基于WinForm+Halcon实现图像缩放与交互功能_C#

前言

本文将通过具体实例，详细介绍如何在 winform +halcon 中实现图像的缩放、平移以及实时显示灰度值等交互功能，帮助大家快速掌握这一实用技能，提升图像处理应用的开发效率和用户体验。

初始化窗口

1、图片控件为winform中的picturebox控件时：

需要调用halcon算子openwindow来初始化窗口，使winform中的图片窗口转换为适用于halcon的图片窗口。

2、图片控件为halcon中的hwindowcontrol控件时：

无需进行窗口转换，可直接按照如下方式调用。

windowid = hwindowcontrol1.halconwindow。

添加图像缩放功能

打开form窗体——查看图片控件属性——点击"事件"选项——找到鼠标滚轮滑动的事件，双击创建响应函数——将相应的代码放在刚刚添加的函数中，如下图所示：

添加图像平移功能

按照上述步骤分别找到鼠标"按下"与"抬起"的事件，分别双击创建响应函数，然后将相应的代码放在刚刚添加的函数中。

如下图所示：

添加实时显示灰度值功能

按照上述步骤找到鼠标移动的事件，双击创建响应函数——在界面上添加一个"label"控件，然后将相应的代码放在刚刚添加的函数中。

示例代码

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows.forms;
using halcondotnet;

namespace csharpandhalcon12
{
    public partial class form1 : form
    {
        htuple windowid, imagewidth, imageheight;
        private double rowdown;
        //鼠标按下时的行坐标
        private double coldown;
        //鼠标按下时的列坐标
        hobject ho_image;      
        //图像变量

        public form1()
        {
            initializecomponent();
            createhalconwindow();
        }

        //创建halcon窗口
        public void createhalconwindow()
        {
           /////图片控件为winform中的picturebox控件时/
            //htuple fatherwindow = this.hwindowcontrol1.handle;
            //hoperatorset.setwindowattr("background_color", "green");
            //hoperatorset.openwindow(0, 0, this.hwindowcontrol1.width, this.hwindowcontrol1.height, fatherwindow, "visible", "", out windowid);

            //图片控件为halcon中的hwindowcontrol控件时/
            windowid = hwindowcontrol1.halconwindow;
        }
        //读图
        private void button1_click(object sender, eventargs e)
        {
            openfiledialog openfiledialog = new openfiledialog();
            //openfiledialog.filter = "jpeg文件|*.jpg*|bmp文件|*.bmp*|tiff文件|*.tiff*";
            openfiledialog.filter = "所有图像文件 | *.bmp; *.pcx; *.png; *.jpg; *.gif;*.tif; *.ico; *.dxf; *.cgm; *.cdr; *.wmf; *.eps; *.emf";
            if (openfiledialog.showdialog() == dialogresult.ok)
            {
                htuple imagepath = openfiledialog.filename;
                hoperatorset.readimage(out ho_image, imagepath);
            }
            hoperatorset.getimagesize(ho_image, out imagewidth, out imageheight);
            hoperatorset.setpart(windowid, 0, 0, imageheight, imagewidth);
            hoperatorset.dispobj(ho_image, windowid);
        }
        //缩放图像
        private void hwindowcontrol1_hmousewheel(object sender, hmouseeventargs e)
        {
            htuple zoom, row, col, button;
            htuple row0, column0, row00, column00, ht, wt, r1, c1, r2, c2;
            if (e.delta > 0)
            {
                zoom = 1.5;
            }
            else
            {
                zoom = 0.5;
            }
            hoperatorset.getmposition(windowid, out row, out col, out button);
            hoperatorset.getpart(windowid, out row0, out column0, out row00, out column00);
            ht = row00 - row0;
            wt = column00 - column0;
            if (ht * wt < 32000 * 32000 || zoom == 1.5)
            //普通版halcon能处理的图像最大尺寸是32k*32k。如果无限缩小原图像，导致显示的图像超出限制，则会造成程序崩溃
            {
                r1 = (row0 + ((1 - (1.0 / zoom)) * (row - row0)));
                c1 = (column0 + ((1 - (1.0 / zoom)) * (col - column0)));
                r2 = r1 + (ht / zoom);
                c2 = c1 + (wt / zoom);
                hoperatorset.setpart(windowid, r1, c1, r2, c2);
                hoperatorset.clearwindow(windowid);
                hoperatorset.dispobj(ho_image, windowid);
            }
        }
        //鼠标按下，记录当前坐标值
        private void hwindowcontrol1_hmousedown(object sender, hmouseeventargs e)
        {
            htuple row, column, button;
            hoperatorset.getmposition(windowid, out row, out column, out button);
            rowdown = row;    
            //鼠标按下时的行坐标
            coldown = column; 
            //鼠标按下时的列坐标
        }
        //鼠标抬起，实现图像移动
        private void hwindowcontrol1_hmouseup(object sender, hmouseeventargs e)
        {
            htuple row1, col1, row2, col2,row, column, button;
            hoperatorset.getmposition(windowid, out row, out column, out button);
            double rowmove = row - rowdown;   
            //鼠标弹起时的行坐标减去按下时的行坐标，得到行坐标的移动值
            double colmove = column - coldown;
            //鼠标弹起时的列坐标减去按下时的列坐标，得到列坐标的移动值
            hoperatorset.getpart(windowid, out row1, out col1, out row2, out col2);
            //得到当前的窗口坐标
            hoperatorset.setpart(windowid, row1 - rowmove, col1 - colmove, row2 - rowmove, col2 - colmove);
            //这里可能有些不好理解。以左上角原点为参考点
            hoperatorset.clearwindow(windowid);
            if (imageheight != null)
            {
                hoperatorset.dispobj(ho_image, windowid);
            }
            else
            {
                messagebox.show("请加载一张图片");
            }      
        }
        //鼠标移动，实时显示当前坐标与灰度值
        private void hwindowcontrol1_hmousemove(object sender, hmouseeventargs e)
        {
            htuple row, column, button, pointgray;
            hoperatorset.getmposition(windowid, out row, out column, out button);              //获取当前鼠标的坐标值
            if (imageheight != null && (row > 0 && row < imageheight) && (column > 0 && column < imagewidth))
            //设置3个条件项，防止程序崩溃。
            {
                hoperatorset.getgrayval(ho_image, row, column, out pointgray);                 //获取当前点的灰度值
            }
            else
            {
                pointgray = "_";
            }
            string str = string.format("row:{0}  column:{1}  gray:{2}", row, column, pointgray); //格式化字符串
            label1.text = str;                                                                   //在label控件上显示数值        
        }
        //全屏显示图像,使缩放后的图像回到原始大小
        private void button_fullwindow_click(object sender, eventargs e)
        {
            hoperatorset.setpart(windowid, 0, 0, imageheight - 1, imagewidth - 1);
            hoperatorset.clearwindow(windowid);
            hoperatorset.dispobj(ho_image, windowid);
        }
    }
}