98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
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/**********************************************************************
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arcball.h
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GLUI User Interface Toolkit (LGPL)
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Copyright (c) 1998 Paul Rademacher
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Feb 1998, Paul Rademacher (rademach@cs.unc.edu)
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Oct 2003, Nigel Stewart - GLUI Code Cleaning
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WWW: http://sourceforge.net/projects/glui/
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Forums: http://sourceforge.net/forum/?group_id=92496
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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---------------------------------------------------------------------
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A C++ class that implements the Arcball, as described by Ken
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Shoemake in Graphics Gems IV.
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This class takes as input mouse events (mouse down, mouse drag,
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mouse up), and creates the appropriate quaternions and 4x4 matrices
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to represent the rotation given by the mouse.
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This class is used as follows:
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- initialize [either in the constructor or with set_params()], the
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center position (x,y) of the arcball on the screen, and the radius
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- on mouse down, call mouse_down(x,y) with the mouse position
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- as the mouse is dragged, repeatedly call mouse_motion() with the
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current x and y positions. One can optionally pass in the current
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state of the SHIFT, ALT, and CONTROL keys (passing zero if keys
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are not pressed, non-zero otherwise), which constrains
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the rotation to certain axes (X for CONTROL, Y for ALT).
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- when the mouse button is released, call mouse_up()
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Axis constraints can also be explicitly set with the
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set_constraints() function.
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The current rotation is stored in the 4x4 float matrix 'rot'.
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It is also stored in the quaternion 'q_now'.
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**********************************************************************/
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#ifndef GLUI_ARCBALL_H
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#define GLUI_ARCBALL_H
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#include "glui_internal.h"
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#include "algebra3.h"
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#include "quaternion.h"
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class Arcball
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{
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public:
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Arcball();
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Arcball(mat4 *mtx);
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Arcball(const vec2 ¢er, float radius);
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void set_damping(float d);
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void idle();
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void mouse_down(int x, int y);
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void mouse_up();
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void mouse_motion(int x, int y, int shift, int ctrl, int alt);
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void mouse_motion(int x, int y);
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void set_constraints(bool constrain_x, bool constrain_y);
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void set_params(const vec2 ¢er, float radius);
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void reset_mouse();
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void init();
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vec3 constrain_vector(const vec3 &vector, const vec3 &axis);
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vec3 mouse_to_sphere(const vec2 &p);
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//public:
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int is_mouse_down; /* true for down, false for up */
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int is_spinning;
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quat q_now, q_down, q_drag, q_increment;
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vec2 down_pt;
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mat4 rot, rot_increment;
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mat4 *rot_ptr;
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bool constraint_x, constraint_y;
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vec2 center;
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float radius, damp_factor;
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int zero_increment;
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};
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#endif
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