[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 5장 10번 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;
    hInst = hInstance;
    WNDCLASS WndClass;
    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); //윈도우 클래스를 커널에 등록
 
    hwnd = CreateWindow( //윈도우 핸들값 반환
        _T("Window Class Name"), //윈도우 클래스 이름
        _T("홍길동의 첫 번째 윈도우"), //윈도우 타이틀이름
        WS_OVERLAPPEDWINDOW, //윈도우 스타일
        100, //윈도우 위치 x좌표
        100,//윈도우 위치 y좌표
        1000, //윈도우 가로크기
        700, //윈도우 세로크기
        NULL, //부모 윈도우핸들
        NULL, //메뉴핸들
        hInstance, //응용프로그램 인스턴스
        NULL); //생성 윈도우 정보
 
    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)
{
    HDC hdc,memdc;
    PAINTSTRUCT ps;
    HPEN hPen, oldPen;
    static int catX = 100, catY = 100,ratX,ratY;
    static RECT ratRect;
    static bool isClick = false;
    static float m = 0;
    static HBITMAP RatBit,CatBit,oldBit;
 
    switch (iMsg)
    {
    case WM_CREATE:
        RatBit = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP7));
        CatBit = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP6));
        break;
 
    case WM_KEYDOWN:
        break;
    case WM_LBUTTONDOWN:
        isClick = true;
        ratX = LOWORD(lParam);
        ratY = HIWORD(lParam);
        InvalidateRgn(hwnd, NULL, TRUE);
        SetTimer(hwnd, 1, 10, NULL);
        break;
    case WM_MOUSEMOVE:
        hdc = GetDC(hwnd);
        if (isClick)
        {
            ratX = LOWORD(lParam);
            ratY = HIWORD(lParam);
            InvalidateRgn(hwnd, NULL, TRUE);
        }
        ReleaseDC(hwnd, hdc);
        break;
    case WM_LBUTTONUP:
        isClick = false;
        InvalidateRgn(hwnd, NULL, TRUE);
        break;
    case WM_TIMER:
        if (isClick)
        {
            if (ratX> catX)
                catX += 1;
            else
                catX -= 1;
 
            if (ratY> catY)
                catY += 1;
            else
                catY -= 1;
            InvalidateRgn(hwnd, NULL, TRUE);
        }
        break;
 
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        memdc = CreateCompatibleDC(hdc);
        oldBit=(HBITMAP)SelectObject(memdc, RatBit);
        if (isClick)
            BitBlt(hdc, ratX, ratY, 68, 49, memdc, 0, 0, SRCCOPY);
        SelectObject(memdc, CatBit);
        BitBlt(hdc, catX, catY, 67, 47, memdc, 0, 0, SRCCOPY);
        SelectObject(memdc, oldBit);
        DeleteDC(memdc);
        EndPaint(hwnd, &ps);
        break;
    case WM_DESTROY:
        DeleteObject(CatBit);
        DeleteObject(RatBit);
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}