The GtkRadiant sources as originally released under the GPL license.

plugins/entity/angle.h

@@ -0,0 +1,101 @@
+/*
+Copyright (C) 2001-2006, William Joseph.
+All Rights Reserved.
+
+This file is part of GtkRadiant.
+
+GtkRadiant is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+GtkRadiant is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined(INCLUDED_ANGLE_H)
+#define INCLUDED_ANGLE_H
+
+#include "ientity.h"
+
+#include "math/quaternion.h"
+#include "generic/callback.h"
+#include "stringio.h"
+
+const float ANGLEKEY_IDENTITY = 0;
+
+inline void default_angle(float& angle)
+{
+  angle = ANGLEKEY_IDENTITY;
+}
+inline void normalise_angle(float& angle)
+{
+  angle = static_cast<float>(float_mod(angle, 360.0));
+}
+inline void read_angle(float& angle, const char* value)
+{
+  if(!string_parse_float(value, angle))
+  {
+    angle = 0;
+  }
+  else
+  {
+    normalise_angle(angle);
+  }
+}
+inline void write_angle(float angle, Entity* entity)
+{
+  if(angle == 0)
+  {
+    entity->setKeyValue("angle", "");
+  }
+  else
+  {
+    char value[64];
+    sprintf(value, "%g", angle);
+    entity->setKeyValue("angle", value);
+  }
+}
+
+class AngleKey
+{
+  Callback m_angleChanged;
+public:
+  float m_angle;
+
+
+  AngleKey(const Callback& angleChanged)
+    : m_angleChanged(angleChanged), m_angle(ANGLEKEY_IDENTITY)
+  {
+  }
+
+  void angleChanged(const char* value)
+  {
+    read_angle(m_angle, value);
+    m_angleChanged();
+  }
+  typedef MemberCaller1<AngleKey, const char*, &AngleKey::angleChanged> AngleChangedCaller;
+
+  void write(Entity* entity) const
+  {
+    write_angle(m_angle, entity);
+  }
+};
+
+inline float angle_rotated(float angle, const Quaternion& rotation)
+{
+  return matrix4_get_rotation_euler_xyz_degrees(
+    matrix4_multiplied_by_matrix4(
+      matrix4_rotation_for_z_degrees(angle),
+      matrix4_rotation_for_quaternion_quantised(rotation)
+    )
+  ).z();
+}
+
+#endif