halcon+C#联合编程学习HDrawingObject类用法

最近在学习halcon自带的ROI绘制类，修改了halcon自带的demo（所用版本为halcon12，其他版本大同小异），demo路径：C:\Users\Public\Documents\MVTec\HALCON-12.0\examples

VS版本：VS2022；目标框架：.NETFrameWork4.5.2 使用的窗体：halcon自带的hWindowControl窗体控件

所实现的功能：1、选中或者新创建的ROI为蓝色，未选中的ROI为红色。2、ROI内的区域进行阈值分割，拖动ROI，修改ROI大小，都可以显示分割的结果。

UI界面：

后台代码：

注意事项：1.匹配两个HDrawingObject对象是否相等，通过匹配ID属性实现

2.可以学习如何使用ROI的回调函数

1.  
   using HalconDotNet;
2.  
   using System;
3.  
   using System.Collections.Generic;
4.  
   using System.ComponentModel;
5.  
   using System.Data;
6.  
   using System.Drawing;
7.  
   using System.Linq;
8.  
   using System.Runtime.CompilerServices;
9.  
   using System.Text;
10.  
    using System.Threading.Tasks;
11.  
    using System.Windows.Forms;
12.  
     
13.  
    namespace DrawingObject
14.  
    {
15.  
    public interface IHWindowGraphicStack
16.  
    {
17.  
    void DisplayResults();
18.  
    void AddToStack(HObject o);
19.  
    }
20.  
    public partial class Form1 : Form, IHWindowGraphicStack
21.  
    {
22.  
    private List<HDrawingObject> list = new List<HDrawingObject>();
23.  
    private Stack<HObject> graphic_stack = new Stack<HObject>();
24.  
    private HDrawingObject selected_drawing_object = new HDrawingObject(250, 250, 100);
25.  
    private HImage image = null;
26.  
    private object stack_lock = new object();
27.  
    HWindow window = null;
28.  
    public Form1()
29.  
    {
30.  
    InitializeComponent();
31.  
    }
32.  
     
33.  
    //ROI内的区域加入Stack中
34.  
    public void AddToStack(HObject obj)
35.  
    {
36.  
    lock (stack_lock)
37.  
    {
38.  
    graphic_stack.Push(obj);
39.  
    }
40.  
    }
41.  
    //
42.  
    public void DisplayResults()
43.  
    {
44.  
    try
45.  
    {
46.  
    hWindowControl1.BeginInvoke((MethodInvoker)(() =>
47.  
    {
48.  
    DisplayGraphicStack();
49.  
    }));
50.  
    }
51.  
    catch (Exception ex)
52.  
    {
53.  
    MessageBox.Show(ex.ToString());
54.  
    }
55.  
    }
56.  
    //
57.  
    private void DisplayGraphicStack()
58.  
    {
59.  
    lock (stack_lock)
60.  
    {
61.  
    HSystem.SetSystem("flush_graphic", "false");
62.  
    window.ClearWindow();
63.  
    while (graphic_stack.Count > 0)
64.  
    {
65.  
    //显示ROI内效果，并移除
66.  
    window.DispObj(graphic_stack.Pop());
67.  
    }
68.  
    HSystem.SetSystem("flush_graphic", "true");
69.  
    }
70.  
    window.DispCross(-10.0, -10.0, 3.0, 0.0);
71.  
    }
72.  
    //
73.  
     
74.  
     
75.  
    private void Form1_Load(object sender, EventArgs e)
76.  
    {
77.  
    window = hWindowControl1.HalconWindow;
78.  
    //图片
79.  
    image = new HImage("fabrik");
80.  
    image.GetImageSize(out HTuple width, out HTuple height);
81.  
    window.SetPart(0, 0, height.I - 1, width.I - 1);
82.  
    window.AttachBackgroundToWindow(image);
83.  
    //
84.  
    this.AttachDrawingObj(selected_drawing_object);
85.  
    }
86.  
     
87.  
    private void AttachDrawingObj(HDrawingObject obj)
88.  
    {
89.  
    //list添加
90.  
    list.Add(obj);
91.  
    //
92.  
    obj.OnAttach(ProcessMethod);
93.  
    obj.OnSelect(OnSelectDrawingObject);
94.  
    obj.OnDrag(ProcessMethod);
95.  
    obj.OnResize(ProcessMethod);
96.  
    //
97.  
    window.AttachDrawingObjectToWindow(obj);
98.  
     
99.  
    }
100.  
     //与委托参数匹配
101.  
     private void OnSelectDrawingObject(HDrawingObject drawid, HWindow window, string type)
102.  
     {
103.  
     selected_drawing_object = drawid;
104.  
      
105.  
     ProcessMethod(drawid, window, type);
106.  
     }
107.  
     private void ProcessMethod(HDrawingObject drawid, HWindow window, string type)
108.  
     {
109.  
     // drawid.SetDrawingObjectParams("color", "blue");
110.  
     //color
111.  
     foreach (HDrawingObject item in list)
112.  
     {
113.  
     //注意事项：改变ROI颜色的时候，一定要通过HDrawingObject对象的ID属性和list中的成员ID进行匹配，
114.  
     //不能直接通过对象==对象的形式进行判断
115.  
     if (item.ID == drawid.ID)
116.  
     {
117.  
     item.SetDrawingObjectParams("color", "blue");
118.  
     }
119.  
     else
120.  
     {
121.  
     item.SetDrawingObjectParams("color", "green");
122.  
     }
123.  
     }
124.  
      
125.  
     HRegion region = new HRegion(drawid.GetDrawingObjectIconic());
126.  
     //加入stack
127.  
     window.SetColor("red");
128.  
     this.AddToStack(image.ReduceDomain(region).Threshold(new HTuple(128), new HTuple(255)));
129.  
     //展示并清空stack
130.  
     this.DisplayResults();
131.  
     }
132.  
     //rec1
133.  
     private void button1_Click(object sender, EventArgs e)
134.  
     {
135.  
     HDrawingObject rec1 = HDrawingObject.CreateDrawingObject(HDrawingObject.HDrawingObjectType.RECTANGLE1,
136.  
     100, 100, 210, 210);
137.  
     this.AttachDrawingObj(rec1);
138.  
     }
139.  
     //rec2
140.  
     private void button2_Click(object sender, EventArgs e)
141.  
     {
142.  
     HDrawingObject rec2 = HDrawingObject.CreateDrawingObject(HDrawingObject.HDrawingObjectType.RECTANGLE2,
143.  
     100, 100, 0, 100, 50);
144.  
     this.AttachDrawingObj(rec2);
145.  
     }
146.  
     //Circle
147.  
     private void button3_Click(object sender, EventArgs e)
148.  
     {
149.  
     HDrawingObject circle = HDrawingObject.CreateDrawingObject(HDrawingObject.HDrawingObjectType.CIRCLE,
150.  
     200, 200, 70);
151.  
     this.AttachDrawingObj(circle);
152.  
     }
153.  
     //清除所有ROI
154.  
     private void button4_Click(object sender, EventArgs e)
155.  
     {
156.  
     lock (stack_lock)
157.  
     {
158.  
     foreach (HDrawingObject dobj in list)
159.  
     {
160.  
     dobj.Dispose();
161.  
     }
162.  
     list.Clear();
163.  
     graphic_stack.Clear();
164.  
     }
165.  
     DisplayGraphicStack();
166.  
     }
167.  
     }
168.  
     }

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