//PascalABC.NET
uses graphABC;
const W = 600; H = 600;
function F(x: real): real;
begin
F := 1 / x;
end;
var
x0, y0, x, y, xLeft, yLeft, xRight, yRight, n: integer;
a, b, fmin, fmax, x1, y1, mx, my, dx, dy, num: real;
i: byte;
s: string;
begin
SetWindowSize(W, H);
xLeft := 10;
yLeft := 10;
xRight := W - 10;
yRight := H - 10;
a := -5; b := 5; dx := 1;
fmin := -5; fmax := 5; dy := 1;
mx := (xRight - xLeft) / (b - a);
my := (yRight - yLeft) / (fmax - fmin);
x0 := trunc(abs(a) * mx) + xLeft;
y0 := H div 2;
line(xLeft, y0, xRight + 10, y0);
line(x0, yLeft - 10, x0, yRight);
SetFontSize(12);
SetFontColor(clBlue);
TextOut(xRight + 20, y0 - 15, 'X');
TextOut(x0 - 10, yLeft - 30, 'Y');
SetFontSize(8);
SetFontColor(clRed);
n := round((b - a) / dx) + 1;
for i := 1 to n do
begin
num := a + (i - 1) * dx;
x := xLeft + trunc(mx * (num - a));
Line(x, y0 - 3, x, y0 + 3);
str(Num:0:0, s);
if abs(num) > 1E-15 then
TextOut(x - TextWidth(s) div 2, y0 + 10, s)
end;
n := round((fmax - fmin) / dy) + 1;
for i := 1 to n do
begin
num := fMin + (i - 1) * dy;
y := yRight - trunc(my * (num - fmin));
Line(x0 - 3, y, x0 + 3, y);
str(num:0:0, s);
if abs(num) > 1E-15 then
TextOut(x0 + 7, y - TextHeight(s) div 2, s)
end;
TextOut(x0 - 10, y0 + 10, '0');
x1 := a;
while x1 <= b do<br> begin
x := x0 + round(x1 * mx);
y1 := F(x1);
if y < H then y := y0 - round(y1 * my);
if (y >= yLeft) and (y <= yRight) then SetPixel(W - x, H - y, clGreen);<br> if (y >= yLeft) and (y <= yRight) then SetPixel(x, y, clGreen); <br> x1 := x1 + 0.001;
end;
end.