logic/tracker, dinput, tracker/joystick: fix rounding errors

Issue: #487
Reported-by: @H-Bear-22
Closes #487

Also use a power of two for joy_axis_size. Floats are base 2.

axis_max in tracker/joystick had a fencepost error.

1 files changed, 5 insertions, 1 deletions

diff --git a/logic/tracker.cpp b/logic/tracker.cpp
index dc148eba..fd6ecfe7 100644
--- a/logic/tracker.cpp
+++ b/logic/tracker.cpp
@@ -141,9 +141,13 @@ void Tracker::logic()
     {
         using std::fmod;
         using std::copysign;
+        using std::fabs;
 
         const double x = value(i);
-        value(i) = fmod(x + copysign(180, x), 360) - copysign(180, x);
+        if (fabs(x) - 1e-2 > 180)
+            value(i) = fmod(x - copysign(180, -x), 360) + copysign(180, x);
+        else
+            value(i) = clamp(x, -180, 180);
     }
 
     logger.write_pose(raw); // raw