mirror of https://github.com/lianthony/NT4.0
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
2.5 KiB
91 lines
2.5 KiB
/*
|
|
* trackball.h
|
|
* A virtual trackball implementation
|
|
* Written by Gavin Bell for Silicon Graphics, November 1988.
|
|
*/
|
|
|
|
/*
|
|
* Initialize trackball in win32 environment
|
|
*/
|
|
extern void
|
|
trackball_Init( GLint width, GLint height );
|
|
|
|
extern void
|
|
trackball_Resize( GLint width, GLint height );
|
|
|
|
extern GLenum
|
|
trackball_MouseDown( int mouseX, int mouseY, GLenum button );
|
|
|
|
extern GLenum
|
|
trackball_MouseUp( int mouseX, int mouseY, GLenum button );
|
|
|
|
/* These next Mouse fns are required if both the trackbal and user
|
|
* need mouse events. Otherwise, can just supply above two functions
|
|
* to tk to call
|
|
*/
|
|
|
|
/*
|
|
* Mouse functions called directly on events
|
|
*/
|
|
extern void
|
|
trackball_MouseDownEvent( int mouseX, int mouseY, GLenum button );
|
|
|
|
extern void
|
|
trackball_MouseUpEvent( int mouseX, int mouseY, GLenum button );
|
|
|
|
/*
|
|
* Functions to register mouse event callbacks
|
|
*/
|
|
extern void
|
|
trackball_MouseDownFunc(GLenum (*)(int, int, GLenum));
|
|
|
|
extern void
|
|
trackball_MouseUpFunc(GLenum (*)(int, int, GLenum));
|
|
|
|
/*
|
|
* Calculate rotation matrix based on mouse movement
|
|
*/
|
|
void
|
|
trackball_CalcRotMatrix( GLfloat matRot[4][4] );
|
|
|
|
/*
|
|
* Pass the x and y coordinates of the last and current positions of
|
|
* the mouse, scaled so they are from (-1.0 ... 1.0).
|
|
*
|
|
* if ox,oy is the window's center and sizex,sizey is its size, then
|
|
* the proper transformation from screen coordinates (sc) to world
|
|
* coordinates (wc) is:
|
|
* wcx = (2.0 * (scx-ox)) / (float)sizex - 1.0
|
|
* wcy = (2.0 * (scy-oy)) / (float)sizey - 1.0
|
|
*
|
|
* The resulting rotation is returned as a quaternion rotation in the
|
|
* first paramater.
|
|
*/
|
|
void
|
|
trackball_calc_quat(float q[4], float p1x, float p1y, float p2x, float p2y);
|
|
|
|
/*
|
|
* Given two quaternions, add them together to get a third quaternion.
|
|
* Adding quaternions to get a compound rotation is analagous to adding
|
|
* translations to get a compound translation. When incrementally
|
|
* adding rotations, the first argument here should be the new
|
|
* rotation, the second and third the total rotation (which will be
|
|
* over-written with the resulting new total rotation).
|
|
*/
|
|
void
|
|
trackball_add_quats(float *q1, float *q2, float *dest);
|
|
|
|
/*
|
|
* A useful function, builds a rotation matrix in Matrix based on
|
|
* given quaternion.
|
|
*/
|
|
void
|
|
trackball_build_rotmatrix(float m[4][4], float q[4]);
|
|
|
|
/*
|
|
* This function computes a quaternion based on an axis (defined by
|
|
* the given vector) and an angle about which to rotate. The angle is
|
|
* expressed in radians. The result is put into the third argument.
|
|
*/
|
|
void
|
|
trackball_axis_to_quat(float a[3], float phi, float q[4]);
|