting graphic looks similar to a real Sunflower, thus the parameter ''diskRatio'' determines the radius of the central disk as the maximum radius of the flower is known from the number of iterations. The scaling factor is currently hardcoded but can also be externalized. Requires the [http://www.cs.colorado.edu/~main/bgi/cs1300/ WinBGIm] library.

<syntaxhighlight lang="c">
/*Abhishek Ghosh, 14th September 2018*/

#include<graphics.h>
#include<math.h>

#define pi M_PI

void sunflower(int winWidth, int winHeight, double diskRatio, int iter){
	double factor = .5 + sqrt(1.25),r,theta;
	double x = winWidth/2.0, y = winHeight/2.0;
	double maxRad = pow(iter,factor)/iter;
	
	int i;
	
	setbkcolor(LIGHTBLUE);
	
	for(i=0;i<=iter;i++){
		r = pow(i,factor)/iter;
		
		r/maxRad < diskRatio?setcolor(BLACK):setcolor(YELLOW);
		
		theta = 2*pi*factor*i;
		circle(x + r*sin(theta), y + r*cos(theta), 10 * i/(1.0*iter));
	}
}

int main()
{
	initwindow(1000,1000,"Sunflower...");
	
	sunflower(1000,1000,0.5,3000);
	
	getch();
	
	closegraph();
	
	return 0;
}
</syntaxhighlight>

=={{header|C++}}==
{{trans|Perl}}
<syntaxhighlight lang="cpp">#include <cmath>
#include <fstream>
#include <iostream>

bool sunflower(const char* filename) {
    std::ofstream out(filename);
    if (!out)
        return false;

    constexpr int size = 600;
    constexpr int seeds = 5 * size;
    constexpr double pi = 3.14159265359;
    constexpr double phi = 1.61803398875;
    
    out << "<svg xmlns='http://www.w3.org/2000/svg\' width='" << size;
    out << "' height='" << size << "' style='stroke:gold'>\n";
    out << "<rect width='100%' height='100%' fill='black'/>\n";
    out << std::setprecision(2) << std::fixed;
    for (int i = 1; i <= seeds; ++i) {
        double r = 2 * std::pow(i, phi)/seeds;
        double theta = 2 * pi * phi * i;
        double x = r * std::sin(theta) + size/2;
        double y = r * std::cos(theta) + size/2;
        double radius = std::sqrt(i)/13;
        out << "<circle cx='" << x << "' cy='" << y << "' r='" << radius << "'/>\n";
    }
    out << "</svg>\n";
    return true;
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        std::cerr << "usage: " << argv[0] << " filename\n";
        return EXIT_FAILURE;
    }
    if (!sunflower(argv[1])) {
        std::cerr << "image generation failed\n";
        return EXIT_FAILURE;
    }
    return EXIT_SUCCESS;
}</syntaxhighlight>

{{out}}
[[Media:Sunflower cpp.svg]]

=={{header|FreeBASIC}}==
<syntaxhighlight lang="freebasic">
Const PI As Double = 4 * Atn(1)
Const ancho = 400
Const alto =  400

Screenres ancho, alto, 8
Windowtitle" Pulsa una tecla para finalizar"
Cls

Sub Sunflower(semillas As Integer)
    Dim As Double c = (Sqr(5)+1)/2
    
    For i As Integer = 0 To semillas
        Dim As Double r = (i^c) / semillas
        Dim As Double angulo = 2 * Pi * c * i
        Dim As Double x = r * Sin(angulo) + 200
        Dim As Double y = r * Cos(angulo) + 200
        
        Circle (x, y), i/semillas*10, i/semillas*10
    Next i
End Sub

Sunflower(2000)
Bsave "sunflower_fractal.bmp",0
Sleep
End
</syntaxhighlight>

=={{header|Fōrmulæ}}==

{{FormulaeEntry|page=https://formulae.org/?script=examples/Sunflower_model}}

'''Solution'''

The method consists in drawing points on a spriral, an archimedean spiral, where two contiguous points are separated (in angle) by the golden angle.

Because the points tend to agglomerate in the center, they are smaller there.

[[File:Fōrmulæ - Sunflower model 01.png]]

[[File:Fōrmulæ - Sunflower model 02.png]]

[[File:Fōrmulæ - Sunflower model 03.png]]

'''Improvement'''

Last result is not natural. Florets in a sunflower are all equal size.

