Fixed style and added check for bounds in [-pi,pi] interval.

numpy/random/src/distributions/distributions.c

@@ -844,19 +844,30 @@ double random_vonmises(bitgen_t *bitgen_state, double mu, double kappa) {
   }
   if (kappa < 1e-8) {
     return M_PI * (2 * next_double(bitgen_state) - 1);
-  } else {
+  }
+  else {
     /* with double precision rho is zero until 1.4e-8 */
     if (kappa < 1e-5) {
       /*
        * second order taylor expansion around kappa = 0
        * precise until relatively large kappas as second order is 0
        */
       s = (1. / kappa + kappa);
-    } else {
-      /* Fallback to normal distribution for big values of kappa*/
-      if (kappa > 1e6){
-        return mu + sqrt(1/kappa) * random_standard_normal(bitgen_state);
-      }else{
+    }
+    else {
+      /* Fallback to normal distribution for big values of kappa */
+      if (kappa > 1e6) {
+        result = mu + sqrt(1. / kappa) * random_standard_normal(bitgen_state);
+        /* Check if result is within bounds */
+        if (result < -M_PI) {
+          return result + 2*M_PI;
+        }
+        if (result > M_PI) {
+          return result - 2*M_PI;
+        }
+        return result;
+      }
+      else {
         double r = 1 + sqrt(1 + 4 * kappa * kappa);
         double rho = (r - sqrt(2 * r)) / (2 * kappa);
         s = (1 + rho * rho) / (2 * rho);