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ModFunctions.bas
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Attribute VB_Name = "ModFunctions"
Option Explicit
Function DECIMAL2RGB(ColorVal) As Variant
' Converts a color value to an RGB triplet
' Returns a 3-element variant array
DECIMAL2RGB = Array(ColorVal \ 256 ^ 0 And 255, ColorVal \ 256 ^ 1 And 255, ColorVal \ 256 ^ 2 And 255)
End Function
Function RGB2DECIMAL(R, G, B) As Long
RGB2DECIMAL = RGB(R, G, B)
End Function
Function HSL2RGB(H, S, L) As Variant
' Converts an HSL triplet (0-255) to an RGB triplet
' Returns a 3-element variant array
Dim temp1 As Double, temp2 As Double
Dim Rtemp3 As Double, Gtemp3 As Double, Btemp3 As Double
Dim R As Double, G As Double, B As Double
If S = 0 Then
HSL2RGB = Array(L, L, L)
Exit Function
End If
H = H / 255
S = S / 255
L = L / 255
If L < 0.5 Then
temp2 = L * (1 + S)
Else
temp2 = L + S - L * S
End If
temp1 = 2 * L - temp2
Rtemp3 = H + 1 / 3
If Rtemp3 < 0 Then Rtemp3 = Rtemp3 + 1
If Rtemp3 > 1 Then Rtemp3 = Rtemp3 - 1
Gtemp3 = H
If Gtemp3 < 0 Then Gtemp3 = Gtemp3 + 1
If Gtemp3 > 1 Then Gtemp3 = Gtemp3 - 1
Btemp3 = H - 1 / 3
If Btemp3 < 0 Then Btemp3 = Btemp3 + 1
If Btemp3 > 1 Then Btemp3 = Btemp3 - 1
'Red
If 6 * Rtemp3 < 1 Then
R = temp1 + (temp2 - temp1) * 6 * Rtemp3
Else
If 2 * Rtemp3 < 1 Then
R = temp2
Else
If 3 * Rtemp3 < 2 Then
R = temp1 + (temp2 - temp1) * ((2 / 3) - Rtemp3) * 6
Else
R = temp1
End If
End If
End If
'Green
If 6 * Gtemp3 < 1 Then
G = temp1 + (temp2 - temp1) * 6 * Gtemp3
Else
If 2 * Gtemp3 < 1 Then
G = temp2
Else
If 3 * Gtemp3 < 2 Then
G = temp1 + (temp2 - temp1) * ((2 / 3) - Gtemp3) * 6
Else
G = temp1
End If
End If
End If
'Blue
If 6 * Btemp3 < 1 Then
B = temp1 + (temp2 - temp1) * 6 * Btemp3
Else
If 2 * Btemp3 < 1 Then
B = temp2
Else
If 3 * Btemp3 < 2 Then
B = temp1 + (temp2 - temp1) * ((2 / 3) - Btemp3) * 6
Else
B = temp1
End If
End If
End If
HSL2RGB = Array(Int(R * 255), Int(G * 255), Int(B * 255))
End Function
Function RGB2HSL(R, G, B) As Variant
' Converts an RGB triplet to an HSL triplet(0-255)
' Returns a 3-element variant array
Dim sMax As Double, sMin As Double
Dim H As Double, S As Double, L As Double
R = R / 255
G = G / 255
B = B / 255
sMax = Application.Max(R, Application.Max(G, B))
sMin = Application.Min(R, Application.Min(G, B))
L = (sMax + sMin) / 2
If sMax = sMin Then
S = 0
H = 0
L = L * 255
RGB2HSL = Array(Round(H, 0), Round(S, 0), Round(L, 0))
Exit Function
End If
If L < 0.5 Then
S = (sMax - sMin) / (sMax + sMin)
Else
S = (sMax - sMin) / (2 - sMax - sMin)
End If
If S < 0 Then S = 0
If R = sMax Then H = (G - B) / (sMax - sMin)
If G = sMax Then H = 2 + (B - R) / (sMax - sMin)
