Tracé de courbe dans un repère

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program courbe;
uses wincrt;
var
t,tm:longint;
xe,i,r,j,x1,x2,x3,x4:integer;
procedure echelle;
begin
for i:=1 to 24 do
writeln('|');
gotoxy(1,12);
for i:=1 to 70 do
write('-');
end;
 
procedure p1;
begin
for i:=12 downto 4 do
begin
gotoxy(x1,i);
write('.');
x1:=x1+1;
for t:=1 to tm do;
end;
end;
 
procedure p2;
begin
for i:=4 to 12 do
begin
gotoxy(x1,i);
write('.');
x1:=x1+1;
for t:=1 to tm do;
end;
 
end;
procedure p3;
begin
for i:=12 to 20 do
begin
gotoxy(x1,i);
write('.');
x1:=x1+1;
for t:=1 to tm do;
end;
 
end;
procedure p4;
begin
for i:=20 downto 12 do
begin
gotoxy(x1,i);
write('.');
x1:=x1+1;
for t:=1 to tm do;
end;
 
end;
 
 
 
begin
echelle;
tm:=4000000;
 
 
gotoxy(2,4);
for i:=1 to 70 do
begin
for t:=2 to tm do;
write('-');
end;
gotoxy(74,4);
write('max=8');
 
gotoxy(2,20);
for i:=1 to 70 do
begin
for t:=2 to tm do;
write('-');
end;
gotoxy(74,20);
write('-max=-8');
 
 
x1:=1;
x2:=4;
x3:=9;
x4:=14;
 
r:=0;
repeat
p1;
p2;
x1:=x1-1;
p3;
p4;
x1:=x1-1;
r:=r+1;
until r=2;
 
 
gotoxy(1,12);
for t:=1 to tm*6 do;
write('0');
 
gotoxy(9,12);
for t:=1 to tm*6 do;
write('1');
 
gotoxy(18,12);
for t:=1 to tm*6 do;
write('2');
 
gotoxy(28,12);
for t:=1 to tm*6 do;
write('3');
 
gotoxy(35,12);
for t:=1 to tm*6 do;
write('4');
 
gotoxy(44,12);
for t:=1 to tm*6 do;
write('5');
 
gotoxy(52,12);
for t:=1 to tm*6 do;
write('6');
 
gotoxy(61,12);
for t:=1 to tm*6 do;
write('7');
 
gotoxy(69,12);
for t:=1 to tm*6 do;
write('8');
 
 
end.