Рисование прямоугольника мышкой (MFC)

// Mouse_MessagesDlg.cpp : implementation file
//
 
#include "stdafx.h"
#include "Mouse_Messages.h"
#include "Mouse_MessagesDlg.h"
#include "afxdialogex.h"
 
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
 
// CAboutDlg dialog used for App About
 
class CAboutDlg : public CDialogEx
{
public:
    CAboutDlg();
 
    // Dialog Data
    enum { IDD = IDD_ABOUTBOX };
 
protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
 
    // Implementation
protected:
    DECLARE_MESSAGE_MAP()
};
 
CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}
 
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}
 
BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()
 
 
// CMouse_MessagesDlg dialog
 
 
 
 
CMouse_MessagesDlg::CMouse_MessagesDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CMouse_MessagesDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
 
void CMouse_MessagesDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}
 
BEGIN_MESSAGE_MAP(CMouse_MessagesDlg, CDialogEx)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_WM_MOUSEMOVE()
    ON_BN_CLICKED(IDC_Point, &CMouse_MessagesDlg::OnBnClickedPoint)
    ON_BN_CLICKED(IDC_Line, &CMouse_MessagesDlg::OnBnClickedLine)
    //  ON_WM_LBUTTONUP()
    ON_WM_LBUTTONDOWN()
    ON_BN_CLICKED(IDC_BTN_Pencil, &CMouse_MessagesDlg::OnBnClickedBtnPencil)
    ON_BN_CLICKED(IDC_BTN_Rect, &CMouse_MessagesDlg::OnBnClickedBtnRect)
    ON_BN_CLICKED(IDC_BTN_Elipse, &CMouse_MessagesDlg::OnBnClickedBtnElipse)
    ON_BN_CLICKED(IDC_BTN_Airbrush, &CMouse_MessagesDlg::OnBnClickedBtnAirbrush)
    ON_BN_CLICKED(IDC_BTN_Eraser, &CMouse_MessagesDlg::OnBnClickedBtnEraser)
    ON_BN_CLICKED(IDC_BTN_Color, &CMouse_MessagesDlg::OnBnClickedBtnColor)
    ON_BN_CLICKED(IDC_BTN_Polygon, &CMouse_MessagesDlg::OnBnClickedBtnPolygon)
END_MESSAGE_MAP()
 
 
// CMouse_MessagesDlg message handlers
 
BOOL CMouse_MessagesDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();
 
    // Add "About..." menu item to system menu.
 
    // IDM_ABOUTBOX must be in the system command range.
    ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    ASSERT(IDM_ABOUTBOX < 0xF000);
 
    CMenu* pSysMenu = GetSystemMenu(FALSE);
    if (pSysMenu != NULL)
    {
        BOOL bNameValid;
        CString strAboutMenu;
        bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
        ASSERT(bNameValid);
        if (!strAboutMenu.IsEmpty())
        {
            pSysMenu->AppendMenu(MF_SEPARATOR);
            pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
        }
    }
 
    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);         // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon
 
    // TODO: Add extra initialization here
 
    flagBtn = 0;
    color = RGB(0,0,0);
    return TRUE;  // return TRUE  unless you set the focus to a control
}
 
void CMouse_MessagesDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if ((nID & 0xFFF0) == IDM_ABOUTBOX)
    {
        CAboutDlg dlgAbout;
        dlgAbout.DoModal();
    }
    else
    {
        CDialogEx::OnSysCommand(nID, lParam);
    }
}
 
// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.
 
void CMouse_MessagesDlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting
 
        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
 
        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;
 
        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialogEx::OnPaint();
 
        rect.SetRect(10,10,600,350);
        mainWindow();
    }
}
 
// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMouse_MessagesDlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}
 
 
void CMouse_MessagesDlg::OnBnClickedBtnColor()
{
    CColorDialog dlg(color, CC_FULLOPEN); 
    int res = dlg.DoModal();
    if (res == IDOK) 
    { 
        color = dlg.GetColor(); 
    }
 
}
 
 
void CMouse_MessagesDlg::OnMouseMove(UINT nFlags, CPoint point)
{
    CClientDC painter(this);
    CPen pen(PS_DOT,2,color);
    if(nFlags == MK_LBUTTON) 
    {
        if(flagBtn == 1) //Rectangle
        {
            Invalidate();
            UpdateWindow();
            rect.SetRect(point,oldPoint);
            painter.SelectObject(pen);
            painter.Rectangle(rect);
        }
    }
       CDialogEx::OnMouseMove(nFlags, point);
}
 
 
void CMouse_MessagesDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
    oldPoint = point;
 
    CDialogEx::OnLButtonDown(nFlags, point);
}
 
void CMouse_MessagesDlg::paintRect()
{   
    CClientDC painter(this);
    CPen pen(PS_DOT,2,color);
    painter.SelectObject(pen);
    painter.Rectangle(rect);
}
 
void CMouse_MessagesDlg::mainWindow()
{   
    CClientDC painter(this);
    CPen pen(PS_DOT,2,RGB(0,0,0));
    painter.SelectObject(pen);
    painter.Rectangle(rect);
 
 
}
 
void CMouse_MessagesDlg::OnBnClickedRect()
{
    flagBtn = 1;
}