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program example2;
uses video,keyboard;
Var
P,PP,D : Integer;
K: TKeyEvent;
Procedure PutSquare (P : INteger; C : Char);
begin
VideoBuf^[P]:=Ord(C)+($07 shl 8);
VideoBuf^[P+ScreenWidth]:=Ord(c)+($07 shl 8);
VideoBuf^[P+1]:=Ord(c)+($07 shl 8);
VideoBuf^[P+ScreenWidth+1]:=Ord(c)+($07 shl 8);
end;
begin
InitVideo;
InitKeyBoard;
P:=0;
PP:=-1;
Repeat
If PP<>-1 then
PutSquare(PP,' ');
PutSquare(P,'#');
SetCursorPos(P Mod ScreenWidth,P div ScreenWidth);
UpdateScreen(False);
PP:=P;
Repeat
D:=0;
K:=TranslateKeyEvent(GetKeyEvent);
Case GetKeyEventCode(K) of
kbdLeft : If (P Mod ScreenWidth)<>0 then
D:=-1;
kbdUp : If P>=ScreenWidth then
D:=-ScreenWidth;
kbdRight : If ((P+2) Mod ScreenWidth)<>0 then
D:=1;
kbdDown : if (P<(VideoBufSize div 2)-(ScreenWidth*2)) then
D:=ScreenWidth;
end;
Until (D<>0) or (GetKeyEventChar(K)='q');
P:=P+D;
until GetKeyEventChar(K)='q';
DoneKeyBoard;
DoneVideo;
end.
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