[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 6장 6번 풀이

#include <Windows.h>
#include<tchar.h>
#include<string.h>
#include<math.h>
#include"resource.h"
//#pragma comment(linker,"/entry:WinMainCRTStartup /subsystem:console")
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
BOOL CALLBACK DlgFunc(HWND hDlg, 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("박정호"),
        WS_OVERLAPPEDWINDOW,
        50,
        50,
        1000,
        700,
        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)
{
    HDC hdc;
    PAINTSTRUCT ps;
 
    switch (iMsg)
    {
    case WM_CREATE:
        break;
 
    case WM_LBUTTONDOWN:
        DialogBox(hInst, MAKEINTRESOURCE(IDD_DIALOG5), hwnd, DlgFunc);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}
 
BOOL CALLBACK DlgFunc(HWND hDlg, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    static int select = -1;
    static int centerX = 50, centerY = 50;
    static int mx, my;
    static bool line = false, ClickOK = false;
    switch (iMsg)
    {
    case WM_INITDIALOG:
 
        break;
    case WM_LBUTTONDOWN:
        if (ClickOK)
        {
            mx = LOWORD(lParam);
            my = HIWORD(lParam);
            line = true;
            InvalidateRgn(hDlg, NULL, TRUE);
        }
        break;
    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case IDC_RADIO1:
            select = 0;
            break;
        case IDC_RADIO2:
            select = 1;
            break;
        case IDC_BUTTON_MOVE:
            SetTimer(hDlg, 1, 10, NULL);
            break;
        case IDOK:
            ClickOK = true;
            InvalidateRgn(hDlg, NULL, TRUE);
            break;
        case IDCANCEL:
            EndDialog(hDlg, 0);
            break;
        }
    case WM_TIMER:
        if (centerX < mx)
            centerX++;
        else
            centerX--;
 
        if (centerY < my)
            centerY++;
        else
            centerY--;
        InvalidateRgn(hDlg, NULL, TRUE);
        break;
    case WM_PAINT:
        hdc = BeginPaint(hDlg, &ps);
        if (select == 0)
        {
            Rectangle(hdc, centerX - 50, centerY - 50, centerX + 50, centerY + 50);
        }
        else if (select == 1)
        {
            Ellipse(hdc, centerX - 50, centerY - 50, centerX + 50, centerY + 50);
        }
        if (line)
        {
            MoveToEx(hdc, centerX, centerY, NULL);
            LineTo(hdc, mx, my);
        }
        if (centerX == mx&&centerY == my)
            KillTimer(hDlg, 1);
        EndPaint(hDlg, &ps);
        break;
    }
 
    return 0;
}