试图在点击上画矩形

-1

所以我一直在自学c＃教程和下面的教程。直到这个时候没有什么大问题。 Bun现在我不能自己找到解决方案。试图在点击上画矩形

所以我列出了一个简单的表单，它应该可以在不同的鼠标点击上创建矩形和吸引点。但是当我运行代码时，没有任何反应。

我无法理解什么是错的..请帮助（=

public partial class Form1 : Form 
{ 

    float mRectSize = 50; 
    List<RectangleF> mRectangles = new List<RectangleF>(); 
    Random rnd = new Random(); 
    PointF mForcePoint = new PointF(-1, -1); 
    bool mForcePush = false; 
    int mRandomSeed = 10; 

    public Form1() 
    { 
     InitializeComponent(); 
     Timer timer1 = new Timer(); 
     timer1.Interval = 1; 
     timer1.Tick += Timer1_Tick; 
     timer1.Start(); 


    } 

    private void AddRectangle(PointF pos) 
    { 

     mRectangles.Add(new RectangleF(pos.X - mRectSize/2, pos.Y - mRectSize/2, mRectSize, mRectSize)); 
    } 

    private void AddForcePoint(PointF pos) 
    { 
     mForcePoint = pos; 
    } 

    private void DrawRectangle(Graphics g, RectangleF rect) 
    { 
     Color c = Color.FromArgb(255, rnd.Next(255), rnd.Next(255), rnd.Next(255)); 
     g.FillRectangle(new SolidBrush(c), rect); 
    } 

    private PointF RandomiseDirection(PointF dir) 
    { 
     dir.X += rnd.Next(2 * mRandomSeed) - mRandomSeed; 
     dir.Y += rnd.Next(2 * mRandomSeed) - mRandomSeed; 

     return dir; 
    } 

    private void Form1_Paint(object sender, PaintEventArgs e) 
    { 
     Graphics g = e.Graphics; 

     foreach (RectangleF rect in mRectangles) 
     { 
      DrawRectangle(g, rect); 
     } 
    } 

    private void Form1_MouseDown(object sender, MouseEventArgs e) 
    { 
     if (e.Button == System.Windows.Forms.MouseButtons.Left) 
     { 
      AddRectangle(e.Location); 
      //MessageBox.Show("test"); 
      Invalidate(); 
     } 

     if (e.Button == System.Windows.Forms.MouseButtons.Right) 
     { 
      AddForcePoint(e.Location); 
     } 

     if (e.Button == System.Windows.Forms.MouseButtons.Middle) 
     { 
      mForcePush = !mForcePush; 
     } 

    } 

    private void Timer1_Tick(object sender, EventArgs e) 
    { 
     if (mForcePoint.X != -1 && mForcePoint.Y != -1) 
     { 
      for (int i = 0; i < mRectangles.Count; i++) 
      { 
       RectangleF rect = mRectangles[i]; 

       PointF direction = new PointF(mForcePoint.X - rect.Location.X, mForcePoint.Y - rect.Location.Y); 

       direction = RandomiseDirection(direction); 

       if (mForcePush) 
       { 
        rect.Location = new PointF(rect.Location.X - direction.X * 0.1f, rect.Location.Y - direction.Y * 0.1f); 
       } 

       else 
       { 
        rect.Location = new PointF(rect.Location.X + direction.X * 0.1f, rect.Location.Y + direction.Y * 0.1f); 
       } 

       mRectangles[i] = rect; 

      } 

      Invalidate(); 

     } 
    } 
}

}

来源

2017-11-04 Max Saprykin

这似乎是学习调试的好时机。尝试设置一些断点，看看发生了什么。 – Blorgbeard

mForcePoint是否被更改过？ –

它假设改按人民币..但还是一无所获。 –

所以答案很简单。我谴责的教程，因为没有这样提什么使以往任何时候。

我只是需要加入（我鼠标点击方法的名称）鼠标点击+ = 要私人Form1中（）

来源

2017-11-06 06:43:19

试图在点击上画矩形

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