Halcon学习之显示图像

当前使用软件版本：VS2017 + Halcon17.12
使用VS2017创建winform项目HalconDisplayImage。
通过nuget添加引用halcon动态库，注意选择版本17.12
选择form窗体，拖入HSmartWindowControl
进入cs文件添加命名空间using HalconDotNet;

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

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

更改项目属性，去掉“首选32位”

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);
            }
        }

运行选择一张图片

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);
            }
        }

滑动滑轮可以缩小图片
代码下载：https://download.****.net/download/weepingisgood/11122460

Halcon学习之显示图像

相关推荐