Use C++ <cmath> instead of <math.h>

Including math.h can pollute the default namespace, and break
some compilers if cmath versions of the method are declared as using.

Switching to C++ math functions also greatly simplifies handling of
float qreal as C++ automatically chooses the right method.

[ChangeLog][QtCore][QtMath] qmath.h no longer includes math.h, so any
sources depending on that indirect inclusion may fail to build.

Change-Id: I4d0e331dafba354ec05dc5052e61ef4ff8d387fe
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/plugins/platforms/windows/qwindowstabletsupport.cpp b/src/plugins/platforms/windows/qwindowstabletsupport.cpp
index 1818d614fd..7b871be015 100644
--- a/src/plugins/platforms/windows/qwindowstabletsupport.cpp
+++ b/src/plugins/platforms/windows/qwindowstabletsupport.cpp
@@ -455,10 +455,10 @@ bool QWindowsTabletSupport::translateTabletPacketEvent()
             // X Tilt = arctan(X / Z)
             // Y Tilt = arctan(Y / Z)
             const double radAzim = (packet.pkOrientation.orAzimuth / 10.0) * (M_PI / 180);
-            const double tanAlt = tan((abs(packet.pkOrientation.orAltitude / 10.0)) * (M_PI / 180));
+            const double tanAlt = std::tan((std::abs(packet.pkOrientation.orAltitude / 10.0)) * (M_PI / 180));
 
-            const double degX = atan(sin(radAzim) / tanAlt);
-            const double degY = atan(cos(radAzim) / tanAlt);
+            const double degX = std::atan(std::sin(radAzim) / tanAlt);
+            const double degY = std::atan(std::cos(radAzim) / tanAlt);
             tiltX = int(degX * (180 / M_PI));
             tiltY = int(-degY * (180 / M_PI));
             rotation = 360.0 - (packet.pkOrientation.orTwist / 10.0);