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Sierpinski arrowhead curve: Difference between revisions

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Sierpinski arrowhead curve (view source)

Revision as of 14:59, 1 September 2021

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=={{header|Phix}}==
{{libheader|Phix/pGUI}}
<langYou Phix>--can demo\rosetta\run this online [http://phix.x10.mx/p2js/Sierpinski_arrowhead_curve.exwhtm here], and experiment with [shift] +/- as noted below.
<!--<lang Phix>(phixonline)-->
--
<span style="color: #000080;font-style:italic;">--
-- Draws curves lo to hi (simultaneously), initially {6,6}, max {10,10}
-- demo\rosetta\Sierpinski_arrowhead_curve.exw
-- Press +/- to change hi, shift +/- to change lo.
-- ===========================================
-- ("=_" are also mapped to "+-", for the non-numpad +/-)
--
-- Draws curves lo to hi (simultaneously), initially {6,6}, max {10,10}, min {1,1}
include pGUI.e
-- Press +/- to change hi, shift +/- to change lo.
 
-- ("=_" are also mapped to "+-", for the non-numpad +/-)
Ihandle dlg, canvas
--</span>
cdCanvas cddbuffer, cdcanvas
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
 
<span style="color: #008080;">include</span> <span style="color: #000000;">pGUI</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
integer width, height,
lo = 6, hi = 6
<span style="color: #004080;">Ihandle</span> <span style="color: #000000;">dlg</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">canvas</span>
atom cx, cy, h, theta
<span style="color: #004080;">cdCanvas</span> <span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">cdcanvas</span>
 
integer iy = +1
<span style="color: #004080;">integer</span> <span style="color: #000000;">width</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">height</span><span style="color: #0000FF;">,</span>
 
<span style="color: #000000;">lo</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">6</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">hi</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">6</span>
procedure draw_line(atom l)
<span style="color: #004080;">atom</span> <span style="color: #000000;">cx</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">cy</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">h</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">theta</span>
cdCanvasVertex(cddbuffer, cx-width/2+h, (height-cy)*iy+2*h)
cx += l*cos(theta*CD_DEG2RAD)
<span style="color: #004080;">integer</span> <span style="color: #000000;">iy</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">+</span><span style="color: #000000;">1</span>
cy += l*sin(theta*CD_DEG2RAD)
end procedure
<span style="color: #008080;">procedure</span> <span style="color: #000000;">draw_line</span><span style="color: #0000FF;">(</span><span style="color: #004080;">atom</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">)</span>
 
<span style="color: #7060A8;">cdCanvasVertex</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">cx</span><span style="color: #0000FF;">-</span><span style="color: #000000;">width</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span><span style="color: #0000FF;">+</span><span style="color: #000000;">h</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">height</span><span style="color: #0000FF;">-</span><span style="color: #000000;">cy</span><span style="color: #0000FF;">)*</span><span style="color: #000000;">iy</span><span style="color: #0000FF;">+</span><span style="color: #000000;">2</span><span style="color: #0000FF;">*</span><span style="color: #000000;">h</span><span style="color: #0000FF;">)</span>
procedure turn(integer angle)
<span style="color: #000000;">cx</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">cos</span><span style="color: #0000FF;">(</span><span style="color: #000000;">theta</span><span style="color: #0000FF;">*</span><span style="color: #004600;">CD_DEG2RAD</span><span style="color: #0000FF;">)</span>
theta = mod(theta+angle,360)
<span style="color: #000000;">cy</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">sin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">theta</span><span style="color: #0000FF;">*</span><span style="color: #004600;">CD_DEG2RAD</span><span style="color: #0000FF;">)</span>
end procedure
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
 
procedure curve(integer order, atom l, integer angle)
<span style="color: #008080;">procedure</span> <span style="color: #000000;">turn</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">angle</span><span style="color: #0000FF;">)</span>
if order=0 then
<span style="color: #000000;">theta</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">mod</span><span style="color: #0000FF;">(</span><span style="color: #000000;">theta</span><span style="color: #0000FF;">+</span><span style="color: #000000;">angle</span><span style="color: #0000FF;">,</span><span style="color: #000000;">360</span><span style="color: #0000FF;">)</span>
draw_line(l)
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
else
curve(order-1, l/2, -angle)
<span style="color: #008080;">procedure</span> <span style="color: #000000;">curve</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">order</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">atom</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">angle</span><span style="color: #0000FF;">)</span>
turn(angle)
<span style="color: #008080;">if</span> <span style="color: #000000;">order</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
curve(order-1, l/2, angle)
<span style="color: #000000;">draw_line</span><span style="color: #0000FF;">(</span><span style="color: #000000;">l</span><span style="color: #0000FF;">)</span>
turn(angle)
<span style="color: #008080;">else</span>
curve(order-1, l/2, -angle)
<span style="color: #000000;">curve</span><span style="color: #0000FF;">(</span><span style="color: #000000;">order</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">angle</span><span style="color: #0000FF;">)</span>
end if
<span style="color: #000000;">turn</span><span style="color: #0000FF;">(</span><span style="color: #000000;">angle</span><span style="color: #0000FF;">)</span>
end procedure
<span style="color: #000000;">curve</span><span style="color: #0000FF;">(</span><span style="color: #000000;">order</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">angle</span><span style="color: #0000FF;">)</span>
 
