6.6 +

分形理论及算法

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<UL><PRE>{NEWTON.PAS, Newton Method 1994-02-02}
Uses Graph,Crt;
Label 30;
Var
i,np,nq,gd,gm,k: integer;
x1,y1,x,y,nx,ny,cm:real;
Function  =
dist(x,y:real):real;=A3=FB=B6=A8=D2=E5=D2=BB=B8=F6=BE=E0=C0=EB=BA=AF=CA=FD=
=A3=FD
BEGIN
dist:=3Dx*x+y*y;
END;
BEGIN
gd:=3DVGA;  gm:=3DVGAHI;
InitGraph(gd,gm,'d:\pascal');
FOR nx:=3D-160 TO 160  do
FOR ny:=3D-160 TO 160 do
BEGIN
     x:=3Dnx/80;   y:=3Dny/80;
     for k:=3D1 to 30 do
     BEGIN
       if (nx=3D0) and (ny=3D0) then goto =
30;=A3=FB=C5=C5=B3=FD(0=A3=AC0)=B5=E3=A3=FD
       cm:=3D3*dist(x,y)*dist(x,y);
       newx:=3D2*x/3+(x*x-y*y)/cm;
       newy:=3D2*y/3-2*x*y/cm;
       x:=3Dnewx; y:=3Dnewy;
     END;
     if dist(x-1,y) &lt; 0.03 then putpixel(nx+200,200-ny,2);
     if dist(x+1/2,y-sqrt(3)/2) &lt; 0.03 then =
putpixel(nx+200,200-ny,3);
     if dist(x+1/2,y+sqrt(3)/2) &lt;0.03 then putpixel(nx+200,200-ny,4);
30:
     if KeyPressed then exit;
END;
CloseGraph;
readln;
END.</PRE></UL><PRE></PRE>
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=D0<I>x</I>=BA=CD<I>y</I>=BE=F9=CE=AA=20
=B8=B4=CA=FD=A3=AC<I>r</I>=CE=AA=CA=B5=CA=FD=A3=AC=D2=B2=BF=C9=D2=D4=CE=AA=
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