public static void Init(Group *self)
{
self->tag = Tag.Group;
Vec3.Zero(self->pos);
Vec2.One(self->scl);
self->rot = 0;
self->isTransformDirty = true;
self->isDepthDirty = true;
Mat2D.Identity(self->mat);
Mat2D.Identity(self->concatMat);
self->parentMat = null;
PtrLst.Init(&self->childLst);
}
void ConstrainRotation(BoneChain fk, float rotation)
{
ActorBone bone = fk.m_Bone;
Mat2D parentWorld = bone.Parent.WorldTransform;
Mat2D transform = bone.Transform;
TransformComponents c = fk.m_TransformComponents;
if (rotation == 0.0f)
{
Mat2D.Identity(transform);
}
else
{
Mat2D.FromRotation(transform, rotation);
}
// Translate
transform[4] = c.X;
transform[5] = c.Y;
// Scale
float scaleX = c.ScaleX;
float scaleY = c.ScaleY;
transform[0] *= scaleX;
transform[1] *= scaleX;
transform[2] *= scaleY;
transform[3] *= scaleY;
// Skew
float skew = c.Skew;
if (skew != 0.0)
{
transform[2] = transform[0] * skew + transform[2];
transform[3] = transform[1] * skew + transform[3];
}
Mat2D.Multiply(bone.WorldTransform, parentWorld, transform);
}