[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 5장 4번 풀이

#include <Windows.h>
#include<tchar.h>
#include<string.h>
#include<math.h>
#include"resource.h"
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
 
HINSTANCE hInst;
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
    HWND hwnd;
    MSG msg;
    WNDCLASS WndClass;
 
    hInst = hInstance;
    WndClass.style = CS_HREDRAW | CS_VREDRAW;
    WndClass.lpfnWndProc = WndProc;
    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.hInstance = hInstance;
    WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClass.lpszMenuName = NULL;
    WndClass.lpszClassName = _T("Window Class Name");
 
    RegisterClass(&WndClass);
 
    hwnd = CreateWindow(
        _T("Window Class Name"),
        _T("홍길동의 첫 번째 윈도우"),
        WS_OVERLAPPEDWINDOW,
        100,
        100,
        1000,
        600,
        NULL,
        NULL,
        hInstance,
        NULL);
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}
 
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    static HDC hdc, memdc;
    PAINTSTRUCT ps;
    HPEN hPen, oldPen;
    static HBITMAP hBit, oldBit;
    static int xPos, yPos;
    static RECT rect;
    static bool DirX = true, DirY = false;
 
    switch (iMsg)
    {
    case WM_CREATE:
        xPos = yPos = 100;
        GetClientRect(hwnd, &rect);
        break;
    case WM_KEYDOWN:
        SetTimer(hwnd, 1, 100, NULL);
        break;
    case WM_TIMER:
        hdc = GetDC(hwnd);
        if (DirX == true && DirY == false)
        {
            xPos += 20;
            yPos -= 20;
        }
        else if (DirX == true && DirY == true)
        {
            xPos += 20;
            yPos += 20;
        }
        else if (DirX == false && DirY == true)
        {
            xPos -= 20;
            yPos += 20;
        }
        else if (DirX == false && DirY == false)
        {
            xPos -= 20;
            yPos -= 20;
        }
        BitBlt(hdc, xPos, yPos, 200, 200, memdc, 100, 150, SRCCOPY);
        if (xPos + 200 >= rect.right || xPos <= rect.left)
            DirX = DirX ? false : true;
        if (yPos + 200 >= rect.bottom || yPos <= rect.top)
            DirY = DirY ? false : true;
        ReleaseDC(hwnd, hdc);
        break;
    case WM_PAINT:
        hdc = GetDC(hwnd);
        hBit = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP1));
        memdc = CreateCompatibleDC(hdc);
        oldBit = (HBITMAP)SelectObject(memdc, hBit);
        BitBlt(hdc, xPos, yPos, 200, 200, memdc, 100, 150, SRCCOPY);
        ReleaseDC(hwnd, hdc);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}