Drawing a Image bigger then the screen

[Georg]

Hi

I want to draw an Image bigger then the screen and have then scrollbars. I didn't found anything in the Treads. Someone can Help?

Georg

[Erel]

This code moves a large image by dragging the mouse (the file is also attached):

Sub Globals
    Dim x1,y1
    Dim maxX,maxY
End Sub

Sub App_Start
    Form1.Show
    drawer.New1("form1",false)
    bmpMap.New1("pic.jpg") 'Loads the image to a Bitmap object
    rectDest.New1(5,5,form1.Width-10,form1.Height-10) 'The form's rectangle
    rectSrc.New1(0,0,rectDest.Width,rectDest.Height) 'The bitmap's rectangle
    maxX = bmpMap.Width - rectDest.Width
    maxY = bmpMap.Height - rectDest.Height
    DrawMap
End Sub

Sub Form1_MouseDown (x,y)
    x1 = x
    y1 = y
End Sub

Sub Form1_MouseUp (x,y)
    RectSrc.X = Min(maxX,Max(RectSrc.X - x + x1,0)) 'Checks the bounds and updates the coordinates
    RectSrc.Y = Min(maxY,Max(RectSrc.Y - y + y1,0))
    DrawMap
End Sub

Sub DrawMap
    drawer.DrawImage1(bmpMap.Value,rectSrc.Value,rectDest.Value,false)
    drawer.Refresh2(rectDest.Value)
End Sub

[agraham]

This puts a big image on a smaller panel and uses the Door library to activate the Panel scroll bars.

[klaus]

You can also have a look at this.

Display maps

Best regards

[klaus]

Hi Andrew,

I had a look at your example. In this case are the LargeChange, SmallChange and Value parameters also accessible and be changed ?

The landing of the F111 is somewhat risky, isn't it ?

Thanks in advance

[agraham]

Originally Posted by klaus

I had a look at your example. In this case are the LargeChange, SmallChange and Value parameters also accessible and be changed ?

Yes, they should be accessible through the HorizontalScroll and VerticalScroll properties of the Panel which are HScrollProperties and VScrollProperties types respectively. If you walk the Docs for Panel you should see them and their members.

pnl1obj.FromControl("Panel1")
pnl1obj.SetProperty("AutoScroll", true)
hscrollobj.value = pnl1obj.GetProperty("HorizontalScroll") ' returns an HScrollProperties type
hscrollobj.SetProperty("LargeChange", 20)

The landing of the F111 is somewhat risky, isn't it ?

It's an Autralian one that sustained undercarriage damage on takeoff. They nearly dumped it in the sea but opted to belly it in after lightening it as much as possible. Surprisingly little damage was caused apparently!

[klaus]

Thanks Andrew,
I will use this in my Map display program

Best regards.

[klaus]

Hi Andrew,

Following my previous question, is it possible to add the ValueChanged event to the panel's scrollbars and of course how?
I did not succeed yet.

Thank you in advance and Best regards.

[agraham]

Originally Posted by klaus

is it possible to add the ValueChanged event to the panel's scrollbars

Unfortunately it looks like no .

The Door library can see two scroll bar property objects but not the scroll bars themselves. This is because the Panel is a native control, and so are its' scroll bars and the scroll bars are not exposed as .NET controls - only the Panel itself is. There is a Scroll event for the panel for the desktop but not on the device. However even on the desktop this event can't be used as the Door library doesn't know about the ScrollEventHandler object which this event returns.

[agraham]

Originally Posted by agraham

Unfortunately it looks like no

Actually

Using the dzEventsMagic library


EDIT : Note that if you want to try this on the device that Line 14 should be changed to "MouseDown", as a Panel does not have a MouseClick event on the device, and lines 19,20 and 21 removed as on the device a Panel does not have HorizontalScroll and VerticalScroll properties. The scroll events will work.