H. Vogel proposed to use a Fermat spiral, in such a case, the florets are equally spaced, and we can use now circles with the same size:

[[File:Fōrmulæ - Sunflower model 04.png]]

[[File:Fōrmulæ - Sunflower model 05.png]]

[[File:Fōrmulæ - Sunflower model 06.png]]

=={{header|FutureBasic}}==
<syntaxhighlight lang="futurebasic">
window 1, @"Sunflower Fractal", ( 0, 0, 400, 400 )
WindowSetBackgroundColor( 1, fn ColorBlack )

void local fn SunflowerFractal
  NSUinteger seeds = 4000
  double     c, i, angle, x, y, r
  
  pen 2.0, fn ColorWithRGB( 0.997, 0.838, 0.038, 1.0 )
  
  c = ( sqr(5) + 1 ) / 2
  for i = 0 to seeds
    r = (i ^ c) / seeds
    angle = 2 * pi * c * i
    x = r * sin(angle) + 200
    y = r * cos(angle) + 200
    oval ( x, y, i / seeds * 5, i / seeds * 5 )
  next
end fn

fn SunflowerFractal

HandleEvents
</syntaxhighlight>
[[file:Sunflower_Fractal.png]]

=={{header|Go}}==
{{libheader|Go Graphics}} 
{{trans|Ring}}
<br>
The image produced, when viewed with (for example) EOG, is similar to the Ring entry.
<syntaxhighlight lang="go">package main

import (
    "github.com/fogleman/gg"
    "math"
)

func main() {
    dc := gg.NewContext(400, 400)
    dc.SetRGB(1, 1, 1)
    dc.Clear()
    dc.SetRGB(0, 0, 1)
    c := (math.Sqrt(5) + 1) / 2
    numberOfSeeds := 3000
    for i := 0; i <= numberOfSeeds; i++ {
        fi := float64(i)
        fn := float64(numberOfSeeds)
        r := math.Pow(fi, c) / fn
        angle := 2 * math.Pi * c * fi
        x := r*math.Sin(angle) + 200
        y := r*math.Cos(angle) + 200
        fi /= fn / 5
        dc.DrawCircle(x, y, fi)
    }
    dc.SetLineWidth(1)
    dc.Stroke()
    dc.SavePNG("sunflower_fractal.png")
}</syntaxhighlight>

=={{header|javascript}}==
HTML to test
<pre>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Sunflower</title>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <style>
            body{background-color:black;text-align:center;margin-top:150px}
        </style>
        <script src="sunflower.js"></script>
    </head>
    <body onload="start()">
        <div id='wnd'></div>
    </body>
</html>
</pre>
<syntaxhighlight lang="javascript">const SIZE = 400, HS = SIZE >> 1, WAIT = .005, SEEDS = 3000, 
      TPI = Math.PI * 2, C = (Math.sqrt(10) + 1) / 2;
class Sunflower {
    constructor() {
        this.wait = WAIT;
        this.colorIndex = 0;
        this.dimension = 0;
        this.lastTime = 0;
        this.accumulator = 0;
        this.deltaTime = 1 / 60;
        this.colors = ["#ff0000", "#ff8000", "#ffff00", "#80ff00", "#00ff00", "#00ff80", 
                       "#00ffff", "#0080ff", "#0000ff", "#8000ff", "#ff00ff", "#ff0080"];
        this.canvas = document.createElement('canvas');
        this.canvas.width = SIZE;
        this.canvas.height = SIZE;
        const d = document.getElementById("wnd");
        d.appendChild(this.canvas);
        this.ctx = this.canvas.getContext('2d');
    }
    draw(clr, d) {
        let r = Math.pow(d, C) / SEEDS;
        let angle = TPI * C * d;
        let x = HS + r * Math.sin(angle), 
            y = HS + r * Math.cos(angle);
        this.ctx.strokeStyle = clr;
        this.ctx.beginPath();
        this.ctx.arc(x, y, d / (SEEDS / 50), 0, TPI);
        this.ctx.closePath();
        this.ctx.stroke();
    }
    update(dt) {
        if((this.wait -= dt) < 0) {
            this.draw(this.colors[this.colorIndex], this.dimension);
            this.wait = WAIT;
            if((this.dimension++) > 600) {
                this.dimension = 0;
                this.colorIndex = (this.colorIndex + 1) % this.colors.length;
            }
        }
    }
    start() {
        this.loop = (time) => {
            this.accumulator += (time - this.lastTime) / 1000;
            while(this.accumulator > this.deltaTime) {
                this.accumulator -= this.deltaTime;
                this.update(Math.min(this.deltaTime));
            }
            this.lastTime = time;
            requestAnimationFrame(this.loop);
        }
        this.loop(0);
    }
}
function start() {
    const sunflower = new Sunflower();
    sunflower.start();
}</syntaxhighlight>

=={{header|J}}==

This (currently draft) task really needs an adequate description.  Still, it's straightforward to derive code from another implementation on this page.

