Mini-Map Type Effect

[S-10 Man]

Is there a way to have a very large picture behind a picture box and be able to move the picture box around the large picture showing different views?? Thanks a lot.

[Cakkie]

The picturebox control has a PaintPicture method. This allows you to specify the location of where it needs to start drawing.

' This would look like the view has moved right
Picture1.PaintPicture LoadPicture("somepic.bmp"), -100, 0

' This would look like the view has moved left
Picture1.PaintPicture LoadPicture("somepic.bmp"), 100, 0

' This would look like the view has moved down
Picture1.PaintPicture LoadPicture("somepic.bmp"), 0, -100

' This would look like the view has moved up
Picture1.PaintPicture LoadPicture("somepic.bmp"), 0, 100




Tom Cannaerts
[email protected]

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the universe trying to produce bigger and better idiots. So far, the universe is winning -- Rich Cook

[shree]

I have given below the form code of a project from which you can start with. Copy this code and paste onto either WordPad or Word and save it as a text file. Give it the name frmScroll.frm

Now start VB by double clicking on frmScroll.frm. You will get one error while loading. Click on Yes.

Set the picture property of picture3 to a large image.

Now click on the CheckBox. When it is checked, the image will fit, when not, you can scroll through the image.

When working with graphics, make sure that the picture boxes have AutoRedraw set to true and ScaleMode is set to Pixel.

To make the program respond faster, you can use StretchBlt. I used PaintPicture for a quick solution.



VERSION 5.00
Begin VB.Form Form1
Caption = "Form1"
ClientHeight = 9030
ClientLeft = 60
ClientTop = 345
ClientWidth = 9540
LinkTopic = "Form1"
ScaleHeight = 602
ScaleMode = 3 'Pixel
ScaleWidth = 636
StartUpPosition = 3 'Windows Default
Begin VB.CheckBox Check1
Caption = "Fit"
Height = 375
Left = 8040
TabIndex = 5
Top = 840
Width = 1095
End
Begin VB.VScrollBar VScroll1
Height = 7815
Left = 7560
TabIndex = 4
Top = 120
Width = 255
End
Begin VB.HScrollBar HScroll1
Height = 255
Left = 360
TabIndex = 3
Top = 7920
Width = 7215
End
Begin VB.PictureBox Picture3
Appearance = 0 'Flat
AutoRedraw = -1 'true
AutoSize = -1 'true
BackColor = &H80000005&
BorderStyle = 0 'None
ForeColor = &H80000008&
Height = 9465
Left = 8160
Picture = "Form1.frx":0000
ScaleHeight = 631
ScaleMode = 3 'Pixel
ScaleWidth = 926
TabIndex = 2
Top = 5520
Visible = 0 'false
Width = 13890
End
Begin VB.PictureBox Picture1
Appearance = 0 'Flat
AutoRedraw = -1 'true
BackColor = &H80000005&
BorderStyle = 0 'None
ForeColor = &H80000008&
Height = 7815
Left = 360
ScaleHeight = 521
ScaleMode = 3 'Pixel
ScaleWidth = 481
TabIndex = 0
Top = 120
Width = 7215
Begin VB.PictureBox Picture2
Appearance = 0 'Flat
AutoRedraw = -1 'true
AutoSize = -1 'true
BackColor = &H80000005&
BorderStyle = 0 'None
ForeColor = &H80000008&
Height = 7815
Left = 0
ScaleHeight = 521
ScaleMode = 3 'Pixel
ScaleWidth = 481
TabIndex = 1
Top = 0
Width = 7215
End
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = false
Attribute VB_Creatable = false
Attribute VB_PredeclaredId = true
Attribute VB_Exposed = false
private Sub ScrollPicBox(picSource as PictureBox, picContain as PictureBox, picTemp as PictureBox, Fit as Integer, HScroll1 as HScrollBar, VScroll1 as VScrollBar)
Dim Hgt as Integer, Wdth as Integer, CopyMode as Long
Dim TopCorner as Integer, LeftCorner as Integer
Dim SC as Integer, LC as Integer
Dim X as Long
CopyMode = &HCC0020

If Fit = 0 then
picSource.Picture = picTemp.Image
else
Hgt = picTemp.Height
Wdth = picTemp.Width
If Hgt > picContain.Height And Wdth > picContain.Width then
If Hgt / picContain.Height > Wdth / picContain.Width then
Wdth = Wdth * picContain.Height / Hgt
Hgt = picContain.Height
else
Hgt = Hgt * picContain.Width / Wdth
Wdth = picContain.Width
End If
else
If Hgt > picContain.Height then
Wdth = Wdth * picContain.Height / Hgt
Hgt = picContain.Height
else
If Wdth > picContain.Width then
Hgt = Hgt * picContain.Width / Wdth
Wdth = picContain.Width
End If
End If
End If

picSource.Height = Hgt
picSource.Width = Wdth
picSource.PaintPicture picTemp.Image, 0, 0, Wdth, Hgt, 0, 0, picTemp.Width, picTemp.Height, CopyMode
End If

TopCorner = (picContain.Height - picSource.Height) / 2
If TopCorner < 0 then TopCorner = 0
picSource.Top = TopCorner

LeftCorner = (picContain.Width - picSource.Width) / 2
If LeftCorner < 0 then LeftCorner = 0
picSource.Left = LeftCorner

If picSource.Width > picContain.Width then
HScroll1.Visible = true
HScroll1.Max = picSource.Width - picContain.Width
SC = HScroll1.Max * 0.01
If SC < 1 then SC = 1
HScroll1.SmallChange = SC
LC = HScroll1.Max * 0.1
If LC < 1 then LC = 1
HScroll1.LargeChange = LC

else
HScroll1.Visible = false
End If

If picSource.Height > picContain.Height then
VScroll1.Visible = true
VScroll1.Max = picSource.Height - picContain.Height
SC = VScroll1.Max * 0.01
If SC < 1 then SC = 1
VScroll1.SmallChange = SC
LC = VScroll1.Max * 0.1
If LC < 1 then LC = 1
VScroll1.LargeChange = LC
else
VScroll1.Visible = false
End If
End Sub

private Sub Check1_Click()
ScrollPicBox Picture2, Picture1, Picture3, Check1.Value, HScroll1, VScroll1
End Sub

private Sub VScroll1_Change()
Picture2.Top = -VScroll1.Value
End Sub

private Sub HScroll1_Change()
Picture2.Left = -HScroll1.Value
End Sub