[reportlab-users] Wordaxe 0.3.0, ReportLab 2.2: Assertion Failure, cannot understand why...

[Henning von Bargen]

Harald Armin Massa wrote:


> while running a document in preparation for updating wordaxe /

> reportlab, I get the Assertion failure:

> 

> Assertion failure

> self.width=429.536000

> nFrags=31

> printrange=0:31

> printwidth=431.760000

> 0 SW() 0

> 1 SP( ) 2.224

> 2 SW(wegen) 23.568

> 3 SP( ) 2.224

> 4 SW(Sch?den,) 33.8

...

> 28 SW(beauftragte) 40.472

> 29 SP( ) 2.224

> 30 SW(Person) 25.344

> 

> asserted was:

> 

> if not abs(self.width - sum(getattr(f,"width",0) for f in

> fragments[print_indx_start:print_indx_end])) <= 1e-5:

> 

> and I a have no Idea WHY this get's asserted. My "first look"

> understanding is that this is checking that floating point errors stay

> below some point, but... what is the bigger idea behind this?


Harald,

the code you are mentioning is part of wordaxe, not ReportLab.
Please file a bug for wordaxe instead of posting to this list next time.

But to answer your question:

There's no bigger idea. The intention is just as you guessed:
When I coded NewParagraph, I assumed that the sum of the fragments' widths
should match self.width - since floats are used, the comparison is a bit fuzzy.
This is to assure that the paragraph doesn't "write across its border" when
finally it will be rendered.

Seems like either there's a bug in the wordaxe code or the assertion is wrong.
You may try to comment the assertion and carefully look at the generated PDF
for this paragraph.

Henning