#include <windows.h>
#include <math.h>

//using namespace std;

HPEN Piora[2];

LRESULT CALLBACK Proc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam){
    switch(msg){
        case WM_PAINT:{
            PAINTSTRUCT PS;
            BeginPaint(hWnd,&PS);

            RECT R, E;
            GetClientRect(hWnd,&R);

            SetMapMode(PS.hdc,MM_ISOTROPIC);
            SetWindowExtEx(PS.hdc,(R.right-R.left),(R.bottom-R.top),NULL);
            SetViewportExtEx(PS.hdc,R.right,R.bottom,NULL);
            SetViewportOrgEx(PS.hdc,R.right/2,R.bottom/2,NULL);

            E.left = R.left + (R.right-R.left)/100;
            E.right = R.right - (R.right-R.left)/100;
            E.top = R.top + (R.bottom-R.top)/100;
            E.bottom = R.bottom - (R.bottom-R.top)/100;

            SelectObject(PS.hdc,Piora[0]);

            MoveToEx(PS.hdc,0, -(E.bottom-E.top)/2,NULL);
            LineTo(PS.hdc,0,(E.bottom-E.top)/2);

            MoveToEx(PS.hdc, -( ( E.right - E.left ) / 2 ), 0, NULL );
            LineTo( PS.hdc, ( E.right - E.left ) / 2, 0 );

            SelectObject(PS.hdc,Piora[1]);
            float ytan;
            float ytans;

            for(float punkt = -(E.right-E.left)/2; punkt <= E.right-E.left ; punkt++){
                ytan = 100 * tan(punkt*3.14/180);
                ytans = 100 * tan((punkt-4)*3.14/180);

                //MoveToEx(PS.hdc,punkt,ytan,NULL);
                //LineTo(PS.hdc,punkt-4,ytans);
                SetPixel(PS.hdc,punkt,ytan,RGB(0,255,0));

            }



            EndPaint(hWnd,&PS);
                      } break;

        case WM_DESTROY:{
            PostQuitMessage(0);
                        } break;

        default: return DefWindowProc(hWnd, msg, wParam, lParam); break;
    }
    return 0;
}

bool Rejestruj(){
    WNDCLASSEX w;
    w.cbClsExtra = w.cbWndExtra = 0;
    w.cbSize = sizeof(WNDCLASSEX);
    w.hbrBackground = (HBRUSH) GetStockObject(BLACK_BRUSH);
    w.hCursor = LoadCursor(NULL,IDC_ARROW);
    w.hIcon = w.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    w.hInstance = GetModuleHandle(NULL);
    w.lpfnWndProc = Proc;
    w.lpszClassName = L"Klasa";
    w.lpszMenuName = NULL;
    w.style = CS_HREDRAW | CS_VREDRAW;
    return(RegisterClassEx(&w)!=0);
}

int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE XXX, LPWSTR lpCmdLine, int nShowCmd){

    Rejestruj();

    Piora[0] = CreatePen(PS_SOLID,2,0x00AAAAAA);
    Piora[1] = CreatePen(PS_SOLID,1,RGB(0,255,0));

    HWND Okno = CreateWindowEx(0,L"Klasa",L"Okno_Glowne", WS_OVERLAPPEDWINDOW | WS_VISIBLE, 30,30,600,400,0,0,hInst,0);

    MSG msg;
    while(GetMessage(&msg,0,0,0)>0){
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    UnregisterClass(L"Klasa",hInst);

    return msg.wParam;

}