This implementation assumes a recent J implementation (for example, J903):

<syntaxhighlight lang="j">require'format/printf'

sunfract=: {{ NB. y: number of "sunflower seeds"
  phi=. 0.5*1+%:5
  XY=. (y%10)+(2*(I^phi)%y) * +.^j.2*1p1*phi*I=.1+i.y
  XY,.(%:I)%13
}}

sunfractsvg=: {{
  fract=. sunfract x
  C=.,'\n<circle cx="%.2f" cy="%.2f" r="%.1f" />' sprintf fract
  ({{)n
    <svg xmlns="http://www.w3.org/2000/svg" width="%d" height="%d" style="stroke:gold">
      <rect width="100%%" height="100%%" fill="black" />
        %s
    </svg>
}} sprintf (;/<.20+}:>./fract),<C) fwrite y}}
</syntaxhighlight>

Example use:

<syntaxhighlight lang="j">
   3000 sunfractsvg '~/sunfract.html'
129147
</syntaxhighlight>

(The number displayed is the size of the generated file.)

=={{header|jq}}==
'''Adapted from [[#Perl|Perl]]'''
{{works with|jq}}
'''Works with gojq, the Go implementation of jq'''

<syntaxhighlight lang="jq"># SVG headers
def svg(size):
  "<svg xmlns='http://www.w3.org/2000/svg' width='\(size)'",
  "height='\(size)' style='stroke:gold'>",
  "<rect width='100%' height='100%' fill='black'/>";

# emit the "<circle />" elements
def sunflower(size):
  def rnd: 100*.|round/100;

  (5 * size) as $seeds
  | ((1|atan) * 4) as $pi
  | ((1 + (5|sqrt)) / 2) as $phi
  | range(1; 1 + $seeds) as $i
  | {}
  | .r = 2 * pow($i; $phi)/$seeds
  | .theta = 2 * $pi * $phi * $i
  | .x = .r * (.theta|sin) + size/2
  | .y = .r * (.theta|cos) + size/2
  | .radius = ($i|sqrt)/13
  | "<circle cx='\(.x|rnd)' cy='\(.y|rnd)' r='\(.radius|rnd)' />" ;

def end_svg:
  "</svg>";

svg(600),
sunflower(600),
end_svg</syntaxhighlight>

=={{header|Julia}}==
{{trans|R}}
Run from REPL.
<syntaxhighlight lang="julia">using GLMakie

function sunflowerplot()
    len = 2000
    ϕ = 0.5 + sqrt(5) / 2
    r = LinRange(0.0, 100.0, len)
    θ = zeros(len)
    markersizes = zeros(Int, len)
    for i in 2:length(r)
        θ[i] = θ[i - 1] + 2π * ϕ
        markersizes[i] = div(i, 500) + 9
    end
    x = r .* cos.(θ)
    y = r .* sin.(θ)
    f = Figure()
    ax = Axis(f[1, 1], backgroundcolor = :green)
    scatter!(ax, x, y, color = :gold, markersize = markersizes, strokewidth = 1)
    hidespines!(ax)
    hidedecorations!(ax)
    return f
end

sunflowerplot()
</syntaxhighlight>

{{output}}

[[File:Sunflower-julia.png|center|thumb]]


=={{header|Liberty BASIC}}==
<syntaxhighlight lang="lb">
nomainwin
UpperLeftX=1:UpperLeftY=1
WindowWidth=800:WindowHeight=600
open "Sunflower Fractal" for graphics_nf_nsb as #1
#1 "trapclose [q];down;fill darkred;flush;size 3"

    c=1.618033988749895
    seeds=8000
    rd=gn=bl=int(rnd(1)*255)

    for i=0 to seeds
        rd=rd+5:if rd>254 then rd=1
        gn=gn+3:if gn>254 then gn=1
        bl=bl+1:if bl>254 then bl=1
        #1 "color ";rd;" ";gn;" ";bl
        #1 "backcolor ";rd;" ";gn;" ";bl
        r=(i^c)/seeds
        angle=2*3.14159*c*i
        x=r*sin(angle)+400
        y=r*cos(angle)+280
        #1 "place ";x;" ";y
        #1 "circlefilled ";i/seeds*5
        scan
    next i
    wait

[q]
    close #1
    end
</syntaxhighlight>

=={{header|Mathematica}} / {{header|Wolfram Language}}==
<syntaxhighlight lang="mathematica">numseeds = 3000;
pts = Table[
   i = N[ni];
   r = i^GoldenRatio/numseeds;
   t = 2 Pi GoldenRatio i;
   Circle[AngleVector[{r, t}], i/(numseeds/3)]
   ,
   {ni, numseeds}
   ];
Graphics[pts]</syntaxhighlight>

