[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 4장 7번 풀이(미완성)

#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);
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
    HWND hwnd;
    MSG msg;
 
    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");
    WndClass.lpszMenuName = MAKEINTRESOURCE(IDR_MENU1);
 
    RegisterClass(&WndClass);
 
    hwnd = CreateWindow(
        _T("Window Class Name"),
        _T("홍길동의 첫 번째 윈도우"),
        WS_OVERLAPPEDWINDOW,
        100,
        100,
        1000,
        1000,
        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;
    HPEN hPen;
    HBRUSH hBrush;
    CHOOSECOLOR COLOR;
    static COLORREF temp[16], PenColor = RGB(0, 0, 0), FaceColor = RGB(255, 255, 255);
 
    static bool isClick = false;
    static int mX1, mY1, mX2, mY2;
    static int FigureCount = 0;
    struct Object
    {
        int X1, Y1, X2, Y2;
        int Figure = 0;
        COLORREF PenColor = RGB(0, 0, 0), FaceColor = RGB(255, 255, 255);
    };
    static Object object[100];
 
    switch (iMsg)
    {
    case WM_CREATE:
        break;
    case  WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case ID_PENCOLOR:
            for (int i = 0; i < 16; i++)
                temp[i] = RGB(rand() % 256, rand() % 256, rand() % 256);
            memset(&COLOR, 0, sizeof(CHOOSECOLOR));
            COLOR.lStructSize = sizeof(CHOOSECOLOR);
            COLOR.hwndOwner = hwnd;
            COLOR.lpCustColors = temp;
            COLOR.Flags = CC_FULLOPEN;
            if (ChooseColor(&COLOR) != 0)
            {
 
                for (int i = FigureCount; i < 100; i++)
                    object[i].PenColor = COLOR.rgbResult;
            }
            break;
        case ID_FACECOLOR:
            for (int i = 0; i < 16; i++)
                temp[i] = RGB(rand() % 256, rand() % 256, rand() % 256);
            memset(&COLOR, 0, sizeof(CHOOSECOLOR));
            COLOR.lStructSize = sizeof(CHOOSECOLOR);
            COLOR.hwndOwner = hwnd;
            COLOR.lpCustColors = temp;
            COLOR.Flags = CC_FULLOPEN;
            if (ChooseColor(&COLOR) != 0)
            {
                for (int i = FigureCount; i < 100; i++)
                    object[i].FaceColor = COLOR.rgbResult;
            }
            break;
        case ID_LINE:
            for (int i = FigureCount; i < 100; i++)
                object[i].Figure = 1;
            break;
        case ID_ELLIPSE:
            for (int i = FigureCount; i < 100; i++)
                object[i].Figure = 2;
            break;
        case ID_RECTANGLE:
            for (int i = FigureCount; i < 100; i++)
                object[i].Figure = 3;
            break;
        }
        break;
    case WM_LBUTTONDOWN:
        //hdc = GetDC(hwnd);
        isClick = true;
        object[FigureCount].X1 = mX1 = LOWORD(lParam);
        object[FigureCount].Y1 = mY1 = HIWORD(lParam);
 
        //ReleaseDC(hwnd, hdc);
        break;
    case WM_LBUTTONUP:
        isClick = false;
        object[FigureCount].X2 = mX2 = LOWORD(lParam);
        object[FigureCount].Y2 = mY2 = HIWORD(lParam);
        InvalidateRgn(hwnd, NULL, TRUE);
        FigureCount++;
        break;
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
 
 
        for (int i = 0; i <= FigureCount; i++)
        {
            hPen = CreatePen(PS_SOLID, 1, object[i].PenColor);
            SelectObject(hdc, hPen);
            hBrush = CreateSolidBrush(object[i].FaceColor);
            SelectObject(hdc, hBrush);
            switch (object[i].Figure)
            {
            case 1:
                MoveToEx(hdc, object[i].X1, object[i].Y1, NULL);
                LineTo(hdc, object[i].X2, object[i].Y2);
                break;
            case 2:
                Ellipse(hdc, object[i].X1, object[i].Y1, object[i].X2, object[i].Y2);
                break;
            case 3:
                Rectangle(hdc, object[i].X1, object[i].Y1, object[i].X2, object[i].Y2);
                break;
            }
        }
        EndPaint(hwnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}