<span style="color: #000000;">turn</span><span style="color: #0000FF;">(</span><span style="color: #000000;">angle</span><span style="color: #0000FF;">)</span>
procedure sierpinski_arrowhead_curve(integer order, atom l)
<span style="color: #000000;">curve</span><span style="color: #0000FF;">(</span><span style="color: #000000;">order</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">angle</span><span style="color: #0000FF;">)</span>
-- If order is even we can just draw the curve.
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
if and_bits(order,1)=0 then
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
curve(order, l, +60)
else -- order is odd
<span style="color: #008080;">procedure</span> <span style="color: #000000;">sierpinski_arrowhead_curve</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">order</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">atom</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">)</span>
turn( +60)
<span style="color: #000080;font-style:italic;">-- If order is even we can just draw the curve.</span>
curve(order, l, -60)
<span style="color: #008080;">if</span> <span style="color: #7060A8;">and_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">order</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
end if
<span style="color: #000000;">curve</span><span style="color: #0000FF;">(</span><span style="color: #000000;">order</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">+</span><span style="color: #000000;">60</span><span style="color: #0000FF;">)</span>
draw_line(l)
<span style="color: #008080;">else</span> <span style="color: #000080;font-style:italic;">-- order is odd</span>
end procedure
<span style="color: #000000;">turn</span><span style="color: #0000FF;">(</span> <span style="color: #0000FF;">+</span><span style="color: #000000;">60</span><span style="color: #0000FF;">)</span>
 