=={{header|Microsoft Small Basic}}==
{{trans|Ring}}
<syntaxhighlight lang="smallbasic">' Sunflower fractal - 24/07/2018
  GraphicsWindow.Width=410
  GraphicsWindow.Height=400
  c=(Math.SquareRoot(5)+1)/2
  numberofseeds=3000
  For i=0 To numberofseeds
    r=Math.Power(i,c)/numberofseeds
    angle=2*Math.Pi*c*i
    x=r*Math.Sin(angle)+200
    y=r*Math.Cos(angle)+200
    GraphicsWindow.DrawEllipse(x, y, i/numberofseeds*10, i/numberofseeds*10)
  EndFor </syntaxhighlight>
{{out}}
[https://1drv.ms/u/s!AoFH_AlpH9oZgf5kvtRou1Wuc5lSCg Sunflower fractal]

=={{header|Nim}}==
{{trans|Go}}
{{libheader|imageman}}
<syntaxhighlight lang="nim">import math
import imageman

const
  Size = 600
  Background = ColorRGBU [byte 0, 0, 0]
  Foreground = ColorRGBU [byte 0, 255, 0]
  C = (sqrt(5.0) + 1) / 2
  NumberOfSeeds = 6000
  Fn = float(NumberOfSeeds)

var image = initImage[ColorRGBU](Size, Size)
image.fill(Background)

for i in 0..<NumberOfSeeds:
  let
    fi = float(i)
    r = pow(fi, C) / Fn
    angle = 2 * PI * C * fi
    x = toInt(r * sin(angle) + Size div 2)
    y = toInt(r * cos(angle) + Size div 2)
  image.drawCircle(x, y, toInt(8 * fi / Fn), Foreground)

image.savePNG("sunflower.png", compression = 9)</syntaxhighlight>

=={{header|Objeck}}==
{{trans|C}}
<syntaxhighlight lang="perl">use Game.SDL2;
use Game.Framework;

class Test {
  @framework : GameFramework;
  @colors : Color[];
  
  function : Main(args : String[]) ~ Nil {
    Test->New()->Run();
  }
  
  New() {
    @framework := GameFramework->New(GameConsts->SCREEN_WIDTH, GameConsts->SCREEN_HEIGHT, "Test");
    @framework->SetClearColor(Color->New(0, 0, 0));
    @colors := Color->New[2];
    @colors[0] := Color->New(255,128,0); 
    @colors[1] := Color->New(255,255,25); 
  }
  
  method : Run() ~ Nil {
    if(@framework->IsOk()) {
      e := @framework->GetEvent();
      
      quit := false;
      while(<>quit) {
        # process input
        while(e->Poll() <> 0) {
          if(e->GetType() = EventType->SDL_QUIT) {
            quit := true;
          };
        };

        @framework->FrameStart();
        Render(525,525,0.50,3000);
        @framework->FrameEnd();
      };
    }
    else {
      "--- Error Initializing Environment ---"->ErrorLine();
      return;
    };

    leaving {
      @framework->Quit();
    };
  }

  method : Render(winWidth : Int, winHeight : Int, diskRatio : Float, iter : Int) ~ Nil {
    renderer := @framework->GetRenderer();

    @framework->Clear();

    factor := 0.5 + 1.25->SquareRoot();
    x := winWidth / 2.0;
    y := winHeight / 2.0;
    maxRad := Float->Power(iter, factor) / iter;

    for(i:=0;i<=iter;i+=1;) {
      r := Float->Power(i,factor)/iter;
      color := r/maxRad < diskRatio ? @colors[0] : @colors[1];
      theta := 2*Float->Pi()*factor*i;
      renderer->CircleColor(x + r*theta->Sin(), y + r*theta->Cos(), 10 * i/(1.0*iter), color);
    };
        
    @framework->Show();
  }
}

consts GameConsts {
  SCREEN_WIDTH := 640,
  SCREEN_HEIGHT := 480
}
</syntaxhighlight>

=={{header|Perl}}==
{{trans|Sidef}}
<syntaxhighlight lang="perl">use utf8;
use constant π => 3.14159265;
use constant φ => (1 + sqrt(5)) / 2;

my $scale = 600;
my $seeds = 5*$scale;

print qq{<svg xmlns="http://www.w3.org/2000/svg" width="$scale" height="$scale" style="stroke:gold">
           <rect width="100%" height="100%" fill="black" />\n};

for $i (1..$seeds) {
    $r = 2 * ($i**φ) / $seeds;
    $t = 2 * π * φ * $i;
    $x = $r * sin($t) + $scale/2;
    $y = $r * cos($t) + $scale/2;
    printf qq{<circle cx="%.2f" cy="%.2f" r="%.1f" />\n}, $x, $y, sqrt($i)/13;
}

print "</svg>\n";</syntaxhighlight>
See [https://github.com/SqrtNegInf/Rosettacode-Perl5-Smoke/blob/master/ref/sunflower.svg Phi-packing image] (SVG image)

