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This topic is the result of running clang-tidy to
modernize our usage of NULL and 0 to nullptr. It also
includes some manual and semi manual changes where
clang-tidy would not be expected to work (such as in
comments, or classes not compiled on this build)

There are definitely many comments and occurances that
this topic misses that we will need to fix over time.

Found and auto-fixed by clang-tidy’s readability-redundant-control-flow check.

Though I did have to manualy fix whitespace after it.

This commit reindents the code with the following utility:
Utilities/Maintenance/vtk-reindent-code.py

This utility changes the positions of the braces so that they are no
longer indented relative to the code block they reside in.

The bash command line used was the following:

for d in Charts Common Deprecated Domains Examples Filters GUISupport \
         Geovis IO Imaging Infovis Interaction Parallel Rendering \
         Testing Views Web Wrapping; do
  for e in cxx cxx.in txx txx.in hxx hxx.in h h.in c c.in; do
    find "${d}" -name "*.${e}" -exec \
      python Utilities/Maintenance/vtk_reindent_code.py {} +
  done
done

Code extracted from:

    https://gitlab.kitware.com/third-party/proj.git

at commit 41bdf05361007f8c5186f3df9944d86bb273ed13 (for/vtk).

Move source files from their former monolithic VTK location to their new
location in modular VTK without modification.  This preserves enough
information for "git blame -M" and "git log --follow" to connect
modularized VTK files to their original location and history.

Co-Author: Marcus D. Hanwell <marcus.hanwell@kitware.com>
Co-Author: Chris Harris <chris.harris@kitware.com>
Co-Author: Brad King <brad.king@kitware.com>
Co-Author: Nikhil Shetty <nikhil.shetty@kitware.com>

By default vtkScalarsToColorsItem uses the bounds defined by the transfer
function range. The user might want to use different bounds.

-You can edit control points in 2 fashions:
 If vtkControlPointsItem::StrokeMode is true, you can "draw" points while
the left mouse button is down, it will add control points under the mouse
cursor.
 If vtkControlPointsItem::StrokeMode is false, you can drag&drop existing
points. SwitchPointsMode control the behavior to follow when a point
crosses another.
In both modes, if you click the left button mouse not on a point, a point is
created under the mouse cursor.
-Add vtkCompositeControlPointsItem to mix ct function and opacity function.
It creates points for Color Transfer and Opacity
functions.Both functions will share the same control points.
-Add vtkControlPointsItem::EditPoint to control midpoint and sharpness
-Support null transfer functions in the ScalarsToColors items

-You can edit control points in 2 fashions:
 If vtkControlPointsItem::StrokeMode is true, you can "draw" points while
the left mouse button is down, it will add control points under the mouse
cursor.
 If vtkControlPointsItem::StrokeMode is false, you can drag&drop existing
points. SwitchPointsMode control the behavior to follow when a point
crosses another.
In both modes, if you click the left button mouse not on a point, a point is
created under the mouse cursor.
-Add vtkCompositeControlPointsItem to mix ct function and opacity function.
It creates points for Color Transfer and Opacity
functions.Both functions will share the same control points.
-Add vtkControlPointsItem::EditPoint to control midpoint and sharpness
-Support null transfer functions in the ScalarsToColors items

and vtkCompositeTransferFunctionItem), specially if the option
MaskAboveCurve is off.

The opacity is overwritten by MapScalarsThroughTable2

They can be added into any vtkChartXY. Their size depend on the
vtkScalarsToColors (vtkLookupTable or vtkColorTransferFunction) range.