<span style="color: #000000;">curve</span><span style="color: #0000FF;">(</span><span style="color: #000000;">order</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">l</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">-</span><span style="color: #000000;">60</span><span style="color: #0000FF;">)</span>
function redraw_cb(Ihandle /*ih*/, integer /*posx*/, integer /*posy*/)
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
{width, height} = IupGetIntInt(canvas, "DRAWSIZE")
<span style="color: #000000;">draw_line</span><span style="color: #0000FF;">(</span><span style="color: #000000;">l</span><span style="color: #0000FF;">)</span>
cdCanvasActivate(cddbuffer)
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
for order=lo to hi do
cx = width/2
<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: #000080;font-style:italic;">/*posy*/</span><span style="color: #0000FF;">)</span>
cy = height
<span style="color: #0000FF;">{</span><span style="color: #000000;">width</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">height</span><span style="color: #0000FF;">}</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>
h = cx/2
<span style="color: #7060A8;">cdCanvasActivate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">)</span>
theta = 0
<span style="color: #008080;">for</span> <span style="color: #000000;">order</span><span style="color: #0000FF;">=</span><span style="color: #000000;">lo</span> <span style="color: #008080;">to</span> <span style="color: #000000;">hi</span> <span style="color: #008080;">do</span>
iy = iff(and_bits(order,1)?-1:+1)
<span style="color: #000000;">cx</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">width</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span>
cdCanvasBegin(cddbuffer, CD_OPEN_LINES)
<span style="color: #000000;">cy</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">height</span>
sierpinski_arrowhead_curve(order, cx)
<span style="color: #000000;">h</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cx</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span>
cdCanvasEnd(cddbuffer)
<span style="color: #000000;">theta</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
end for
<span style="color: #000000;">iy</span> <span style="color: #0000FF;">=</span> <span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">and_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">order</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)?-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">:+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
cdCanvasFlush(cddbuffer)
<span style="color: #7060A8;">cdCanvasBegin</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">,</span> <span style="color: #004600;">CD_OPEN_LINES</span><span style="color: #0000FF;">)</span>
return IUP_DEFAULT
<span style="color: #000000;">sierpinski_arrowhead_curve</span><span style="color: #0000FF;">(</span><span style="color: #000000;">order</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">cx</span><span style="color: #0000FF;">)</span>
end function
<span style="color: #7060A8;">cdCanvasEnd</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">)</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
function map_cb(Ihandle ih)
<span style="color: #7060A8;">cdCanvasFlush</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cddbuffer</span><span style="color: #0000FF;">)</span>
cdcanvas = cdCreateCanvas(CD_IUP, ih)
<span style="color: #008080;">return</span> <span style="color: #004600;">IUP_DEFAULT</span>
cddbuffer = cdCreateCanvas(CD_DBUFFER, cdcanvas)
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
cdCanvasSetBackground(cddbuffer, CD_WHITE)
cdCanvasSetForeground(cddbuffer, CD_BLUE)
<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>
return IUP_DEFAULT
<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>
end function
<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>
function key_cb(Ihandle /*ih*/, atom c)
<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_BLUE</span><span style="color: #0000FF;">)</span>
if c=K_ESC then return IUP_CLOSE end if
<span style="color: #008080;">return</span> <span style="color: #004600;">IUP_DEFAULT</span>
if find(c,"+=-_") then
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
bool bShift = IupGetInt(NULL,"SHIFTKEY")
if c='+' or c='=' then
<span style="color: #008080;">function</span> <span style="color: #000000;">key_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;">atom</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">)</span>
if bShift then
<span style="color: #008080;">if</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #004600;">K_ESC</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #004600;">IUP_CLOSE</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
lo = min(lo+1,hi)
<span style="color: #008080;">if</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #000000;">c</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"+=-_"</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
else
<span style="color: #004080;">bool</span> <span style="color: #000000;">bShift</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">IupGetInt</span><span style="color: #0000FF;">(</span><span style="color: #004600;">NULL</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"SHIFTKEY"</span><span style="color: #0000FF;">)</span>
hi = min(10,hi+1)
<span style="color: #008080;">if</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #008000;">'+'</span> <span style="color: #008080;">or</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #008000;">'='</span> <span style="color: #008080;">then</span>
end if
<span style="color: #008080;">if</span> <span style="color: #000000;">bShift</span> <span style="color: #008080;">then</span>
elsif c='-' or c='_' then
<span style="color: #000000;">lo</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">min</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lo</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hi</span><span style="color: #0000FF;">)</span>
if bShift then
<span lo style="color: max(1,lo-1)#008080;">else</span>
<span style="color: #000000;">hi</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">min</span><span style="color: #0000FF;">(</span><span style="color: #000000;">10</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hi</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
else
<span style="color: #008080;">end</span> hi<span style="color: max(lo,hi-1)#008080;">if</span>
<span style="color: #008080;">elsif</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #008000;">'-'</span> <span style="color: #008080;">or</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">=</span><span style="color: #008000;">'_'</span> <span style="color: #008080;">then</span>
end if
<span style="color: #008080;">if</span> <span style="color: #000000;">bShift</span> <span style="color: #008080;">then</span>
end if
<span style="color: #000000;">lo</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">max</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">lo</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
IupSetStrAttribute(dlg, "TITLE", "Sierpinski arrowhead curve (%d..%d)",{lo,hi})
<span style="color: #008080;">else</span>
cdCanvasClear(cddbuffer)
<span style="color: #000000;">hi</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">max</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lo</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hi</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
IupUpdate(canvas)
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
return IUP_CONTINUE
<span style="color: #7060A8;">IupSetStrAttribute</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;">"Sierpinski arrowhead curve (%d..%d)"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">lo</span><span style="color: #0000FF;">,</span><span style="color: #000000;">hi</span><span style="color: #0000FF;">})</span>
end function
<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: #7060A8;">IupUpdate</span><span style="color: #0000FF;">(</span><span style="color: #000000;">canvas</span><span style="color: #0000FF;">)</span>
procedure main()
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
IupOpen()
<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>
canvas = IupCanvas(NULL)
IupSetAttribute(canvas, "RASTERSIZE", "770x770")
<span style="color: #008080;">procedure</span> <span style="color: #000000;">main</span><span style="color: #0000FF;">()</span>
IupSetCallback(canvas, "MAP_CB", Icallback("map_cb"))
<span style="color: #7060A8;">IupOpen</span><span style="color: #0000FF;">()</span>
IupSetCallback(canvas, "ACTION", Icallback("redraw_cb"))
 
<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>
dlg = IupDialog(canvas)
<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;">"770x770"</span><span style="color: #0000FF;">)</span>
IupSetAttribute(dlg, "TITLE", "Sierpinski arrowhead curve (6..6)")
<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>
IupSetCallback(dlg, "K_ANY", Icallback("key_cb"))
<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>
 
IupMap(dlg)
<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>
IupShowXY(dlg,IUP_CENTER,IUP_CENTER)
<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;">"Sierpinski arrowhead curve (6..6)"</span><span style="color: #0000FF;">)</span>
IupMainLoop()
<span style="color: #7060A8;">IupSetCallback</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"K_ANY"</span><span style="color: #0000FF;">,</span> <span style="color: #7060A8;">Icallback</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"key_cb"</span><span style="color: #0000FF;">))</span>
IupClose()
end procedure
<span style="color: #7060A8;">IupMap</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">)</span>
 
<span style="color: #7060A8;">IupShowXY</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dlg</span><span style="color: #0000FF;">,</span><span style="color: #004600;">IUP_CENTER</span><span style="color: #0000FF;">,</span><span style="color: #004600;">IUP_CENTER</span><span style="color: #0000FF;">)</span>
main()</lang>
<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>
<!--</lang>-->
 
=={{header|Processing}}==
Petelomax
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edits

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