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- #include <windows.h>
- #include <math.h>
- void MyGraph(HWND hwnd, HDC hdc);
- float f(float x);
- int NX(float x);
- int NY(float y);
- float xmin=0, xmax= 3*M_PI, ymin = -10, ymax=10;
- float Nxmin =100, Nxmax =1000, Nymin=100, Nymax=800;
- float x,y;
- /* Declare Windows procedure */
- LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
- /* Make the class name into a global variable */
- char szClassName[ ] = "WindowsApp";
- int WINAPI WinMain (HINSTANCE hThisInstance,
- HINSTANCE hPrevInstance,
- LPSTR lpszArgument,
- int nFunsterStil)
- {
- HWND hwnd; /* This is the handle for our window */
- MSG messages; /* Here messages to the application are saved */
- WNDCLASSEX wincl; /* Data structure for the windowclass */
- /* The Window structure */
- wincl.hInstance = hThisInstance;
- wincl.lpszClassName = szClassName;
- wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
- wincl.style = CS_DBLCLKS; /* Catch double-clicks */
- wincl.cbSize = sizeof (WNDCLASSEX);
- /* Use default icon and mouse-pointer */
- wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
- wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
- wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
- wincl.lpszMenuName = NULL; /* No menu */
- wincl.cbClsExtra = 0; /* No extra bytes after the window class */
- wincl.cbWndExtra = 0; /* structure or the window instance */
- /* Use Windows's default color as the background of the window */
- wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
- /* Register the window class, and if it fails quit the program */
- if (!RegisterClassEx (&wincl))
- return 0;
- /* The class is registered, let's create the program*/
- hwnd = CreateWindowEx (
- 0, /* Extended possibilites for variation */
- szClassName, /* Classname */
- "Windows App", /* Title Text */
- WS_OVERLAPPEDWINDOW, /* default window */
- CW_USEDEFAULT, /* Windows decides the position */
- CW_USEDEFAULT, /* where the window ends up on the screen */
- 544, /* The programs width */
- 375, /* and height in pixels */
- HWND_DESKTOP, /* The window is a child-window to desktop */
- NULL, /* No menu */
- hThisInstance, /* Program Instance handler */
- NULL /* No Window Creation data */
- );
- /* Make the window visible on the screen */
- ShowWindow (hwnd, nFunsterStil);
- /* Run the message loop. It will run until GetMessage() returns 0 */
- while (GetMessage (&messages, NULL, 0, 0))
- {
- /* Translate virtual-key messages into character messages */
- TranslateMessage(&messages);
- /* Send message to WindowProcedure */
- DispatchMessage(&messages);
- }
- /* The program return-value is 0 - The value that PostQuitMessage() gave */
- return messages.wParam;
- }
- /* This function is called by the Windows function DispatchMessage() */
- LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- HDC hdc;
- PAINTSTRUCT ps;
- switch (message) /* handle the messages */
- {
- case WM_DESTROY:
- PostQuitMessage (0); /* send a WM_QUIT to the message queue */
- break;
- case WM_PAINT:
- hdc = BeginPaint(hwnd, &ps);
- MyGraph(hwnd, hdc);
- break;
- default: /* for messages that we don't deal with */
- return DefWindowProc (hwnd, message, wParam, lParam);
- }
- return 0;
- }
- //------------------------------------------------------------------------------
- void MyGraph(HWND hwnd, HDC hdc)
- {
- float dx=0.1;
- MoveToEx(hdc,NX(xmin),NY(f(xmin)),NULL);
- for (x=xmin;x<xmax;x+=dx)
- {
- LineTo(hdc,NX(x),NY(f(x)));
- }
- MoveToEx(hdc,NX(0),NY(ymin),NULL);
- LineTo(hdc,NX(0),NY(ymax));
- MoveToEx(hdc,NX(xmin),((NX(xmax)-NX(xmin))/2),NULL);
- LineTo(hdc,NX(xmax),((NX(xmax)-NX(xmin))/2));
- }
- int NX(float x)
- {
- return (int)(((x-xmin)/(xmax-xmin))*(Nxmax-Nxmin)+Nxmin);
- }
- int NY(float y)
- {
- return (int)(((y-ymin)/(ymax-ymin))*(Nymin-Nymax)+Nymax);
- }
- float f(float x)
- {
- float max=1;
- float min=1;
- float m;
- // return sqrt(x)*cos(4*x);
- if (m>y)
- {
- max=m;
- }
- if (m<min)
- {
- min=m;
- }
- m=sqrt(x)*cos(x*10);
- return m ;
- }
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