C#在picturebox上画一个矩形，并跟随鼠标拖动
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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 T392419114 { public partial class Form1 : Form { private int x = 100; private int y = 100; private int w = 120; private int h = 80; public Form1() { InitializeComponent(); pictureBox1.Refresh(); } int dx = 0; int dy = 0; private void pictureBox1_MouseMove(object sender, MouseEventArgs e) { if (e.X >= x && e.X <= x + w && e.Y >= y && e.Y <= y + h) { this.Cursor = Cursors.Hand; if (e.Button == System.Windows.Forms.MouseButtons.Left) { x = e.X - dx; y = e.Y - dy; pictureBox1.Refresh(); } else { dx = e.X - x; dy = e.Y - y; } } else { if (e.Button == System.Windows.Forms.MouseButtons.None) this.Cursor = Cursors.Default; } } private void pictureBox1_Paint(object sender, PaintEventArgs e) { base.OnPaint(e); Graphics sss = e.Graphics; Pen testpen = new Pen(Color.Red, 3); sss.DrawRectangle(testpen, x, y, w, h); } } } |
完整代码：https://download.csdn.net/download/caozhy/10557637
