/// <summary>
/// Update animation and pending changes.
/// </summary>
public void Update()
{
bool pending_changes = _pending_queue.Count() > 0;
_animation_is_active = _animation_is_active && pending_changes;
_current_time = time;
if (pending_changes == false)
{
return;
}
ChangeOperation op = _pending_queue.Last();
if (_animation_is_active)
{
double past_animation_time_s = _current_time - _animation_start_time;
if (past_animation_time_s < _animation_time_s)
{
// get change information
int axis_i = (int)op.axis;
int row_i = (int)op.row;
var cube_i = SubCubeIndices(op.axis, op.row);
// update the position model matrix of the affected sub cubes
foreach (var i in cube_i)
{
double angle = Radians(90.0) * (op.direction == RubiksGlobal.TDirection.left ? -1.0 : 1.0);
angle *= past_animation_time_s / _animation_time_s;
_animation[i] = CreateRotate((float)angle, RubiksGlobal.AxisVector(axis_i));
}
// Update the final model matrices of the sub cubes
UpdateM44Cubes();
return;
}
_animation_is_active = false;
}
else if (pending_changes)
{
_animation_is_active = true;
_animation_start_time = time;
return;
}
_pending_queue.RemoveAt(_pending_queue.Count() - 1);
Rotate(op);
// Update the final model matrices of the sub cubes
UpdateM44Cubes();
}
/// <summary>
/// Calculate the rotation of a part of the Rubik's cube.
/// Compute the new positions of the sub cubes and calculate the model matrices.
/// </summary>
/// <param name="op">specifies the change operation</param>
void Rotate(ChangeOperation op)
{
int axis_i = (int)op.axis;
int row_i = (int)op.row;
var cube_i = SubCubeIndices(op.axis, op.row);
// update the position model matrix of the affected sub cubes
Matrix4 rot_mat = _c_rot_mat[axis_i * 2 + (op.direction == RubiksGlobal.TDirection.left ? 0 : 1)];
foreach (var i in cube_i)
{
double angle = Radians(90.0) * (op.direction == RubiksGlobal.TDirection.left ? -1.0 : 1.0);
rot_mat = CreateRotate((float)angle, RubiksGlobal.AxisVector(axis_i));
_current_pos[i] = _current_pos[i] * rot_mat; // OpenTK `*`-operator is reversed
}
// Recalculate the index map of the cubes
int[,] indices = { { 0, 0 }, { 1, 0 }, { 2, 0 }, { 2, 1 }, { 2, 2 }, { 1, 2 }, { 0, 2 }, { 0, 1 } };
int[] current_map = (int[])_cube_map.Clone();
for (int i_o = 0; i_o < 8; ++i_o)
{
int j_n = (op.direction == RubiksGlobal.TDirection.left ? i_o + 6 : i_o + 2) % 8;
int[] ao = { 0, 0, 0 };
int[] an = { 0, 0, 0 };
ao[axis_i] = row_i;
an[axis_i] = row_i;
ao[(axis_i + 1) % 3] = indices[i_o, 0];
an[(axis_i + 1) % 3] = indices[j_n, 0];
ao[(axis_i + 2) % 3] = indices[i_o, 1];
an[(axis_i + 2) % 3] = indices[j_n, 1];
int ci_o = ao[0] + ao[1] * 3 + ao[2] * 9;
int ci_n = an[0] + an[1] * 3 + an[2] * 9;
_cube_map[ci_n] = current_map[ci_o];
}
// reset animation matrices
for (int i = 0; i < RubiksGlobal.NoOfCubes; ++i)
{
_animation[i] = Matrix4.Identity;
}
}
public ChangeOperation(Vector3 rot_axis, int sub_cube_i)
{
_axis = RubiksGlobal.Axis(rot_axis);
_direction = RubiksGlobal.Direction(rot_axis);
_row = RubiksGlobal.Row(_axis, sub_cube_i);
}