=={{header|Phix}}==
{{libheader|Phix/pGUI}}
{{libheader|Phix/online}}
You can run this online [http://phix.x10.mx/p2js/SunflowerFractal.htm here].
<!--<syntaxhighlight lang="phix">(phixonline)-->
 <span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
 <span style="color: #008080;">constant</span> <span style="color: #000000;">numberofseeds</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">3000</span>
  
 <span style="color: #008080;">include</span> <span style="color: #000000;">pGUI</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
  
 <span style="color: #004080;">Ihandle</span> <span style="color: #000000;">dlg</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">canvas</span>
 <span style="color: #004080;">cdCanvas</span> <span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">cdcanvas</span>
  
 <span style="color: #008080;">function</span> <span style="color: #000000;">redraw_cb</span><span style="color: #0000FF;">(</span><span style="color: #004080;">Ihandle</span> <span style="color: #000080;font-style:italic;">/*ih*/</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000080;font-style:italic;">/*posx*/</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000080;font-style:italic;">/*posy*/</span><span style="color: #0000FF;">)</span>
  
     <span style="color: #004080;">integer</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">hw</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">hh</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">sq_floor_div</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">IupGetIntInt</span><span style="color: #0000FF;">(</span><span style="color: #000000;">canvas</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"DRAWSIZE"</span><span style="color: #0000FF;">),</span><span style="color: #000000;">2</span><span style="color: #0000FF;">)</span>
     <span style="color: #004080;">atom</span> <span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">min</span><span style="color: #0000FF;">(</span><span style="color: #000000;">hw</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hh</span><span style="color: #0000FF;">)/</span><span style="color: #000000;">150</span><span style="color: #0000FF;">,</span>
          <span style="color: #000000;">f</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">min</span><span style="color: #0000FF;">(</span><span style="color: #000000;">hw</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hh</span><span style="color: #0000FF;">)*</span><span style="color: #000000;">8</span><span style="color: #0000FF;">/</span><span style="color: #000000;">125</span>
     <span style="color: #7060A8;">cdCanvasActivate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">)</span>
     <span style="color: #7060A8;">cdCanvasClear</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">)</span>
     <span style="color: #004080;">atom</span> <span style="color: #000000;">c</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #7060A8;">sqrt</span><span style="color: #0000FF;">(</span><span style="color: #000000;">5</span><span style="color: #0000FF;">)+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)/</span><span style="color: #000000;">2</span>
     <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">numberofseeds</span> <span style="color: #008080;">do</span>
         <span style="color: #004080;">atom</span> <span style="color: #000000;">r</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">power</span><span style="color: #0000FF;">(</span><span style="color: #000000;">i</span><span style="color: #0000FF;">,</span><span style="color: #000000;">c</span><span style="color: #0000FF;">)/</span><span style="color: #000000;">numberofseeds</span><span style="color: #0000FF;">,</span>
              <span style="color: #000000;">angle</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">2</span><span style="color: #0000FF;">*</span><span style="color: #004600;">PI</span><span style="color: #0000FF;">*</span><span style="color: #000000;">c</span><span style="color: #0000FF;">*</span><span style="color: #000000;">i</span><span style="color: #0000FF;">,</span>
              <span style="color: #000000;">x</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">*</span><span style="color: #000000;">r</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">sin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">angle</span><span style="color: #0000FF;">)+</span><span style="color: #000000;">hw</span><span style="color: #0000FF;">,</span>
              <span style="color: #000000;">y</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">*</span><span style="color: #000000;">r</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">cos</span><span style="color: #0000FF;">(</span><span style="color: #000000;">angle</span><span style="color: #0000FF;">)+</span><span style="color: #000000;">hh</span>
         <span style="color: #7060A8;">cdCanvasCircle</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">,</span><span style="color: #000000;">x</span><span style="color: #0000FF;">,</span><span style="color: #000000;">y</span><span style="color: #0000FF;">,</span><span style="color: #000000;">i</span><span style="color: #0000FF;">/</span><span style="color: #000000;">numberofseeds</span><span style="color: #0000FF;">*</span><span style="color: #000000;">f</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">for</span> 
     <span style="color: #7060A8;">cdCanvasFlush</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">return</span> <span style="color: #004600;">IUP_DEFAULT</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
  
 <span style="color: #008080;">function</span> <span style="color: #000000;">map_cb</span><span style="color: #0000FF;">(</span><span style="color: #004080;">Ihandle</span> <span style="color: #000000;">ih</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">cdcanvas</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">cdCreateCanvas</span><span style="color: #0000FF;">(</span><span style="color: #004600;">CD_IUP</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">ih</span><span style="color: #0000FF;">)</span>
     <span style="color: #000000;">cddbuffer</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">cdCreateCanvas</span><span style="color: #0000FF;">(</span><span style="color: #004600;">CD_DBUFFER</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">cdcanvas</span><span style="color: #0000FF;">)</span>
     <span style="color: #7060A8;">cdCanvasSetBackground</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">,</span> <span style="color: #004600;">CD_WHITE</span><span style="color: #0000FF;">)</span>
     <span style="color: #7060A8;">cdCanvasSetForeground</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">,</span> <span style="color: #004600;">CD_BLACK</span><span style="color: #0000FF;">)</span>
     <span style="color: #008080;">return</span> <span style="color: #004600;">IUP_DEFAULT</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
  
