void ofxCamera::setViewByMouse(int x, int y)
{
ofxVec2f mouseDelta;
float MouseSensitivity = 10.0f;
float MiddleX = ofGetWidth()/2;
float MiddleY = ofGetHeight()/2;
if((x == MiddleX) && (y == MiddleY))
return;
// otherwise move the mouse back to the middle of the screen
glutWarpPointer(MiddleX, MiddleY);
mouseDelta.x = (MiddleX - x)/MouseSensitivity;
mouseDelta.y = (MiddleY - y)/MouseSensitivity;
// get the axis to rotate around the x-axis.
ofxVec3f axis = eyeCoord - posCoord;
axis.cross(upVec);
// To be able to use the quaternion conjugate, the axis to
// rotate around must be normalized.
axis.normalize();
// Rotate around the x axis
qrotate(axis,mouseDelta.y);
// Rotate around the y axis
qrotate(ofxVec3f(0, 1, 0),mouseDelta.x);
}
void view_turn(view *V, const double *w)
{
#if 0
double M[16], T[16], q[4], a[3], b[3], c[3], t[3];
assert(V);
/* Transform the mark and drag vectors from eye space into the world */
/* space current at the time of the mark. */
state_matrix(M, &V->mark);
mtranspose(T, M);
vnormalize(t, V->a);
vtransform(a, T, t);
vnormalize(t, w);
vtransform(b, T, t);
/* These determine the axis and angle of rotation. Find the quaternion. */
vcrs(t, a, b);
vnormalize(c, t);
qrotate(q, c, acos(vdot(a, b)));
/* Accumulate this quaternion with the view state, rotating the view. */
qmultiply(view_curr(V)->q, V->mark.q, q);
#endif
}