void Trackball::motion(int x, int y)
{
GLfloat current_position[3], dx, dy, dz;
if (tb_tracking == GL_FALSE)
return;
_tbPointToVector(x, y, tb_width, tb_height, current_position);
/* calculate the angle to rotate by (directly proportional to the
length of the mouse movement */
dx = current_position[0] - tb_lastposition[0];
dy = current_position[1] - tb_lastposition[1];
dz = current_position[2] - tb_lastposition[2];
tb_angle = 90.0f * sqrtf(dx * dx + dy * dy + dz * dz);
/* calculate the axis of rotation (cross product) */
tb_axis[0] = tb_lastposition[1] * current_position[2] -
tb_lastposition[2] * current_position[1];
tb_axis[1] = tb_lastposition[2] * current_position[0] -
tb_lastposition[0] * current_position[2];
tb_axis[2] = tb_lastposition[0] * current_position[1] -
tb_lastposition[1] * current_position[0];
/* reset for next time */
tb_lasttime = (int)(1000*clock()/CLOCKS_PER_SEC);
tb_lastposition[0] = current_position[0];
tb_lastposition[1] = current_position[1];
tb_lastposition[2] = current_position[2];
/* remember to draw new position */
//glutPostRedisplay();
}
void tbMotion(int x, int y)
{
GLfloat current_position[3], dx, dy, dz;
assert(tb_button != -1);
if (tb_tracking == GL_FALSE)
return;
_tbPointToVector(x, y, tb_width, tb_height, current_position);
/* calculate the angle to rotate by (directly proportional to the
length of the mouse movement */
dx = current_position[0] - tb_lastposition[0];
dy = current_position[1] - tb_lastposition[1];
dz = current_position[2] - tb_lastposition[2];
tb_angle = 90.0 * sqrt(dx * dx + dy * dy + dz * dz);
/* calculate the axis of rotation (cross product) */
tb_axis[0] = tb_lastposition[1] * current_position[2] -
tb_lastposition[2] * current_position[1];
tb_axis[1] = tb_lastposition[2] * current_position[0] -
tb_lastposition[0] * current_position[2];
tb_axis[2] = tb_lastposition[0] * current_position[1] -
tb_lastposition[1] * current_position[0];
/* reset for next time */
tb_lasttime = glutGet(GLUT_ELAPSED_TIME);
tb_lastposition[0] = current_position[0];
tb_lastposition[1] = current_position[1];
tb_lastposition[2] = current_position[2];
/* remember to draw new position */
glutPostRedisplay();
}
void _tbStartMotion(int x, int y, int button, int time)
{
assert(tb_button != -1);
tb_tracking = GL_TRUE;
tb_lasttime = time;
_tbPointToVector(x, y, tb_width, tb_height, tb_lastposition);
}
void
_tbStartMotion(GLfloat x, GLfloat y, int button, int time)
{
//printf("_tbStartMotion x%f y%f button%d time%d\n",x,y,button,time);
assert(tb_button != -1);
tb_tracking = GL_TRUE;
tb_lasttime = time;
_tbPointToVector(x, y, tb_width, tb_height, tb_lastposition);
}
void CTrackball::_tbStartMotion(int x, int y, int button, int time)
{
tb_tracking = GL_TRUE;
tb_lasttime = time;
_tbPointToVector(x, y, tb_width, tb_height, tb_lastposition);
}
