c# 十字光标定位 实例

winform程序 实现了 十字光标定位

public partial class Frm_Main : Form { public Frm_Main() { InitializeComponent(); } Image myImage; private void button1_Click(object sender, EventArgs e) { //设置文件的类型 openFileDialog1.Filter = "*.jpg,*.jpeg,*.bmp,*.gif,*.ico,*.png,*.tif,*.wmf|*.jpg;*.jpeg;*.bmp;*.gif;*.ico;*.png;*.tif;*.wmf"; openFileDialog1.ShowDialog(); //打开文件对话框 myImage = System.Drawing.Image.FromFile(openFileDialog1.FileName); //根据文件的路径实例化Image类 pictureBox1.Image = myImage; //显示打开的图片 pictureBox1.Height = myImage.Height; //根据图片大小设置pictureBox1控件的高度 pictureBox1.Width = myImage.Width; //根据图片大小设置pictureBox1控件的宽度 } private void pictureBox1_MouseDown(object sender, MouseEventArgs e) { Graphics myGraphics = pictureBox1.CreateGraphics(); //通过调用Graphics对象的DrawLine方法实现鼠标十字定位功能 myGraphics.DrawLine(new Pen(Color.Black, 1), new Point(e.X, 0), new Point(e.X, e.Y)); myGraphics.DrawLine(new Pen(Color.Black, 1), new Point(e.X, e.Y), new Point(e.X, pictureBox1.Height - e.Y)); myGraphics.DrawLine(new Pen(Color.Black, 1), new Point(0, e.Y), new Point(e.X, e.Y)); myGraphics.DrawLine(new Pen(Color.Black, 1), new Point(e.X, e.Y), new Point(pictureBox1.Width - e.X, e.Y)); } private void pictureBox1_MouseUp(object sender, MouseEventArgs e) { pictureBox1.Image = myImage;//显示原来的图片 pictureBox1.Height = myImage.Height;//设置控件的高度 pictureBox1.Width = myImage.Width; //设置控件的宽度 } }