Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Picture Box Problem

Posted on 2006-11-21
2
330 Views
Last Modified: 2012-05-05
Hi All,

I want to create a small app that displays GPS position according NMEA GPS input.  The input side I'm ok with.  However mapping is a problem.  I have so far...

one picturebox which i load with a bitmap map.  I set scalemode to 0 and scale properties according to known lat long.  whne i move my cursor over the map and show xy correct lon,lat is shown fine.

Next i want to be able to zoom and pan the image.  So i select an area proportional to the picturebox size (1/8) according to where the user clicks on the image. Then i use the paintpicture method to copy this to another picturebox where it is displayed as expected.

Now the problem area.  When the area is displayed in the second pic box(the pic box the user will see) i need to keep the scaleheight width etc according to where the selection area fits on pic box 1.  When I do this I just get a copy of the original image in pic 2??

I have tried copying the cropped image to an imagebox and scaling this accordingly but with no joy?

I need to keep a master image in picturebox 1 as this will be constantly be updated with new points showing current position.  The user must work in another window that will zoom and pan around this master image.

Any help suggestions greatly appreciated.

Thanks in advance,

J

Code as follows:


Dim mouse_xup As Double
Dim mouse_yup As Double
Dim mouse_xdown  As Double
Dim mouse_ydown  As Double
Dim zoomwidth As Double
Dim zoomheight As Double


Private Sub Form_Load()

    Dim zoompic As SuperPicCtl

    Picture2.ScaleMode = 0
    Picture1.ScaleMode = 0
    Picture1.Picture = LoadPicture("C:\TEMP\drive1.bmp")
    Picture1.Picture = Picture1.Image
 
    Picture2.Width = Picture1.Width
    Picture2.Height = Picture1.Height
   
    Picture1.ScaleHeight = -Picture1.Height 'latdegreedelta
    Picture1.ScaleWidth = Picture1.Width 'londegreedelta

    Picture1.ScaleLeft = 0 'minlon
    Picture1.ScaleTop = Picture1.Height 'max lat
   
    Picture2.ScaleHeight = -Picture1.Height 'latdegreedelta
    Picture2.ScaleWidth = Picture1.Width 'londegreedelta

    Picture2.ScaleLeft = 0 'minlon
    Picture2.ScaleTop = Picture1.Height 'max lat

    zoomwidth = Abs(Picture1.ScaleWidth / 4)
    zoomheight = Abs(Picture1.ScaleHeight / 4)

End Sub


Private Sub Picture1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)

    If Toolbar1.Buttons(4).Value = 1 Then

    ElseIf Toolbar1.Buttons(2).Value = 1 Then
    'IF I UNCOMMENT THIS BLOCK I GET A COPY OF ORIG PIC, IF COMMENTED JUST THE CROP AREA IN BOT LEFT PIC2
'        Picture2.ScaleHeight = -zoomheight 'latdegreedelta
'        Picture2.ScaleWidth = zoomwidth 'londegreedelta
'        Picture2.ScaleLeft = X 'minlon
'        Picture2.ScaleTop = Y + zoomheight 'max lat
   
        mouse_xdown = X
        mouse_ydown = Y
               
        Call Picture2.PaintPicture(Picture1, X, Y, zoomwidth, zoomheight, X, Y, zoomwidth, zoomheight)

    End If
End Sub

0
Comment
Question by:JasonFirth
2 Comments
 
LVL 3

Accepted Solution

by:
Obadah_HighTech earned 250 total points
ID: 18009011
Hello,

if you want Picture2 to be a zoomed version of a clip from Picture1, you have to modify your call for PaintPicture.

your code:

Call Picture2.PaintPicture(Picture1, X, Y, zoomwidth, zoomheight, X, Y, zoomwidth, zoomheight)

the modified code:

Call Picture2.PaintPicture(Picture1, 0, 0, Picture2.Width, Picture2.Height, X, Y, zoomwidth, zoomheight)
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction While answering a recent question (http://www.experts-exchange.com/Q_27402310.html) in the VB classic zone, I wrote some VB code in the (Office) VBA environment, rather than fire up my older PC.  I didn't post completely correct code o…
Most everyone who has done any programming in VB6 knows that you can do something in code like Debug.Print MyVar and that when the program runs from the IDE, the value of MyVar will be displayed in the Immediate Window. Less well known is Debug.Asse…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

809 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