winfrom-绘制矩形并移动

缺乏、安全感 2022-07-12 01:09 206阅读 0赞

using System;
    using System.Drawing;
    using System.Windows.Forms;
    
    namespace WindowsFormsApplication2
    {
        public partial class ang : Form
        {
            bool isMove = false;
            private Rectangle m_Rect;
            private Point m_LastMSPoint;
    
            public ang()
            {
                InitializeComponent();
    
                DoubleBuffered = true;
                this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.UserPaint, true);
                m_Rect = new Rectangle(10, 10, 50, 30);
            }
    
            protected override void OnPaint(PaintEventArgs e)
            {
                e.Graphics.FillRectangle(SystemBrushes.ControlDark, this.m_Rect);
                e.Graphics.DrawRectangle(SystemPens.ControlDarkDark, this.m_Rect);
    
                //Rectangle r = e.ClipRectangle;
                //this.label1.Text = r.X + "," + r.Y;
            }
    
            protected override void OnMouseDown(MouseEventArgs e)
            {
                base.OnMouseDown(e);
    
                if (m_Rect.Contains(e.Location))
                {
                    this.m_LastMSPoint = e.Location;
    
                    isMove = true;//注意要加在这里
                    Cursor = Cursors.SizeAll;
                }
                else
                {
                    return;
                }
            }
    
            protected override void OnMouseMove(MouseEventArgs e)
            {
                base.OnMouseMove(e);
    
                if (e.Button != MouseButtons.Left)
                {
                    return;
                }
    
                if (isMove == true)
                {
                    this.label1.Text = m_LastMSPoint.X + "," + m_LastMSPoint.Y + " ; " + e.Location.X + "," + e.Location.Y;
    
                    this.m_Rect.Offset(e.Location.X - this.m_LastMSPoint.X, e.Location.Y - this.m_LastMSPoint.Y);
                    this.Invalidate();
    
                    this.m_LastMSPoint = e.Location;
                }
            }
    
            protected override void OnMouseUp(MouseEventArgs e)
            {
                isMove = false;
                Cursor = Cursors.Default;
            }
        }
    }

![SouthEast][]

[SouthEast]: /images/20220711/8cb8390052524542ada8a00bbcb75aed.png