Uses
graphABC;
const
W = 800; H = 500;
function DrawSin(x: real): real;
begin
DrawSin := sin(x);
end;
function DrawCos(x: real): real;
begin
DrawCos := cos(x);
end;
var
x0, y0, x, y, xLeft, yLeft, xRight, yRight, n: integer;
a, b, fmin, fmax, x1, y1, x2, y2, mx, my, dx, dy, num: real;
i: byte;
s: string;
begin
SetWindowSize(W, H);
xLeft := 50;
yLeft := 50;
xRight := W - 50;
yRight := H - 50;
a := -10; b := 10; 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 := yRight - trunc(abs(fmin) * my);
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(7);
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:0:1, 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:0:1, 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;
x2 := a;
while x1 <= b do<br> begin
y1 := DrawSin(x1);
y2 := DrawCos(x2);
if ((x1 >= -2*pi) and (x1 <= 2*pi)) then<br> begin
x := x0 + round(x1 * mx);
y := y0 - round(y1 * my);
if (y >= yLeft) and (y <= yRight) then SetPixel(x, y, clBlue);<br>
x := x0 + round(x2 * mx);
y := y0 - round(y2 * my);
if (y >= yLeft) and (y <= yRight) then SetPixel(x, y, clGreen); <br> end;
x1 := x1 + 0.001;
x2 := x2 + 0.001;
end
end.