 <span style="color: #008080;">procedure</span> <span style="color: #000000;">main</span><span style="color: #0000FF;">()</span>
     <span style="color: #7060A8;">IupOpen</span><span style="color: #0000FF;">()</span>
  
     <span style="color: #000000;">canvas</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupCanvas</span><span style="color: #0000FF;">(</span><span style="color: #004600;">NULL</span><span style="color: #0000FF;">)</span>
     <span style="color: #7060A8;">IupSetAttribute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">canvas</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"RASTERSIZE"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"602x502"</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- initial size</span>
     <span style="color: #7060A8;">IupSetCallback</span><span style="color: #0000FF;">(</span><span style="color: #000000;">canvas</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"MAP_CB"</span><span style="color: #0000FF;">,</span> <span style="color: #7060A8;">Icallback</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"map_cb"</span><span style="color: #0000FF;">))</span>
  
     <span style="color: #000000;">dlg</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupDialog</span><span style="color: #0000FF;">(</span><span style="color: #000000;">canvas</span><span style="color: #0000FF;">)</span>
     <span style="color: #7060A8;">IupSetAttribute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"TITLE"</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Sunflower"</span><span style="color: #0000FF;">)</span>
     <span style="color: #7060A8;">IupSetCallback</span><span style="color: #0000FF;">(</span><span style="color: #000000;">canvas</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"ACTION"</span><span style="color: #0000FF;">,</span> <span style="color: #7060A8;">Icallback</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"redraw_cb"</span><span style="color: #0000FF;">))</span>
  
     <span style="color: #7060A8;">IupShow</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">)</span>
     <span style="color: #7060A8;">IupSetAttribute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">canvas</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"RASTERSIZE"</span><span style="color: #0000FF;">,</span> <span style="color: #004600;">NULL</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- release the minimum limitation</span>
     <span style="color: #008080;">if</span> <span style="color: #7060A8;">platform</span><span style="color: #0000FF;">()!=</span><span style="color: #004600;">JS</span> <span style="color: #008080;">then</span>
         <span style="color: #7060A8;">IupMainLoop</span><span style="color: #0000FF;">()</span>
         <span style="color: #7060A8;">IupClose</span><span style="color: #0000FF;">()</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
 <span style="color: #000000;">main</span><span style="color: #0000FF;">()</span>
<!--</syntaxhighlight>-->

=={{header|Processing}}==
{{trans|C}}
<syntaxhighlight lang="java">
//Abhishek Ghosh, 26th June 2022

size(1000,1000);
surface.setTitle("Sunflower...");

int iter = 3000;
float factor = .5 + sqrt(1.25),r,theta,diskRatio=0.5;
float x = width/2.0, y = height/2.0;
double maxRad = pow(iter,factor)/iter;
int i;
 
background(#add8e6); //Lightblue background
 
for(i=0;i<=iter;i++){
  r = pow(i,factor)/iter;

  if(r/maxRad < diskRatio){
    stroke(#000000);        // Black central disk
  }
  else
    stroke(#ffff00);       // Yellow Petals

  theta = 2*PI*factor*i;
  ellipse(x + r*sin(theta), y + r*cos(theta), 10 * i/(1.0*iter),10 * i/(1.0*iter));
}
</syntaxhighlight>

=={{header|Python}}==
<syntaxhighlight lang="python">
from turtle import *
from math import *

# Based on C implementation

iter = 3000
diskRatio = .5

factor = .5 + sqrt(1.25)

screen = getscreen()

(winWidth, winHeight) = screen.screensize()

#x = winWidth/2.0

#y = winHeight/2.0

x = 0.0
y = 0.0

maxRad = pow(iter,factor)/iter;

bgcolor("light blue")

hideturtle()

tracer(0, 0)

for i in range(iter+1):
    r = pow(i,factor)/iter;
    
    if r/maxRad < diskRatio:
        pencolor("black")
    else:
        pencolor("yellow")
 
    theta = 2*pi*factor*i;
        
    up()
    
    setposition(x + r*sin(theta), y + r*cos(theta))
    
    down()
       
    circle(10.0 * i/(1.0*iter))
    
update()

done()
</syntaxhighlight>

=={{header|R}}==
<syntaxhighlight lang="r">
phi=1/2+sqrt(5)/2
r=seq(0,1,length.out=2000)
theta=numeric(length(r))
theta[1]=0
for(i in 2:length(r)){
  theta[i]=theta[i-1]+phi*2*pi
}
x=r*cos(theta)
y=r*sin(theta)
par(bg="black")
plot(x,y)
size=seq(.5,2,length.out = length(x))
thick=seq(.1,2,length.out = length(x))
for(i in 1:length(x)){
  points(x[i],y[i],cex=size[i],lwd=thick[i],col="goldenrod1")
}
</syntaxhighlight>
{{Out}}
[https://raw.githubusercontent.com/schwartstack/sunflower/master/sunflower2.png Sunflower]

