鼠标移动放大镜效果
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows.Forms;
namespace dataSource
{
public partial class PictureForm : Form
{
Thread thDraw;
delegate void myDrawRectangel();
myDrawRectangel mydraw;
private Point ptBegin = new Point();
private bool blIsDrawRectangle = true;
public PictureForm()
{
InitializeComponent();
}
private void PictureForm_Load(object sender, EventArgs e)
{
//图片背景初始化
// this.pictureBox1.Image = System.Drawing.Image.FromFile(@"D:\Image\MianPic.bmp");
mydraw = new myDrawRectangel(ShowDrawRectangle);
thDraw = new Thread(Run);
thDraw.Start();
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
if (blIsDrawRectangle)
{
e.Graphics.DrawRectangle(new Pen(Brushes.Black, 1), ptBegin.X, ptBegin.Y, 50, 50);
}
}
private void Run()
{
while (true)
{
if (pictureBox1.Image != null)
{
this.BeginInvoke(mydraw);
}
Thread.Sleep(50);
}
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
if (thDraw != null)
{
thDraw.Abort();
}
}
private void ShowDrawRectangle()
{
Rectangle rec = new Rectangle(ptBegin.X * pictureBox1.Image.Size.Width /220, ptBegin.Y * pictureBox1.Image.Size.Height / 300,
50 * pictureBox1.Image.Size.Width / 400, 50 * pictureBox1.Image.Size.Height / 300);
Graphics g = pictureBox2.CreateGraphics();
g.DrawImage(pictureBox1.Image, pictureBox2.ClientRectangle, rec, GraphicsUnit.Pixel);
g.Flush();
}
private void pictureBox1_MouseLeave(object sender, EventArgs e)
{
blIsDrawRectangle = false;
pictureBox1.Refresh();
}
private void pictureBox1_MouseEnter(object sender, EventArgs e)
{
blIsDrawRectangle = true;
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (e.X - 25 <= 0)
{
ptBegin.X = 0;
}
else if (pictureBox1.Size.Width - e.X <= 25)
{
ptBegin.X = pictureBox1.Size.Width-50;
}
else
{
ptBegin.X = e.X - 25;
}
if (e.Y - 25 <= 0)
{
ptBegin.Y = 0;
}
else if (pictureBox1.Size.Height - e.Y <= 25)
{
ptBegin.Y = pictureBox1.Size.Height - 50;
}
else
{
ptBegin.Y = e.Y - 25;
}
pictureBox1.Refresh();
}
}
}