winfrom-拖动鼠标绘制矩形

最新推荐文章于 2023-04-10 20:20:56 发布

joyhen

最新推荐文章于 2023-04-10 20:20:56 发布

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分类专栏： Winfrom

本文链接：https://blog.youkuaiyun.com/Joyhen/article/details/54908673

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本文介绍如何在Windows Form应用中实现鼠标拖动绘制矩形的功能。通过捕捉鼠标按下、移动和释放事件，动态更新图形界面，创建自定义的绘图交互体验。

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    //http://bbs.youkuaiyun.com/topics/390567044
    //http://heisetoufa.iteye.com/blog/380977
    //http://blog.youkuaiyun.com/xuyongbeijing2008/article/details/17371311

    public partial class Form2 : Form
    {
        bool bDrawStart = false;
        Point pointStart = Point.Empty;
        Point pointContinue = Point.Empty;
        Dictionary<Point, Point> dicPoints;

        public Form2()
        {
            InitializeComponent();

            dicPoints = new Dictionary<Point, Point>();
            DoubleBuffered = true;
            this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.UserPaint, true);

            this.MouseDown += new MouseEventHandler(frmMain_MouseDown);
            this.MouseMove += new MouseEv

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