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 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); if (y >= yLeft) and (y <= yRight) then SetPixel(x, y, clGreen); x1 := x1 + 0.001; end; end.
Внимание! Если программа не работает, обновите версию!
Если надо быстро, можно так:
uses GraphABC;
begin
Draw(x->1/x)
end.
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
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);
if (y >= yLeft) and (y <= yRight) then SetPixel(x, y, clGreen);
x1 := x1 + 0.001;
end;
end.