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PROGRAM Sterne;
uses Exec, Graphics, Intuition, Utility, systemvartags;
CONST MAX_STERNE = 42;
MAX_GESCHW = 15;
TYPE Star = packed Record
x,y :Integer;
msin :Real;
mcos :Real;
d :Integer;
v :Integer;
End;
VAR Scr :pScreen;
Win :pWindow;
Msg :pIntuiMessage;
Ende :Boolean;
Stars :Array[1..MAX_STERNE] of Star;
factor :Real;
col :Integer;
dum :Longint;
PROCEDURE newStern(num :Integer);
BEGIN
col:=Random(360);
Stars[num].x := Scr^.Width shr 1;
Stars[num].y := Scr^.Height shr 1;
Stars[num].msin := sin(col*factor);
Stars[num].mcos := cos(col*factor);
Stars[num].d := 0;
Stars[num].v := Random(MAX_GESCHW)+2;
END;
PROCEDURE moveStern(num :Integer);
BEGIN
Stars[num].d:=Stars[num].d+Stars[num].v;
Stars[num].x:=Round(Stars[num].d*Stars[num].msin)+Scr^.Width shr 1;
Stars[num].y:=Round(Stars[num].d*Stars[num].mcos)+Scr^.Height shr 1;
{Inc(Stars[num].v);}
END;
PROCEDURE drawSterne;
BEGIN
For dum:=1 to MAX_STERNE Do Begin
If Stars[dum].v=0 Then Begin
If Random(10)>4 Then
newStern(dum);
End Else If Stars[dum].d>Scr^.Width shr 1 Then Begin
SetAPen(Win^.RPort,0);
If WritePixel(Win^.RPort,(Stars[dum].x),(Stars[dum].y))=0 Then;
Stars[dum].v:=0;
End Else Begin
SetAPen(Win^.RPort,0);
If WritePixel(Win^.RPort,(Stars[dum].x),(Stars[dum].y))=0 Then;
moveStern(dum);
col:=(Stars[dum].d shl 5) Div Scr^.Height shr 1;
If col>7 Then
col:=7;
SetAPen(Win^.RPort,col);
If WritePixel(Win^.RPort,(Stars[dum].x),(Stars[dum].y))=0 Then;
End;
End;
END;
PROCEDURE initSterne;
BEGIN
For dum:=1 to MAX_STERNE Do begin
Stars[dum].x := Scr^.Width shr 1;
Stars[dum].y := Scr^.Height shr 1;
Stars[dum].msin := 0.0;
Stars[dum].mcos := 0.0;
Stars[dum].d := 0;
Stars[dum].v := 0;
end;
factor:=PI/180;
END;
PROCEDURE CleanUp(str:string; code : Longint);
BEGIN
If assigned(Win) Then
CloseWindow(Win);
If assigned(Scr) then CloseScreen(Scr);
if str <> '' then writeln(str);
Halt(code);
END;
PROCEDURE Init;
BEGIN
Scr:=Nil; Win:=Nil;
Scr := OpenScreenTags(NIL,[
SA_Depth, 3,
SA_DisplayID, HIRES_KEY,
TAG_END]);
If Scr=Nil Then CleanUp('No screen',20);
Win:=OpenWindowTags(Nil, [
WA_Flags, WFLG_BORDERLESS,
WA_IDCMP, IDCMP_MOUSEBUTTONS,
WA_CustomScreen, Scr,
TAG_DONE]);
If Win=Nil Then CleanUp('No window',20);
initSterne;
SetRGB4(@Scr^.ViewPort, 0, $0,$0,$0);
SetRGB4(@Scr^.ViewPort, 1, $3,$3,$3);
SetRGB4(@Scr^.ViewPort, 2, $6,$6,$6);
SetRGB4(@Scr^.ViewPort, 3, $b,$b,$b);
SetRGB4(@Scr^.ViewPort, 4, $c,$c,$c);
SetRGB4(@Scr^.ViewPort, 5, $d,$d,$d);
SetRGB4(@Scr^.ViewPort, 6, $e,$e,$e);
SetRGB4(@Scr^.ViewPort, 7, $f,$f,$f);
END;
BEGIN
Init;
Ende:=false;
Repeat
drawSterne;
Msg:=pIntuiMessage(GetMsg(Win^.UserPort));
If Msg<>Nil Then Begin
ReplyMsg(Pointer(Msg));
Ende:=true;
End;
Until Ende;
CleanUp('',0);
END.
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