FOR...NEXT LOOP in VB 2005

[mygirl22]

1.I have created a moving object (which is a button) in a form (rectangle box) called "Enjoy Button" and it moves when
2. a specific button named "Start Timer" is pressed...When the "Start Timer" button is pressed, the
3. "xTimer" event is called and the button moves in a rectangle box and bounces of the walls...=animation

4. However, i need to write a For..Next Loop in the
5."For Next " Button= a button named for next
6.and also put a counter in the loop to control the animation time..
7.The loop should stop at a certain time, and the object too should stop at that time,at a new location


this is what i have so far

Private Sub ForNextButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles xForNextButton.Click, xTimer.Tick
        Dim MyTime As Integer = 5
        Counter = 1000
 
        For Counter = 0 To 1000
            xTimer.Enabled = MyTime * 1
            ' Move the button for a set amount of time
            ' Exit the loop
 
        Next
 

[tlhintoq]

My compliments on how well you have described what your goals are and your intended plan of action to get there. Not everyone does that as well.
But... What is your question for the volunteers here?

By the way... Line 6 is probably going to give you problems. .Enabled is generally a boolean (true/false) but you are repeatedly setting it equal to 5*1.

[mygirl22]

Question
How do i write a for next loop structure that has a counter that controls the time?
If that makes sense

[tlhintoq]

Ah... To control time... Wouldn't that just be wonderful? I would never have to worry about a deadline again. <laugh>

First lets decide which of the two things you're talking about is the important one: Do you want this to work based on a counter; where the animation will take place for a set number of times (number of moves)... or do you want the animation to take place for a given amount of elapsed time (30 seconds)?

[mygirl22]

you are too funny..lol

I want the counter to control the animation time..when the button named " For Next..."is clicked.....say maybe 30 seconds, then the loop should stop without clicking the "For..NExt Button again".......

[tlhintoq]

What I'm getting at is that a counter is not necessarily where you are going with this. A loop yes, but it doesn't have to be a loop based on counting.

It sounds like you want a loop based on time: The loop continues until the time runs out.

I can give you a sample in C#. It shouldn't be too rough to follow the logic and translate to VB

            DateTime TimeOut = DateTime.Now.AddSeconds(30);// Use a variable for the 30 so as to make it more dynamic
            while (DateTime.Now <= TimeOut)
            {
                // Move the button one step
                Application.DoEvents(); // so the application isn't hung up
            }
            // This is what happens with the time is expired
 

[mygirl22]

thanks..i'll try and translate, thought i don't think i get it....

[tlhintoq]

The idea is you needed a 'loop' but not necessarily a 'counter', if I understood the goal.

That's exactly what a 'while' loop is. As long as the conditions within the ( ) are true, the body { } will keep looping.

So we set a DateTime object to the current time, plus however long we want to keep going: Our TimeOut/ At 12:30:10 the timeout becomes 12:30:40 in this example.

As the loop runs it keeps comparing the the current time to the timeout time.
First run through loop 12:30:11 is less than or equal to 12:30:40 so the loop runs... at 12:30:12 it is still true; at 12:30:39 its true;... at :12:30:41 the test condition is no longer true, so the While loop ends.

[mygirl22]

DO i have this right?

 
    * Dim TimeOut As DateTime = DateTime.Now.AddSeconds(30)
    * ' Use a variable for the 30 so as to make it more dynamic
    * While DateTime.Now <= TimeOut
    *     ' Move the button one step
    *     Application.DoEvents()
    *     ' so the application isn't hung up
    * End While
    * ' This is what happens with the time is expired
    * If True Then
    *     Dim i As Integer = 0, j As Integer = 1
    *     While test(i, j)
    *         printf("for loop i=%d" & vbLf, i)
    *         increment(i, j)
    *     End While
    *     printf("Finished" & vbLf)
    * End If
 
 

[tlhintoq]

I can't completely vouch for the translation as am I a C# guy and just read VB for the "gist of it", but that looks about right.

I don't completely follow the part you have after the loop is done moving the button around

  * ' This is what happens with the time is expired
    * If True Then
    *     Dim i As Integer = 0, j As Integer = 1
    *     While test(i, j)
    *         printf("for loop i=%d" & vbLf, i)
    *         increment(i, j)
    *     End While
    *     printf("Finished" & vbLf)
    * End If

if True ... No comparison taking place here so it will always be true

I don't know what your test(int i, int j) method does, so I have no idea under what conditions it will return true or false. Therefore its hard to say if this loop will ever execute.

[mygirl22]

Oky, i finally got the directions right...

Hi,
I wanted to know how to create a "for...next loop" to up date an animated ball location? the ball moves in a form and bounces off four walls...the "for...next loop" will be activated when the "for..next button" is clicked...then the ball will move to another location.....it has nothing to do with time...

[mygirl22]

@mygirl22
this is what i have so far but the problem is that the button (animation) is not moving five times before it stop and it is moving too fast..any ideas anyone?

   Private Sub ForNextButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles xForNextButton.Click, xTimer.Tick
        'Me.xTimer.Enabled = False
        'Me.xTimeStartButton.Click.enabled = False
 
        For i As Integer = 0 To 2
 
        xEnjoyButton.Location = New Point(i,i)
 
        'Threading.Thread.Sleep(2)
 
        Next 'i
 
 
 
        xButtonLabel.Text = "Button(" & xEnjoyButton.Location.X.ToString & "," & xEnjoyButton.Location.Y.ToString & ")"
 
 
    End Sub

[MrMancunian]

Threading.Thread.Sleep(2)
 

This means that it will sleep 2 miliseconds every loop. 1000 miliseconds is 1 second, so you should change the sleepvalue if you want something to move at an acceptable speed.

Steven

[tlhintoq]

Also going from location (0,0) to (1,1) to (2,2) may not look like movement.
It may of moved diagonally 2 pixels but that's such a small movement that its hard to detect.

I suggest putting in the Application.DoEvents() from the earlier posts so you give the form some processor time to update the display. Often these types of things will do as they are told, the button will move, but the form doesn't have a chance to OnPaint() the updates.

[mygirl22]

Thanks i figured it out..i create another private sub called animation in my program and i figured how to do the loops

[tlhintoq]

Hurray! That's what we love here: people learning and figuring things out.