想要通过从TXT文件中读取坐标来绘制一条线

本文关键字：坐标 读取 绘制 一条 文件 TXT | 更新日期: 2023-09-27 18:16:49

首先我将解释我在做什么:我正在绘制一条线，然后我正在使用StreamWriter在.txt文件中编写该线的两点的坐标!!然后我打开openFiledialog，并读取保存的。txt文件，其中使用streamReader的坐标是安全的，并在同一事件中放置一些逻辑来绘制线，但它不是绘制线，它一直贯穿异常，我试图将字符串转换为使用解析和tryparse的int，但它没有帮助。有人可以引导我从文本文件读取坐标画一条线吗??怎样才能做到呢?我正在使用MOuseDown Event

绘制一条线

我正在使用下面的代码

     protected void CreateBitmap(int Width, int Height)
    {
        // Create the background bitmap
        BackGroundBitmap = new Bitmap(Width, Height);
        // Set the background bitmap to be the Form's background image
        BackgroundImage = BackGroundBitmap;
    }
string zee1, zee2, zee3, zee4; // Publically declared strings
int m1, n1, m2, n2; // publically declared integers
DialogResult result = openFileDialog1.ShowDialog(); // Show the dialog.
if (result == DialogResult.OK) // Test result.
{
    using (StreamReader Reader = new StreamReader(openFileDialog1.FileName, true))
    {
        zee1 = Reader.ReadLine();
        m1 = int.Parse(zee1);
        zee2 = Reader.ReadLine();
        n1 = int.Parse(zee2);
        zee3 = Reader.ReadLine();
        m2 = int.Parse(zee3);
        zee4 = Reader.ReadLine();
        n2 = int.Parse(zee4);
        Graphics gra = Graphics.FromImage(BackGroundBitmap);
        var Teera = new Pen(Color.Black, 5);
        var Nanga1 = new Point(m1, n1);
        var Nanga2 = new Point(m2, n2);
        gra.DrawLine(Teera, Nanga1, Nanga2);
        Teera.Dispose();
    }
}

想要通过从TXT文件中读取坐标来绘制一条线

好了，经过多次测试，我想出了这个:

using System;
using System.IO;
using System.Drawing;
using System.Windows.Forms;
namespace ProgramTestDrawLine
{
    class Main_Window : Form
    {
        public Main_Window()
        {
            this.Width = 500;
            this.Height = 500;
            this.Paint += Main_Window_Paint;
        }
        void Main_Window_Paint(object sender, EventArgs e)
        {
            StreamReader sr = new StreamReader("points.txt");
            string fileContents = sr.ReadLine();
            sr.Close();
            string[] points = fileContents.Split(',');
            Point a = new Point(int.Parse(points[0]), int.Parse(points[1]));
            Point b = new Point(int.Parse(points[2]), int.Parse(points[3]));
            Graphics g = this.CreateGraphics();
            g.DrawLine(new Pen(Brushes.Black,2),a, b);
        }
    }
    class Main_W
    {
        static void Main()
        {
            Main_Window form = new Main_Window();
            Application.EnableVisualStyles();
            Application.Run(form);
        }
    }
}

points.txt文件包含以下单行内容:

15300300

至少对我来说，这是可行的。尝试使用表单。绘制事件，而不是你正在使用的任何其他(我想你正在使用的是窗体。加载事件，这是我最初使用的，它没有绘制线)

Using point &float代替Point &这会有帮助的。下面的代码。

编辑-保存图像，然后将其设置为表单的背景。

protected void CreateBitmap(int Width, int Height) 
{ 
    // Create the background bitmap 
    BackGroundBitmap = new Bitmap(Width, Height);           
    // Set the background bitmap to be the Form's background image 
    BackgroundImage = BackGroundBitmap; 
} 

private void button1_Click(object sender, EventArgs e)
{
    CreateBitmap(500, 500);
    string zee1, zee2, zee3, zee4; // Publically declared strings
    float m1, n1, m2, n2; // publically declared integers
    DialogResult result = openFileDialog1.ShowDialog(); // Show the dialog.
    if (result == DialogResult.OK) // Test result.
    {
        using (StreamReader Reader = new StreamReader(openFileDialog1.FileName, true))
        {
            zee1 = Reader.ReadLine();
            m1 = float.Parse(zee1);
            zee2 = Reader.ReadLine();
            n1 = float.Parse(zee2);
            zee3 = Reader.ReadLine();
            m2 = float.Parse(zee3);
            zee4 = Reader.ReadLine();
            n2 = float.Parse(zee4);

            Graphics gra = Graphics.FromImage(BackGroundBitmap);
            var Teera = new Pen(Color.Black, 5);
            var Nanga1 = new PointF(m1, n1);
            var Nanga2 = new PointF(m2, n2);
            gra.DrawLine(Teera, Nanga1, Nanga2);
            BackGroundBitmap.Save("result.jpg");
            BackgroundImage = Image.FromFile("result.jpg");
            Teera.Dispose();
        }
    }
}

经过多次实验，我终于找到了答案。如果有人遇到问题，我已经使用了图片框并将其设置为禁用。我也可以用一个面板。但图片盒的目的。首先，我从一个文本文件读取，然后这些坐标被传递给DrawLine，因此最终它绘制线。感谢所有评论和回答的人。真的很有帮助。

下面是代码: 
    private System.Drawing.Graphics g;
    private System.Drawing.Pen pen1 = new System.Drawing.Pen(Color.Blue, 5);
    private void menuItem9_Click(object sender, EventArgs e)
    {
        DialogResult result = openFileDialog1.ShowDialog(); // Show the dialog.
        if (result == DialogResult.OK) // Test result.
        {
            using (StreamReader Reader = new StreamReader(openFileDialog1.FileName, true))
            {
                 zee1 = Reader.ReadLine();
                textBox1.Text = Convert.ToString(zee1);
                u1 = float.Parse(zee1);
                zee2 = Reader.ReadLine();
                textBox2.Text = zee2;
                v1 = float.Parse(zee2);
                zee3 = Reader.ReadLine();
                textBox3.Text = zee3;
                u2 = float.Parse(zee3);
                zee4 = Reader.ReadLine();
                textBox4.Text = zee4;
                v2 = float.Parse(zee4);
                Reader.Close();

                //BackGroundBitmap.Save("result.jpg"); //test if ok
                pictureBox1.Enabled = true;
                g = pictureBox1.CreateGraphics();
                g.DrawLine(pen1, int.Parse(textBox1.Text), int.Parse(textBox2.Text), int.Parse(textBox3.Text), int.Parse(textBox4.Text));
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