From: curt <curt>
Date: Sun, 8 Jul 2001 23:37:14 +0000 (+0000)
Subject: Allow other routines to increment/decrement goal_view_offset while keeping it
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=4520173d9be567eac7ca55e5a604a322b9b0e43d;p=flightgear.git

Allow other routines to increment/decrement goal_view_offset while keeping it
in the allowable 0-360 range.
---

diff --git a/src/Main/fg_props.cxx b/src/Main/fg_props.cxx
index 9c0bdb66d..32b3f624a 100644
--- a/src/Main/fg_props.cxx
+++ b/src/Main/fg_props.cxx
@@ -180,8 +180,19 @@ getGoalViewOffset ()
 static void
 setGoalViewOffset (double offset)
 {
-  globals->get_current_view()
-    ->set_goal_view_offset(offset * SGD_DEGREES_TO_RADIANS);
+    while ( offset < 0 ) {
+	offset += 360.0;
+    }
+    while ( offset > 360.0 ) {
+	offset -= 360.0;
+    }
+    // Snap to center if we are close
+    if ( fabs( offset ) < 1.0 ) {
+	offset = 0.0;
+    }
+
+    globals->get_current_view()
+	->set_goal_view_offset(offset * SGD_DEGREES_TO_RADIANS);
 }
 
 
diff --git a/src/Main/viewer.hxx b/src/Main/viewer.hxx
index 4e74425f0..107401a37 100644
--- a/src/Main/viewer.hxx
+++ b/src/Main/viewer.hxx
@@ -142,6 +142,12 @@ public:
     inline void set_goal_view_offset( double a) {
 	set_dirty();
 	goal_view_offset = a;
+	while ( goal_view_offset < 0 ) {
+	    goal_view_offset += 360.0;
+	}
+	while ( goal_view_offset > 360.0 ) {
+	    goal_view_offset -= 360.0;
+	}
     }
     inline void set_reverse_view_offset( bool val ) {
 	reverse_view_offset = val;