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Amiga Plus 1995 #5 & #6
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Amiga Plus CD - 1995 - No. 5 and 6.iso
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serien
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purity
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nr.48
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apfel
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apfel.p
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1995-06-23
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97 lines
PROGRAM Apfel2D;
(* This great program creates 2D Apfelmännchen on your screen
It is not very fast, but easy to understand. If you want to contact
me: Daniel Amor <daniel.amor@student.uni-tuebingen.de>. Play around
with the constants to create another picture! *)
USES Graphics, Intuition;
CONST ru=-2; (* Gauss-Parameter *)
ro=0.5; (* Gauss-Parameter *)
iu=-1.25; (* Gauss-Parameter *)
io=1.25; (* Gauss-Parameter *)
nm=100; (* max Iteration *)
xr=0.1; (* X *)
yi=0.5; (* Y *)
xm=639; (* x-zoom factor *)
ym=199; (* y-zoom factor *)
ax=639; (* X-dimension, depending on your window *)
ay=199; (* Y-dimension, depending on your window *)
VAR x,y,r,i,d,a,b,da,db : REAL;
win : p_Window;
msg : p_IntuiMessage;
loop : BOOLEAN;
U,v,n : INTEGER
ok : LONGINT;
FUNCTION md(x: INTEGER): INTEGER;
BEGIN
md:=x-TRUNC(x/3)*3;
END;
BEGIN
win:=Open_Window(0,0,640,200,1,_CLOSEWINDOW,WINDOWDEPTH OR WINDOWDRAG OR ACTIVATE OR WINDOWCLOSE,"Mini-Apfel 2D",NIL,0,0,0,0);
(* it's so easy to open a window *)
da:=(ro-ru)/xm;
db:=(io-iu)/ym;
b:=iu-db
FOR U:=11 TO ay-4 DO
BEGIN
b:=b+db;
a:=ru-da;
FOR v:=4 TO ax-4 DO
BEGIN
a:=a+da;
n:=0;
r:=xr;
i:=yi;
d:=0;
loop:=FALSE;
REPEAT
IF d<4 THEN
BEGIN
x:=r;
y:=i;
r:=x*x-y*y+a;
i:=2*x*y+b;
d:=r*r+i*i;
INC(N);
IF n=nm THEN loop:=TRUE;
END
ELSE
BEGIN
loop:=TRUE;
END;
UNTIL loop
IF n=nm THEN
BEGIN
SetAPen(Win^.RPort,1);
ok:=WritePixel(Win^.RPort,v,U);
END
ELSE
BEGIN
SetAPen(Win^.RPort,md(n)+1);
ok:=WritePixel(Win^.RPort,v,U);
END;
END;
END;
(* This is the main Apfelmaennchen-Routine *)
Msg:=NIL;
REPEAT
IF Msg<>NIL THEN Reply_Msg(Msg);
Msg:=Wait_Port(Win^.UserPort);
Msg:=Get_Msg(Win^.UserPort);
UNTIL Msg^.Class = _CLOSEWINDOW;
(* Waits until you press the Close-Gadget *)
END.