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| #include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <cmath>
#define PI 3.14
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int windowwidth = 660, windowheight = 540;
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow) {
WNDCLASSEX wcex;
LPCSTR szWindowClass = "myclass";
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(0);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
if (!RegisterClassEx(&wcex)) {
MessageBox(NULL, "Call to RegisterClassEx failed!", "Win32 Guided Tour",NULL);
return 1;
}
HINSTANCE hInst = hInstance;
HWND hWnd = CreateWindow(szWindowClass,
"Graph",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
windowwidth, windowheight,
NULL,
NULL,
hInstance,
NULL
);
if (!hWnd) {
MessageBox(NULL,
_T("Call to CreateWindow failed!"),
_T("Win32 Guided Tour"),
NULL);
return 1;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
// Main message loop:
MSG msg;
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int) msg.wParam;
}
float y(float x) {
if ( x<0 )
return x * x;
else
if (x <= 2.5)
return 1 +3 * log(abs(1 - x * x * x));
else
return cos(2.3 * x - 1);
}
float round(float d) {
return floor(d + 0.5);
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
PAINTSTRUCT ps;
HDC hdc = GetDC(hWnd);
RECT r;
GetWindowRect(hWnd, &r);
float a = 0, b = 0, x = 0, h = 0, max = 0, min = 0, mx = 0, my = 0, dx = 0;
int x0 = 0, y0 = 0, i = 0, n = 0;
a = -PI / 4;
b = 7 * PI / 4;
h = PI / 4;
x = a;
int pos = 0;
switch (message) {
case WM_PAINT:
BeginPaint(hWnd, &ps);
while (x <= b) {
char msg[200] = {0};
strcpy(msg, "x=");
char num[32];
sprintf(num, "%5.2g", x);
strcat(msg, num);
strcat(msg, " y=");
memset(num, 0, sizeof(num));
sprintf(num, "%7.3g", y(x));
strcat(msg, num);
TextOut(hdc, 0, pos, msg, _tcslen(msg));
pos += 20;
x = x + h;
}
TextOut(hdc, 0, pos, "Нажмите Enter для просмотра графика", _tcslen("Нажмите Enter для просмотра графика"));
EndPaint(hWnd, &ps);
break;
case WM_KEYDOWN:
if (wParam == VK_RETURN) {
BeginPaint(hWnd, &ps);
x0 = round(-windowwidth * a / (b - a));
y0 = windowheight / 2;
mx = (windowwidth-50) / (b - a); // масштаб по Х
x = a;
max = y(x);
min = max;
while (x < b) {
x = x + 0.01;
if (y(x) > max)
max = y(x);
if (y(x) < min)
min = y(x);
}
if (max > abs(min))
my = (y0 + 20) / max; // масштаб по Y
else
my = (y0 + 20) / abs(min);
n = 7;
if (max > n)
n = int(max) + 1;
if (abs(min) > n)
n = int(abs(min)) + 1;
MoveToEx(hdc, 0, y0, NULL);
LineTo(hdc, windowwidth, y0);
MoveToEx(hdc, x0, 0, NULL);
LineTo(hdc, x0, windowheight);
for (i = 1; i <= n; ++i) { // максимальное количество засечек в одну сторону
MoveToEx(hdc, x0 + round(i * PI * mx / 4), y0 - 3, NULL);
LineTo(hdc, x0 + round(i * PI * mx / 4), y0 + 3);
MoveToEx(hdc, x0 - round(i * PI * mx / 4),y0 - 3, NULL);
LineTo(hdc, x0 - round(i * PI * mx / 4), y0 + 3);
MoveToEx(hdc, x0 + 3, y0 - round(i * my), NULL);
LineTo(hdc, x0 - 3, y0-round(i * my));
MoveToEx(hdc, x0 + 3, y0 + round(i * my), NULL);
LineTo(hdc, x0 - 3, y0 + round(i * my));
// подпись оси Х
if (i == 1) {
TextOut(hdc, x0 + round(mx * PI / 4) - 15, y0 + 10, "pi/4", _tcslen("pi/4"));
TextOut(hdc, x0 - round(mx * PI / 4) - 15, y0 + 10, "-pi/4", _tcslen("-pi/4"));
} else {
char msg[20] = {0};
char num[32] = {0};
sprintf(num, "%d", i);
strcpy(msg, num);
strcat(msg, "pi/4");
TextOut(hdc, x0 + round(mx * i * PI / 4) - 15, y0 + 10, msg, _tcslen(msg));
memset(num, 0, sizeof(num));
sprintf(num, "%d", -i);
strcpy(msg, num);
strcat(msg, "pi/4");
TextOut(hdc, x0 - round(mx * i * PI / 4), y0 + 10, msg, _tcslen(msg));
}
// подписи по оси Y
char s[32] = {0};
sprintf(s, "%d", i);
TextOut(hdc, x0 - 25, y0 - round(i * my) - 10, s, _tcslen(s));
char msg[20] = {0};
strcpy(msg, "-");
strcat(msg, s);
TextOut(hdc, x0 - 30, y0 + round(i * my) - 10, msg, _tcslen(msg));
}
// центр
TextOut(hdc, x0 + 5, y0 + 10, "0", _tcslen("0"));
// подписи концов осей
TextOut(hdc, windowwidth - 15, y0 - 25, "X", _tcslen("X"));
TextOut(hdc, x0 + 5, 8, "Y", _tcslen("Y"));
// график
x = a;
dx = 0.001;
while (x <= b) {
x = x + dx;
SetPixel(hdc, x0 + round(x * mx), y0 - round(y(x) * my), RGB(0, 0, 255));
}
SetTextColor(hdc, RGB(0, 0, 255));
TextOut(hdc, x0 + 250, 10, " x<0 y=x^2", _tcslen(" x<0 y=x^2"));
TextOut(hdc, x0 + 250, 30, " 0<=x<=2.5 y=1+3*ln|1-x*x*x|", _tcslen(" 0<=x<=2.5 y=1+3*ln|1-x*x*x|"));
TextOut(hdc, x0 + 250, 50, " x>2.5 y=cos(2.3*x-1)", _tcslen(" x>2.5 y=cos(2.3*x-1)"));
EndPaint(hWnd, &ps);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
break;
}
ReleaseDC(hWnd, hdc);
return 0;
} |
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