【示例教程】如何使用LEADTOOLS图像标注控件在界面上对图像进行标注

leadtools对图像和文档提供了多种类型的标注，允许用户通过图形界面或者后台代码进行插入。本教程将按照步骤分享如何使用图像标注控件在界面上对图像进行标注。

1.创建VS项目

在VS中创建winform项目，创建完成后需要确认使用的.NET版本以及编译的目标平台。本例采用.NET4.0和X86平台进行编译。

2.引用接口dll

需要引用的dll列表如下，可以在C:\LEADTOOLS 19\Bin\Dotnet4\Win32找到。

主界面Form1代码中添加引用

using System.Windows.Forms;
using Leadtools;
using Leadtools.Codecs;
using Leadtools.WinForms;
using Leadtools.Annotations;

3.主界面添加相关控件

在设计界面添加一个MenuStrip菜单

添加按钮用以打开文件；

添加下拉框，包括2个选项：标注模式和浏览模式

4.后台代码编写

4.1控件初始化相关代码
添加相关对象

        RasterImageViewer viewer = new RasterImageViewer();
        RasterImage img;
        AnnAutomationManager annger;
        AnnAutomation automation;

添加initControl()方法，用于初始化图片浏览控件以及标注相关控件，在Form1()构造函数中调用该方法

private void initControl() {
            Support.SetLicense();
            viewer.Dock = DockStyle.Fill;
            panel1.Controls.Add(viewer);
            viewer.HorizontalAlignMode = RasterPaintAlignMode.Center;
            viewer.VerticalAlignMode = RasterPaintAlignMode.Center;
            loadImage("qwe.jpg");
            if (viewer.Image != null)
            {
                // create and setup the automation manager 
                annger = new AnnAutomationManager();

                // Instruct the manager to create the default (all) automation objects. 
                annger.CreateDefaultObjects();

                // create the toolbar and add it to the form 
                annger.CreateToolBar();
                Controls.Add(annger.ToolBar);

                // setup the automation (will create the container as well) 
                automation = new AnnAutomation(annger, viewer);

                // add an event handler for changes to the current designer 
                automation.CurrentDesignerChanged += new EventHandler(automation_CurrentDesignerChanged);

                // setup this automation as the active one 
                automation.Active = true;
            }
            toolStripComboBox1.SelectedIndex = 0;
        }

4.2添加加载图像方法

private void loadImage(string filename)
        {
            img = new RasterCodecs().Load(filename);
            viewer.Image = img;
        }

4.3添加automation_CurrentDesignerChanged方法

private void automation_CurrentDesignerChanged(object sender, EventArgs e)
        {
            AnnAutomation automation = sender as AnnAutomation;
            AnnButtonRunDesigner buttonRunDesigner = automation.CurrentDesigner as AnnButtonRunDesigner;
            if (buttonRunDesigner != null)
                buttonRunDesigner.Run += new EventHandler(buttonRunDesigner_Run);
        }

4.4添加buttonRunDesigner_Run方法

private void buttonRunDesigner_Run(object sender, AnnRunDesignerEventArgs e)
        {
            if (e.OperationStatus == AnnDesignerOperationStatus.End)
            {
                AnnButtonObject btn = e.Object as AnnButtonObject;
                MessageBox.Show(string.Format("Button with text = {0} was clicked!", btn.Text));
            }
        }

4.5添加打开文件按钮事件方法

private void loadImage(string filename)
        {
            img = new RasterCodecs().Load(filename);
            viewer.Image = img;
        }

4.6添加模式下拉框选项改变事件方法

private void toolStripComboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            annger.UserMode = (toolStripComboBox1.SelectedIndex == 0) ? AnnUserMode.Design : AnnUserMode.Run;
        }

5.编译运行

演示程序界面如下图所示