function checkMove(key1:char):boolean;
begin
if key1=#0 then begin
case key1 of
chr(75):
begin
if pile[pacY][pacX-1].isitwall=false then checkmove:=true else checkmove:=false;
end;
chr(77):
begin
if pile[pacY][pacX+1].isitwall=false then checkmove:=true else checkmove:=false;
end;
chr(72):
begin
if pile[pacY-1][pacX].isitwall=false then checkmove:=true else checkmove:=false;
end;
chr(80):
begin
if pile[pacY+1][pacX].isitwall=false then checkmove:=true else checkmove:=false;
end;
end;
end;
end;
function readInput():char;
begin
if keypressed then key:=readkey;
begin
if key=#0 then begin
if checkmove(key)=true then key:=readkey
else key:=previouskey;
end;
case key of
chr(75):
begin
if pile[pacY][pacX-1].isitwall=false then
begin
readInput:='a'; // lewo
pacX:=pacX-1;
end;
end;
chr(77):
begin
if pile[pacY][pacX+1].isitwall=false then
begin
readInput:='d';
pacX:=pacX+1; // prawo
end else readinput:=previouskey;
end;
chr(72):
begin
if pile[pacY-1][pacX].isitwall=false then
begin
readInput:='w'; //gora
pacY:=pacY-1;
end;
end;
chr(80):
begin
if pile[pacY+1][pacX].isitwall=false then
begin
readInput:='s'; //dol
pacY:=pacY+1;
end;
end;
end;
end;
writeln(key,' ',previouskey);
previouskey:=key;
end;
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