Winform圖片區域性放大效果
阿新 • • 發佈:2019-02-20
有兩個picturebox控制元件,name預設沒有修改。其中picturebox1的img賦予初始值,picturebox2的visible=false;其餘不變,程式比較簡單,看以參考下。
[csharp] view plain copy print?- 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.Threading.Tasks;
- using System.Windows.Forms;
- namespace 區域性放大
- {
- public partial class Form1 : Form
- {
- Thread thDraw;
- delegatevoid myDrawRectangel();
- myDrawRectangel mydraw;
- private Point ptBegin = new Point();
- private
- public Form1()
- {
- InitializeComponent();
- }
- privatevoid pictureBox1_Paint(object sender, PaintEventArgs e)
- {
- //畫矩形 初始值為false否則 一開始就會顯示矩形框
- if (blIsDrawRectangle)
- {
- e.Graphics.DrawRectangle(new
- }
- }
- privatevoid Form1_Load(object sender, EventArgs e)
- {
- mydraw = new myDrawRectangel(ShowDrawRectangle);
- thDraw = new Thread(Run);
- thDraw.Start();
- }
- privatevoid Run()
- {
- while (true)
- {
- if (pictureBox1.Image != null)
- {
- this.BeginInvoke(mydraw);
- }
- Thread.Sleep(50);
- }
- }
- privatevoid Form1_FormClosed(object sender, FormClosedEventArgs e)
- {
- if (thDraw != null)
- {
- thDraw.Abort();
- }
- }
- privatevoid ShowDrawRectangle()
- {
- Rectangle rec = new Rectangle(ptBegin.X * pictureBox1.Image.Size.Width / 460, ptBegin.Y * pictureBox1.Image.Size.Height / 350,
- 50 * pictureBox1.Image.Size.Width / 460, 50 * pictureBox1.Image.Size.Height / 350);
- Graphics g = pictureBox2.CreateGraphics();
- g.DrawImage(pictureBox1.Image, pictureBox2.ClientRectangle, rec, GraphicsUnit.Pixel);
- g.Flush();
- }
- privatevoid pictureBox1_MouseLeave(object sender, EventArgs e)
- {
- pictureBox2.Visible = false;
- blIsDrawRectangle = false;
- pictureBox1.Refresh();
- }
- privatevoid pictureBox1_MouseEnter(object sender, EventArgs e)
- {
- pictureBox2.Visible = true;
- blIsDrawRectangle = true;
- }
- privatevoid pictureBox1_MouseMove(object sender, MouseEventArgs e)
- {
- if (e.X - 25 <= 0)
- {
- ptBegin.X = 0;
- }
- elseif (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;
- }
- elseif (pictureBox1.Size.Height - e.Y <= 25)
- {
- ptBegin.Y = pictureBox1.Size.Height - 50;
- }
- else
- {
- ptBegin.Y = e.Y - 25;
- }
- pictureBox1.Refresh();
- }
- }
- }