Halcon学习之显示图像

1. 当前使用软件版本：VS2017 + Halcon17.12

2. 使用VS2017创建winform项目HalconDisplayImage。

3. 通过nuget添加引用halcon动态库，注意选择版本17.12

4. 选择form窗体，拖入HSmartWindowControl

5. 进入cs文件添加命名空间using HalconDotNet;

6. 编写读取图像函数

           #region 获取图像
           public static void GetImage(string image, out HObject hoImage)
           {
               HOperatorSet.GenEmptyObj(out hoImage);
               HOperatorSet.ReadImage(out hoImage, image);
           }
           #endregion

    

7. 编写显示图像函数

   #region 显示图像string
           public static void ShowImage(string image, HSmartWindowControl hWindowControl, bool isClearWindow = false)
           {
               hWindowControl.Invoke(
                   new Action(() =>
                   {
                       if (isClearWindow)
                       {
                           HOperatorSet.ClearWindow(hWindowControl.HalconID);
                       }
   
                       HTuple width = null;
                       HTuple height = null;
                       HObject hoImage;
                       GetImage(image, out hoImage);
                       HOperatorSet.GetImageSize(hoImage, out width, out height);
   
                       bool needResizeImage = true;
                       //获取图像大小及纵横比
                       HOperatorSet.GetImageSize(hoImage, out width, out height);
                       int im_width = int.Parse(width.ToString());
                       int im_height = int.Parse(height.ToString());
                       double im_AspectRatio = (double)(im_width) / (double)(im_height);
                       //获取窗口大小及纵横比
                       int w_width = hWindowControl.Size.Width;
                       int w_height = hWindowControl.Size.Height;
                       double w_AspectRatio = (double)(w_width) / (double)(w_height);
   
                       HOperatorSet.SetSystem("int_zooming", "false");//图像缩放之前最好将此参数设置为false.
                       HTuple para = new HTuple("constant");
                       HObject hoZoomImage;
                       HOperatorSet.GenEmptyObj(out hoZoomImage);
   
                       hoZoomImage.Dispose();
                       if (w_width < im_width && im_AspectRatio > w_AspectRatio)
                       {
                           //超宽图像               
                           HOperatorSet.ZoomImageSize(hoImage, out hoZoomImage, w_width, w_width / im_AspectRatio, para);
                       }
                       else if (w_height < im_height && im_AspectRatio < w_AspectRatio)
                       {
                           //超高图像                
                           HOperatorSet.ZoomImageSize(hoImage, out hoZoomImage, w_height * im_AspectRatio, w_height, para);
                       }
                       else
                       {
                           needResizeImage = false;
                       }
   
                       HOperatorSet.SetPart(hWindowControl.HalconID, 0, 0, -2, -2);
   
                       if (needResizeImage)
                       {
                           HOperatorSet.DispObj(hoZoomImage, hWindowControl.HalconID);
                       }
                       else
                       {
                           HOperatorSet.DispObj(hoImage, hWindowControl.HalconID);
                       }
   
                       hoImage.Dispose();
                       hoZoomImage.Dispose();
                   }));
           }
           #endregion

    

8. 更改项目属性，去掉“首选32位”

9. 为窗体添加load事件

           private void Form1_Load(object sender, EventArgs e)
           {
               OpenFileDialog openFileDialog = new OpenFileDialog();
               //openFileDialog.InitialDirectory = "c:\\";
               openFileDialog.Filter = "PNG|*.PNG|BMP|*.BMP|JPG|*.JPG|GIF|*.GIF";
               openFileDialog.RestoreDirectory = true;
               openFileDialog.FilterIndex = 1;
               openFileDialog.Multiselect = false;
               if (openFileDialog.ShowDialog() == DialogResult.OK)
               {
                   string fName = openFileDialog.FileName;
                   ShowImage(fName, hSmartWindowControl1);
               }
           }

10. 运行选择一张图片

11. 添加鼠标滑轮放大缩小图片功能，在窗体的load事件的首行添加鼠标滑轮滚动事件，注意此处是针对窗体的MouseWheel 事件而不是hSmartWindowControl1控件

    this.MouseWheel += hSmartWindowControl1_HMouseWheel;

            private void hSmartWindowControl1_HMouseWheel(object sender, MouseEventArgs e)
            {
                System.Drawing.Point pt = this.Location;
                int leftBorder = hSmartWindowControl1.Location.X;
                int rightBorder = hSmartWindowControl1.Location.X + hSmartWindowControl1.Size.Width;
                int topBorder = hSmartWindowControl1.Location.Y;
                int bottomBorder = hSmartWindowControl1.Location.Y + hSmartWindowControl1.Size.Height;
                if (e.X > leftBorder && e.X < rightBorder && e.Y > topBorder && e.Y < bottomBorder)
                {
                    MouseEventArgs newe = new MouseEventArgs(e.Button, e.Clicks,
                                                         e.X - pt.X, e.Y - pt.Y, e.Delta);
                    hSmartWindowControl1.HSmartWindowControl_MouseWheel(sender, newe);
                }
            }

     

12. 滑动滑轮可以缩小图片

13. 代码下载：https://download.csdn.net/download/weepingisgood/11122460