C#在图片上画线

最新推荐文章于 2023-02-23 00:30:26 发布

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此博客展示了一段C#代码，实现了在Windows窗体应用中打开图片并在图片上绘制线条的功能。通过点击按钮可选择图片，再点击另一按钮能在图片上绘制红色线条，包括水平、垂直和对角线。

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace drawLine
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
pictureBox1.Image = Image.FromFile(openFileDialog1.FileName);
}
}

private void button2_Click(object sender, EventArgs e)
{
if (pictureBox1.Image != null)
{
Bitmap bt = new Bitmap(pictureBox1.Image);
Graphics g = Graphics.FromImage(bt);
g.DrawLine(new Pen(Color.Red, 40), new Point(0,bt.Height/2), new Point(bt.Width,bt.Height/2));
g.DrawLine(new Pen(Color.Red, 40), new Point(bt.Width/2,0), new Point(bt.Width/2, bt.Height));
g.DrawLine(new Pen(Color.Red, 40), new Point(0, 0), new Point(bt.Width, bt.Height));
g.DrawLine(new Pen(Color.Red, 40), new Point(0,bt.Height), new Point(bt.Width,0));
pictureBox1.Image = bt;
}
}
}
}