我的系统要在客户区画一写曲线,这一步已经实现了,但是当有遮挡时就需要刷新,但如何将这些曲线信息存起来啊,或者有什么更好的方法?谢谢了
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- 超线程下的绘图问题
CBitmap MemBitmap;//定义一个位图对象
//建立与屏幕显示兼容的内存显示设备
MemDC.CreateCompatibleDC(NULL);
//建立一个与屏幕显示兼容的位图,位图的大小用窗口的大小
MemBitmap.CreateCompatibleBitmap(pDC,300,300);
//将位图选入到内存显示设备中
CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap);
//用背景色将位图清除干净
// MemDC.FillSolidRect(0,0,300,300,RGB(0,0,0));
//绘图
画曲线的代码 ....
//显示在窗口
pDC->BitBlt(0,0,300,300,&MemDC,0,0,SRCCOPY);
//绘图完成后的清理
MemBitmap.DeleteObject();
MemDC.DeleteDC();
以前我做过的一个例子:
现在复制过来// DrawDlg.h : header file
//#if !defined(AFX_DRAWDLG_H__DBD98072_5313_4D48_8485_C102C4DDAA90__INCLUDED_)
#define AFX_DRAWDLG_H__DBD98072_5313_4D48_8485_C102C4DDAA90__INCLUDED_#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000/////////////////////////////////////////////////////////////////////////////
// CDrawDlg dialogclass CDrawDlg : public CDialog
{
// Construction
public:
CBitmap* m_bitmap;
CDrawDlg(CWnd* pParent = NULL);// standard constructor// Dialog Data
//{{AFX_DATA(CDrawDlg)
enum { IDD = IDD_DRAW_DIALOG };
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CDrawDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX);// DDX/DDV support
//}}AFX_VIRTUAL// Implementation
protected:
HICON m_hIcon;// Generated message map functions
//{{AFX_MSG(CDrawDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnDestroy();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif // !defined(AFX_DRAWDLG_H__DBD98072_5313_4D48_8485_C102C4DDAA90__INCLUDED_)// DrawDlg.cpp : implementation file
//#include "stdafx.h"
#include "Draw.h"
#include "DrawDlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog
{
public:
CAboutDlg();// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CDrawDlg dialogCDrawDlg::CDrawDlg(CWnd* pParent /*=NULL*/)
: CDialog(CDrawDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CDrawDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);m_bitmap=NULL;
}void CDrawDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CDrawDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CDrawDlg, CDialog)
//{{AFX_MSG_MAP(CDrawDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_WM_LBUTTONDOWN()
ON_WM_DESTROY()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CDrawDlg message handlersBOOL CDrawDlg::OnInitDialog()
{
CDialog::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)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
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
CRect rc;
GetClientRect(&rc);CPaintDC dc(this);
m_bitmap=new CBitmap();
m_bitmap->CreateCompatibleBitmap(&dc,rc.Width(),rc.Height());CDC myDC;
myDC.CreateCompatibleDC(&dc);
CBitmap *pOldBitmap = myDC.SelectObject(m_bitmap); CBrush mybrush(RGB(255,255,255));
myDC.FillRect(&rc,&mybrush);
myDC.SelectObject(pOldBitmap);
myDC.DeleteDC();
return TRUE; // return TRUE unless you set the focus to a control
}void CDrawDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::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 CDrawDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for paintingSendMessage(WM_ICONERASEBKGND, (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
{
CPaintDC dc(this);
if(!m_bitmap)
return;
BITMAP bmp;
m_bitmap->GetBitmap(&bmp);
CDC cdc;
cdc.CreateCompatibleDC(&dc);
CBitmap* pOldbm;
pOldbm=cdc.SelectObject(m_bitmap);
dc.BitBlt(0,0,bmp.bmWidth,bmp.bmHeight,&cdc,0,0,SRCCOPY);
cdc.SelectObject(pOldbm);
CDialog::OnPaint();
}
}// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CDrawDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}void CDrawDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
CPaintDC dc(this);
CDC myDC;
myDC.CreateCompatibleDC(&dc);
CBitmap *pOldBitmap = myDC.SelectObject(m_bitmap); //_____________________画图(在这里用myDC画曲线)
//CBrush brush;
//brush.CreateSolidBrush(RGB(255,0,0));
//myDC.SelectObject(&brush);
//CRect rcShape (point.x - 4, point.y - 4, point.x + 4, point.y + 4);
//myDC.Ellipse(rcShape);Your画曲线的过程(&myDC);//_____________________
myDC.SelectObject(pOldBitmap);
myDC.DeleteDC();
Invalidate(FALSE);
CDialog::OnLButtonDown(nFlags, point);
}void CDrawDlg::OnDestroy()
{
CDialog::OnDestroy();// TODO: Add your message handler code here
delete m_bitmap;
}