void PathFollow2D::_update_transform() {
if (!path)
return;
Ref<Curve2D> c =path->get_curve();
if (!c.is_valid())
return;
float o = offset;
if (loop)
o=Math::fposmod(o,c->get_baked_length());
Vector2 pos = c->interpolate_baked(o,cubic);
if (rotate) {
Vector2 n = (c->interpolate_baked(o+lookahead,cubic)-pos).normalized();
Vector2 t = -n.tangent();
pos+=n*h_offset;
pos+=t*v_offset;
set_rot(t.atan2());
} else {
pos.x+=h_offset;
pos.y+=v_offset;
}
set_pos(pos);
}
void camera::set_rot(const nya_math::vec3 &dir)
{
const float eps=1.0e-6f;
const nya_math::vec3 v=nya_math::vec3::normalize(dir);
const float xz_sqdist=v.x*v.x+v.z*v.z;
const float new_yaw=(xz_sqdist>eps*eps)? (-std::atan2(v.x,v.z)-nya_math::constants::pi) : m_rot.get_euler().y;
const float new_pitch=(fabsf(v.y)>eps)? (-std::atan2(v.y,sqrtf(xz_sqdist))) : 0.0f;
set_rot(nya_math::quat(new_pitch,new_yaw,0));
}
void Node2D::rotate(float p_radians) {
set_rot( get_rot() + p_radians);
}
void Node2D::_set_rotd(float p_angle) {
set_rot(Math::deg2rad(p_angle));
}
//----------------------------------------------------------------------------------------------
Matrix::Matrix(const Quaternion& rot, const Vector& pos)
{
set_rot(rot);
set_translation(pos);
}
//----------------------------------------------------------------------------------------------
void Matrix::set_rot(const Quaternion & q)
{
Matrix3f m;
q.ToMatrix(m);
set_rot(m);
}
void mat4::set_rot(const quat& q)
{
mat3 m;
q.ToMatrix(m);
set_rot(m);
}
void camera::set_rot(float yaw,float pitch,float roll)
{
const float a2r=nya_math::constants::pi/180.0f;
set_rot(nya_math::quat(pitch*a2r,yaw*a2r,roll*a2r));
}
void Node2D::rotate(float p_degrees) {
set_rot( get_rot() + p_degrees);
}
void VMDTitle::prepare() {
double elapsed = time_of_day() - starttime;
double delta;
// Prevent the title screen from hogging the CPU/GPU when there's
// nothing else going on. This is particularly important for users
// that start VMD and immediately start using Multiseq with no structure
// data loaded at all.
vmd_msleep(1); // sleep for 1 millisecond or more
if (elapsed < 5 + 3) { // display the title screen, no animation
if (!letterson) {
letterson = TRUE;
redraw_list();
}
return;
}
elapsed -= 3;
if (letterson) {
letterson = FALSE;
redraw_list();
}
if (elapsed < 30) { // just spin the VMD logo
delta = elapsed - 5;
rot_on();
set_rot(solve_position((float) delta, 25.0f, 0.0f, 360.0f*8.0f), 'y');
rot_off();
}
if (elapsed < 15) {
delta = elapsed - 5;
scale_on();
set_scale( 1.0f/(1.0f+ ((float) delta)/3.0f)); // and getting smaller
scale_off();
glob_trans_on();
// and moving up
set_glob_trans(0, 0.5f, solve_position((float) delta, 10.0f, 0.0f, 0.5f));
glob_trans_off();
return;
}
if (elapsed < 20) {
return;
}
// I am at ( 0 , 0.5, 0.5)
// I want to get to ( -.7 , 0.9 , 0.5) in 10 secs
if (elapsed < 30) {
delta = elapsed - 20;
glob_trans_on();
set_glob_trans(
solve_position((float) delta, 10.0f, 0.0f, -0.6f * disp->aspect()),
solve_position((float) delta, 10.0f, 0.5f, 0.8f),
solve_position((float) delta, 10.0f, 0.5f, 0.5f));
glob_trans_off();
scale_on();
set_scale(solve_position((float) delta, 10.0f, 1.0f/(1.0f+10.0f/3.0f), 0.25f));
scale_off();
return;
}
if (elapsed < 35)
return;
// just spin the VMD logo
delta = elapsed - 35;
rot_on();
set_rot((float) delta * 360.0f / 6.0f, 'y');
rot_off();
}