鼠标绘图读取所有点

int m_NumStrokes=0;  //笔画数
int m_NumPoints=0;   //所有点数
int m_strokePoint=0;  //每一笔画的点数
int PixelHandXY[320*240*2];   //存放点的坐标
#define LINE_END_CONST_X  (9999)   //每一笔画开始的标志，X坐标
#define LINE_END_CONST_Y  (9999)   //每一笔画开始的标志，Y坐标
#define MAXPOINT 100     //每一笔画最多点数
bool BIsLButtonDown=false;   //有没有按下鼠标


void CHandDrawDialog::OnLButtonDown(UINT nFlags, CPoint point) 
{
    // TODO: Add your message handler code here and/or call default
    CWnd *Pwnd=GetDlgItem(IDC_STATIC_HAND_SHOW);
    this->ClientToScreen(&point);
    Pwnd->ScreenToClient(&point);
    Pwnd->GetClientRect(&m_ShowRect);
    if(m_ShowRect.PtInRect(point))
    {
       m_ptOrigin=point;
       BIsLButtonDown=true;
       m_NumStrokes++;
       m_strokePoint=1;
       PixelHandXY[m_NumPoints++]=LINE_END_CONST_X;  
       PixelHandXY[m_NumPoints++]=LINE_END_CONST_Y;
       PixelHandXY[m_NumPoints++]=m_ptOrigin.x;
       PixelHandXY[m_NumPoints++]=m_ptOrigin.y;     
       CString strInfo;
       strInfo.Format("笔画数目:%d",m_NumStrokes);
       SetDlgItemText(IDC_STATIC_SHOW,strInfo);

    }

    CDialog::OnLButtonDown(nFlags, point);
}





void CHandDrawDialog::OnMouseMove(UINT nFlags, CPoint point) 
{
    // TODO: Add your message handler code here and/or call default
    CWnd *Pwnd=GetDlgItem(IDC_STATIC_HAND_SHOW);
    CDC *pDC=Pwnd->GetDC();
    this->ClientToScreen(&point);
    Pwnd->ScreenToClient(&point);
    Pwnd->GetClientRect(&m_ShowRect);
    if(m_ShowRect.PtInRect(point))
    {
        HCURSOR hcur=AfxGetApp()->LoadCursor(IDC_CURSOR_PEN);
        SetClassLong(GetSafeHwnd(),GCL_HCURSOR,(LONG)hcur);
        if(BIsLButtonDown)
        {
            if(point.x<0) point.x=0;
            if(point.x>m_ShowRect.Width())    point.x=m_ShowRect.Width();
            if(point.y<0)    point.y=0;
            if(point.y>m_ShowRect.Height())    point.y=m_ShowRect.Height();
            if(m_strokePoint<=MAXPOINT)  //小与100才画出来
            {
                pDC->MoveTo(m_ptOrigin);
                    pDC->LineTo(point);
                    if(m_ptOrigin!=point)
                    {
                        PixelHandXY[m_NumPoints++]=point.x;
                        PixelHandXY[m_NumPoints++]=point.y;
                        m_ptOrigin=point;
                        m_strokePoint++;
                    }
                
            }
            
        }
    }
        else
    {
        SetClassLong(GetSafeHwnd(),GCL_HCURSOR,(LONG)LoadCursor(NULL, IDC_ARROW)); 
    }
        ReleaseDC(pDC);
    CDialog::OnMouseMove(nFlags, point);
}





void CHandDrawDialog::OnLButtonUp(UINT nFlags, CPoint point) 
{
    // TODO: Add your message handler code here and/or call default
    BIsLButtonDown=false;
    m_strokePoint = 0;
    CDialog::OnLButtonUp(nFlags, point);
}



重绘

void CHandDrawDialog::OnPaint() 
{
    CPaintDC dc(this); // device context for painting
    
