Julia set: Difference between revisions
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end</syntaxhighlight>
=={{header|FutureBasic}}==
<syntaxhighlight lang="futurebasic">
#build CheckArrayBounds NO
output file "Julia Fractal Viewer
include "NSLog.incl"
begin record Complex
float real // real component of Complex Number
float imag // imaginary component of Complex Number
end record
_window = 1
begin enum output 1
_juliaView
end enum
void local fn BuildWindow
CGRect r = fn CGRectMake( 0, 0, 520, 600 )
window _window, @"Rosetta Code Julia Set", r, NSWindowStyleMaskTitled + NSWindowStyleMaskClosable + NSWindowStyleMaskMiniaturizable
r = fn CGRectMake( 10, 10, 500, 580 )
imageview _juliaView, YES,,r, NSImageScaleAxesIndependently, NSImageAlignCenter, NSImageFramePhoto, _window
end fn
local fn JuliaPoint( c as Complex, w as long, h as long, xl as float, xr as float, yb as float, yt as float, i as long, j as long ) as long
float ai, ar, cr, ci, t, x, y
long k, value
value = 1
cr = c.real
ci = c.imag
x = ( ( float ) ( w - i - 1 ) * xl + ( float ) ( i ) * xr ) / ( float ) ( w - 1 )
y = ( ( float ) ( h - j - 1 ) * yb + ( float ) ( j ) * yt ) / ( float ) ( h - 1 )
ar = x
ai = y
for k = 0 to 199
t = ar * ar - ai * ai + cr
ai = ar * ai + ai * ar + ci
ar = t
if ( 1000 < ar * ar + ai * ai )
value = 0
exit fn
end if
next k
end fn = value
void local fn JuliaRGB( c as Complex, w as long, h as long, xl as float, xr as float, yb as float, yt as float, rgb(0) as unsigned char )
long i, j, juliaValue, k
k = 0
for j = 0 to h - 1
for i = 0 to w - 1
juliaValue = fn JuliaPoint( c, w, h, xl, xr, yb, yt, i, j )
rgb(k) = 255 * (1-juliaValue)
rgb(k+1) = 255 * (1-juliaValue)
rgb(k+2) = 255
k += 3
next i
next j
end fn
void local fn TGAWrite( w as long, h as long, rgb(0) as ^unsigned char, url as CFURLRef )
CFMutableDataRef dta
unsigned char header1(11), header2(5)
BlockZero( @header1(0), 12 * sizeof(unsigned char) )
header1(2) = 2
header2(0) = w mod 256
header2(1) = w/256
header2(2) = h mod 256
header2(3) = h/256
header2(4) = 24
header2(5) = 0
dta = fn MutableDataWithCapacity(0)
MutableDataAppendBytes( dta, @header1(0), 12 * sizeof(unsigned char) )
MutableDataAppendBytes( dta, @header2(0), 6 * sizeof(unsigned char) )
MutableDataAppendBytes( dta, @rgb(0), w * h * 3 * sizeof(unsigned char) )
fn DataWriteToURL( dta, url, NSDataWritingAtomic, NULL )
ImageRef image = fn ImageWithData( dta )
ImageViewSetImage( _juliaView, image )
end fn
void local fn BuildJuliaSet( c as Complex )
long h, w
float xl, xr, yb, yt
ptr p
CFURLRef url
// Create 1000x1000-pixel canvas for image
h = 1000
w = 1000
// Locate image on canvas
xl = -1.5
xr = 1.5
yb = -1.5
yt = 1.5
p = fn malloc( w * h * 3 * sizeof(unsigned char) )
xref rgb(1) as unsigned char
rgb = p
// Create image data
fn JuliaRGB( c, w, h, xl, xr, yb, yt, @rgb(0) )
// Create path to final image
url = fn URLFileURLWithPath( fn StringByExpandingTildeInPath( @"~/Desktop/julia_set.png" ) )
// Write image data to file
fn TGAWrite( w, h, @rgb(0), url )
free(p)
end fn
dim as Complex c
c.real = 0.355534
c.imag = -0.337292
// c.real = -0.8
// c.imag = 0.156
// c.real = 0.26
// c.imag = 0.0016
// c.real = 0.355
// c.imag = 0.355
// c.real = -0.4
// c.imag = -0.59
// c.real = -0.54
// c.imag = 0.54
fn BuildWindow
fn BuildJuliaSet( c )
HandleEvents
</syntaxhighlight>
{{output}}
[[File:Julia Set.png]]
=={{header|Fōrmulæ}}==
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