I'm trying to merge 2 colors and to do so I created a very simple function:
Public Function MixColors(color1 As Color, color2 As Color) As Color
Dim a, r, g, b As Byte
a = (color1.A + color2.A) \ 2
r = (color1.R + color2.R) \ 2
g = (color1.G + color2.G) \ 2
b = (color1.B + color2.B) \ 2
Return Color.FromArgb(a, r, g, b)
End Function
The problem is I get an OverflowException at the very first operation and I can't understand why.
I tried changing the type of the variables first to Integer and then to Double with no change in the results.
I also tried switching from the \ operator to the / one but still no change.
Does the type of the variables (color.A) influence the execution?
As Hans has already commented, if you add two bytes(like color1.A+color1.B) you get a byte as result which has a max value of 255. You have to cast it to Int32, for example with CInt. Color.FromArgb takes 4 integers anyway. So following should work:
Dim a, r, g, b As Int32
a = (CInt(color1.A) + CInt(color2.A)) \ 2
r = (CInt(color1.R) + CInt(color2.R)) \ 2
g = (CInt(color1.G) + CInt(color2.G)) \ 2
b = (CInt(color1.B) + CInt(color2.B)) \ 2
Return Color.FromArgb(a, r, g, b)