by Jon Mooty AKA YoungBuck (5 Submissions)
Category: Graphics
Compatability: Visual Basic 5.0
Difficulty: Unknown Difficulty
Originally Published: Sat 13th January 2001
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Algorithm to fade an object from one color to another. Any type of control that has a BackColor property can be used.
VBcoders
'*****************
'*****************
'~~~~~~~~~~~~~~~~~
' IN A .BAS MODULE
'~~~~~~~~~~~~~~~~~
'*****************
'*****************
Option Explicit
Private Type RGBColor
R As Long
G As Long
B As Long
End Type
Public Sub FadeForm(pCtl As Object, pStartCol As Long, pEndCol As Long, pLoopCt As Long)
Dim rgbS As RGBColor
Dim rgbE As RGBColor
Dim iRChg As Single, iGChg As Single, iBChg As Single
Dim lCurColor As Long
Dim iCt As Integer
' Retrieve the individual red, green, and blue values for the start color
rgbS = IndColors(pStartCol)
' Retrieve the individual red, green, and blue values for the start color
rgbE = IndColors(pEndCol)
' Get the amount to change the colors during the loop
iRChg = (rgbE.R - rgbS.R) / pLoopCt
iGChg = (rgbE.G - rgbS.G) / pLoopCt
iBChg = (rgbE.B - rgbS.B) / pLoopCt
For iCt = 1 To pLoopCt
'get the value of the current color
lCurColor = RGB(rgbS.R + iRChg * iCt, rgbS.G + iGChg * iCt, rgbS.B + iBChg * iCt)
'display the current color of the form
pCtl.BackColor = lCurColor
'allow other processes to execute
DoEvents
Next iCt
End Sub
Private Function IndColors(pCol As Long) As RGBColor
With IndColors
.B = pCol \ 65536
.G = (pCol - .B * 65536) \ 256
.R = pCol - .B * 65536 - .G * 256
End With
End Function
'************
'**********
'~~~~~~~~~~
' IN A FORM
'~~~~~~~~~~
'**********
'**********
Private Sub Form_Load()
Me.Show
' Fade a form from Blue to Green, run the coloring loop 10000 times
' To change the speed of the fading, then just simply adjust the pLoopCt parameter _
the lower the number the faster the fading effect will occur
FadeForm Me, vbBlue, vbGreen, 10000
End Sub
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