转换在平移和缩放事件上C＃cyotek图像框控件上绘制的图形

问题描述

我当前正在使用Cyotek图像框在图像上方绘制图形，并且想要变换图形（在平移事件上变换图形，在缩放事件上变换图形）。我的印象是我必须重写图像框类的方法，但是由于类非常广泛，我感到很迷惑。如果有人对此有经验，可以提供替代方法，或者可以提供有关此问题的任何见解，将不胜感激。下面是我在图像框中绘制的代码，以及绘制后图形外观的图像。

预先感谢

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.VisualBasic;
using System.Diagnostics;

namespace SPEL_Mi
{
    public partial class TracerForm : Form
    {
        private List<Point> polygon;
        private double scale;
        private int counter = 0;
        private readonly Graphics g;
        private Point lastMousePos;
        private bool _imageInserted = false;
        private Matrix transform = new Matrix();
        private float m_dZoomscale = 1.0f;
        public const float s_dScrollValue = 0.1f;
        private Stopwatch s = new Stopwatch();
        private List<int> times = new List<int>();
        public bool imageInserted
        {
            get { return _imageInserted;  }
            set { _imageInserted = value; }
        }

        public TracerForm()
        {
            InitializeComponent();
            polygon = new List<Point>();
            imageInserted = false;
            scale = 1.0f;
            g = imgCatchment.CreateGraphics();
            lastMousePos = Point.Empty;
        }

        private void TracerForm_Load(object sender,EventArgs e)
        {
        }

        public void setImage(Image image)
        {
            this.imgCatchment.Image = image;
        }


        private double distance(Point p1,Point p2)
        {
            return Math.Sqrt(Math.Pow(p2.X - p1.X,2) + Math.Pow(p2.Y - p1.Y,2));
        }

        // This function uses the shoelace formula to calculate the area of a polygon given it's vertices
        private double calcArea(List<Point> vertices)
        {
            double area = 0.0f;
            int j = vertices.Count - 1;
            for (int i = 0; i < vertices.Count; i++)
            {
                area += (vertices[j].X + vertices[i].X) * (vertices[j].Y - vertices[i].Y);
                j = i;
            }
            return Math.Abs(area / (2.0 * Math.Pow(scale,2)));
        }

        private void TracerForm_FormClosing(object sender,FormClosingEventArgs e)
        {
            if(Application.OpenForms.Count == 2)
            {
                Application.Exit();
            }
        }

        public void DrawPoint(Graphics G,PointF pt,Pen pen)
        {
            using (SolidBrush brush = new SolidBrush(pen.Color))
            {
                float pw = pen.Width;
                float pr = pw / 2f;
                G.FillEllipse(brush,new RectangleF(pt.X - pr,pt.Y - pr,pw,pw));
            }
        }

        private void imgCatchment_MouseDoubleClick(object sender,MouseEventArgs e)
        {
            if (polygon.Count > 2)
            {
                string area = Math.Round(calcArea(polygon),3).ToString();
                //lblArea.Text = area + "sqm";
                //lstSoureNodes.Items.Add(new ListViewItem(new String[] { area }));
            }
            else
            {
                imgCatchment.Invalidate();
            }
            polygon.Clear();
            counter = 0;
        }

        private void imgCatchment_MouseMove(object sender,MouseEventArgs e)
        {
            lastMousePos = e.Location;
            if (e.Button == MouseButtons.None)
            {
                if (polygon.Count >= 1)
                {
                    imgCatchment.Invalidate();
                    g.DrawLine(new Pen(Color.Black,3),polygon[0],lastMousePos);
                    if (polygon.Count > 2)
                    {
                        g.DrawLine(new Pen(Color.Black,polygon[polygon.Count - 1],lastMousePos);
                    }
                }
            }
        }

        private void imgCatchment_MouseClick(object sender,MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                if (!imageInserted)
                {
                    Interaction.MsgBox("Please insert an image first",MsgBoxStyle.Critical,"Image required");
                }
                else
                {
                    if (counter < 2)
                    {
                        if (counter == 0)
                        {
                            //lblArea.Text = string.Empty;
                            imgCatchment.Invalidate();
                            polygon.Add(e.Location);
                        }
                        else
                        {
                            double pxlDistance = distance(polygon[0],e.Location);
                            double actualDistance;
                            try
                            {
                                actualDistance = Convert.ToDouble(Interaction.InputBox("What distance does this correspond to in metres?","Actual Distance"));
                            }
                            catch (FormatException)
                            {
                                Interaction.MsgBox("Numeric value required,actual distance set to 1","Numeric value required");
                                actualDistance = 1;
                            }
                            if (actualDistance < 0)
                            {
                                Interaction.MsgBox("Positive value required,"Positive value required");
                                actualDistance = 1;
                            }
                            else
                            {
                                scale = pxlDistance / actualDistance;
                            }
                            imgCatchment.Invalidate();
                            polygon.Clear();
                        }
                        counter++;
                    }
                    else
                    {
                        polygon.Add(e.Location);
                    }
                }
            }
        }

        private void imgCatchment_Paint(object sender,PaintEventArgs e)
        {
            if (polygon.Count >= 1)
            {
                if (polygon.Count > 1)
                {
                    for (int i = 0; i < polygon.Count - 1; i++)
                    {
                        e.Graphics.DrawLine(new Pen(Color.Black,polygon[i],polygon[i + 1]);
                    }
                    e.Graphics.DrawLine(new Pen(Color.Black,lastMousePos);
                }
                e.Graphics.DrawLine(new Pen(Color.Black,lastMousePos);
            }
        }
    }
}
'''
[Drawn graphics][1]


  [1]: https://i.stack.imgur.com/JjKuE.jpg

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）