If B = sMax Then H = 4 + (R - G) / (sMax - sMin)
H = H * 42.5
If H < 0 Then H = H + 255
S = S * 255
L = L * 255
RGB2HSL = Array(Round(H, 0), Round(S, 0), Round(L, 0))
End Function
Function DECIMAL2HSL(ColorVal) As Variant
' Converts a color value to HSL (0-255)
' Returns a 3-element variant array
Dim sMax As Double, sMin As Double
Dim R As Double, G As Double, B As Double
Dim H As Double, S As Double, L As Double
R = ColorVal \ 256 ^ 0 And 255
G = ColorVal \ 256 ^ 1 And 255
B = ColorVal \ 256 ^ 2 And 255
R = R / 255
G = G / 255
B = B / 255
sMax = Application.Max(R, Application.Max(G, B))
sMin = Application.Min(R, Application.Min(G, B))
L = (sMax + sMin) / 2
If sMax = sMin Then
S = 0
H = 0
L = L * 255
DECIMAL2HSL = Array(Round(H, 0), Round(S, 0), Round(L, 0))
Exit Function
End If
If L < 0.5 Then
S = (sMax - sMin) / (sMax + sMin)
Else
S = (sMax - sMin) / (2 - sMax - sMin)
End If
If S < 0 Then S = 0
If R = sMax Then H = (G - B) / (sMax - sMin)
If G = sMax Then H = 2 + (B - R) / (sMax - sMin)
If B = sMax Then H = 4 + (R - G) / (sMax - sMin)
H = H * 42.5
If H < 0 Then H = H + 255
S = S * 255
L = L * 255
DECIMAL2HSL = Array(Round(H, 0), Round(S, 0), Round(L, 0))
End Function
Function HSL2DECIMAL(H, S, L) As Long
' Converts an HSL triplet (0-255) to decimal color value
Dim temp1 As Double, temp2 As Double
Dim Rtemp3 As Double, Gtemp3 As Double, Btemp3 As Double
Dim R As Double, G As Double, B As Double
If S = 0 Then
HSL2DECIMAL = RGB(L, L, L)
Exit Function
End If
H = H / 255
S = S / 255
L = L / 255
If L < 0.5 Then
temp2 = L * (1 + S)
Else
temp2 = L + S - L * S
End If
temp1 = 2 * L - temp2
Rtemp3 = H + 1 / 3
If Rtemp3 < 0 Then Rtemp3 = Rtemp3 + 1
If Rtemp3 > 1 Then Rtemp3 = Rtemp3 - 1
Gtemp3 = H
If Gtemp3 < 0 Then Gtemp3 = Gtemp3 + 1
If Gtemp3 > 1 Then Gtemp3 = Gtemp3 - 1
Btemp3 = H - 1 / 3
If Btemp3 < 0 Then Btemp3 = Btemp3 + 1
If Btemp3 > 1 Then Btemp3 = Btemp3 - 1
'Red
If 6 * Rtemp3 < 1 Then
R = temp1 + (temp2 - temp1) * 6 * Rtemp3
Else
If 2 * Rtemp3 < 1 Then
R = temp2
Else
If 3 * Rtemp3 < 2 Then
R = temp1 + (temp2 - temp1) * ((2 / 3) - Rtemp3) * 6
Else
R = temp1
End If
End If
End If
'Green
If 6 * Gtemp3 < 1 Then
G = temp1 + (temp2 - temp1) * 6 * Gtemp3
Else
If 2 * Gtemp3 < 1 Then
G = temp2
Else
If 3 * Gtemp3 < 2 Then
G = temp1 + (temp2 - temp1) * ((2 / 3) - Gtemp3) * 6
Else
G = temp1
End If
End If
End If
'Blue
If 6 * Btemp3 < 1 Then
B = temp1 + (temp2 - temp1) * 6 * Btemp3
Else
If 2 * Btemp3 < 1 Then
B = temp2
Else
If 3 * Btemp3 < 2 Then
B = temp1 + (temp2 - temp1) * ((2 / 3) - Btemp3) * 6
Else
B = temp1
End If
End If
End If
HSL2DECIMAL = RGB(Int(R * 255), Int(G * 255), Int(B * 255))
End Function