diff options
author | Edward Welbourne <edward.welbourne@qt.io> | 2017-03-22 13:18:52 +0100 |
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committer | Edward Welbourne <edward.welbourne@qt.io> | 2017-06-20 09:53:46 +0000 |
commit | 02b7ec05d5713aec67577cebc18e5906b5a98598 (patch) | |
tree | a8b7fe65eb276c50b5617e808ec26ddfdf065ab8 /examples/widgets/graphicsview/collidingmice/mouse.cpp | |
parent | 82deb0ad160459c16c77cbbea69b56387723c3a4 (diff) |
Be (somewhat more) consistent about the value of pi
Use M_PI (and friends), where possible, in favor of hand-coded
approximations of various (in)accuracies. Where that's not available
(e.g. fragment shaders), use the same value that qmath.h uses for
M_PI, for consistency. Replaced math.h with qmath.h in places that
defined a fall-back in case math.h omits it (it's not in the C++
standard, although M_PI is in POSIX); or removed this entirely where
it wasn't used.
Reworked some code to reduce the amount of arithmetic needed, in the
process; e.g. pulling common factors out of loops. Revised an
example's doc to not waste time talking about using a six-sig-fig
value for pi (which we no longer do) - it really wasn't relevant, or
anything to be proud of; nor did the doc mention its later use.
Task-number: QTBUG-58083
Change-Id: I5a31e3a2b6a823b97a43209bed61a37b9aa6c05f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'examples/widgets/graphicsview/collidingmice/mouse.cpp')
-rw-r--r-- | examples/widgets/graphicsview/collidingmice/mouse.cpp | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/examples/widgets/graphicsview/collidingmice/mouse.cpp b/examples/widgets/graphicsview/collidingmice/mouse.cpp index cc1a15cd82..298e4aae64 100644 --- a/examples/widgets/graphicsview/collidingmice/mouse.cpp +++ b/examples/widgets/graphicsview/collidingmice/mouse.cpp @@ -53,11 +53,10 @@ #include <QGraphicsScene> #include <QPainter> #include <QStyleOption> +#include <qmath.h> -#include <cmath> - -static const double Pi = 3.14159265358979323846264338327950288419717; -static double TwoPi = 2.0 * Pi; +const qreal Pi = M_PI; +const qreal TwoPi = 2 * M_PI; static qreal normalizeAngle(qreal angle) { |