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

[David Lonie]

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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