mfc example pen color & bold controll

example.cpp

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
    POINTS pt;

	static int x;
	static int y;
	static bool isDraw = false;

    static int select_color = RGB(0, 0, 0);
    static auto point_size = 1;

	switch (message)
	{
	case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		// 메뉴 선택을 구문 분석합니다.
		switch (wmId)
		{
		case IDM_ABOUT:
			DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
			break;
		case IDM_EXIT:
			DestroyWindow(hWnd);
			break;

        // color
        case ID_Red:
            select_color = RGB(255, 0, 0);
            break;
        case ID_Green:
            select_color = RGB(0, 255, 0);
            break;
        case ID_Blue:
            select_color = RGB(0, 0, 255);
            break;
        case ID_Black:
            select_color = RGB(0, 0, 0);
            break;

        // bold
        case ID_1Point:
            point_size = 1;
            break;
        case ID_3Point:
            point_size = 3;
            break;
        case ID_5Point:
            point_size = 5;
            break;

        // clear
        case ID_Clear:
            InvalidateRect(hWnd, NULL, TRUE);
            break;

		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		// TODO: 여기에 그리기 코드를 추가합니다.
		EndPaint(hWnd, &ps);
		break;

	case WM_LBUTTONDOWN:
		pt = MAKEPOINTS(lParam);
		x = pt.x;
		y = pt.y;
		isDraw = true;
		break;

	case WM_MOUSEMOVE:
		if(isDraw)
		{
            hdc = GetDC(hWnd);
            MoveToEx(hdc, x, y, NULL);

            pt = MAKEPOINTS(lParam);
            x = pt.x;
            y = pt.y;

		    const auto hpen = CreatePen(PS_SOLID, point_size, select_color);
		    const auto hbrush = CreateSolidBrush(select_color);

            SelectObject(hdc, hpen);
            SelectObject(hdc, hbrush);

            SetDCPenColor(hdc, select_color);
            
            LineTo(hdc, x, y);
            
            DeleteObject(hpen);
            DeleteObject(hbrush);
            ReleaseDC(hWnd, hdc);
            break;
		}
		break;

	case WM_LBUTTONUP:
		isDraw = false;
		break;

	case WM_LBUTTONDBLCLK:	// 윈도우 스타일 지정 CS_DBLCLKS
		InvalidateRect(hWnd, NULL, true);
		break;

	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}