=={{header|Racket}}==

{{trans|C}}

<syntaxhighlight lang="racket">#lang racket

(require 2htdp/image)

(define N 3000)
(define DISK-RATIO 0.5)
(define factor (+ 0.5 (sqrt 1.25)))
(define WIDTH 500)
(define HEIGHT 500)
(define max-rad (/ (expt N factor) N))

(for/fold ([image (empty-scene WIDTH HEIGHT)]) ([i (in-range N)])
  (define r (/ (expt i factor) N))
  (define color (if (< (/ r max-rad) DISK-RATIO) 'brown 'darkyellow))
  (define theta (* 2 pi factor i))
  (place-image (circle (* 10 i (/ 1 N)) 'outline color)
               (+ (/ WIDTH 2) (* r (sin theta)))
               (+ (/ HEIGHT 2) (* r (cos theta)))
               image))</syntaxhighlight>

=={{header|Raku}}==
(formerly Perl 6)
{{works with|Rakudo|2018.06}}
This is not really a fractal. It is more accurately an example of a Fibonacci spiral or Phi-packing.

Or, to be completely accurate: It is a variation of a generative [[wp:Fermat's_spiral|Fermat's spiral]] using the Vogel model to implement phi-packing. See: [https://thatsmaths.com/2014/06/05/sunflowers-and-fibonacci-models-of-efficiency/ https://thatsmaths.com/2014/06/05/sunflowers-and-fibonacci-models-of-efficiency] 

<syntaxhighlight lang="raku" line>use SVG;

my $seeds  = 3000;
my @center = 300, 300;
my $scale  = 5;

constant \φ = (3 - 5.sqrt) / 2;

my @c = map {
    my ($x, $y) = ($scale * .sqrt) «*« |cis($_ * φ * τ).reals »+« @center;
    [ $x.round(.01), $y.round(.01), (.sqrt * $scale / 100).round(.1) ]
}, 1 .. $seeds;

say SVG.serialize(
    svg => [
        :600width, :600height, :style<stroke:yellow>,
        :rect[:width<100%>, :height<100%>, :fill<black>],
        |@c.map( { :circle[:cx(.[0]), :cy(.[1]), :r(.[2])] } ),
    ],
);</syntaxhighlight>
See: [https://github.com/thundergnat/rc/blob/master/img/phi-packing-perl6.svg Phi packing] (SVG image)

=={{header|Ring}}==
<syntaxhighlight lang="ring">
# Project : Sunflower fractal

load "guilib.ring"

paint = null

new qapp 
        {
        win1 = new qwidget() {
                  setwindowtitle("Sunflower fractal")
                  setgeometry(100,100,320,500)
                  label1 = new qlabel(win1) {
                              setgeometry(10,10,400,400)
                              settext("")
                  }
                  new qpushbutton(win1) {
                          setgeometry(100,400,100,30)
                          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)
        }
        paint = new qpainter() {
                  begin(p1)
                  setpen(pen)

        c = (sqrt(5) + 1) / 2
        numberofseeds = 3000
        for i = 0 to numberofseeds
              r = pow(i, c ) / (numberofseeds)
              angle = 2 * 3.14 * c * i
              x = r * sin(angle) + 100
              y = r * cos(angle) + 100
             drawellipse(x, y, i / (numberofseeds / 10), i / (numberofseeds / 10))
        next

        endpaint()
        }
        label1 { setpicture(p1) show() }
</syntaxhighlight>
Output:

[https://1drv.ms/u/s!AqDUIunCqVnIg1U89bApXAzPU9XH Sunflower fractal]

=={{header|Sidef}}==
{{trans|Go}}
<syntaxhighlight lang="ruby">require('Imager')

func draw_sunflower(seeds=3000) {
    var img = %O<Imager>.new(
        xsize => 400,
        ysize => 400,
    )

    var c = (sqrt(1.25) + 0.5)
    { |i|
        var r = (i**c / seeds)
        var θ = (2 * Num.pi * c * i)
        var x = (r * sin(θ) + 200)
        var y = (r * cos(θ) + 200)
        img.circle(x => x, y => y, r => i/(5*seeds))
    } * seeds

    return img
}

var img = draw_sunflower()
img.write(file => "sunflower.png")</syntaxhighlight>
Output image: [https://github.com/trizen/rc/blob/master/img/sunflower-sidef.png Sunflower fractal]

