Box command and Alphachannel

[Allanon]

Hello,
I've noticed that creating a brush with alphachannel (using flag Alphachannel = True) and then using the Box command in the brush with an ARGB fill color, the command erases the alphachannel.
Using lines with the same ARGB color works fine, maybe Box command can't do this operation?

[airsoftsoftwair]

Hmm, what exactly are you trying to do? Box() will fill the specified rectangular area in the alpha channel with the alpha value specified in SetAlphaIntensity(). The alpha channel will only be "erased" if the alpha intensity is set to 0.

[Allanon]

Ok, here is an example:

Code: Select all

Local b = CreateBrush(Nil, 100, 100, #WHITE, { Alphachannel = True, Clear = True })
SelectBrush(b, #SELMODE_COMBO)
   SetFillStyle(#FILLCOLOR)
   Box(0, 0, 100, 100, $88FF0000)
EndSelect
DisplayBrush(b, 0, 0)

The above code will overwrite completely what's in the background, while the following code:

Code: Select all

Local b = CreateBrush(Nil, 100, 100, #WHITE, { Alphachannel = True, Clear = True })
SelectBrush(b, #SELMODE_COMBO)
   For Local i = 0 To 100
      Line(0, i, 100, i, $88FF0000)
   Next
EndSelect
DisplayBrush(b, 0, 0)

...preserves the transparency, so I can see what's in the background like it should, seems that the Box() command remove the alphachannel of the brush

[airsoftsoftwair]

Um, yeah, this is a bug then I'll fix it. Thanks for the report!

[Allanon]

Great! I was going mad trying to figure out what was the problem