沿着一条线移动一个图片框 [英] Move a picturebox along a line

问题描述

嗨
我想用计时器沿着一条线移动一个图片框。我有2分作为起点和终点。下面的代码移动了图片框，但没有沿着我的行移动：



我尝试过：

< pre lang =   C＃> Point _start; 
 Point _end; 
  int  _interval =  7 ; 
 Point _middle; 
  double 弧度; 
  private   void  timer1_Tick（ object  sender，EventArgs e）
 {
 _middle.X  -  = Convert.ToInt16（_interval * Math.Cos（radians））; 
 _middle.Y  -  = Convert.ToInt16（_interval * Math.Sin（radians））; 
 
 pictureBox1.Location = _middle; 
} 
 
  private   void  Form1_Load（ object  sender，EventArgs e）
 {
 _start = pictureBox1.Location; 
 _end =  new 点（ 50 ， 50 ）; 
 _middle = _start; 
 
 radians =（Angle（_start，_end） -   180 ）* -1; 
 
 timer1.Enabled =  true ; 
} 
 
  const   double  Rad2Deg =  180 。 0  / Math.PI; 
 
  private   double  Angle（Point start，Point end）
 {
  return  Math.Atan2（start.Y  -  end.Y，end.X  -  start.X）* Rad2Deg; 
} < /   pre  >  

解决方案

你应该以正确的方式计算距离/角度：

  private   void  timer1_Tick（ object  sender，EventArgs e）
 {
 _middle.X  -  = Convert.ToInt16（_interval * Math.Cos（radians / Rad2Deg））; 
 _middle.Y  -  = Convert.ToInt16（_interval * Math.Sin（radians / Rad2Deg））; 
 
 pictureBox1.Location = _middle; 
} 
 

Cos，Sin等正在使用弧度而不是度数...

Hi I want to move a picturebox along a line with timer. I have 2 point as start point and end point. The below code moves the picturebox but dont move along my line:

What I have tried:

<pre lang="C#">Point _start;
        Point _end;
        int _interval = 7;
        Point _middle;
        double radians;
        private void timer1_Tick(object sender, EventArgs e)
        {
            _middle.X -= Convert.ToInt16(_interval * Math.Cos(radians));
            _middle.Y -= Convert.ToInt16(_interval * Math.Sin(radians));

            pictureBox1.Location = _middle;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            _start = pictureBox1.Location;
            _end = new Point(50, 50);
            _middle = _start;

            radians = (Angle(_start, _end) - 180) * -1;

            timer1.Enabled = true;
        }

        const double Rad2Deg = 180.0 / Math.PI;

        private double Angle(Point start, Point end)
        {
            return Math.Atan2(start.Y - end.Y, end.X - start.X) * Rad2Deg;
        }</pre>

解决方案

you should calculate the distances/angles in the right way :

private void timer1_Tick(object sender, EventArgs e)
 {
      _middle.X -= Convert.ToInt16(_interval * Math.Cos(radians / Rad2Deg));
    _middle.Y -= Convert.ToInt16(_interval * Math.Sin(radians / Rad2Deg));

    pictureBox1.Location = _middle;
  }

Cos, Sin and so on are working with radians and not with degrees ...

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