2.2.3 C#中显示控件BDPictureBox 的实现----控件实现

1 界面控件布局

显示控件布局

2图片内存Mat类说明

原始图片：m_raw_mat ,Display_Mat()调用时更新或者InitDisplay_Mat时更新
局部放大显示图片：m_extract_zoom_mat，更新scale和scroll信息后更新
overlay图片 m_extract_overlay_mat , 显示曲线和文本信息
最终呈现图片：m_extract_zoom_dispaly

3 正常图片刷新流程举例

视觉检测应用时，为了减少图片刷新次数，一般只会在最后更新一下图片内存到显示区域，以提高速度，需要用到一个bool类型标志位 b_flush_display
flush 图片内存流程

4 滚动条事件代码

/// <summary>
/// hScr0_Scroll
/// remark: 滚动条 hsrco事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void hScr0_Scroll(object sender, EventArgs e)
{
    double t_gap = DateTime.Now.Subtract(_last_pan).TotalMilliseconds;
    if (t_gap < 10) return;
    if (!BD_Window_State_Judge()) return;
    bd_window_state = BDDISPLAY_STATE.zoom_display;
if (BD_OperateSet.MatisNotNull(m_raw_mat))
{
	// 计算公式，就是 计算当前 scroll中心相对 scroll原始中心偏移值，然后 修正 画布的放大系数
	DispManager.get_DispCTX().update_Scroll_Info_after_scroll();
	OpenCvSharp.Point offset = DispManager.get_DispCTX().getoffset();
	label_img_info.Text = " X:" + offset.X.ToString("0.0") + " Y:" + offset.Y.ToString("0.0");
	b_flush_display = false;
	update_ExtractRGB_and_NewOverlay();
	b_flush_display = true;
	Disp_Point_Internal(0, 0, new Scalar(0, 0, 0), 1);
	b_flush_display = true;
}
bd_window_state = BDDISPLAY_STATE.idle;
_last_pan = DateTime.Now;
}

5 按钮button Zoom事件

/// <summary>
/// btn_zoom_Click
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_zoom_Click(object sender, EventArgs e)
{
    if (!BD_Window_State_Judge()) return;
    bd_window_state = BDDISPLAY_STATE.zoom_display;
    try
    {
        if (BD_OperateSet.MatisNotNull(m_raw_mat))
        {
            DispManager.get_DispCTX().enlarge(1.1f);
            OpenCvSharp.Point offset = DispManager.get_DispCTX().getoffset();
            b_flush_display = false;
            label_img_info.Text = " X:" + offset.X.ToString("0.0") + " Y:"+offset.Y.ToString("0.0");
            update_ExtractRGB_and_NewOverlay();
            b_flush_display = true;
            Disp_Point_Internal(0, 0, new Scalar(0, 0, 0), 1);
            b_flush_display = false;
        }
    }
    catch (Exception ex)
    {
        label_img_info.Text = "Zoom:" + ex.Message;
    }
    bd_window_state = BDDISPLAY_STATE.idle;
}

6 更新局部图片函数代码update_ExtractRGB_and_NewOverlay

 /// <summary>
/// update_ExtractRGB_and_NewOverlay   用于 scale系数变化时用， overlay会清零
/// </summary>
public void update_ExtractRGB_and_NewOverlay()
{ 
    if (!BD_OperateSet.MatisNotNull(m_raw_mat)) return;
    Mat m_extract_mat_copy = new Mat();
    try
    {
        int nRet = DispManager.get_DispCTX().update_display_img(m_raw_mat,ref  hom2d_quick, ref m_extract_zoom_mat); 
        if (nRet != 0) return;
        #region  // 增加显示 多种图片类型 
        MatType img_type = m_raw_mat.Type();
        double minVal, maxVal;
        double scale, add;
        //step3  m_extract_zoom_dispaly
        width_extract_zoom = m_extract_zoom_mat.Width;
        height_extract_zoom = m_extract_zoom_mat.Height;
        BD_OperateSet.Assign_Temp(ref m_extract_zoom_overlay, Mat.Zeros(m_extract_zoom_mat.Size(), MatType.CV_8UC3));       
        switch (img_type.Value)
        {
            case 0: // CV_8UC1 
                lock (_object_display)
                {
                    BD_OperateSet.Assign_Temp(ref m_extract_zoom_dispaly, new Mat());
                    Cv2.CvtColor(m_extract_zoom_mat, m_extract_zoom_dispaly, ColorConversionCodes.GRAY2BGR);
                   }
                  break;
            case 1:
                break;
            case 2:// CV_16UC1 
            case 3://CV_16US1 
                Cv2.MinMaxIdx(m_raw_mat, out minVal, out maxVal);
                if ((maxVal - minVal) != 0)
                    scale = (255.0) / (maxVal - minVal);
                else scale = 1;
                add = -minVal * scale;
                lock (_object_display)
                {
                    m_extract_zoom_mat.ConvertTo(m_extract_zoom_mat, MatType.CV_8UC1, scale, add);
                    BD_OperateSet.Assign_Temp(ref m_extract_zoom_dispaly, new Mat());
                    Cv2.CvtColor(m_extract_zoom_mat, m_extract_zoom_dispaly, ColorConversionCodes.GRAY2BGR); 
                }
                   break;
            case 5:// CV_32FC1  
                break;
            case 6:// CV_64FC1 
                break;
            case 16: // CV_8UC3  
                lock (_object_display)
                { // 销毁内存
                    BD_OperateSet.Assign_Temp(ref m_extract_zoom_dispaly, m_extract_zoom_mat.Clone());
                }
                break;
            case 21: // CV_64FC3  
                break;
            default:// 默认显示黑色图片 
                lock (_object_display)
                { // 销毁内存
                    BD_OperateSet.Assign_Temp(ref m_extract_zoom_dispaly, new Mat());
                    Cv2.CvtColor(m_extract_zoom_mat, m_extract_zoom_dispaly, ColorConversionCodes.GRAY2BGR); 
                }
                break;
        } 
        #endregion
    }
    catch (Exception ex)
    {
        label_img_info.Text = "Update Quick ROI&Img:" + ex.Message;
    }
}

7 图片显示Display_Mat

public void Display_Mat(ref Mat m_inputimg)
{
	if (!BD_Window_State_Judge()) return;
	bd_window_state = BDDISPLAY_STATE.display_mat;
	try
	{
	    if (BD_OperateSet.MatisNotNull(m_inputimg))
	    {
	        // 如果 原来图像尺寸和 input尺寸有所变化，需要调用InitDisplay（）
	
	        if(DispManager.get_DispCTX().NeedInitDisplay(m_inputimg.Size(),new OpenCvSharp.Size(pB_Display.Width,pB_Display.Height)))
	        {
	            InitDisplay_Mat_Interanl(ref m_inputimg); bd_window_state = BDDISPLAY_STATE.idle; return;
	        } 
	        // m_raw_mat = m_inputimg;
	        BD_OperateSet.Assign_Mat(ref m_raw_mat, ref m_inputimg);
	        //n_DisplayMode = 0; 
	        if (b_flush_display)
	        {
	            update_extract_RGB_And_Overlays();
	            pB_Display.Invalidate();
	        }
	        label_img_info.Text = "Image info:"; 
	    }
	    else
	    {
	      
	    }
	}
	catch (Exception ex)
	{
	    label_img_info.Text = "Disp Img:" + ex.Message;
	}
	bd_window_state = BDDISPLAY_STATE.idle;
}