[Pspp-commits] [SCM] GNU PSPP branch, master, updated. v0.8.4-50-gaad0ae4

[John Darrington]

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- Log -----------------------------------------------------------------
commit aad0ae4913ecd01ccc954f8828623ad5da35cd1b
Author: John Darrington <address@hidden>
Date:   Tue Jan 6 07:25:21 2015 +0100

    New module to perform decimal floating point arithmetic for charts.
    
    This change adds a small module to perform floating point arithmetic
    with a decimal base, and uses it to calculate the graticule marks for
    charts.
    
    Rationale:  Graticule marks want to be displayed in decimal.  However
    not all decimal values can be represented in a double precision
    floating point binary.  This approach pushes the precision loss from
    the value of the mark, to the position on the chart - we don't
    particularly care if a tick mark is a fraction of a pixel out of place,
    but we do care if 4.0 is displayed as 3.9999999999
    
    Reviewed-by: Ben Pfaff

-----------------------------------------------------------------------

Summary of changes:
 src/math/automake.mk                               |    1 +
 src/math/chart-geometry.c                          |  130 ++++-
 src/math/chart-geometry.h                          |    7 +-
 src/math/decimal.c                                 |  572 ++++++++++++++++++++
 src/math/decimal.h                                 |  114 ++++
 src/math/histogram.c                               |   15 +-
 src/output/cairo-chart.c                           |   48 +-
 src/output/cairo-chart.h                           |    4 +-
 src/output/charts/boxplot-cairo.c                  |    2 +-
 src/output/charts/np-plot-cairo.c                  |    8 +-
 src/output/charts/plot-hist-cairo.c                |   21 +-
 src/output/charts/roc-chart-cairo.c                |    4 +-
 src/output/charts/scatterplot-cairo.c              |    4 +-
 src/output/charts/scree-cairo.c                    |    4 +-
 src/output/charts/spreadlevel-cairo.c              |    4 +-
 tests/automake.mk                                  |   31 +
 .../misc.c => tests/math/chart-geometry-test.c     |   73 ++--
 tests/math/chart-geometry.at                       |   35 ++
 tests/math/chart-get-scale-test.c                  |   96 ++++
 tests/math/decimal-test.c                          |  347 ++++++++++++
 tests/math/decimal.at                              |    7 +
 21 files changed, 1431 insertions(+), 96 deletions(-)
 create mode 100644 src/math/decimal.c
 create mode 100644 src/math/decimal.h
 copy src/libpspp/misc.c => tests/math/chart-geometry-test.c (53%)
 create mode 100644 tests/math/chart-geometry.at
 create mode 100644 tests/math/chart-get-scale-test.c
 create mode 100644 tests/math/decimal-test.c
 create mode 100644 tests/math/decimal.at


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