update bundled_deps

bundled_deps/libigl/igl/trackball.h

@@ -0,0 +1,80 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+// 
+// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public License 
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can 
+// obtain one at http://mozilla.org/MPL/2.0/.
+#ifndef IGL_TRACKBALL_H
+#define IGL_TRACKBALL_H
+#include "igl_inline.h"
+#include <Eigen/Core>
+#include <Eigen/Geometry>
+
+namespace igl
+{
+  // Applies a trackball drag to identity
+  // Inputs:
+  //   w  width of the trackball context
+  //   h  height of the trackball context
+  //   speed_factor  controls how fast the trackball feels, 1 is normal
+  //   down_mouse_x  x position of mouse down
+  //   down_mouse_y  y position of mouse down
+  //   mouse_x  current x position of mouse
+  //   mouse_y  current y position of mouse
+  // Outputs:
+  //   quat  the resulting rotation (as quaternion)
+  template <typename Q_type>
+  IGL_INLINE void trackball(
+    const double w,
+    const double h,
+    const Q_type speed_factor,
+    const double down_mouse_x,
+    const double down_mouse_y,
+    const double mouse_x,
+    const double mouse_y,
+    Q_type * quat);
+
+  // Applies a trackball drag to a given rotation
+  // Inputs:
+  //   w  width of the trackball context
+  //   h  height of the trackball context
+  //   speed_factor  controls how fast the trackball feels, 1 is normal
+  //   down_quat  rotation at mouse down, i.e. the rotation we're applying the
+  //     trackball motion to (as quaternion)
+  //   down_mouse_x  x position of mouse down
+  //   down_mouse_y  y position of mouse down
+  //   mouse_x  current x position of mouse
+  //   mouse_y  current y position of mouse
+  // Outputs:
+  //   quat  the resulting rotation (as quaternion)
+  template <typename Q_type>
+  IGL_INLINE void trackball(
+    const double w,
+    const double h,
+    const Q_type speed_factor,
+    const Q_type * down_quat,
+    const double down_mouse_x,
+    const double down_mouse_y,
+    const double mouse_x,
+    const double mouse_y,
+    Q_type * quat);
+  // Eigen wrapper.
+  template <typename Scalardown_quat, typename Scalarquat>
+  IGL_INLINE void trackball(
+    const double w,
+    const double h,
+    const double speed_factor,
+    const Eigen::Quaternion<Scalardown_quat> & down_quat,
+    const double down_mouse_x,
+    const double down_mouse_y,
+    const double mouse_x,
+    const double mouse_y,
+    Eigen::Quaternion<Scalarquat> & quat);
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "trackball.cpp"
+#endif
+
+#endif