[Paraview] Line Source and 3D widgets

[Utkarsh Ayachit]

* The LineSource in  "extended_sources" is a high-resolution line
source, used for filters such as StreamTracer. It's same as the
LineSource in "extended_sources" except for the default value for the
"Resolution".

* The PropertyGroup specified in the <Hints /> section is what tells
the GUI to create the interaction widget for this source to control
certain properties. There are a predefined set of values that can be
used for type which identifies each  type of widget provided by
ParaView such as LineSource/ImplicitPlane etc. Each type comes with a
predefined set of functions such as
"Point1WorldPosition"/'Point2WorldPosition" which are basically
properties on the widget. Now the <Property /> elements in the
PropertyGroup tell the GUI how these widget properties are to be
mapped to the filter/source properties. In case of the LineSource, we
are mapping the "Point1" property on the LineSource to the
"Point1WorldPosition" on the widget and so on.

Utkarsh


On Wed, Apr 22, 2009 at 11:58 AM, Jérôme <jerome.velut at gmail.com> wrote:
> Dear all,
>
> I want to mimic the Line Source of Paraview. So I ran into the XML in order
> to understand how the 3D widget is created, the one that makes available a
> picker through the 'P' key. Unfortunately, I didn't understand...
>
> 1- In sources.xml, I found a "LineSource" proxy description in the sources
> ProxyGroup, with label "Line" that match with the one available under the
> sources menu of Paraview.
> 2- In utilities.xml, I found another "LineSource" proxy, but with label
> "Line Source" in the extended_sources ProxyGroup.
>
> The XML looks very usual, with DoubleVectorProperty for each point and an
> IntVectorProperty for the output line resolution, except the PropertyGroup.
> I didn't find in the paraview book the explanation of this <Hint>
>
> My questions are:
> - What is the difference?
> - What are the keyword in these XML descriptions that activate the 3D
> widget?
> - Is the PropertyGroup involved in the interaction mecanism?
>
> Thank you all,
>
> Jerome
>
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