public void StartTransform()
{
m_isTransforming = true;
m_hasTransformed = false;
m_hasSetMouseOffset = false;
m_wrapOffset = Vector2.Zero;
m_totalTranslation = Vector3.Zero;
m_totalRotation = Vector3.Zero;
m_currentRotation = Quaterniond.Identity;
m_totalScale = Vector3.One;
// Set the rotation direction.
if (m_mode == FTransformMode.Rotation)
{
// We need to determine which side of the gizmo they are on, so that goes the expected direction when
// we pull up/down in screenspace.
Vector3 rotAxis;
if (m_selectedAxes == FSelectedAxes.X)
{
rotAxis = Vector3.UnitX;
}
if (m_selectedAxes == FSelectedAxes.Y)
{
rotAxis = Vector3.UnitY;
}
else
{
rotAxis = Vector3.UnitZ;
}
Vector3 dirFromGizmoToHitPoint = (m_hitPoint - m_position).Normalized();
m_moveDir = Vector3.Cross(rotAxis, dirFromGizmoToHitPoint);
}
// Set the scale direction.
else if (m_mode == FTransformMode.Scale)
{
// If we're transforming only on one axis, then the directon is in the selected axis.
if (GetNumSelectedAxes() == 1)
{
if (ContainsAxis(m_selectedAxes, FSelectedAxes.X))
{
m_moveDir = Vector3.Transform(Vector3.UnitX, m_rotation.ToSinglePrecision());
}
if (ContainsAxis(m_selectedAxes, FSelectedAxes.Y))
{
m_moveDir = Vector3.Transform(Vector3.UnitY, m_rotation.ToSinglePrecision());
}
else
{
m_moveDir = Vector3.Transform(Vector3.UnitZ, m_rotation.ToSinglePrecision());
}
}
// Two axes however, means interpolate between both.
if (GetNumSelectedAxes() == 2)
{
Vector3 axisA = ContainsAxis(m_selectedAxes, FSelectedAxes.X) ? Vector3.Transform(Vector3.UnitX, m_rotation.ToSinglePrecision()) : Vector3.Transform(Vector3.UnitY, m_rotation.ToSinglePrecision());
Vector3 axisB = ContainsAxis(m_selectedAxes, FSelectedAxes.Z) ? Vector3.Transform(Vector3.UnitZ, m_rotation.ToSinglePrecision()) : Vector3.Transform(Vector3.UnitY, m_rotation.ToSinglePrecision());
m_moveDir = (axisA + axisB) / 2f;
}
}
}