Bloody Scrollbars!

I'm trying to scroll a bitmap in a picture box using 2 scrollbars like you'd expect.

But the code only works if I set the Largechange property of the scrollbars to 0. If I use a number greater than 0 then the bitmap appears in the wrong place.

I can't see how LargeChange should make any difference.

What is the normal method for showing a bitmap in a picturebox using scrollbars?

Code would be great, please.

Hi.

Try looking at this post...

http://www.vbforums.com/showthread.php?threadid=278843

That'll do nicely, thanks.

lol it's really weird how someone else asked the same question again in a short time:D

btw pax, I was getting some weird errors. One thing that was really really weird was that at certain times (I think when I scrolled really fast repeatedly? cant remember what I did)... scrollbar.value would have a value greater than scrollbar.maximum (whitout raising any errors) and so I had to check the Value property outside of the scrollbar class to make sure its on the right range...
also in another situation ( I dont remember again when this would happen)... when I would change the value of Maximum it wouldnt change anything. It was weird because after calling the function 3 times it would then work fine. I just took a backup of LargeChange before changing the maximum and it fixed it:

VB Code:

Public Shadows Property Maximum() As Integer
        Get
            ' Return the real maximum
            Return MyBase.Maximum - Me.LargeChange + 1
        End Get
        Set(ByVal Value As Integer)
            ' Calculate the 'virtual' maximum
            Dim tmp As Integer = MyBase.LargeChange
            MyBase.Maximum = Value + Me.LargeChange - 1
            MyBase.LargeChange = tmp
        End Set
    End Property

anyways wossname why are you using a scrollbar for scrolling an image? you can just use a panel, put the picturebox in it, and set the AutoScroll property of the panel to true. It would do everything for you nicely. I had to use these scrollbars because I'm drawing my image manually, dunno about you

Quote:

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Originally posted by MrPolite
anyways wossname why are you using a scrollbar for scrolling an image? you can just use a panel, put the picturebox in it, and set the AutoScroll property of the panel to true. It would do everything for you nicely. I had to use these scrollbars because I'm drawing my image manually, dunno about you

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Now you bloody tell me. This .net crap is like learning programming all over again. :)

In my day we had VB6. I could have written this damn program in 3 hours and had done with it. I'll try the panel version.

:(

Thanks for the tip though :thumb:

I've tried that, but the scrollbars on the panel don't appear when the image loads.

Autosize and autoscroll on the respective controls are set true but nothing happens when a large picture is shown. I'm setting the Image property of the picturebox to a bitmap loaded using

Code:

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PicMaster.Image = new Bitmap(Bitmap.FromFile(MyFileName))

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What (else) am I doing wrong? :D

Never mind, I've got it working.

I must say though, the scrolling was much smoother when I was drawing the image manually with Graphics.DrawImage().

I might go back to that.

Quote:

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Originally posted by wossname
Never mind, I've got it working.

I must say though, the scrolling was much smoother when I was drawing the image manually with Graphics.DrawImage().

I might go back to that.

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hehe why was it smoother?
care to post your code so I see what you're doing?:rolleyes: