MFC在Picture控件上绘制ROI

末蓝、 2023-05-31 03:20 9阅读 0赞

前面介绍了 MFC对话框程序绘制ROI，但是ROI不是绘制在Picture控件上，而是整个窗体，离我们项目中的需求还有一段距离。待继续实现：

1.ROI的坐标改为相对Picture控件左上顶点为原点；

2.在Picture控件上绘制，移动ROI；

3.绘制区域需要保证在Picture控件之内；

## 1.ROI的坐标改为相对Picture控件左上顶点为原点 ##

解决办法：

1）定义一个CRect 变量，存储Picture控件相对对话框左上顶点的位置

CRect m_RectPicCtl;
    
    在初始化时添加如下两行代码即可，
    
    //转化为对话框上的相对位置
    
    ScreenToClient(m_RectPicCtl);
    
    //获得客户区域
    
    GetDlgItem(IDC_STATIC_SHOWIMAGE)->GetWindowRect(&m_RectPicCtl);

添加一个获取相对坐标的函数，输入参数为当前点，输出为Picture控件上的点相对于Picture控件左上顶点的坐标

CPoint  CXXXDlg::GetRelativeCoordinates(CPoint curpoint)
    
    {
    
             CPoint point;
    
             point.x = curpoint.x - m_RectPicCtl.left;
    
             point.y = curpoint.y - m_RectPicCtl.top;
    
             return point;
    
    }

## 2.在Picture控件上绘制，移动ROI ##

1）图片需要重绘

在Paint函数中添加显示图片的函数，绘制和刷新Picture区域

void CXXXDlg::OnPaint()
    
    {       
    
             CPaintDC dc(this);
    
             if (IsIconic())
    
             {                
    
                       //CPaintDC dc(this); // 用于绘制的设备上下文
    
                       SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
    
                       // 使图标在工作区矩形中居中
    
                       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;
    
                       // 绘制图标
    
                       dc.DrawIcon(x, y, m_hIcon);            
    
             }
    
             else
    
             {                
    
                       ShowMethord1();
    
                       CRect rtlbl;
    
                       GetDlgItem(IDC_STATIC_SHOWIMAGE)->GetWindowRect(&rtlbl);
    
                       //ScreenToClient(&rtlbl); //
    
                       InvalidateRect(&rtlbl);//只刷新我的图片框
    
                       UpdateWindow();                  
    
                       //ShowMethord1();
    
                       if (m_IsChose)
    
                       {
    
                                //若选择了该区域，则显示边框以及8个调整点
                                m_rctCurTracker.Draw(&dc);
                                //m_rctCurTracker.Draw(dc2);
                                //输出坐标信息
                                CRect rect = m_rctCurTracker.m_rect;
    
                                CPoint pt1 = GetRelativeCoordinates(m_rctCurTracker.m_rect.TopLeft());
    
    
                                CString strLT = _T("");
                                //strLT.Format(_T("%d,%d"),rect.left,rect.top);
                                strLT.Format(_T("%d,%d"),pt1.x, pt1.y);
                                SetDlgItemTextA(IDC_EDIT_CURROILT, strLT);
                                CPoint pt2 = GetRelativeCoordinates(m_rctCurTracker.m_rect.BottomRight());
                                CString strRB = _T("");
                                strRB.Format(_T("%d,%d"), pt2.x, pt2.y);
                                SetDlgItemTextA(IDC_EDIT_CURROIRB, strRB);
    
    
                                //输出当前ROI的长宽信
    
                                CString strWidth = _T("");
                                strWidth.Format(_T("%d"), rect.Width());                        
    
                                SetDlgItemTextA(IDC_EDIT_ROIWIDTH, strWidth);
    
    
                                CString strHeight = _T("");
    
                                strHeight.Format(_T("%d"), rect.Height());
    
                                SetDlgItemTextA(IDC_EDIT_ROIHEIGHT, strHeight);
    
                       }                           
    
                       CPen pen(PS_SOLID, 1, RGB(100, 255, 200));
    
                       dc.SelectObject(&pen);
    
                       //dc2->SelectObject(&pen);
    
                       CBrush *pbrush = CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
    
                       dc.SelectObject(pbrush);
    
                       //dc2->SelectObject(pbrush);
    
                       CRect rect;
    
                       m_rctCurTracker.GetTrueRect(&rect);//得到矩形区域的大小
    
                       dc.Rectangle(&rect);//画出矩形
    
                       //dc2->Rectangle(&rect);//画出矩形
    
                       CSize rct_size;
    
                       for (int i = 0; i < MAX_RECT_NUM; i++)
    
                       {
    
                                m_rctTracker[i].GetTrueRect(&rect);//得到矩形区域的大小
    
                                rct_size = m_rctTracker[i].m_rect.Size();
    
    
    
                                if (rct_size.cx * rct_size.cy == 0 || i == m_rctChoseNum)
    
                                {
    
                                         continue;
    
                                }
    
                                dc.Rectangle(&rect);//画出矩形
    
                                //dc2->Rectangle(&rect);//画出矩形
    
                       }
    
                       CDialogEx::OnPaint();
             }
    }

3.解决绘制区域确保在Picture控件之内

1）鼠标左键按下，点必须在Picture控件内；

2）当鼠标拖动ROI至Picture控件外的区域时，需要整体刷新一遍