試圖在點擊上畫矩形

-1

所以我一直在自學c＃教程和下面的教程。直到這個時候沒有什麼大問題。 Bun現在我不能自己找到解決方案。試圖在點擊上畫矩形

所以我列出了一個簡單的表單，它應該可以在不同的鼠標點擊上創建矩形和吸引點。但是當我運行代碼時，沒有任何反應。

我無法理解什麼是錯的..請幫助（=

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(); 

     } 
    } 
}

}

來源

2017-11-04 Max Saprykin

這似乎是學習調試的好時機。嘗試設置一些斷點，看看發生了什麼。 – Blorgbeard

mForcePoint是否被更改過？ –

它假設改按人民幣..但還是一無所獲。 –

所以答案很簡單。我譴責的教程，因爲沒有這樣提什麼使以往任何時候。

我只是需要加入（我鼠標點擊方法的名稱）鼠標點擊+ = 要私人Form1中（）

來源

2017-11-06 06:43:19

試圖在點擊上畫矩形

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