Solved

reduce movement speed of moving picturebox

Posted on 2011-09-20
3
237 Views
Last Modified: 2012-05-12
So I'm actually stuck at how to reduce movement speed (of my minigolf game)
To recap, I have a small picturebox and a timer set to 20ms.

So on mouseUp I have following code:
xVel = (e.X - gameBall.Location.X) * speed
            yVel = (e.Y - gameBall.Location.Y) * speed
            gameTimer.Enabled = True

Open in new window


Now, in my timerTick I have the code to check for wall collision and this:
If speed > 0 Then
            speed -= 0.01
        Else
            gameTimer.Enabled = False
        End If

Open in new window


Now that I think about it, the xVel and yVel are already multiplied by the speed (usually around 0,07). This might seem like a simple answer to you, but my brains wont function anymore :D
0
Comment
Question by:Mutsop
  • 2
3 Comments
 
LVL 8

Expert Comment

by:gena17
ID: 36567385
I believe you want to reduce movement speed so that each gets 0 at the end.
That means you first need to calculate the distance that your picture box will travel.
I think the speed change should NOT be linear, but a some function speed=f(distance). And perhaps the function should be logarithmic, since it gives the best view of reducing speed, IMO.
Something like ln(D-d), where D is the total distance, and d is the current distance traveled.
0
 
LVL 3

Author Comment

by:Mutsop
ID: 36567452
How to get your total distance if you just have the speed?
Speed is actually calculated like so

Private Sub strengthTimer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles strengthTimer.Tick
        If strengthBar.Value = 100 Then
            strengthBar.Value = 0
        End If
        strengthBar.PerformStep()
    End Sub

Private Sub Main_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
        strengthTimer.Enabled = False
        'Speed value
        speed = strengthBar.Value / 500
        If e.Button = Windows.Forms.MouseButtons.Left Then
            ControlPaint.DrawReversibleLine(ptStart, ptEnd, Color.Black)
            Cursor.Clip = Nothing
            xVel = (e.X - gameBall.Location.X) * speed
            yVel = (e.Y - gameBall.Location.Y) * speed
            gameTimer.Enabled = True
        End If
    End Sub

Open in new window


The strengthTimer_Tick is activated upon pressing down the left mouse button.
0
 
LVL 8

Accepted Solution

by:
gena17 earned 500 total points
ID: 36580301
The total distance should be calculated in advance at the moment when user clicks on Desired Location.
The total distance is the distance between Desired Location and Current Location. It is calculated only once and has nothing to do with speed.

Speed is calculated dynamically on every tick of the timer, based on Total Distance and Current Distance.
0

Featured Post

Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

Join & Write a Comment

Suggested Solutions

In my previous two articles we discussed Binary Serialization (http://www.experts-exchange.com/A_4362.html) and XML Serialization (http://www.experts-exchange.com/A_4425.html). In this article we will try to know more about SOAP (Simple Object Acces…
Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…
It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now