Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegames@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 41 insertions, 0 deletions

diff --git a/kspaceduel/mathroutines.cpp b/kspaceduel/mathroutines.cpp
new file mode 100644
index 00000000..4597a3ad
--- /dev/null
+++ b/kspaceduel/mathroutines.cpp
@@ -0,0 +1,41 @@
+#include "mathroutines.h"
+#include "math.h"
+
+double rectToAngle(double x,double y)
+{
+   double phi=0;
+   if(fabs(x)<1e-6)
+   {
+      if(y>0)
+         phi=M_PI_2;
+      else
+         phi=-M_PI_2;
+   }
+   else
+   {
+      phi=atan(y/x);
+      if(x<0)
+         phi+=M_PI;
+   }
+   if(phi>M_PI)
+      phi-=2*M_PI;
+   return phi;
+}
+
+double average(double phi1,double phi2)
+{
+   return phi2+difference(phi1,phi2)/2.0;
+}
+
+double difference(double phi1,double phi2)
+{
+   double dif;
+
+   dif=phi1-phi2;
+   while(dif>M_PI)
+      dif-=2*M_PI;
+   while(dif<-M_PI)
+      dif+=2*M_PI;
+
+   return dif;
+}