winform 中 实现 动态线条背景效果

1.首先创建一个窗体。设置FormBoderStyle为 none;

2.拖入一个panle 到窗体中，设置Dock 属性，让panle填满整个 窗体。修改panel的Name为Login_back

3. 代码

  1 public partial class Login1 : Form
  2     {
  3         private List<PointInfo> list =new List<PointInfo>();
  4         private Random random = new Random();
  5         private Timer timer ;
  6         public Login1()
  7         {
  8             
  9             InitializeComponent();
 10             InitPoint();
 11             InitializeTimer();
 12         }
 13         protected override void OnPaint(PaintEventArgs e)
 14         {
 15             base.OnPaint(e);
 16             DrawBackground(e.Graphics,100);
 17         }
 18         private void DrawBackground(Graphics g,int maxdistance)
 19         {
 20             foreach(var item in list)
 21             {
 22                 Point point = item.Location;
 23                 g.FillEllipse(Brushes.Gray, point.X - 2, point.Y - 2, 4, 4);
 24             }
 25             //连线
 26             Pen pen = new Pen(Color.AliceBlue);
 27             for (int i = 0; i < list.Count; i++)
 28             {
 29                 Point p1 = list[i].Location;
 30                 for (int j = i + 1; j < list.Count; j++)
 31                 {
 32                     Point p2 = list[j].Location;
 33                     double distance = Math.Sqrt(Math.Pow(p1.X - p2.X, 2) + Math.Pow(p1.Y - p2.Y, 2));
 34                     if (distance > maxdistance) continue;
 35 
 36                     pen.Color = Color.FromArgb(200, 200, 200);
 37                     g.DrawLine(pen, p1, p2);
 38 
 39                 }
 40             }
 41             
 42 
 43         }
 44         //初始化点，移动方向和速度
 45         private void InitPoint()
 46         {
 47             //list = new List<Point>();
 48             //random = new Random();
 49             //画点
 50             for(int i = 0; i < 20; i++)
 51             {
 52                 Point point = new Point()
 53                 {
 54                     X = random.Next(ClientSize.Width),
 55                     Y = random.Next(ClientSize.Height)
 56 
 57                 };
 58                 MoveDirection direction = (MoveDirection)random.Next(4);
 59                 int speed = random.Next(1, 2);
 60                 PointInfo pointInfo = new PointInfo { Location = point, Direction = direction, Speed = speed };
 61                 list.Add(pointInfo);
 62             }
 63           
 64 
 65         }
 66         private void InitializeTimer()
 67         {
 68             timer = new Timer();
 69             timer.Interval = 50;
 70             timer.Tick += Timer_Tick;
 71             timer.Start();
 72         }
 73 
 74         private void Timer_Tick(object sender, EventArgs e)
 75         {
 76             UpdatePoints();
 77             Login_back.Invalidate();
 78         }
 79 
 80         //减少闪烁
 81         protected override CreateParams CreateParams
 82         {
 83             get
 84             {
 85                 var cp = base.CreateParams;
 86                 cp.ExStyle |= 0x02000000;
 87                 return cp;
 88             }
 89         }
 90 
 91 
 92 
 93         private void UpdatePoints()
 94         {
 95             foreach (var item in list)
 96             {
 97                 Point point = item.Location;
 98                 MoveDirection direction = item.Direction;
 99                 int speed = item.Speed;
100                 switch (direction)
101                 {
102                     case MoveDirection.Left:
103                         point.X -= speed;
104                         if (point.X < 0) point.X = Login_back.Width;
105                         break;
106                     case MoveDirection.Right:
107                         point.X += speed;
108                         if (point.X > Login_back.Width) point.X = 0;
109                         break;
110                     case MoveDirection.Down:
111                         point.Y += speed;
112                         if (point.Y > Login_back.Height) point.Y = 0;
113                         break;
114 
115                     case MoveDirection.Up:
116                         point.Y -= speed;
117                         if (point.Y < 0) point.Y = Login_back.Height;
118                         break;
119                 }
120                 item.Location = point;
121             }
122           
123         }
124        
125         
126 
127 }

 

4.PointInfo 类  

 1   public class PointInfo
 2     {
 3         public Point Location { get; set; }
 4         public MoveDirection Direction { get; set; }
 5         public int Speed { get; set; }
 6     }
 7 
 8     public enum MoveDirection
 9     {
10         Left,
11         Right,
12         Up,
13         Down
14     }

 5.效果图

 

posted @ 2023-09-14 17:43  赵三毛  阅读(117)  评论(0)  编辑  收藏  举报