=={{header|V (Vlang)}}==
<syntaxhighlight lang="v (vlang)">import gg
import gx
import math

fn main() {
    mut context := gg.new_context(
        bg_color: gx.rgb(255, 255, 255)
        width: 400
        height: 400
        frame_fn: frame
    )
    context.run()
}

fn frame(mut ctx gg.Context) {
    ctx.begin()
    c := (math.sqrt(5) + 1) / 2
    num_of_seeds := 3000
    for i := 0; i <= num_of_seeds; i++ {
        mut fi := f64(i)
        n := f64(num_of_seeds)
        r := math.pow(fi, c) / n
        angle := 2 * math.pi * c * fi
        x := r*math.sin(angle) + 200
        y := r*math.cos(angle) + 200
        fi /= n / 5
        ctx.draw_circle_filled(f32(x), f32(y), f32(fi), gx.black)
    }
    ctx.end()
}</syntaxhighlight>

=={{header|Wren}}==
{{trans|Go}}
{{libheader|DOME}}
<syntaxhighlight lang="wren">import "graphics" for Canvas, Color
import "dome" for Window

class Game {
    static init() {
        Window.title = "Sunflower fractal"
        var width = 400
        var height = 400
        Window.resize(width, height)
        Canvas.resize(width, height)
        Canvas.cls(Color.black)
        var col = Color.green
        var seeds = 3000
        sunflower(seeds, col)
    }

    static update() {}

    static draw(alpha) {}

    static sunflower(seeds, col) {
        var c = (5.sqrt + 1) / 2
        for (i in 0..seeds) {
            var r = i.pow(c) / seeds
            var angle = 2 * Num.pi * c * i
            var x = r*angle.sin + 200
            var y = r*angle.cos + 200
            Canvas.circle(x, y, i/seeds*5, col)
        }
    }
}</syntaxhighlight>

=={{header|XPL0}}==
[[File:SunflowerXPL0.gif|200px|thumb|right]]
<syntaxhighlight lang "XPL0">

proc DrawCircle(X0, Y0, R, Color);
int  X0, Y0, R, Color;
int  X, Y, R2;
[R2:= R*R;
for Y:= -R to +R do
    for X:= -R to +R do
        if X*X + Y*Y <= R2 then
            Point(X+X0, Y+Y0, Color);
];

def  Seeds = 3000, Color = $0E; \yellow
def  ScrW = 800, ScrH = 600;
def  Phi = (sqrt(5.)+1.) / 2.;  \golden ratio (1.618...)
def  Pi = 3.14159265358979323846;
real R, Angle, X, Y;
int  I;
[SetVid($103);
for I:= 0 to Seeds-1 do
    [R:= Pow(float(I), Phi) / float(Seeds/2);
    Angle:= 2. * Pi * Phi * float(I);
    X:= R*Sin(Angle);
    Y:= R*Cos(Angle);
    DrawCircle(ScrW/2+fix(X), ScrH/2-fix(Y), I*7/Seeds, Color);
    ];
]</syntaxhighlight>

=={{header|Yabasic}}==
{{trans|Wren}}
<syntaxhighlight lang="yabasic">// Rosetta Code problem: http://rosettacode.org/wiki/Sunflower_fractal
// Adapted from Wren to Yabasic by Galileo, 01/2022

width = 400
height = 400

open window width, height
backcolor 0,0,0
clear window

color 0,255,0
seeds = 3000

c = (sqrt(5) + 1) / 2
for i = 0 to seeds
    r = (i ** c) / seeds
    angle = 2 * pi * c * i
    x = r * sin(angle) + 200
    y = r * cos(angle) + 200
    circle x, y, i / seeds * 5
next</syntaxhighlight>

=={{header|zkl}}==
{{trans|Go}}
Uses Image Magick and
the PPM class from http://rosettacode.org/wiki/Bitmap/Bresenham%27s_line_algorithm#zkl
<syntaxhighlight lang="zkl">fcn sunflower(seeds=3000){
   img,color := PPM(400,400), 0x00ff00;		// green
   c:=((5.0).sqrt() + 1)/2;
   foreach n in ([0.0 .. seeds]){  // floats
      r:=n.pow(c)/seeds;
      x,y := r.toRectangular(r.pi*c*n*2);
      r=(n/seeds*5).toInt();
      img.circle(200 + x, 200 + y, r,color);
   }
   img.writeJPGFile("sunflower.zkl.jpg");
}();</syntaxhighlight>
{{out}}
Image at [http://www.zenkinetic.com/Images/RosettaCode/sunflower.zkl.jpg sunflower fractal]