Anonymous user
Sierpinski square curve: Difference between revisions
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Output image: [https://github.com/trizen/rc/blob/master/img/sierpi%C5%84ski_square_curve-sidef.png Sierpiński square curve]
=={{header|VBScript}}==
Output to html (svg) displayed in the default browser. A turtle graphics class helps to keep the curve definition simple
<lang vb>
option explicit
'outputs turtle graphics to svg file and opens it
const pi180= 0.01745329251994329576923690768489 ' pi/180
const pi=3.1415926535897932384626433832795 'pi
class turtle
dim fso
dim fn
dim svg
dim iang 'radians
dim ori 'radians
dim incr
dim pdown
dim clr
dim x
dim y
public property let orient(n):ori = n*pi180 :end property
public property let iangle(n):iang= n*pi180 :end property
public sub pd() : pdown=true: end sub
public sub pu() :pdown=FALSE :end sub
public sub rt(i)
ori=ori - i*iang:
'if ori<0 then ori = ori+pi*2
end sub
public sub lt(i):
ori=(ori + i*iang)
'if ori>(pi*2) then ori=ori-pi*2
end sub
public sub bw(l)
x= x+ cos(ori+pi)*l*incr
y= y+ sin(ori+pi)*l*incr
' ori=ori+pi '?????
end sub
public sub fw(l)
dim x1,y1
x1=x + cos(ori)*l*incr
y1=y + sin(ori)*l*incr
if pdown then line x,y,x1,y1
x=x1:y=y1
end sub
Private Sub Class_Initialize()
setlocale "us"
initsvg
x=400:y=400:incr=100
ori=90*pi180
iang=90*pi180
clr=0
pdown=true
end sub
Private Sub Class_Terminate()
disply
end sub
private sub line (x,y,x1,y1)
svg.WriteLine "<line x1=""" & x & """ y1= """& y & """ x2=""" & x1& """ y2=""" & y1 & """/>"
end sub
private sub disply()
dim shell
svg.WriteLine "</svg></body></html>"
svg.close
Set shell = CreateObject("Shell.Application")
shell.ShellExecute fn,1,False
end sub
private sub initsvg()
dim scriptpath
Set fso = CreateObject ("Scripting.Filesystemobject")
ScriptPath= Left(WScript.ScriptFullName, InStrRev(WScript.ScriptFullName, "\"))
fn=Scriptpath & "SIERP.HTML"
Set svg = fso.CreateTextFile(fn,True)
if SVG IS nothing then wscript.echo "Can't create svg file" :vscript.quit
svg.WriteLine "<!DOCTYPE html>" &vbcrlf & "<html>" &vbcrlf & "<head>"
svg.writeline "<style>" & vbcrlf & "line {stroke:rgb(255,0,0);stroke-width:.5}" &vbcrlf &"</style>"
svg.writeline "</head>"&vbcrlf & "<body>"
svg.WriteLine "<svg xmlns=""http://www.w3.org/2000/svg"" width=""800"" height=""800"" viewBox=""0 0 800 800"">"
end sub
end class
'to half.sierpinski :size :level
' if :level = 0 [forward :size stop]
' half.sierpinski :size :level - 1
' left 45
' forward :size * sqrt 2
' left 45
' half.sierpinski :size :level - 1
' right 90
' forward :size
' right 90
' half.sierpinski :size :level - 1
' left 45
' forward :size * sqrt 2
' left 45
' half.sierpinski :size :level - 1
'end
const raiz2=1.4142135623730950488016887242097
sub media_sierp (niv,sz)
if niv=0 then x.fw sz: exit sub
media_sierp niv-1,sz
x.lt 1
x.fw sz*raiz2
x.lt 1
media_sierp niv-1,sz
x.rt 2
x.fw sz
x.rt 2
media_sierp niv-1,sz
x.lt 1
x.fw sz*raiz2
x.lt 1
media_sierp niv-1,sz
end sub
'to sierpinski :size :level
' half.sierpinski :size :level
' right 90
' forward :size
' right 90
' half.sierpinski :size :level
' right 90
' forward :size
' right 90
'end
sub sierp(niv,sz)
media_sierp niv,sz
x.rt 2
x.fw sz
x.rt 2
media_sierp niv,sz
x.rt 2
x.fw sz
x.rt 2
end sub
dim x
set x=new turtle
x.iangle=45
x.orient=0
x.incr=1
x.x=100:x.y=270
'star5
sierp 5,4
set x=nothing
</lang>
=={{header|Wren}}==
{{trans|Go}}
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