[reportlab-users] Slightly confused with setFillGray

Tim Roberts timr at probo.com
Wed Jan 15 15:06:03 EST 2020

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.

    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

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist2.pair.net/pipermail/reportlab-users/attachments/20200115/9560f8e4/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 3389 bytes
Desc: S/MIME Cryptographic Signature
URL: <https://pairlist2.pair.net/pipermail/reportlab-users/attachments/20200115/9560f8e4/attachment.bin>

More information about the reportlab-users mailing list