[vtkusers] Error in vtkTextActor when creating a vtkScalarBarActor with no title

[David Gobbi]

That fixes the problem.

As for the slow-down with " ", I might dig deeper but really it isn't
much of an issue (the only reason I tried it was because "" was
generating warnings).

Thanks!

 - David



On Wed, Mar 11, 2015 at 7:49 AM, David Lonie <david.lonie at kitware.com>
wrote:

> This should clean up the errors for empty inputs:
>
> http://review.source.kitware.com/#/t/5562/
>
> I'm not sure why " " would slow down the bbox calculation, and I couldn't
> reproduce that here.
>
> On Wed, Mar 11, 2015 at 8:53 AM, David Lonie <david.lonie at kitware.com>
> wrote:
>
>> Hi David,
>>
>> None of those things should be happening -- I'll take a look.
>>
>> Dave
>>
>> On Tue, Mar 10, 2015 at 7:34 PM, David Gobbi <david.gobbi at gmail.com>
>> wrote:
>>
>>> This may sound like a silly, but vtkScalarBarActor is giving me trouble.
>>> I'm using the master branch.
>>>
>>> If I don't call SetTitle, the vtkScalarBarActor gives me this error:
>>>
>>>     vtkTextActor::SetInput was passed an uninitialized string
>>>
>>> If I call SetTitle("") with an empty string, I get this error:
>>>
>>>     vtkOpenGLTexture: No scalar values found for texture input!
>>>
>>> Finally, if I call SetTitle(" "), i.e. give it a space character, then
>>> sometimes
>>> when I render the program gets stuck for a few seconds in the following
>>> function:
>>>
>>> vtkFreeTypeTools::CalculateBoundingBox<vtkUnicodeString>().
>>>
>>> Is there something that makes computing the bounding box of a single
>>> space character difficult for freetype?  And why does vtkScalarBarActor
>>> require the user to set a title?
>>>
>>>  - David
>>>
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