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C#自定义事件模拟风吹草摇摆效果

2020-01-24 00:33:20
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这是一个自定义事件的例子。C#、WinForm、Visual Studio 2017。

在HoverTreeForm中画一块草地,上面有许多草(模拟)。

HewenqiTianyi类模拟天气,会引发“风”事件(HoverTreeWindEvent),风有东风或西风,或静止。

当吹东风,草往西边倒,吹西风则往东边到。静止则草不会东歪西倒。

草地上每一颗草都监听HoverTreeWindEvent事件,根据风向(WindDdirection)调整姿态。

HewenqiTianyi中有定时器,每隔一段时间触发调整风向的事件。

由于监听到的“风”事件不是WinForm中的线程,要改变WinForm中“草”的姿态,

使用了BeginInvoke方法和委托,在WinForm线程外访问控件。具体看HoverTreeGrass用户控件。

效果图:

HewenqiTianyi类代码:

using System;using System.Timers;namespace TianYiHeWenQi{  class HewenqiTianyi  {    public static event ActionEventHandler HoverTreeWindEvent;    WindEventArgs _arg = new WindEventArgs();    public HewenqiTianyi()    {      Timer h_timer = new Timer();      h_timer.Interval = 3000;      h_timer.Elapsed += H_timer_Elapsed;      h_timer.Start();    }    Random _HoverClock=new Random ();    private void H_timer_Elapsed(object sender, ElapsedEventArgs e)    {      _arg.WindType = (WindDdirection)(_HoverClock.Next(3));      OnAction(_arg);    }    protected void OnAction(WindEventArgs ev)    {      HoverTreeWindEvent?.Invoke(ev);      //相当于以下代码      //if (HoverTreeWindEvent != null)      //{      //  HoverTreeWindEvent(ev);      //}    }  }  class WindEventArgs : EventArgs  {    public WindDdirection WindType { get; set; }  }  enum WindDdirection  {    East,    West,    Static  }  delegate void ActionEventHandler(WindEventArgs ev);}

自定义用户控件代码:

using System;using System.Windows.Forms;namespace TianYiHeWenQi{  public partial class HoverTreeGrass : UserControl  {    delegate void MySetText(string text);    public HoverTreeGrass()    {      InitializeComponent();      HewenqiTianyi.HoverTreeWindEvent += HewenqiTianyi_HoverTreeWindEvent;    }    private void UpdateLabel(WindDdirection wd)    {      if (label_grass.InvokeRequired)      {        // 当一个控件的InvokeRequired属性值为真时,说明有一个创建它以外的线程想访问它        Action<WindDdirection> actionDelegate = (x) => {          switch (x)          {            case WindDdirection.East:              label_grass.Location = new System.Drawing.Point(40 - 9, label_grass.Location.Y);              label_grass.Text="//";              break;            case WindDdirection.West:              label_grass.Location = new System.Drawing.Point(40+9, label_grass.Location.Y);              label_grass.Text = "/";              break;            case WindDdirection.Static:              label_grass.Location = new System.Drawing.Point(40, label_grass.Location.Y);              label_grass.Text = "|";              break;          }        };        // 或者        // Action<string> actionDelegate = delegate(string txt) { this.label_grass.Text = txt; };        this.label_grass.BeginInvoke(actionDelegate, wd);      }      else      {        switch (wd)        {          case WindDdirection.East:            label_grass.Text = "//";            break;          case WindDdirection.West:            label_grass.Text = "/";            break;          case WindDdirection.Static:            label_grass.Text = "|";            break;        }      }    }    private void HewenqiTianyi_HoverTreeWindEvent(WindEventArgs ev)    {      UpdateLabel(ev.WindType);    }  }}

HoverTreeForm窗体代码:

using System.Windows.Forms;namespace TianYiHeWenQi{  public partial class HoverTreeForm : Form  {    public HoverTreeForm()    {      InitializeComponent();      for (int i = 0; i < tableLayoutPanel_hovertree.ColumnCount; i++) {        for (int j = 0; j < tableLayoutPanel_hovertree.RowCount; j++) {          tableLayoutPanel_hovertree.Controls.Add(new HoverTreeGrass(), i, j);        }      }      HewenqiTianyi h_ty = new HewenqiTianyi();    }  }}

源码下载:http://xiazai.VeVB.COm/201707/yuanma/TianYiHeWenQi.rar

总结

以上所述是小编给大家介绍的C#自定义事件模拟风吹草摇摆效果,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对武林网网站的支持!

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