SetViewportExtEx(hdc, x, y, NULL);

/**Ouvi a correção, não a rejeiteis e sede sábios. Provérbios 8:33*/

#include <windows.h>
#include "resource.h"

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hI, HINSTANCE hPI, PSTR szCmdL, int iCS) {
    static TCHAR szAppName[] = TEXT("EndJoin");
    HWND         hwnd;
    MSG          msg;
    WNDCLASS     wc;
    wc.style         = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc   = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = hI;
    wc.hIcon         = LoadIcon(hI, IDI_ICON);
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
    wc.lpszMenuName  = NULL;
    wc.lpszClassName = szAppName;

    if(!RegisterClass(&wc)) {
        MessageBox(NULL,TEXT("Requires Windows NT!"),szAppName, MB_OK);
        return 0;
    }
    hwnd = CreateWindow(
        szAppName,
        TEXT("SetViewportExtEx(hdc, x, y, NULL);"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        500,
        300,
        NULL,
        NULL,
        hI,
        NULL
    );
    ShowWindow(hwnd, iCS);
    UpdateWindow(hwnd);

    while(GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage (&msg);
        FreeConsole();
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT iMsg,WPARAM wP,LPARAM lParam) {
    static int  iEnd[] = {
        PS_ENDCAP_ROUND, PS_ENDCAP_SQUARE, PS_ENDCAP_FLAT
    };
    static int  iJoin[] = {
        PS_JOIN_ROUND,
        PS_JOIN_BEVEL,
        PS_JOIN_MITER
    };
    static int  x, y;
    HDC         hdc;
    int         i;
    LOGBRUSH    lb;
    PAINTSTRUCT ps;
    switch(iMsg) {
        case WM_SIZE:
            x = LOWORD(lParam);
            y = HIWORD(lParam);
            return 0;
        case WM_PAINT:
            hdc = BeginPaint(hwnd, &ps);
            SetMapMode(hdc, MM_ANISOTROPIC);
            SetWindowExtEx(hdc, 100, 120, NULL);
            SetViewportExtEx(hdc, x, y, NULL);
            lb.lbStyle = BS_SOLID;
            lb.lbColor = RGB(240, 88, 0);
            lb.lbHatch = 0;
            for(i = 0; i<3 ; i++) {
                SelectObject(
                    hdc,
                    ExtCreatePen(
                        PS_SOLID | PS_GEOMETRIC | iEnd[i] | iJoin[i],
                        10,
                        &lb,
                        0,
                        NULL
                    )
                );
                BeginPath(hdc);
                MoveToEx(hdc, 10 + 30 * i, 25, NULL);
                LineTo(hdc, 20 + 30 * i, 75);
                LineTo(hdc, 30 + 30 * i, 25);
                EndPath(hdc);
                StrokePath(hdc);
                DeleteObject(
                    SelectObject(
                        hdc,
                        GetStockObject(BLACK_PEN)
                    )
                );
                MoveToEx(hdc, 10 + 30 * i, 25, NULL);
                LineTo(hdc, 20 + 30 * i, 75);
                LineTo(hdc, 30 + 30 * i, 25);
            }
            EndPaint(hwnd, &ps);
            return 0;
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
        }
    return DefWindowProc(hwnd, iMsg, wP, lParam);
}

/********************Arquivo: resource.h********************/

#define IDI_ICON " "

/********************Arquivo: resource.rc********************/

#include "afxres.h"
#include "resource.h"

IDI_ICON ICON "project1.ico"