void ApplyBone(BoneWeight bw, Vector2 sourceVector, ref Vector2 resultVector, ref float overallWeight)
{
if (items != null && bw.Index > 0 && bw.Index < items.Length)
{
BoneArray.Entry e = items[bw.Index];
resultVector += bw.Weight * e.RelativeTransform.TransformVector(sourceVector);
overallWeight += bw.Weight;
}
}
public Matrix32 CalcLocalToParentWidgetTransform()
{
if (BaseIndex == 0)
{
return(Matrix32.Identity);
}
BoneArray.Entry b = Parent.AsWidget.BoneArray[BaseIndex];
var l = ClipAboutZero(b.Length);
Vector2 u = b.Tip - b.Joint;
Vector2 v = new Vector2(-u.Y / l, u.X / l);
return(new Matrix32(u, v, b.Tip));
}
public override void Update(float delta)
{
base.Update(delta);
if (Index > 0 && Parent != null)
{
BoneArray.Entry e;
e.Joint = Position;
e.Rotation = Rotation;
e.Length = Length;
if (BaseIndex > 0)
{
// Tie the bone to the parent bone.
BoneArray.Entry b = Parent.AsWidget.BoneArray[BaseIndex];
float l = ClipAboutZero(b.Length);
Vector2 u = b.Tip - b.Joint;
Vector2 v = new Vector2(-u.Y / l, u.X / l);
e.Joint = b.Tip + u * Position.X + v * Position.Y;
e.Rotation += b.Rotation;
}
// Get position of bone's tip.
e.Tip = Vector2.RotateDegRough(new Vector2(e.Length, 0), e.Rotation) + e.Joint;
if (RefLength != 0)
{
float relativeScaling = Length / ClipAboutZero(RefLength);
// Calculating the matrix of relative transformation.
Matrix32 m1, m2;
m1 = Matrix32.TransformationRough(Vector2.Zero, Vector2.One, RefRotation * Mathf.DegToRad, RefPosition);
m2 = Matrix32.TransformationRough(Vector2.Zero, new Vector2(relativeScaling, 1), e.Rotation * Mathf.DegToRad, e.Joint);
e.RelativeTransform = m1.CalcInversed() * m2;
}
else
{
e.RelativeTransform = Matrix32.Identity;
}
Parent.AsWidget.BoneArray[Index] = e;
Parent.PropagateDirtyFlags(DirtyFlags.GlobalTransform);
for (var child = Parent.FirstChild; child != null; child = child.NextSibling)
{
child.DirtyMask |= DirtyFlags.LocalTransform | DirtyFlags.ParentBoundingRect;
}
}
}