    // TODO: Add your message handler code here
    CWnd *Pwnd=GetDlgItem(IDC_STATIC_HAND_SHOW);
    CDC *pDC=Pwnd->GetDC();
    CRect m_clientRect;
    Pwnd->GetClientRect(&m_clientRect);
    pDC->Rectangle(&m_clientRect);     //画矩形，使图片框背景为白色。
    CPoint m_StartPoint,m_EndPoint;
    for(int i=0;i<m_NumPoints-3;i=i+2)
    {
        if(PixelHandXY[i]!=LINE_END_CONST_X && PixelHandXY[i+3]!=LINE_END_CONST_Y)
        {
            m_StartPoint.x=PixelHandXY[i];
            m_StartPoint.y=PixelHandXY[i+1];
            m_EndPoint.x=PixelHandXY[i+2];
            m_EndPoint.y=PixelHandXY[i+3];
            pDC->MoveTo(m_StartPoint);
            if(m_EndPoint.x!=0) pDC->LineTo(m_EndPoint);
        }
    }
    
    // Do not call CDialog::OnPaint() for painting messages
}

打印

void CHandDrawDialog::OnButtonPrint() 
{
    // TODO: Add your control notification handler code here
         if(MessageBox("您要打印当前图像吗?","询问",MB_YESNO|MB_ICONQUESTION)==IDYES)
    {
        char szprinter[80]; 
        char *szDevice,*szDriver,*szOutput; 
        HDC hdcprint; // 定义一个设备环境句柄 
        //定义一个打印作业 
        static DOCINFO di={sizeof(DOCINFO),"printer",NULL}; 
        // 得到设备字符串存入数组szprinter中 
        GetProfileString("windows","device",",,,",szprinter,80); 
        // 将设备字符串分解 
        if (NULL!=(szDevice=strtok(szprinter,","))&& NULL!=(szDriver=strtok(NULL,","))&& NULL!=(szOutput=strtok(NULL,",")))
        {
            CWaitCursor wc;
            // 创建一个打印机设备句柄 
            if ((hdcprint=CreateDC(szDriver,szDevice,szOutput,NULL))!=0) 
            {
                if(StartDoc(hdcprint,&di)>0) //开始执行一个打印作业 
                {
                    StartPage(hdcprint); //打印机走纸,开始打印 
                    SaveDC(hdcprint); //保存打印机设备句柄 
                    // 输出一行文字 
                    CString str;
                    str.Format("班级: %d         姓名: %d         学号: %d    ",10,20,30);
                    TextOutA(hdcprint,150*6,40*6,str,str.GetLength());  

                   // 输出图像 
                   CPoint m_start,m_end;
                   for (int k=0;k<m_NumPoints-3;k=k+2)
                   {
                       if((PixelHandXY[k]!=LINE_END_CONST_X)&&(PixelHandXY[k+3]!=LINE_END_CONST_Y))  //-1是新笔画开始的标志
                       {
                            m_start.x=PixelHandXY[k]*6+150*6;
                            m_start.y=PixelHandXY[k+1]*6+90*6;
                            m_end.x=PixelHandXY[k+2]*6+150*6;
                            m_end.y=PixelHandXY[k+3]*6+90*6;
                            MoveToEx(hdcprint,m_start.x,m_start.y,NULL);
                            if (PixelHandXY[k+2]!=0) 
                            {
                                LineTo(hdcprint,m_end.x,m_end.y);  //m_end.x=0是轨迹结束的标志
                            }
                       }
                   }
            
                   RestoreDC(hdcprint,-1); //恢复打印机设备句柄 
                   EndPage(hdcprint); //打印机停纸,停止打印 
                   EndDoc(hdcprint); //结束一个打印作业 
                   MessageBox("打印完成!","提示",MB_OK); 
                }
                else 
                {
                    MessageBox("打印机没有连接!","提示",MB_OK|MB_ICONWARNING); 
                }

                // 用API函数DeleteDC销毁一个打印机设备句柄 
                DeleteDC(hdcprint); 
            } 
            else 
            { 
                MessageBox("没有安装打印机!","提示",MB_OK|MB_ICONWARNING); 
                return; 
            } 
        }
    }
}