[reportlab-users] Slightly confused with setFillGray

[Tim Roberts]

Frank wrote:
>
> This is a minor point, but I want to make sure I understand it.
>
> I thought that setFillGray(0), setFillColorRGB(0, 0 ,0), and 
> setFillColor(colors.black) were interchangeable.
>
> I have discovered that, if you have previously executed 
> setFillColor(colors.transparent), alpha is set to 0.
>
> If you then execute any of the above commands, only 
> setFillColor(colors.black) resets the alpha value. The other two do 
> not, resulting in text being invisible.
>
> Am I missing something?

Nope, that's the way it works.  setFillGray, setFillColorRGB, 
setStrokeGray, and SetStrokeColorRGB all have an additional parameter to 
specify the alpha value.  If you don't supply a value, the current alpha 
value is retained.  "colors.black" happens to include all four components.

    C:\tmp>python
    Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916
    64 bit (AMD64)] on win32
    Type "help", "copyright", "credits" or "license" for more information.
     >>> from reportlab.lib import colors
     >>> colors.black
    Color(0,0,0,1)
     >>>

-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.

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