#include <windows.h>
#include <math.h>
void MyGraph(HWND hwnd);
float xmin = 0, ymax=5, xmax=5, ymin = 0;
int Nxmax = 1000, Nxmin = 500, Nymax=600, Nymin=100;
float N=100;
float f(float x);
int Nx(float x);
int Ny(float 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)GetStockObject(WHITE_BRUSH); //(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, SW_MAXIMIZE);

    /* 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)
{
    switch (message)                  /* handle the messages */
    {
        case WM_DESTROY:
            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
            break;
        case WM_PAINT:
            MyGraph(hwnd);
            break;
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}
void MyGraph(HWND hwnd)
{
    PAINTSTRUCT ps;
    HDC hdc;
    HPEN hPen;

    hdc=BeginPaint(hwnd, &ps);
    hPen=CreatePen(PS_SOLID, 2, RGB(23, 80, 11));
    SelectObject(hdc, hPen);

    MoveToEx(hdc, Nxmin, Nymax, NULL);
    LineTo(hdc, Nxmax, Nymax);
    MoveToEx(hdc, Nxmin, Nymax, NULL);
    LineTo(hdc, Nxmin, Nymin);






    float i=0;
    for(i=0;i<2*3.1415; i+=0.001){
        SetPixel(hdc, Nx(cos(i)*f(i)), Ny(sin(i)*f(i)) , RGB(0,0,0));
    }
    EndPaint(hwnd, &ps);

}
float f(float x){
    return sin(x)+0.5;
}
int Nx(float x){
    return (x-xmin)/(xmax-xmin)*(Nxmax-Nxmin)+Nxmin;
}
int Ny(float y){
    return (y-ymin)/(ymax-ymin)*(-Nymax+Nymin)+Nymax;
}