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Rather than 'fake' the log support in the context items, integrate
with the charting code and use the existing log scaling implementation.

This also fixes some issue with the charts log implementation.

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).

Cleaning up issues with the context-items related to tranfer function editor.

+ Added support for log-mapped color-transfer function. We ensure that when
  using log-scale, the color transfer function widget also enter log-space.

+ vtkPiecewiseControlPointsItem had a bug resulting it deleting of end points
  even when told otherwise. Fixed that.

+ Added new event vtkControlPointsItem::PointsModifiedEvent which if fired when
  control points are changed making it easier for application to do something
  when the points are changed.

+ Improved the usability by adding ability to label control points.

Change-Id: If02bc1139f6ccb3d7c2198b07d10491f902bafda

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>

This fixes a number of misspellings in the comments of
the source files in VTK/Charts. The misspellings were
found using the codespell tool.

Change-Id: I747478f9904c352ce09ad6cb300b2d7a68691909

Change-Id: I43ddf9095a9b019aea3dc1536543954796470d38

The old value 255 was not large enough when the chart is displayed with a
1024 pixel width. It was make the texture pixelated.

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

The x coordinates were not computed based on the bounds but from 0 to the
array dimension.
Update the test to reveal the issue.

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

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

vtkPiecewiseFunctionItem and vtkCompositeTransferFunctionItem can mask
pixels above the alpha value.