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Pixel Color and MDI workspace color

Posted on 2000-03-13
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Last Modified: 2010-05-02
How can I get the color of the bottom most right most pixel of an mdi forms picture (i.e. MDIform1.picture) and set the back ground property of the mdi form to that color.

I don't want to use any extra picture box controls if i dont have to.
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Question by:hess
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6 Comments
 
LVL 1

Expert Comment

by:fbtcell
ID: 2611509
May be you can try GetPixel API function to have the color of the pixel :
color = GetPixel(MDIform1.picture.hdc, x, y)
where x and y stand for the right (and top or left) most coordinates.

And then set the back ground property of the mdi form :
MDIform1.BackColor = color

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LVL 3

Expert Comment

by:paulstamp
ID: 2612739
fbtCell - one problem with that answer : there is no hdc property of an MDI form's picture.
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LVL 1

Expert Comment

by:fbtcell
ID: 2612972
I tried on an MDI form.
Make sure that MDIform1.HasDC = True and then call :
color = GetPixel(MDIform1.hDC, x, y)

(i just belived that MDIform1.picture was a PictureBox, and PictureBox used to have one hdc).
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LVL 32

Accepted Solution

by:
Erick37 earned 50 total points
ID: 2614170
Here is a way that does not require an hDC property of the MDI main form:

'~~~~MDI MAIN FORM CODE~~~~
Option Explicit

Private Sub MDIForm_Load()
    Show
    Me.BackColor = GetLRPicPel(Me.Picture)
End Sub



'~~~~(BAS) MODULE CODE~~~~
Option Explicit
Public Const MM_HIMETRIC = 3
Public Const MM_TEXT = 1
Type POINTAPI
    x As Long
    y As Long
End Type
Declare Function LPtoDP Lib "gdi32" _
    (ByVal hdc As Long, lpPoint As POINTAPI, ByVal nCount As Long) As Long
Declare Function SetMapMode Lib "gdi32" _
    (ByVal hdc As Long, ByVal nMapMode As Long) As Long
Declare Function CreateCompatibleDC Lib "gdi32" _
    (ByVal hdc As Long) As Long
Declare Function SelectObject Lib "gdi32" _
    (ByVal hdc As Long, ByVal hObject As Long) As Long
Declare Function GetPixel Lib "gdi32" _
    (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long
Declare Function DeleteDC Lib "gdi32" _
    (ByVal hdc As Long) As Long

Public Function GetLRPicPel(pic As StdPicture) As OLE_COLOR
    Dim lcDC As Long
    Dim lColor As Long
    Dim lRet As Long
    Dim pt As POINTAPI
    On Error GoTo PICERR
    If (pic.Handle = 0) Then Err.Raise 1050, , "Invalid Picture"
    pt.x = pic.Width
    pt.y = pic.Height
    lcDC = CreateCompatibleDC(0)
    lRet = SetMapMode(lcDC, MM_HIMETRIC)
    lRet = SelectObject(lcDC, pic.Handle)
    lRet = LPtoDP(lcDC, pt, 1)
    lRet = SetMapMode(lcDC, MM_TEXT)
    lColor = GetPixel(lcDC, pt.x - 1, (-pt.y) - 1)
    If (lColor = -1) Then Err.Raise 1050, , "Invalid Color from GetPixel"
    GetLRPicPel = lColor
    lRet = DeleteDC(lcDC)
    Exit Function
PICERR:
    If (lcDC <> 0) Then Call DeleteDC(lcDC)
    GetLRPicPel = vbApplicationWorkspace
    MsgBox Err.Description, , "GetLRPicPel"
End Function
 
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Author Comment

by:hess
ID: 2632224
Sorry, Eric37 Has the answer i'm looking for.
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Author Comment

by:hess
ID: 2632226
This was great and did exactly what i needed
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