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