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mBlendColorAlpha.bas
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BASIC Source File
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2009-01-12
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1KB
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46 lines
Attribute VB_Name = "mBlendColorAlpha"
Option Explicit
Private Declare Function OleTranslateColor Lib "OLEPRO32.DLL" (ByVal OLE_COLOR As Long, ByVal HPALETTE As Long, pccolorref As Long) As Long
Public Property Get BlendColor( _
ByVal oColorFrom As OLE_COLOR, _
ByVal oColorTo As OLE_COLOR, _
Optional ByVal alpha As Long = 128 _
) As Long
Dim lCFrom As Long
Dim lCTo As Long
lCFrom = TranslateColor(oColorFrom)
lCTo = TranslateColor(oColorTo)
Dim lSrcR As Long
Dim lSrcG As Long
Dim lSrcB As Long
Dim lDstR As Long
Dim lDstG As Long
Dim lDstB As Long
lSrcR = lCFrom And &HFF
lSrcG = (lCFrom And &HFF00&) \ &H100&
lSrcB = (lCFrom And &HFF0000) \ &H10000
lDstR = lCTo And &HFF
lDstG = (lCTo And &HFF00&) \ &H100&
lDstB = (lCTo And &HFF0000) \ &H10000
BlendColor = RGB( _
((lSrcR * alpha) / 255) + ((lDstR * (255 - alpha)) / 255), _
((lSrcG * alpha) / 255) + ((lDstG * (255 - alpha)) / 255), _
((lSrcB * alpha) / 255) + ((lDstB * (255 - alpha)) / 255) _
)
End Property
Private Function TranslateColor(ByVal clr As OLE_COLOR, _
Optional hPal As Long = 0) As Long
If OleTranslateColor(clr, hPal, TranslateColor) Then
TranslateColor = -1
End If
End Function