Move a picturebox along a line

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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:

C#

<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>

Posted 13-Nov-16 20:51pm

maysamfth

Updated 14-Nov-16 0:19am

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Ralf Meier 14-Nov-16 3:44am

And how does it move ?
And how should it move ?
You should be more specific ...

maysamfth 14-Nov-16 4:13am

I said that I want move a picturebox along a straight line but my code move the picturebox along another line. suppose a picturebox initial location is (200,200) then I want move this picturebox to point (50, 50). if you test my code the problem is specify.

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Ralf Meier · Accepted Answer · 2016-11-14T00:19:00

Solution 1

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

C#

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 ...

Posted 14-Nov-16 0:19am

Ralf Meier

Comments

maysamfth 14-Nov-16 7:11am

thanks.

Ralf Meier 14-Nov-16 8:12am

you are welcome ... :)