Построить график функции Паскаль

uses graphABC;
function f(x:real):real;
begin
f:=2*sin(x)*exp(x)/5;
end;
var xn,xk,x,dx,m,x1,x2,x3,y:real;
    x0,y0,n,i:integer;
begin
setwindowsize(500,500);
centerwindow;
//интервал
xn:=-3;
xk:=3;
//начало координат
x0:=windowwidth div 2;
y0:=windowheight div 2;
//масштаб
if xk>=f(xk) then
 begin
  m:=(x0-20)/xk;
  n:=round(xk)
 end
else
 begin
  m:=(y0-20)/f(xk);
  n:=trunc(f(xk))+1;
 end;
//оси
line(0,y0,windowwidth,y0);
textout(windowwidth-20,y0-20,'X');
line(x0,0,x0,2*y0);
textout(x0+5,0,'Y');
textout(x0+5,y0+10,'0');
//засечки и подписи по осям
for i:=1 to n do
 begin
  line(x0+round(i*m),y0-3,x0+round(i*m),y0+3);
  line(x0-round(i*m),y0-3,x0-round(i*m),y0+3);
  textout(x0+round(i*m),y0+10,floattostr(i));
  textout(x0-round(i*m),y0+10,floattostr(-i));
  line(x0-5,y0-round(i*m),x0+5,y0-round(i*m));
  textout(x0-25,y0-round(i*m)-5,inttostr(i));
  line(x0-5,y0+round(i*m),x0+5,y0+round(i*m));
  textout(x0-25,y0+round(i*m)-5,inttostr(-i));
 end;
 //график
setpencolor(clBlue);
x:=xn;
dx:=0.01;
while x<=xk do
 begin
  if x=xn then moveto(x0+round(x*m),y0-round(f(x)*m))
  else lineto(x0+round(x*m),y0-round(f(x)*m));
  x:=x+dx;
 end;
end.