C# panel move with collision

Question

I am new to C# and Winforms and try to make a moving panel. It should move right until the end of my window and then back left. It should bounce from side to side. But the only

Answer 1

Here is the code I used:

int d= 10;
private void timer1_Tick(object sender, EventArgs e)
{
    //Reverse the direction of move after a collision
    if(panel1.Left==0 || panel1.Right==this.ClientRectangle.Width)
        d = -d;

    //Move panel, also prevent it from going beyond the borders event a point.
    if(d>0)
        panel1.Left = Math.Min(panel1.Left + d, this.ClientRectangle.Width - panel1.Width);
    else
        panel1.Left = Math.Max(panel1.Left + d, 0);
}

Note:

To check the collision you should check:

• Collision with left: panel1.Left==0
• Collision with right: panel1.Right==this.ClientRectangle.Width

You should not allow the panel goes beyond the borders even a point, so:

• The maximum allowed value for your panel left is this.ClientRectangle.Width - panel1.Width

• The minimum allowed value for your panel left is 0

Also It's better to use this.ClientRectangle.Width instead of using hard coded 316.

Answer 2

Depending on what you're using:

1. Windows Forms
2. WPF

Create a Timer and subscribe to the Tick event. Also, you should create new int property Step.

1. Windows Forms:

System.Windows.Forms.Timer t = new System.Windows.Forms.Timer();
int Step;

Form1 () 
{
     InitializeComponent()
    ....
     t.Interval = 15000; // specify interval time as you want
     t.Tick += new EventHandler(timer_Tick); 
     t.Start();

     this.Step = 2; 
}

And in ticks event handler put your logic, without while

void timer_Tick(object sender, EventArgs e)
{
        if (pnlBox.Location.X >= 316)
        {
            Step = -2;
        }
        if (pnlBox.Location.X <= 0) 
        {
            Step = 2;
        }

        pnlBox.Location = new Point(
        pnlBox.Location.X + Step , pnlBox.Location.Y);
        string BoxLocationString = pnlBox.Location.ToString();
        lblXY.Text = BoxLocationString;
}

So your box will move on one step per one timer tick.

1. WPF:

As System.Windows.Forms.Timer is not available, you may use System.Windows.Threading.DispatcherTimer:

using System.Windows.Threading;

DispatcherTimer t = new DispatcherTimer();
t.Interval = new TimeSpan(0, 0, 15); // hours, minutes, seconds (there are more constructors)
t.Tick += Timer_Tick;
t.Start();